Phase current detection method, inverter control method, motor control method, and apparatuses used in these methods
First Claim
1. A phase current detection method is a method which detects a phase current of a motor (4) based upon a DC link current and a vector pattern to be applied and which restricts the minimum pulse width, which method is included in a motor driving apparatus for driving a motor (4) by supplying outputs from a PWM inverter (3) to the motor (4), the method comprising the step of:
- adjusting a voltage to be applied by adding positive or reversed voltage in response to a fact that a desired duty has a small value.
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Accused Products
Abstract
The phase current detection apparatus comprises an output time detection section 6a for receiving a voltage vector command as input, and for detecting a voltage vector which should be enlarged its output time, output time enlargement section 6bfor receiving the voltage vector command and the voltage vector detected by the output time detection section 6a as input, and for carrying out enlargement processing for output time (enlarge the output time up to a length allowing the current detector 5 to detect the voltage vector), subtraction section 6c for subtracting the length of actually output voltage vector from the voltage vector command, and for outputting an error, output error integrating section 6d for integrating the error from the subtraction section 6g and for calculating an integrated error of an output with respect to the voltage vector command, reverse vector generation section 6e for outputting a vector (reverse vector) which is obtained by replacing the ON/OFF in Table 1 for the enlarged voltage vector, and selection section 6f for carrying out the replacing operation depending upon the sign of the integrated error from the output error integrating section 6d so as to select the output from the output time enlargement section 6b and the output from the reverse vector generation section 6e . Therefore, decrease in cost, detection of a phase current with stability at a desired timing, and great decrease in distortion in voltage waveform are realized.
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Citations
56 Claims
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1. A phase current detection method is a method which detects a phase current of a motor (4) based upon a DC link current and a vector pattern to be applied and which restricts the minimum pulse width, which method is included in a motor driving apparatus for driving a motor (4) by supplying outputs from a PWM inverter (3) to the motor (4), the method comprising the step of:
adjusting a voltage to be applied by adding positive or reversed voltage in response to a fact that a desired duty has a small value. - View Dependent Claims (4, 5, 6, 7)
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2. A phase current detection method is a method which detects a phase current of a motor (4) based upon a DC link current and a vector pattern to be applied and which restricts the minimum pulse width, which method is included in a motor driving apparatus for driving a motor (4) by supplying outputs from a PWM inverter (3) to the motor (4), the method comprising the step of:
adjusting a voltage to be applied by varying a pulse application interval in response to a fact that a desired duty has a small value.
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3. A phase current detection method is a method which detects a DC link current and calculates a phase current of a motor (4), which method is included in a motor driving apparatus for driving a motor (4) by supplying outputs from a PWM inverter (3) to the motor (4), the method comprising the steps of:
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judging whether or not current detection is possible during the dead time, and carrying out current detection in response to the judgement result representing that current detection is possible.
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8. A phase current detection method is a method which detects a phase current of a motor (4) based upon a DC link current and a vector pattern to be applied, which method is included in a motor driving apparatus for driving a motor (4) by supplying outputs from a PWM inverter (3) to the motor (4), the method comprising the step of:
estimating a current from the past current values in response to the fact that an applied voltage vector is too short to measure the current.
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9. A phase current detection method is a method which detects a phase current of a motor (4) based upon a DC link current and a vector pattern to be applied, which method is included in a motor driving apparatus for driving a motor (4) by supplying outputs from a PWM inverter (3) to the motor (4), the method comprising the step of:
estimating a current value at a desired timing by correcting a current detection value using a current estimation value generated from the past current detection values. - View Dependent Claims (10, 11, 12)
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13. An inverter control method is a method which detects a phase current of a motor (4) based upon a DC link current and a vector pattern to be applied, which method is included in a motor driving apparatus for driving a motor (4) by supplying outputs from a PWM inverter (3) to the motor (4), and which carries out current controlling or position-sensor-less controlling, the method comprising the step of:
carrying out the controlling using the current measurement values at two current measurement timings within a carrier interval.
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14. A phase current detection apparatus is an apparatus which detects a phase current of a motor (4) based upon a DC link current and a vector pattern to be applied and which restricts the minimum pulse width, which apparatus is included in a motor driving apparatus for driving a motor (4) by supplying outputs from a PWM inverter (3) to the motor (4), the apparatus comprising:
adjusting means (6e) for adjusting a voltage to be applied by adding positive or reversed voltage in response to a fact that a desired duty has a small value. - View Dependent Claims (17, 18, 19, 20)
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15. A phase current detection apparatus is an apparatus which detects a phase current of a motor (4) based upon a DC link current and a vector pattern to be applied and which restricts the minimum pulse width, which apparatus is included in a motor driving apparatus for driving a motor (4) by supplying outputs from a PWM inverter (3) to the motor (4), the apparatus comprising:
adjusting means (6c)(7b) for adjusting a voltage to be applied by varying a pulse application interval in response to a fact that a desired duty has a small value.
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16. A phase current detection apparatus is an apparatus which detects a DC link current and calculates a phase current of a motor (4), which apparatus is included in a motor driving apparatus for driving a motor (4) by supplying outputs from a PWM inverter (3) to the motor (4), the apparatus comprising:
current detection means (5)(7e)(7f) for judging whether or not current detection is possible during the dead time, and for carrying out current detection in response to the judgement result representing that current detection is possible.
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21. A phase current detection apparatus is an apparatus which detects a phase current of a motor (4) based upon a DC link current and a vector pattern to be applied, which apparatus is included in a motor driving apparatus for driving a motor (4) by supplying outputs from a PWM inverter (3) to the motor (4), the apparatus comprising:
current estimation means (8b)(8d)(8h) for estimating a current from the past current values in response to the fact that an applied voltage vector is too short to measure the current.
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22. A phase current detection apparatus is an apparatus which detects a phase current of a motor (4) based upon a DC link current and a vector pattern to be applied, which apparatus is included in a motor driving apparatus for driving a motor (4) by supplying outputs from a PWM inverter (3) to the motor (4), the apparatus comprising:
current estimation means (8i)(8j) for estimating a current value at a desired timing by correcting a current detection value using a current estimation value generated from the past current detection values. - View Dependent Claims (23, 24, 25)
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26. An inverter control apparatus is an apparatus which detects a phase current of a motor (4) based upon a DC link current and a vector pattern to be applied, which apparatus is included in a motor driving apparatus for driving a motor (4) by supplying outputs from a PWM inverter (3) to the motor (4), and which carries out current controlling or position-sensor-less controlling, the apparatus comprising:
control means (9a)(9b)(9c)(9d)(9e) for carrying out the controlling using the current measurement values at two current measurement timings within a carrier interval.
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27. A phase current detection method is a method which detects a phase current of a motor (4) based upon a DC link current and a vector pattern to be applied and which restricts the minimum pulse width, which method is included in a motor driving apparatus for driving a motor (4) by supplying outputs from a PWM inverter (3) to the motor (4), the method comprising the steps of:
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estimating direction of the current at the current detection timing, and varying the minimum pulse width based upon the estimation result. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 40)
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37. A motor controlling method is a method which calculates a motor voltage from a DC link voltage and a gate-pulse width, detects a phase current from a DC link current and a vector pattern to be applied, and controls a motor (4) based upon the calculated motor voltage and the detected phase current, the method comprising the step of:
controlling the DC link voltage to be higher or lower in response with either condition of the voltage required by the motor is higher or lower, respectively. - View Dependent Claims (38, 39)
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41. A phase current detection method is a method which calculates a phase current from the current of DC link and vector pattern to be applied, the method comprising the steps of:
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connecting the converter for carrying out switching operation to the PWM inverter (3) in series, and prohibiting switching of the converter and the PWM inverter at the current detection timing. - View Dependent Claims (42)
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43. A phase current detection apparatus is an apparatus which detects a phase current of a motor (4) based upon a DC link current and a vector pattern to be applied and which restricts the minimum pulse width, which apparatus is included in a motor driving apparatus for driving a motor (4) by supplying outputs from a PWM inverter (3) to the motor (4), the apparatus comprising:
minimum pulse width varying means for estimating direction of the current at the current detection timing, and for varying the minimum pulse width based upon the estimation result. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 55, 56)
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52. A motor controlling apparatus is an apparatus which calculates a motor voltage from a DC link voltage and a gate-pulse width, detects a phase current from a DC link current and a vector pattern to be applied, and for controlling a motor based upon the calculated motor voltage and the detected phase current, the apparatus comprising:
motor voltage control means for controlling the DC link voltage to be higher or lower in response with either condition of the voltage required by the motor is higher or lower, respectively. - View Dependent Claims (53, 54)
Specification