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A permanent magnet synchronous motor system. The system uses a permanent magnet AC synchronous motor having an elongated housing, of the type used in progressive cavity pumping applications. Within the stator, a multi-section rotor is rotatably mounted. The rotor includes a plurality of rotor sectio

A permanent magnet synchronous motor system. The system uses a permanent magnet AC synchronous motor having an elongated housing, of the type used in progressive cavity pumping applications. Within the stator, a multi-section rotor is rotatably mounted. The rotor includes a plurality of rotor sections that are angularly offset from each other. The rotor sections are mounted on a drive shaft, and the sum of the offsets is generally comparable to the angular displacement undergone by the drive shaft under a normal operating load.

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1. A permanent magnet synchronous motor system, comprising:a permanent magnet synchronous motor having an elongated housing; a stator having a plurality of windings; and a rotor rotatably disposed within the stator, the rotor including a plurality of rotor sections, each rotor section including a pl

1. A permanent magnet synchronous motor system, comprising:a permanent magnet synchronous motor having an elongated housing; a stator having a plurality of windings; and a rotor rotatably disposed within the stator, the rotor including a plurality of rotor sections, each rotor section including a plurality of permanent magnets, the permanent magnets of adjacent rotor sections being offset from each other a predetermined angular displacement, the plurality of rotor sections being mounted over a shaft with each rotor section rotatably fixed with respect to the shaft by a corresponding key and keyway, wherein the shaft includes a plurality of keyways, each keyway being at an axially unique location and being offset from each adjacent keyway by the predetermined angular displacement.