Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1992-09-02
1994-10-11
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 67R, 310181, 310267, H02K 1100, H02K 2112
Patent
active
053550439
ABSTRACT:
A brushless polyphase DC motor is applied to a spindle motor for a disk device and has a stator generating a magnetic field in an excited state and a rotor obtaining turning force by the electromagnetic interaction with the stator. When an electrical charge current is intermittently and alternately supplied to the coil of the stator in opposite directions, for example, if electrical charge is stopped after current in the normal direction is supplied, a residual magnetic field density is generated in the stator during the stopping period. The residual magnetic flux density is employed for performing electrical charge in the reverse direction by supplying current in the reverse direction. In this case, a high torque is generated by increasing a change in the magnetic flux density.
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patent: 5164622 (1992-11-01), Kordik
Haszko D. R.
Nippon Densan Corporation
Stephan Steven L.
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