Phase current detection method, inverter control method, motor control method and apparatus for carrying out these methods
First Claim
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1. A phase current detection method for driving a motor by supplying outputs from a PWM inverter to the motor, comprising:
- detecting a DC link current and a vector pattern;
determining whether a voltage vector length exceeds a predetermined value;
adjusting the voltage vector by varying a pulse application interval based upon the determining.
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Abstract
Apparatus and methods for phase current detection used for driving a motor by supplying outputs from a pulse width modulation (PWM) converter to the motor. One method presented provides detecting a DC link current and a vector pattern, determining whether a voltage vector lengths exceeds a predetermined value, and adjusting the voltage vector by adding a positive or reversed voltage based upon the above determination and an integrated error value.
43 Citations
15 Claims
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1. A phase current detection method for driving a motor by supplying outputs from a PWM inverter to the motor, comprising:
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detecting a DC link current and a vector pattern;
determining whether a voltage vector length exceeds a predetermined value;
adjusting the voltage vector by varying a pulse application interval based upon the determining.
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2. A phase current detection method for driving a motor by supplying outputs from a PWM inverter to the motor, comprising:
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detecting a DC link current;
calculating a current pattern;
determining whether current detection is possible during a dead time; and
carrying out current detection in response to the determining representing that current detection is possible.
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3. A phase current detection method for driving a motor by supplying outputs from a PWM inverter to the motor, comprising:
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detecting a DC link current and a vector pattern;
determining whether a voltage vector length exceeds a predetermined threshold; and
calculating an estimated current from the past current values based upon the determining.
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4. A phase current detection method for driving a motor by supplying outputs from a PWM inverter to the motor, comprising:
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detecting a DC link current and a vector pattern;
correcting the current detection value using a prior current estimation value; and
estimating a new current value at a desired timing using the corrected current detection value.
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6. An inverter control method for driving a motor by supplying outputs from a PWM inverter to the motor, comprising:
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performing one of current controlling and position-sensorless controlling, further comprising;
detecting a DC link current and a current command; and
carrying out the controlling using the current measurement values at two current measurement timings within a carrier interval.
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7. An inverter control apparatus is for driving a motor by supplying outputs from a PWM inverter to the motor, comprising:
a position-sensorless controller which uses current measurement values at two current measurement timings within a carrier interval.
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8. A phase current detection method for driving a motor by supplying outputs from a PWM inverter to the motor, comprising:
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estimating direction of a phase current at a current detection timing, and varying a minimum pulse width based upon the estimation result. - View Dependent Claims (5, 9)
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10. A motor controlling method, comprising:
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calculating a motor voltage from a DC link voltage and a gate pulse width;
detecting a phase current from a DC link current and a vector pattern; and
controlling the DC link voltage based upon the motor voltage required by the motor. - View Dependent Claims (11)
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12. A phase current detection method, comprising:
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calculating a phase current from a current of a DC link and vector pattern;
connecting a converter for carrying out switching operation to the PWM inverter in series; and
prohibiting switching of the converter and the PWM inverter at a current detection timing. - View Dependent Claims (13)
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14. A motor controlling apparatus for driving a motor by supplying outputs from a PWM inverter to the motor comprising:
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a current detection section for determining a DC link current; and
a DC link voltage controlling section, associated with the current detection section, which varies the DC link voltage based upon a voltage required by a motor. - View Dependent Claims (15)
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Specification