US11711041B2 - Motor drive system comprising power network between inverter and motor - Google Patents
Motor drive system comprising power network between inverter and motor Download PDFInfo
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- US11711041B2 US11711041B2 US17/057,588 US201917057588A US11711041B2 US 11711041 B2 US11711041 B2 US 11711041B2 US 201917057588 A US201917057588 A US 201917057588A US 11711041 B2 US11711041 B2 US 11711041B2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/0094—Structural association with other electrical or electronic devices
Definitions
- This disclosure relates to a motor driving system, and more particularly, a motor driving system having a power network circuit configured with a passive element between an inverter and a motor.
- FIG. 1 shows an equivalent per-phase circuit with a three-phase structure of a general motor.
- an output voltage v1 and a counter electromotive force voltage v2 of an inverter are shown as input and output voltages, and the phase impedance is shown as a series combination of an inductor and a resistor.
- v2 is the counter electromotive force voltage, and its size is generally proportional to speed.
- the output voltage v1 of the inverter is limited (Vdc/ ⁇ 3 in the case of PWM, 2Vdc/ ⁇ in the case of Six-step), so the maximum operating area is limited when considering the inductor, the resistance voltage drop and the counter electromotive force.
- FIG. 2 shows a torque-speed curve of a conventional motor.
- a maximum speed at which a constant torque is maintained as marked in green is referred to as a base speed, and this speed is determined by the limit of the voltage size mentioned above. In other words, if the DC-link voltage increases and thus the maximum value of v1 increases, the base speed increases.
- FIGS. 3 A and 3 B show conventional methods for raising an output voltage to increase the bases peed.
- FIG. 3 A is a boost converter method
- FIG. 3 B is a z-source inverter method.
- the output voltage is limited according to the size of a DC-link voltage, so a boost converter is used to increase the DC-link voltage.
- the DC-link voltage may be increased to a range in which the boost converter within a device rating is controllable. Therefore, there is an advantage that the maximum output voltage of the inverter can be improved, but there is a disadvantage that the volume and switching loss increase due to additional inductor and switch.
- the DC-link voltage increases, the voltage stress of a switching element increases, and an insulation interval or the like of the driving circuit should be considered again. Therefore, it is necessary to redesign the driving circuit by element selection and artwork.
- a Z-source inverter is used to boost the DC-link voltage with only a passive element without using a boost converter.
- this method by adding a shoot-through time of an inverter leg (the time to turn on both upper and lower switches), the energy transfer process performed by the boost converter is performed by the inverter itself.
- the inverter output is limited by the shoot-through time, there is a problem that the inverter cannot use the voltage to its maximum.
- the driving circuit needs to be redesigned because the voltage stress increases like the boost converter.
- Non-patent Literature 1 P. Fang Zheng, “Z-source inverter,” IEEE Transactions on Industry Applications, vol. 39, no. 2, pp. 504-510, 2003
- a motor driving system having a power network between an inverter and a motor comprises an AC motor, an inverter unit configured to apply a voltage to the AC motor, a controller configured to control an output voltage of the inverter unit, and a power network circuit disposed between the inverter unit and the AC motor, wherein the power network circuit may be configured with passive element.
- the power network circuit may be configured as a T-type impedance model.
- the power network circuit may be configured with at least one of:
- a capacitor connected in series to the AC motor a capacitor connected in series to the AC motor and an inductor connected in parallel thereto; an inductor connected in parallel to the AC motor and a capacitor connected in series thereto; a capacitor and an inductor in series to the AC motor and an inductor connected in parallel thereto; a capacitor and an inductor in series to the AC motor and a capacitor connected in parallel thereto; an inductor connected in series to the AC motor and an inductor and a capacitor connected in parallel thereto; and a capacitor connected in series to the AC motor and an inductor and a capacitor connected in parallel thereto.
- the power network circuit may further include a mechanical or electric switch, and the mechanical or electric switch may be turned off in a first mode in which the AC motor is operating at a speed less than a predetermined speed and be turned on in a second mode in which the AC motor is operating at a speed equal to or greater than the predetermined speed.
- a value of the capacitor may be determined based on an inductance of the AC motor, a magnetic flux density of a permanent magnet of the AC motor and a maximum voltage of the inverter unit.
