Rotary machines with permanent magnet

Details Rotary machines with permanent magnet Rotary machines with permanent magnet

1990-01-26

1991-07-23

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310152, 310254, H02K 117, H02K 2128, H02K 2304, H02K 112

Patent

active

050346415

ABSTRACT:
The invention relates to an improvement in the design of the magnetic circuit in a permanent-magnet rotary machine, e.g., a servomotor, with an object to stabilize the output of the motor with respect to temperature variation. The inventive improvement is in making the value of (A.sub.m B.sub.m)/(A.sub.y B.sub.ys), which is called the area factor .alpha., larger than 1 but smaller than 5, A.sub.m and B.sub.m being the cross sectional area and magnetic flux density, respectively, in the magnetic circuit of the permanent magnet and A.sub.y and B.sub.ys being the effective cross sectional area and saturation magnetic flux density at room temperature, respectively, in the magnetic circuit of the yoke.

REFERENCES:
patent: 4243903 (1981-01-01), Mishima
patent: 4283647 (1981-08-01), Herr et al.
patent: 4453097 (1984-06-01), Lordo
patent: 4469969 (1984-09-01), Tomite
patent: 4508988 (1985-04-01), Reiss et al.
patent: 4574214 (1986-03-01), Fujisaki
patent: 4774426 (1988-09-01), Mohr et al.

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