Method of starting a sensorless multiphase dc motor

Details Method of starting a sensorless multiphase dc motor Method of starting a sensorless multiphase dc motor

1993-02-24

1994-06-21

Shoop, Jr., William M.

Electricity: motive power systems

Switched reluctance motor commutation control

318439, 318138, H02K 2300

Patent

active

053230949

ABSTRACT:
In a sensorless multiphase dc motor which is started by repeating a sequence of steps in order to supply the stator with a series of discrete currents for rotating the rotor in a desired direction, the start-up sequence has a step(s) of conducting a magnetizing shift action by changing the flow of current from one direction to the reverse direction or vice versa thus reducing its time consumption and also, each of the plural phase coils is energized with a high amplitude of current to produce a higher torque thus enhancing the start-up characteristics of the motor.
In particular, the magnetizing shift action from one direction to the reverse direction or vice versa is conducted multiple times in each of the plural phase coils during the start-up sequence and the start-up sequence itself is repeated multiple times. As the result, the start-up characteristics of the motor will be more enhanced.

REFERENCES:
patent: 4472664 (1984-09-01), Chung
patent: 5001405 (1991-03-01), Cassat
patent: 5124604 (1992-06-01), Swartz

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