- the power network circuit may be configured with at least one of a capacitor and an inductor
- the T-type impedance model may include a first impedance and a second impedance connected in series to the AC motor; and a third impedance extending from a node between the first impedance and the second impedance and connected in parallel to the first impedance and the second impedance, and the first impedance, the second impedance and the third impedance may be expressed as follows.
- values of the capacitor and the inductor configuring the power network circuit may be determined such that a following formula satisfies 0.
- r m is an equivalent resistance of the AC motor.
- the AC motor may be at least one selected from a surface-mounted permanent magnet motor, an induction motor and an interior permanent magnet synchronous motor.
- a value of the impedance configuring the power network circuit may be selected to minimize the sum of a size of the power network circuit and a size of the inverter unit.
- the size of the power network circuit may be the sum of maximum values of reactive powers of all passive elements included in the power network circuit.
- a method of designing a motor driving system having a power network between an inverter and a motor including: an AC motor; an inverter unit configured to apply a voltage to the AC motor; a controller configured to control an output voltage of the inverter unit; and a power network circuit disposed between the inverter unit and the AC motor, wherein the power network circuit is configured with a passive element and configured as a T-type impedance model.
- a value of the capacitor may be determined based on an inductance of the AC motor, a magnetic flux density of a permanent magnet of the AC motor and a maximum voltage of the inverter unit.
- the T-type impedance model may include a first impedance and a second impedance connected in series to the AC motor; and a third impedance extending from a node between the first impedance and the second impedance and connected in parallel to the first impedance and the second impedance, and the first impedance, the second impedance and the third impedance may be expressed as follows.
- a value of the impedance configuring the power network circuit may be determined such that a following formula satisfies 0.
- r m may be an equivalent resistance of the AC motor.
- a value of the impedance configuring the power network circuit may be selected to minimize the sum of a size of the power network circuit and a size of the inverter unit.
- the size of the power network circuit may be the sum of maximum values of reactive powers of all passive elements included in the power network circuit.
- the maximum output of the corresponding motor is improved under the same voltage and current limit conditions.
- the power network circuit may be applied to an induction motor (IM), a surface-mounted permanent magnet synchronous motor (SPM) and an interior permanent magnet synchronous motor (IPM), and improved output has been confirmed.
- IM induction motor
- SPM surface-mounted permanent magnet synchronous motor
- IPM interior permanent magnet synchronous motor
- the passive element included in the power network circuit may be configured in various ways, but in this specification, for the sake of simplicity of explanation, the effect will be explained about the case where capacitors are connected in series, the case where two elements of LC or CL are used, and the case where three elements such as LCC are used.
- FIG. 1 shows an equivalent per-phase circuit with a three-phase structure of a general motor.
- FIG. 2 shows a torque-speed curve of a conventional motor.
- FIGS. 3 A and 3 B show conventional methods for raising an output voltage to increase a driving speed.
- FIG. 4 shows a motor driving system 1000 having a power network between an inverter and a motor according to an embodiment of the present disclosure.
- FIG. 5 shows a per-phase impedance structure model of a power network circuit 130 according to an embodiment of the present disclosure.
- FIG. 6 shows a case where an induction motor is used as an AC motor 110 according to an embodiment of the present disclosure and the power network circuit 130 is configured with a capacitor connected in series to the AC motor.
- FIGS. 7 A and 7 B show a speed-torque curve ( FIG. 7 A ) and a speed-output power curve ( FIG. 7 B ) according to a capacitor value of the circuit of FIG. 6 .
- FIG. 8 shows a case where a surface-mounted permanent magnet synchronous motor is used as the AC motor 110 according to an embodiment of the present disclosure and the power network circuit 130 is configured with a capacitor connected in series to the AC motor.
- FIGS. 9 A and 9 B show a speed-torque curve ( FIG. 9 A ) and a speed-output power curve ( FIG. 9 B ) according to a capacitor value of the circuit of FIG. 8 .
- FIG. 10 shows a case where an interior permanent magnet synchronous motor is used as the AC motor 110 according to an embodiment of the present disclosure and the power network circuit 130 is configured with a capacitor connected in series to the AC motor.
- FIGS. 11 A and 11 B show a speed-torque curve ( FIG. 11 A ) and a speed-output power curve ( FIG. 11 B ) according to a capacitor value of the circuit of FIG. 10 .
