Electricity: motive power systems – Reciprocating or oscillating motor – Energizing winding circuit control
Patent
1991-02-21
1994-03-29
Shoop, Jr., William M.
Electricity: motive power systems
Reciprocating or oscillating motor
Energizing winding circuit control
318254, 318779, 388847, H02P 500
Patent
active
052988384
ABSTRACT:
A method for starting a sensorless brushless DC motor. The present invention uses the physical equations of motion of the motor to calculate commutation advancement rates during the motor's start-up period. An algorithm initially calculates the commutation advancement rates for the motor's maximum theoretical accelleration. The commutation applied to the motor is advanced through a predetermined number of commutation states using these maximum rates. After the predetermined number of commutation states have been applied, the speed of the motor is checked to determine whether the motor is spinning at a high enough speed to permit use of the motor's normal commutation state advancement system. If the motor is not up to speed, the rate at which the commutation states are advanced is incrementally decreased until satisfactory operation of the motor is obtained or until motor failure is diagnosed and starting is aborted. By starting at a high commutation state advancement rate and incrementally reducing the commutation advancement rate until proper accelleration of the motor is attained, the present invention continuously adapts the rate of advancement of the applied commutation states to the condition of the motor, thereby automatically compensating for changes in the motor's performance over time.
REFERENCES:
patent: 4162435 (1979-07-01), Wright
patent: 4455513 (1984-06-01), Fulton et al.
patent: 4641066 (1987-02-01), Nagata et al.
patent: 4678973 (1987-07-01), Elliott et al.
patent: 4922169 (1990-05-01), Freeman
patent: 4928043 (1990-05-01), Plunkett
patent: 4958948 (1990-09-01), Seima et al.
patent: 4992710 (1991-02-01), Cussat
Harth Jeff
Peters David H.
Martin David
Shoop Jr. William M.
Silicon Systems Inc.
LandOfFree
Sensorless brushless DC motor starting system and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sensorless brushless DC motor starting system and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sensorless brushless DC motor starting system and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-794732