Input vector set for position detection of PM motors

摘要

A method of determining angular position (A) of a rotor of an N-phase permanent magnet motor (PMM). A processor having an associated stored angular position determination (APD) algorithm is programmed to implement the algorithm to cause an associated motor controller to execute steps including forcing one vector at a time a phase vector set of current or voltage vectors to stator terminals of windings for the N-phases a positive and negative magnitude vector, wherein the vector magnitude is sufficiently small to not move the rotor, and a time duration for the forcing current or voltage vectors is essentially constant. The resulting stator current or voltage levels are measured for each current or voltage vector. An N-dimension current vector or voltage vector is generated from superposition of the resulting stator current levels or resulting stator voltage levels. The N-dimension current vector or voltage vector is used to determine angular position.

主权项

1. A method of determining an angular position (A) of a rotor of an N-phase permanent magnet motor (PMM), comprising:
providing a processor having an associated memory storing an angular position determination (APD) algorithm, wherein said processor is programmed to implement said APD algorithm to cause an associated motor controller to execute:
forcing one vector at a time a phase vector set of current vectors or voltage vectors to stator terminals of stator windings for said N-phases of said PMM including a positive magnitude vector and a negative magnitude vector, wherein a magnitude of said current vectors or said voltage vectors are all sufficiently small to not move said rotor, and wherein a time duration for said forcing said current vectors or said voltage vectors is essentially constant;measuring resulting stator current or voltage levels for each said current vectors or said voltage vectors;generating an N-dimension current vector or voltage vector from superposition of said resulting stator current levels or said resulting stator voltage levels, andusing said N-dimension current vector or voltage vector, determining said angular position.