MOTOR DRIVING DEVICE INCLUDING ELECTRIC STORAGE DEVICE
First Claim
1. A motor driving device comprising:
- a rectifier that rectifies alternating current power supplied from an alternating current side to output direct current power;
an inverter that is connected to a direct current link on a direct current side of the rectifier and that mutually transforms electric power between direct current power at the direct current link and alternating current power that is driving electric power for a motor or electric power regenerated in the motor;
a power failure detecting unit for detecting a power failure on the alternating current side of the rectifier;
an electric storage device that is connected to the direct current link and that includes a capacity for storing direct current power;
a charging unit that possesses a voltage boosting function of charging the electric storage device to a voltage higher than a direct current voltage at the direct current link;
a discharging unit for making a short-circuit between the electric storage device and the direct current link to cause direct current power stored in the electric storage device to be discharged to the direct current link; and
a control unit that outputs a charging command for causing the charging unit to operate when the power failure detecting unit does not detect a power failure on the alternating side of the rectifier, or before drive of the motor is started, and outputs a discharging command for causing the discharging unit to operate and a predetermined motor driving command for causing the inverter to operate when the power failure detecting unit detects a power failure on the alternating side of the rectifier.
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Accused Products
Abstract
A motor driving device includes a rectifier, an inverter connected to a DC link on a DC side of the rectifier, a power failure detecting unit for detecting a power failure on the alternating side of the rectifier, an electric storage device connected to the DC link, a charging unit that possesses a voltage boosting function of charging the electric storage device by direct current power at the DC link, a discharging unit that causes direct current power stored in the electric storage device to be discharged to the DC link, and a control unit that causes the charging unit to operate when the power failure detecting unit does not detect a power failure, or before start of motor drive, and causes the discharging unit and the inverter to operate when the power failure detecting unit detects a power failure.
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Citations
3 Claims
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1. A motor driving device comprising:
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a rectifier that rectifies alternating current power supplied from an alternating current side to output direct current power; an inverter that is connected to a direct current link on a direct current side of the rectifier and that mutually transforms electric power between direct current power at the direct current link and alternating current power that is driving electric power for a motor or electric power regenerated in the motor; a power failure detecting unit for detecting a power failure on the alternating current side of the rectifier; an electric storage device that is connected to the direct current link and that includes a capacity for storing direct current power; a charging unit that possesses a voltage boosting function of charging the electric storage device to a voltage higher than a direct current voltage at the direct current link; a discharging unit for making a short-circuit between the electric storage device and the direct current link to cause direct current power stored in the electric storage device to be discharged to the direct current link; and a control unit that outputs a charging command for causing the charging unit to operate when the power failure detecting unit does not detect a power failure on the alternating side of the rectifier, or before drive of the motor is started, and outputs a discharging command for causing the discharging unit to operate and a predetermined motor driving command for causing the inverter to operate when the power failure detecting unit detects a power failure on the alternating side of the rectifier. - View Dependent Claims (2, 3)
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Specification