Electricity: motive power systems – Synchronous motor systems – Armature winding circuits
Reexamination Certificate
2007-03-13
2007-03-13
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Armature winding circuits
C318S132000, C318S254100, C318S434000, C318S490000, C324S173000, C324S179000
Reexamination Certificate
active
10334198
ABSTRACT:
A method and apparatus for improving speed measurement quality in systems having multi-pole machines is taught. The method compensates for pole misalignment by computing speed based upon moving average techniques. In one embodiment, a moving average speed averaged over a complete interval of rotation is determined, based upon measurements of one or more magnetic pole position sensors for magnetic pole location. In another embodiment, a time interval between two poles is averaged over one or more rotational periods, and the average time interval is used to determine the moving average speed. Computation of the moving average speed reduces errors in speed measurements due to pole misalignment and may provide for smaller control adjustment times for controlling motor speed variability. In one embodiment, the speed measurement system includes a multi-pole rotor, and a controller having a capture timer and a buffer.
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Grand Kerry E.
Hampo Richard J.
Zhao Yifan
Ballard Power Systems Corporation
Colon Santana Eduardo
Donovan Lincoln
Seed IP Law Group PLCC
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