DC motor unit with a rotational speed detector

Details DC motor unit with a rotational speed detector DC motor unit with a rotational speed detector

1991-04-09

1992-06-23

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 88, 310 89, 310 91, 310155, H02K 1100

Patent

active

051246023

ABSTRACT:
A d.c. motor unit with a rotational speed detector comprising a d.c. motor (1) having an output end and an idle end, and a rotational speed detector (14) water-tightly attached to the motor output end. The d.c. motor (1) comprises a motor frame (2) including an output end and an idle end, a mounting bracket (9) attached to the output end of the motor frame (2) and a rotary shaft (4) having an idle end rotatably supported by the motor frame (2) and an output end rotatably supported by and extending outwardly through the mounting bracket (9). The rotational speed detector (14) comprises a rotary portion mounted on the output end of the rotary shaft (4) and a stationary portion mounted to the mounting bracket at the output end of the motor frame (2). The rotational speed detector (14) comprises a substantially elastic permanent magnet plate (20) for generating a magnetic flux (.phi.) extending through a closed magnetic circuit including contact surfaces which are in pressure contact with the permanent magnet plate (20).

REFERENCES:
patent: 3167676 (1965-01-01), Fuller
patent: 3203353 (1965-08-01), Ruby
patent: 3967200 (1978-06-01), Tetsugu et al.
patent: 4750371 (1988-06-01), Kobayashi et al.
patent: 4841187 (1989-06-01), Hauke et al.
patent: 4899075 (1990-02-01), Hasebe
patent: 4900967 (1990-02-01), Amano et al.
patent: 4954774 (1990-09-01), Richmond
patent: 4970423 (1990-11-01), Tamae
patent: 4982125 (1991-01-01), Shirakawa
patent: 5013946 (1991-05-01), Sata

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