D. C. electric motor

Details D. C. electric motor D. C. electric motor

1989-08-09

1991-03-19

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310177, 318439, 318138, H02K 2316

Patent

active

050013750

ABSTRACT:
In a d.c. motor, the stator may form the armature and has its windings inserted in slots in its cylindrical surface and the rotor may comprise a permanent magnet or be provided with d.c. windings. Switching means operate in synchronism with rotation of the rotor to connect a d.c. source to the armature windings so that a rotating field is produced in arrears of the rotor field to exert a repelling force on the rotor poles. Because the rotor and stator fields are in opposition, rather than in mutual assistance, less energy is needed to energize the windings to produce a given torque. Also the current in each winding is very low when commutation occurs and sparking avoided.

REFERENCES:
patent: 1655286 (1928-01-01), Nietsche
patent: 3546507 (1970-12-01), Wiegel
patent: 3631273 (1971-12-01), Stein
patent: 4135107 (1979-01-01), Kammerbeck et al.
patent: 4321494 (1982-03-01), MacNab

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