Motor drive apparatus
First Claim
1. A motor drive apparatus comprising:
- a drive circuit driving a motor;
a voltage converter including a switching element and using a switching operation of said switching element for converting a DC voltage between a power supply and said drive circuit;
a capacitor element provided between said voltage converter and said drive circuit for smoothing the converted DC voltage to input the smoothed DC voltage to said drive circuit; and
a control circuit controlling said switching operation based on magnitude of a required output of said motor, whereinsaid drive circuit is supplied with electric power, according to the required output of said motor, from said power supply and from said capacitor element, andsaid control circuit controls said switching operation so that the electric power supplied from said capacitor element to said drive circuit is larger than the electric power supplied from said power supply to said drive circuit when the magnitude of said required output is out of a predetermined variation width.
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Accused Products
Abstract
When a torque command value from an external ECU is within a predetermined variation width, a control unit generates a signal and outputs the signal to a voltage command calculation unit so that electrostatic energy stored in a capacitor is kept at a predetermined threshold value or larger. Based on the signal, the voltage command calculation unit determines a target voltage of a voltage step-up converter that corresponds to a terminal-to-terminal voltage of the capacitor. In contrast, when the torque command value is out of the predetermined variation width, the control unit determines electric power to be supplied from a DC power supply to an inverter for allowing electric power to be supplied predominantly from the capacitor rather than from the DC power supply and outputs a signal. Based on this signal, the voltage command calculation unit determines the target voltage.
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Citations
13 Claims
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1. A motor drive apparatus comprising:
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a drive circuit driving a motor; a voltage converter including a switching element and using a switching operation of said switching element for converting a DC voltage between a power supply and said drive circuit; a capacitor element provided between said voltage converter and said drive circuit for smoothing the converted DC voltage to input the smoothed DC voltage to said drive circuit; and a control circuit controlling said switching operation based on magnitude of a required output of said motor, wherein said drive circuit is supplied with electric power, according to the required output of said motor, from said power supply and from said capacitor element, and said control circuit controls said switching operation so that the electric power supplied from said capacitor element to said drive circuit is larger than the electric power supplied from said power supply to said drive circuit when the magnitude of said required output is out of a predetermined variation width. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification