Synchronous motor startup lock detection circuit and method
First Claim
1. A circuit for detecting startup failure in a motor drive system, comprising:
- a motor flux amplitude signal generator for generating a motor flux amplitude signal based on motor flux or rotor angle estimations;
a comparator having a plurality of inputs with a first input coupled to the generator for receiving the amplitude signal and having an output for producing a signal indicative of a comparison result between two or more of the plurality of inputs;
a second input in the plurality of inputs coupled to a reference value for comparison with the amplitude signal; and
the comparator output operable to indicate when the amplitude signal is above or below the reference value, thereby indicating a startup failure.
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Accused Products
Abstract
A startup failure detection system provides an indication of motor startup failure based on a flux amplitude signal value. The flux amplitude signal is derived from motor flux estimations in combination with a rotor angle estimation. The flux amplitude signal value is compared to an upper and lower threshold value, and a startup failure is indicated if the flux amplitude signal value is outside the range determined by the upper and lower threshold value. The motor drive system can be set to attempt a restart when a motor drive startup failure is detected, with the retrial current, duration and the total number of retrials being user selectable.
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Citations
31 Claims
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1. A circuit for detecting startup failure in a motor drive system, comprising:
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a motor flux amplitude signal generator for generating a motor flux amplitude signal based on motor flux or rotor angle estimations;
a comparator having a plurality of inputs with a first input coupled to the generator for receiving the amplitude signal and having an output for producing a signal indicative of a comparison result between two or more of the plurality of inputs;
a second input in the plurality of inputs coupled to a reference value for comparison with the amplitude signal; and
the comparator output operable to indicate when the amplitude signal is above or below the reference value, thereby indicating a startup failure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for detecting startup failure in a motor drive system, comprising:
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producing a flux amplitude signal derived from motor flux or rotor angle estimations;
comparing the flux amplitude signal to a reference value to produce a startup failure indication; and
discontinuing startup of the motor when a startup failure indication is produced. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A system for detecting motor startup failure, comprising:
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a device for producing a flux amplitude signal based on motor flux or rotor angle estimations;
a comparator coupled to the device for receiving the flux amplitude signal, the comparator having a reference value input, whereby the comparator outputs a signal indicative of a comparison between the flux amplitude signal and the reference value; and
a discontinuation section coupled to the comparator output and operable to discontinue startup of the motor drive based on the comparator output. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
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Specification