Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1985-02-26
1987-05-19
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310268, H02K 1100
Patent
active
046671226
ABSTRACT:
A motor has been proposed in German Offenlegungsschrift DI-OS 2,730,142 and corresponding U.S. Pat. No. 4,211,963. The windings of the tacho winding are diposed here next to the stator winding in the flat air gap of the main magnet, and the current changes in the statorwinding induce therefor in the tachowinding voltages interfering with a precise working control. On the other hand would a disposition of the tacho generator at a different position of the motor increase its axial length considerably, especially when a magnetic shielding between the motor and the tachogenerator is provided. Therefore, it is a purpose of the present invention to provide a motor ofthe kind initially cited, which with compact construction and especially short length in direction of its rotation axis provides a low interference tacho signal remaining the same or improving with increasing age of the motor, for example in order to improve in any case, but at least to keep the same the ganging flutter of a speed controlled direct drive motor for a record player.
REFERENCES:
patent: 4517480 (1985-05-01), Muller
Duggan Donovan F.
Papst Motoren KG
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