- FIG. 12 shows a case where a surface-mounted permanent magnet synchronous motor is used as the AC motor 110 according to an embodiment of the present disclosure and the power network circuit 130 is configured with a capacitor 131 connected in series to the AC motor and an inductor 132 connected in parallel thereto.
- FIGS. 13 A and FIG. 13 B show a speed-torque curve ( FIG. 13 A ) and a speed-output power curve ( FIG. 13 B ) according to a ratio of the capacitor and the inductor in the circuit of FIG. 12 .
- FIG. 14 shows a case where a surface-mounted permanent magnet synchronous motor is used as the AC motor 110 according to an embodiment of the present disclosure and the power network circuit 130 is configured with an inductor 133 connected in series to the AC motor and a capacitor 134 connected in parallel thereto.
- FIGS. 15 A and 15 B show a speed-torque curve ( FIG. 15 A ) and a speed-output power curve ( FIG. 15 B ) according to a ratio of the capacitor and the inductor in the circuit of FIG. 14 .
- FIG. 16 show a speed-torque relationship of the induction motor.
- FIG. 17 show a per-phase equivalent circuit when a surface-mounted permanent magnet synchronous motor (SPM) is used as the AC motor.
- SPM surface-mounted permanent magnet synchronous motor
- FIG. 18 shows the change of ratio of an output current (I2) according to impedance X12 and a current (I12) flowing to a middle impedance X12 of a T-type equivalent model.
- FIGS. 19 A and 19 B show a power network circuit 130 configured with a per-phase CL, LC.
- FIGS. 20 A and 20 B show a capability curve when the power network circuit 130 is configured with an LCC in an embodiment.
- a block dotted line represents a case where the power network circuit 130 is not provided.
- FIG. 4 shows a motor driving system 100 having a power network between an inverter and a motor according to an embodiment of the present disclosure.
- the motor driving system 100 including a power network between an inverter and a motor includes an AC motor 110 , an inverter unit 120 for applying a voltage to the AC motor 110 , a controller 140 for controlling an output voltage of the inverter unit 120 , and a power network circuit 130 disposed between the inverter unit 120 and the AC motor 110 .
- the power network circuit 130 may be configured with a passive element, and preferably may be composed only of a capacitor, an inductor, or a combination thereof. That is, the power network circuit 130 may be a lossless system having only ineffective components.
- a voltage source 150 for supplying a DC voltage to the inductor unit 120 may be further included.
- the controller 140 plays a role of controlling the output voltage of the inverter unit 120 .
- the controller 100 may include at least one of a current command generator, a weak magnetic flux controller, a current controller, a voltage controller, a step voltage generator, a compensation voltage generator, a PWM unit, and a coordinate converter, but is not limited thereto.
- the controller 140 needs current and angle information to control the output voltage of the inverter unit.
- the controller 140 may obtain a current value through a sensor mounted at an output terminal of the motor 110 or recover a phase current from a 3 or 1 shunt resistance of a leg.
- the angle information may be read through an additional device such as a Hall sensor or a resolver, or the angle information may be electrically estimated through a sensorless method or the like, but the present disclosure is not limited thereto.
- FIG. 4 shows a three-phase motor and a three-phase inverter, but the motor driving system 100 of the present disclosure is not limited to the three-phase circuit, but may also be applied to a single-phase or other multi-phase (five-phase, six-phase, seven-phase, or the like) circuit.
- the AC motor 110 may be at least one selected from an induction motor (IM), a surface-mounted permanent magnet synchronous motor (SPM), and an interior permanent magnet synchronous motor (IPM), but is not limited thereto, and any type of AC motor is included therein.
- IM induction motor
- SPM surface-mounted permanent magnet synchronous motor
- IPM interior permanent magnet synchronous motor
- FIG. 5 shows a per-phase impedance structure model of a power network circuit 130 according to an embodiment of the present disclosure.
- FIG. 5 shows a circuit diagram in which the power network circuit 130 is inserted between the inverter unit 120 and the AC motor 120 in an equivalent per-phase circuit of FIG. 1 .
- the power network circuit 130 may be configured as a T-type impedance model, and the input and output characteristics of the power network circuit 130 may be determined by appropriately adjusting X11, X12 and X22 values. That is, the power network circuit 130 may be configured by determining the value of the passive element corresponding to X11, X12, and X22.
- the power network circuit 130 may be configured as follows, but is not limited thereto.
