Permanent magnet direct current motor apparatus

Details Permanent magnet direct current motor apparatus Permanent magnet direct current motor apparatus

1985-10-07

1987-08-04

Shoop, Jr., William M.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, H02K 2300

Patent

active

046848550

ABSTRACT:
Disclosed is a permanent magnetic direct current motor apparatus which provides high constant torque and constant speed through a large stepping angle under varying output shaft load conditions. The apparatus includes a rotor, a plurality of stators and an electronic control device for providing a constant torque and speed. The rotor is constructed of a cylindrical homogeneous core having an outer, segmented ring formed from a plurality of permanent magnets. The magnets are of alternating polarity and are divided into groups. There is a stator apparatus surrounding the rotor which is composed of cylindrically spaced rows of electrically conductive coils radially spaced apart. A timing disk concentric with and rotating with the rotor senses the speed of the rotor and feeds back periodic timing pulses to an electronic switching system to control the current through the stators. The stators are electromagnetically coupled to the permanent magnet rotor surface. The current through the stators thereby control the magnitude of the electromagnetic flux and causes the rotor to maintain a constant speed as output shaft loads vary.

REFERENCES:
patent: 2907903 (1959-10-01), Reijnst et al.
patent: 3909691 (1975-09-01), Wilson et al.
patent: 4004207 (1977-01-01), Dickson
patent: 4105865 (1978-08-01), Guillory
patent: 4417186 (1983-11-01), Hirose et al.
patent: 4454438 (1984-06-01), Yamashita

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