Miniature motor with revolution-detecting generator

Details Miniature motor with revolution-detecting generator Miniature motor with revolution-detecting generator

1990-08-31

1992-01-07

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310113, 310208, 310268, 324174, 32420712, H02K 1100, H02K 300, G01P 348

Patent

active

050794680

ABSTRACT:
A miniature motor with a revolution-detecting generator, the motor having a stator formed by a permanent magnet on the motor housing and a rotor consisting of a winding on a core. Electric current is fed to the rotor winding via current feeding brushes and a commutator. A revolution-detecting generator comprising a frequency-detecting coil for receiving changes of magnet flux made by teeth on stator and rotor components generates an induced voltage proportional to the revolution of the rotor, in which a noise-suppressing coil wound in a lapped state with the frequency-detecting coil is provided. The noise-suppressing coil and the frequency-detecting coil are connected with each other in a reverse phase, and the noise-suppressing coil is connected in parallel with the frequency-detecting coil via a high-pass filter connected in series.

REFERENCES:
patent: 3967200 (1976-06-01), Tetsugu et al.
patent: 4174484 (1979-11-01), Schmider
patent: 4366405 (1982-12-01), Schmider

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