Motor control device and current detecting unit
First Claim
1. A motor control device comprising a current detecting portion that detects, as detection current, current flowing between a DC power supply outputting a DC voltage and an inverter to which the DC voltage is applied and that drives a three-phase motor, the motor control device detecting motor current flowing in the motor from the detection current and controlling the motor via the inverter based on the motor current, the motor control device further comprising:
- a specified voltage vector generating portion that generates a specified voltage vector indicating a voltage vector that an applied voltage to the motor should follow based on the motor current; and
a specified voltage vector correcting portion that corrects the generated specified voltage vector, whereinthe motor control device controls the motor in accordance with the specified voltage vector after the correction, andwherein the specified voltage vector correcting portion corrects the generated specified voltage vector so that the specified voltage vector after the correction becomes a vector outside a region where the motor current cannot be detected.
1 Assignment
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Accused Products
Abstract
A current detecting unit detects three phase current of a three-phase inverter from current flowing between the inverter and a DC power supply. The current detecting unit includes a specified voltage vector generating portion that generates a specified voltage vector indicating a voltage vector that three-phase voltage of the inverter should follow, and a specified voltage vector correcting portion that corrects the generated specified voltage vector. The inverter is controlled in accordance with the specified voltage vector after the correction.
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Citations
16 Claims
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1. A motor control device comprising a current detecting portion that detects, as detection current, current flowing between a DC power supply outputting a DC voltage and an inverter to which the DC voltage is applied and that drives a three-phase motor, the motor control device detecting motor current flowing in the motor from the detection current and controlling the motor via the inverter based on the motor current, the motor control device further comprising:
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a specified voltage vector generating portion that generates a specified voltage vector indicating a voltage vector that an applied voltage to the motor should follow based on the motor current; and a specified voltage vector correcting portion that corrects the generated specified voltage vector, wherein the motor control device controls the motor in accordance with the specified voltage vector after the correction, and wherein the specified voltage vector correcting portion corrects the generated specified voltage vector so that the specified voltage vector after the correction becomes a vector outside a region where the motor current cannot be detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A current detecting unit comprising a current detecting portion that detects, as detection current, current flowing between a DC power supply outputting a DC voltage and a three-phase inverter to which the DC voltage is applied, the current detecting unit detecting three phase current of the inverter from the detection current, the current detecting unit further comprising:
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a specified voltage vector generating portion that generates a specified voltage vector indicating a voltage vector that three-phase voltages of the inverter should follow; and a specified voltage vector correcting portion that corrects the generated specified voltage vector, so that the inverter is controlled in accordance with the specified voltage vector after the correction, wherein the specified voltage vector correcting portion corrects the generated specified voltage vector so that the specified voltage vector after the correction becomes a vector outside a region where current values of two phases of the three phase current cannot be detected. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification