Method and apparatus for DC motor speed control

Details Method and apparatus for DC motor speed control Method and apparatus for DC motor speed control

1994-11-17

1998-12-01

Sircus, Brian

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Field control, or field and armature control, by analog...

388806, 318599, 318609, 318634, 318685, 318254, 318439, H02P 506

Patent

active

058450459

ABSTRACT:
A memory device, e.g. a capacitor, is provided for a collectorless DC motor. This component is charged whenever a particular rotor position is reached. In so doing, a voltage value or quantity on this memory device is changed. This quantity is compared to another quantity, which is dependent on a desired parameter, e.g. ambient temperature or gas or dust concentration. A reference signal is produced when a particular reference criterion is satisfied. The difference between the beginning of this reference signal and a second predetermined rotor position, which follows the initial predetermined rotor position with respect to time, is measured, and on the basis of this measurement, the current flow of the collectorless DC motor is influenced or regulated. In particular, the current can be toggled on and off as the rotor passes certain predetermined positions.

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