Sensorless starting control for a brushless DC motor

Details Sensorless starting control for a brushless DC motor Sensorless starting control for a brushless DC motor

1986-10-07

1987-07-07

Shoop, Jr., William M.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, 318272, H02P 602

Patent

active

046789731

ABSTRACT:
A sensorless control system for reliably starting a brushless DC motor even when the motor/load inertia is relatively high and even though the rotor may be rotating in the wrong direction when starting is initiated. The line-to-line generated voltages of two deenergized stator windings are compared as a given stator winding is energized. The energization is either interrupted or permitting to continue depending on the comparison. If the comparison indicates that the rotor is turning in the correct direction, the energization is continued to produce synchronous positive torque for accelerating the rotor in that direction. If the generated voltage comparison indicates that the rotor is turning in the wrong direction, the winding energization is interrupted, and the next sequential winding is energized. The interruption occurs in alternate windings of the energization sequence, effectively reversing the energization sequence to generate substantially maximum synchronous braking torque for bringing the rotor substantially to a stop, whereafter starting may be attempted again.

REFERENCES:
patent: 4262236 (1981-04-01), Gelenius et al.
patent: 4403177 (1983-09-01), Weber et al.
patent: 4431953 (1984-02-01), Schray et al.
patent: 4595865 (1986-06-01), Jahns
patent: 4603283 (1986-07-01), Oltendorf

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