Electric motor control system, series hybrid vehicle, electric motor control apparatus, and electric motor control method
First Claim
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1. An electric motor control system comprising:
- a generator;
an AC motor;
a power converter for driving said AC motor using a DC voltage output from said generator; and
an electric motor controller for controlling said power converter,wherein said motor controller estimates a magnetic flux including a magnetic flux axis component by using a DC voltage predicted value predicting a change in said DC voltage, determines a current command based on a torque command and said estimated magnetic flux, and controls said power converter based on said current command.
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Abstract
An electric motor control system including a generator, an AC motor, a power converter for driving the AC motor using a DC output voltage of the generator, and an electric motor controller for controlling the power converter. The electric motor controller controls the power converter by predicting a change in the DC voltage.
59 Citations
27 Claims
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1. An electric motor control system comprising:
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a generator; an AC motor; a power converter for driving said AC motor using a DC voltage output from said generator; and an electric motor controller for controlling said power converter, wherein said motor controller estimates a magnetic flux including a magnetic flux axis component by using a DC voltage predicted value predicting a change in said DC voltage, determines a current command based on a torque command and said estimated magnetic flux, and controls said power converter based on said current command. - View Dependent Claims (2, 3, 4, 5, 6, 7, 11, 12, 13, 18)
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8. A series hybrid vehicle comprising:
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a generator; an AC motor; a power converter for driving said AC motor using a DC voltage output from said generator; an electric motor controller for controlling said power converter; and an engine for driving said generator, wherein said DC voltage depends on a speed of said engine, and said electric motor controller estimates a magnetic flux including a magnetic flux axis component by using a DC voltage predicted value predicting a change in said DC voltage, determines a current command based on a torque command and said estimated magnetic flux, and controls said power converter based on said current command. - View Dependent Claims (9, 10)
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- 14. An electric motor control apparatus for controlling a pulse width of an AC voltage applied to an AC motor, wherein said apparatus estimates a magnetic flux including a magnetic flux axis component by using a DC voltage predicted value predicting a change in said DC voltage for regulating the amplitude of said AC voltage applied to said AC motor, determines a current command based on a torque command and said estimated magnetic flux, and controls said pulse width based on said current command.
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21. An electric motor control system comprising:
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an AC motor; a power converter for driving said AC motor using a DC voltage; and an electric motor controller for performing pulse width control over said power converter, wherein said electric controller estimates a magnetic flux including a magnetic flux axis component by using a DC voltage predicted value predicting a change in said DC voltage, determines a current command based on a torque command and said estimated magnetic flux, and controls said power converter based on said current command. - View Dependent Claims (22)
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23. An electric motor control method for controlling an electric motor controller which performs pulse width control over an AC voltage applied to an AC motor, wherein
said pulse width control is carried out by estimating a magnetic flux including a magnetic flux axis component by using a DC voltage predicted value predicting a change in said DC voltage, determining a current command based on a torque command and said estimated magnetic flux, and controlling said power converter based on said current command.
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25. An electric motor control system for performing pulse width control over an AC voltage applied to an AC motor, wherein
said electric motor control system performs dq vector control by resolving a current of said AC motor into a magnetic flux axis component and a torque axis component electrically perpendicular to said magnetic flux axis component, said AC motor is an induction motor, and said electric motor control system further comprises: -
a first-order lag element filter having a response time constant of an excitation magnetic flux of said induction motor for receiving a magnetic flux command calculated based on a DC voltage value; a torque current converter for calculating said torque axis component of said motor current on the basis of an output signal of said first-order lag element filter and a torque command value; and a slip frequency command calculator for calculating a slip frequency of said induction motor on the basis of the output signal of said first-order lag element filter and a q-axis current command value.
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26. A series hybrid vehicle including an electric motor controller for performing pulse width control over an AC voltage applied to an AC motor, wherein
said electric motor controller performs dq vector control by resolving a current of said AC motor into a magnetic flux axis component and a torque axis component electrically perpendicular to said magnetic flux axis component, said AC motor is an induction motor, and said electric motor control system further comprises: -
a first-order lag element filter having a response time constant of an excitation magnetic flux of said induction motor for receiving a magnetic flux command calculated based on a DC voltage value; a torque current converter for calculating said torque axis component of said motor current on the basis of an output signal of said first-order lag element filter and a torque command value; and a slip frequency command calculator for calculating a slip frequency of said induction motor on the basis of the output signal of said first-order lag element filter and a q-axis current command value.
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27. An electric motor control apparatus for performing pulse width control over an AC voltage applied to an AC motor, wherein
said AC motor is an induction motor, and said apparatus further comprises: -
a first-order lag element filter having a response time constant of an excitation magnetic flux of aid induction motor for receiving a magnetic flux command calculated based on a DC voltage value; a torque current converter for calculating a torque axis component of a motor current on the basis of an output signal of said first-order lag element filter and a torque command value; and a slip frequency command calculator for calculating a slip frequency of said induction motor on the basis of the output signal of said first-order lag element filter and a q-axis current command value.
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Specification