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US 2003/0164692 A1Published application
Method and apparatus for improving speed measurement quality in multi-pole machines
AssigneeBallard Power Systems Inc.
InventorsKerry E. Grand, Richard J. Hampo, Yifan Zhao
Life of this patent
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Abstract
A method and apparatus for improving the speed measurement quality in systems having multi-pole machines is taught. The method compensates for pole misalignment by moving average techniques.
Claims24
A method for use with multi-pole machines, said method comprising:
- detecting a first time at which a first pole passes a first stator position;
- detecting a second time at which a second pole passes the first stator position;
- determining an elapsed time between the first and the second times;
- recalling at least one historical elapsed time between the first and the second poles passing the first stator position;
- calculating an average time based on the elapsed time and the at least one historical elapsed time;
- and
- calculating a rotational quantity on the basis of the average time.
4 more elements
A multi-pole machine system, said system comprising:
- means for detecting a first time at which a first pole passes a first stator position and a second time at which a second pole passes the first stator position;
- means for determining an elapsed time between the first and the second times;
- means for recalling at least one historical elapsed time between the first and the second poles passing the first stator position;
- means for calculating an average time based on the elapsed time and the at least one historical elapsed time;
- and
- means for calculating a rotational quantity on the basis of the average time.
3 more elements
An apparatus having a capability of determining a speed of a multi-pole, the apparatus comprising:
- at least one magnetic pole position sensor positioned to detect a passing of each pole and configured to provide a pulse in a pulsed signal in response to each passing of each pole;
- and
- a controller for measuring a time between a rising edge of one pulse and a rising edge of a next pulse in the pulsed signal and storing a total time in one revolution of a motor, the controller comprising a buffer for storing substantially all time values measured from pulse to pulse.
Dependencies are inferred from the claim text.