- each capacitor and inductor when connecting a capacitor and an inductor, the values of each capacitor and inductor may be determined in various ways depending on the type of the AC motor. For example, if the power network circuit 130 is configured with capacitors connected in series, X12 becomes 0.
- FIG. 6 shows a case where an induction motor is used as an AC motor 110 according to an embodiment of the present disclosure and the power network circuit 130 is configured with a capacitor connected in series to the AC motor.
- FIGS. 7 A and 7 B show a speed-torque curve ( FIG. 7 A ) and a speed-output power curve ( FIG. 7 B ) according to a capacitor value of the circuit of FIG. 6 .
- FIGS. 7 A and 7 B it may be understood that the maximum output power at a specific speed is increased compared to the case where there is no capacitor (without cap).
- FIG. 8 shows a case where a surface-mounted permanent magnet synchronous motor is used as the AC motor 110 according to an embodiment of the present disclosure and the power network circuit 130 is configured with a capacitor connected in series to the AC motor.
- FIGS. 9 A and 9 B show a speed-torque curve ( FIG. 9 A ) and a speed-output power curve ( FIG. 9 B ) according to a capacitor value of the circuit of FIG. 8 .
- FIGS. 9 A and 9 B it may be understood that the speed for outputting the maximum power is increased compared to the case where there is no capacitor (without cap).
- FIG. 10 shows a case where an interior permanent magnet synchronous motor is used as the AC motor 110 according to an embodiment of the present disclosure and the power network circuit 130 is configured with a capacitor connected in series to the AC motor.
- FIGS. 11 A and 11 B show a speed-torque curve ( FIG. 11 A ) and a speed-output power curve ( FIG. 11 B ) according to a capacitor value of the circuit of FIG. 10 .
- FIGS. 11 A and 11 B it may be understood that even in this case, the maximum output power at a specific speed is increased compared to the case where there is no capacitor (without cap).
- FIG. 12 shows a case where a surface-mounted permanent magnet synchronous motor is used as the AC motor 110 according to an embodiment of the present disclosure and the power network circuit 130 is configured with a capacitor 131 connected in series to the AC motor and an inductor 132 connected in parallel thereto.
- FIGS. 13 A and FIG. 13 B show a speed-torque curve ( FIG. 13 A ) and a speed-output power curve ( FIG. 13 B ) according to a current limit value of the inverter unit in the circuit of FIG. 12 .
- FIGS. 13 A and FIG. 13 B show a capability curve according to the output current at the inverter unit in a state in which the output voltage at the inverter unit 120 is limited and the current input to the AC motor 110 is limited, and LC connected in series and parallel are connected thereto, so it may be understood that the AC motor 110 may show higher output power than the case where there is no LC (a black dotted line). Since optimization is not made in the two degrees of freedom, a large current is needed at the output terminal of the inverter.
- FIG. 14 shows a case where a surface-mounted permanent magnet synchronous motor is used as the AC motor 110 according to an embodiment of the present disclosure and the power network circuit 130 is configured with an inductor 133 connected in series to the AC motor and a capacitor 134 connected in parallel thereto.
- FIGS. 15 A and 15 B show a speed-torque curve ( FIG. 15 A ) and a speed-output power curve ( FIG. 15 B ) according to a current limit value of the inverter unit in the circuit of FIG. 14 .
- FIGS. 15 A and 15 B show a capability curve according to the output current at the inverter unit in a state where the output voltage at the inverter unit 120 is limited and the current input to the AC motor 110 is limited, and LC connected in series and parallel are applied thereto, so it may be understood that the AC motor 110 may show higher output power than the case where there is no LC (a black dotted line). Since optimization is not made in the two degrees of freedom, a large current is needed at the output terminal of the inverter.
- Formula 1 may be determined as below. Since the surface-mounted permanent magnet motor has a perfectly symmetrical structure and the rotation frequency is fixed as a synchronous frequency, the capacitor value may be determined simply as in Formula 1.
