Motor having rotational-speed detector

Details Motor having rotational-speed detector Motor having rotational-speed detector

1998-07-31

2000-02-01

LaBalle, Clayton

Electrical generator or motor structure

Dynamoelectric

Rotary

310268, H02K 1100

Patent

active

060206632

ABSTRACT:
A motor provided with a rotational-speed detector has a driving coil for driving the motor, a driving magnetized portion, a rotational-speed detecting magnetized portion, and a detecting pattern. An even number of blocks of the detecting patterns having detecting lines are provided. A pair of blocks are displaced from each other in the rotating direction in relation to the arrangement of the N poles and the S poles of the rotational-speed detecting magnetized portion by an amount equal to one pitch between the detecting lines. An adder for adding currents flowing in the detecting lines of the respective blocks is provided. Alternatively, a subtracter for calculating a difference between currents flowing in the above-mentioned detecting lines is provided. Due to magnetic flux from the driving coil, noise currents are generated in the connecting lines for connecting the detecting line. However, noise currents IA and IB generated in the respective blocks A and B cancel each other. Absolute values of rotational-speed detecting signals Ia and Ib are added. Accordingly, an adverse influence of the magnetic flux generated from the driving coil is eliminated, thereby stabilizing the level of the rotational-speed detection output. The rotational speed of the motor is thus controlled with high precision.

REFERENCES:
patent: 4410853 (1983-10-01), Ikoma
patent: 4461994 (1984-07-01), MacDonald
patent: 4517480 (1985-05-01), Muller
patent: 4695795 (1987-09-01), Nakamizo et al.
patent: 4803425 (1989-02-01), Swanberg
patent: 4924161 (1990-05-01), Ueki et al.
patent: 5019773 (1991-05-01), Sugiura et al.
patent: 5079511 (1992-01-01), Donat
patent: 5150115 (1992-09-01), deJong et al.
patent: 5602471 (1997-02-01), Muth et al.

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