Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1987-08-31
1989-05-09
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
324173, G01P 348, G01P 354
Patent
active
048292540
ABSTRACT:
A fractional horsepower permanent magnet direct-current motor has a velocity indicating device positioned around the commutator, between the brush gear and the armature. The device comprises a conductor in the form of a square wave copper strip which is printed on a flexible support and centered on a circle about the motor shaft, and a magnet assembly mounted on the armature. Magnet assembly comprises radially extending blades which are formed from plastics bonded magnetic material. The blades are magnetized so that adjacent blades have opposite polarity. As the magnet rotates with the shaft, the blades move relative to the conductor and so induce an electrical signal in the conductor. The signal can be monitored to indicate the motor speed as is generally known. The blades also act as a centrifugal fan, helping to cool the motor.
REFERENCES:
patent: 3731126 (1973-05-01), Hagenlocher et al.
patent: 3790832 (1974-02-01), Patel
patent: 4695795 (1987-09-01), Nakamizo et al.
patent: 4701650 (1987-10-01), Maemine
Eisenzopf Reinhard J.
Johnson Electric Industrial Manufactory Ltd.
Miele Anthony L.
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