Control system for electric motor

Electricity: motive power systems – Positional servo systems – Digital or numerical systems

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318615, 318608, 318717, G05B 1928

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active

045409250

ABSTRACT:
The motor control system for an electric motor having no mechanical means integral therewith for commutating current provides the ability to control position, velocity and torque of such a motor to the degree achievable with DC motors having mechanical commutators. Such a result is achieved by maintaining a desired spatial relationship between the resultant magnetic field created by the stationary member and the movable member of the electric motor. The control system includes detecting apparatus for detecting parameters of the motor that dictate, in part, the desired spatial relationship within the motor and command apparatus for creating a motor command signal which, when generated in the motor, causes the desired spatial relationship to be established. The present invention also permits maintenance of an optimal spatial relation--a spatial relationship that causes the motor to produce desired torque with a minimum excitation.

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patent: 4125796 (1978-11-01), Nagase et al.
patent: 4258301 (1981-03-01), Kawa
patent: 4276505 (1981-06-01), Bose
patent: 4295084 (1981-10-01), Nagase et al.
patent: 4315200 (1982-02-01), Yamada et al.
patent: 4331910 (1982-05-01), Kohzai et al.
patent: 4357569 (1982-11-01), Iwakane et al.

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