- C s ⁇ _ ⁇ SPM I s ⁇ _ ⁇ rated ⁇ ( I s ⁇ _ ⁇ rated ⁇ L s ⁇ ⁇ r ⁇ _ ⁇ target - ⁇ f 2 ⁇ ⁇ r ⁇ _ ⁇ target 2 - V max 2 ) I s ⁇ _ ⁇ rated 2 ⁇ L s 2 ⁇ ⁇ r ⁇ _ ⁇ target 3 - ⁇ f 2 ⁇ ⁇ r ⁇ _ ⁇ target 3 + V max 2 ⁇ ⁇ r ⁇ _ ⁇ target [ Formula ⁇ ⁇ 1 ]
- Ls represents an inductance of the motor
- ⁇ represents a magnetic flux density of the permanent magnet
- Vmax represents a maximum voltage of the inverter unit
- Is_rated represents a current limit value of the motor.
- the value of the capacitor may be determined based on the inductance of the AC motor, the magnetic flux density of the permanent magnet of the AC motor, and the maximum voltage of the inverter unit.
- the value of the capacitor connected in series may be designed by determining the maximum torque in a stop state and the maximum speed for outputting a rated torque as shown in FIG. 16 .
- the maximum and minimum values of the capacitor value connected in series may be determined according to Formula 2 below, and in Formula 3, the value of the capacitor may be determined as a value between the maximum and minimum values determined in Formula 2.
- Ls is an inductance of the motor.
- Rr is a resistance of the rotor and Rs is a resistance of the stator.
- ⁇ is a leakage coefficient of the motor.
- ⁇ e_rated is a rated electric speed of the motor.
- ⁇ r_rated is a rated speed of the motor rotor.
- Vs_max is a synthesizable voltage limit.
- ⁇ r_rated is a rated magnetic flux of the motor. Idqs0, e0 is a current for generating the corresponding torque Tmax0 at 0 speed. C min ( T max0 ) ⁇ C s ⁇ C max ( ⁇ r_rated ) [Formula 3]
- FIG. 17 shows a per-phase equivalent circuit when the surface-mounted permanent magnet synchronous motor (SPM) is used as the AC motor.
- the power network circuit 130 may be configured as a T-type impedance model, and the input and output characteristics of the power network circuit 130 may be determined by appropriately adjusting the X11, X12, and X22 values.
- the power network circuit is configured with at least one of a capacitor and an inductor
- the T-type impedance model may be configured with a first impedance and a second impedance connected in series to the AC motor, and a third impedance extending from a node between the first impedance and the second impedance and connected in parallel to the first impedance and the second impedance.
- the first impedance, the second impedance and the third impedance may be expressed as follows.
- the counter electromotive force of the motor may be replaced with a resistance. If the output voltage v1 of the inverter unit and the counter electromotive force voltage v2 of the surface-mounted permanent magnet synchronous motor (SPM) may be expressed as a per-phase equivalent circuit, as shown in FIG. 17 .
- the right impedance (jX22-jX12) of the T-model is a value including the resistance of the motor and the inductance value.
- rm of the per-phase equivalent circuit (the equivalent resistance of the motor) may be determined as in Formula 4 according to the output speed and power of the motor.
- ⁇ f a magnetic flux density of the permanent magnet
- wr the speed
- Pm an output power of the motor
- two degrees of freedom are used among three impedances (X11, X12, X22). Additional optimization is possible through the remaining 1 degree of freedom.
- An optimization method using the remaining one degree of freedom may minimize the current flowing through the center impedance (X12). Through this, it is possible to minimize the output current of the inverter by reducing the current that does not contribute to the output power.
- X11, X12 and X22 may be determined so that the imaginary part becomes 0 in Formula 5.
- FIG. 18 shows the change of ratio of an output current (I2) according to impedance X12 and a current (I12) flowing to a middle impedance X12 of a T-type equivalent model.
- a required X12 value may be determined by referring to the graph of FIG. 18 .
- FIGS. 19 A and 19 B show a power network circuit 130 configured with a per-phase CL, LC.
- FIG. 19 A shows a power network circuit 130 a 1 configured with a capacitor connected in series and an inductor connected in parallel
- FIG. 19 B shows a power network circuit 130 a 2 configured with an inductor connected in series and a capacitor connected in parallel.
- the power network circuit is designed so that the imaginary part becomes 0 through Formula 5, the power factor of the inverter becomes 1, thereby minimizing the power loss of the inverter.
- the power network circuit may be designed so that the imaginary part does not become 0.
- minimizing the loss of the inverter by designing the power factor of the inverter to be 1 may not minimize the size (or, power loss) of the entire system.
