DC motor and controlling system therefor

Details DC motor and controlling system therefor DC motor and controlling system therefor

1995-07-31

1998-08-25

Martin, David S.

Electricity: motive power systems

Motor structure adjustment or control

Brush or other current-collector control

310136, 310148, H02K 1300

Patent

active

057986258

ABSTRACT:
A dc motor wherein a driving force thereof can be used effectively with a simple and compact mechanical construction and a motor controlling system which can control such a dc motor to be driven efficiently. The motor comprises at least two coils, and change-over means for changing electric connection of the coils to change over the motor, when power is selectively supplied to the coils, between a first mode in which the torque produced is relatively high and the rotational frequency is relatively low and a second mode in which the torque is relatively low and the rotational frequency is relatively high. The motor controlling system includes selecting means for automatically selecting one of the first and second modes to control the change-over means in response to a given condition of the motor.

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