Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1996-07-03
1998-08-25
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310156, 310216, H02K 122, H02K 2112, H02K 106
Patent
active
057985960
ABSTRACT:
A permanent magnet motor with enhanced inductance which comprises a motor frame having annular inner walls defining a void therein and a stator mounted on and extending around the periphery of the inner walls of the frame in the void in the motor frame. The stator includes windings positioned thereon for developing current from power supplied to the motor, the innermost portion of the stator defining a radial inner portion of the void. A rotor is mounted in the void radially inwardly of the stator for concentric rotation in the motor frame in closely spaced-apart relation to the stator. The rotor has an iron core for air gap flux interaction with the stator, and the rotor has a magnet zone and a lamination zone extending axially along the length of the rotor. The magnet zone has a permanent magnet positioned on the rotor and projecting therefrom for interaction with the windings on the stator to produce magnetic-field induced torque for rotating the rotor. The lamination zone has a plurality of stacked laminations positioned on the rotor for rotation therewith, the lamination zone being adjacent to the magnet zone and devoid of magnets. The laminations extend from the rotor shaft into closely spaced-apart radial alignment with a portion of the windings and forming an area of decreased air gap and increased inductance between the stator and the rotor.
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Tomy Sebastian and Gordon R. Slemon, Operating Limits of Inverter-Driven Permanent Magnet Motor Drives, Entire Article is Relevant, Mar./Apr. 1987 and Place of Publication Unknown to Applicant.
Author Unknown to Applicant, Vector Control of Synchronous Machines, Entire Article is Relevant; however, Particularly p. 82 Section 3.1.2, , Date and Place of Publication Unknown to Applicant.
Shigeo Morimoto, Yoji Takeda and Takao Hirasa, Expansion of Operating Limits for Permanent Magnet Motor by Current Vector Control Considering Inverter Capacity, P. 869 is Relevant, Place of Publication Unknown to Applicant, Sep./Oct. 1990.
Pacific Scientific Company
Stephan Steven L.
Wallace, Jr. Michael J.
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