- the size (or, power loss) of the entire system it would be more advantageous to obtain a gain in terms of power loss in other parts of the system (for example, the power network circuit) even though the power loss of the inverter is somewhat damaged.
- the inverter loss is decreasing in the latest inverters and its size is also decreasing.
- the ratio of the power loss of the power network circuit is likely to be greater than the power loss of the inverter when the latest inverter is used.
- the power network circuit may be configured to minimize the size (or, power loss) of the entire motor driving system. For example, when the sum of the size (or, power loss) of the power network circuit and the size (or, power loss) of the inverter unit is minimized, the size (or, power loss) of the entire system may be minimized.
- the size of the power network circuit may be expressed as the sum of maximum values of reactive powers of all passive elements.
- a user or designer may design the power network circuit by determining characteristic values of passive elements based on the purpose of the power network circuit applied to the motor driving system, the power ratio of the inverter, the power ratio of the power network circuit, and the like.
- FIGS. 20 A and 20 B show a capability curve when the power network circuit 130 is configured with an LCC in an embodiment.
- the capability curves of FIGS. 20 A and 20 B are drawn by limiting the current of the motor 110 to 1 and changing the current limit at the inverter unit. Since the power factor is designed as 1 at the target speed of 2400 r/m, it may be found that the maximum torque and maximum power are output at the corresponding speed.
- This curve has a similar shape to the series capacitor, but has a higher efficiency than the series capacitor structure because the power factor is designed as 1 at the maximum speed.
- the capacity curve of an existing motor is as shown by a black dotted line.
- the power network circuit 130 may further include a mechanical switch or an electric switch.
- the mechanical or electric switch may be turned off in a first mode in which the AC motor is operating at a speed less than a predetermined speed and turned on in a second mode in which the AC motor is operating at a speed equal to or greater than a predetermined speed. That is, if a speed greater than the predetermined speed is required, the mechanical or electric switch may be controlled to be turned on so that the power network circuit of the present disclosure operates.
- compensating the existing mechanical gear system may be configured in an electrical form, which has an advantage of compensating for the disadvantages such as wear, noise and clutch timing of the existing mechanical gear.
- the motor driving system may include an AC motor, an inverter unit configured to apply a voltage to the AC motor, a controller configured to control an output voltage of the inverter unit, and a power network circuit disposed between the inverter unit and the AC motor, and the power network circuit may be configured with a passive element and configured as a T-type impedance model.
- a value of the capacitor may be determined based on an inductance of the AC motor, a magnetic flux density of a permanent magnet of the AC motor and a maximum voltage of the inverter unit.
- the power network circuit may be configured with at least one of a capacitor and inductor, and the T-type impedance model may include a first impedance and a second impedance connected in series to the AC motor, and
- a third impedance extending from a node between the first impedance and the second impedance and connected in parallel to the first impedance and the second impedance, and the first impedance, the second impedance and the third impedance may expressed as follows.
- values of the capacitor and the inductor configuring the power network circuit may be determined such that a following formula satisfies 0.
- r m is an equivalent resistance of the AC motor.
- the motor driving system having a power network between an inverter and a motor improves the maximum output of the motor.
- the power network circuit is configured to improve the output of various motors such as an induction motor (IM), a surface-mounted permanent magnet synchronous motor (SPM) and an interior permanent magnet synchronous motor (IPM), and may be widely used in the power field.
- IM induction motor
- SPM surface-mounted permanent magnet synchronous motor
- IPM interior permanent magnet synchronous motor
Abstract
Description
-
- 100: motor driving system
- 110: AC motor
- 120: inverter unit
- 130: power network circuit
- 140: controller
- 150: voltage source
C min(T max0)≤C s ≤C max(ωr_rated) [Formula 3]
Claims (6)
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KR1020180058359A KR102157345B1 (en) | 2018-05-23 | 2018-05-23 | Motor driving system having power network circuit disposed between inverter and motor |
PCT/KR2019/001629 WO2019225835A1 (en) | 2018-05-23 | 2019-02-11 | Motor drive system comprising power network between inverter and motor |
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US11711041B2 true US11711041B2 (en) | 2023-07-25 |
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- 2018-05-23 KR KR1020180058359A patent/KR102157345B1/en active IP Right Grant
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US20210194403A1 (en) | 2021-06-24 |
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KR20190133428A (en) | 2019-12-03 |
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