Title :
Sensorless brushless DC control using a current waveform anomaly
Author :
Johnson, James P. ; Ehsani, M.
Author_Institution :
Texas A&M Univ., College Station, TX, USA
Abstract :
This paper develops a new method of sensorless control for brushless DC (BLDC) machines. The new sensorless control method utilizes relative rotor position feedback information which is extracted from the hysteresis chopping of the sensed phase current waveforms in a nonsalient, trapezoidal back-EMF, surface-mounted permanent-magnet BLDC. Details of the new method of sensorless brushless DC control are revealed. The existence and uniqueness of the hysteresis waveform feedback information is shown. A simulation of two modes of the new sensorless control and experimental validation are performed
Keywords :
DC machines; brushless machines; control system analysis; control system synthesis; feedback; machine testing; machine theory; machine vector control; permanent magnet machines; position control; rotors; brushless DC machines; control design; control simulation; current waveform anomaly; hysteresis chopping; hysteresis waveform feedback; relative rotor position feedback; sensed phase current waveforms; sensorless control; Brushless DC motors; Computer industry; Costs; Feedback; Hysteresis; Microprocessors; Permanent magnets; Rotors; Sensorless control; Torque;
Conference_Titel :
Industry Applications Conference, 1999. Thirty-Fourth IAS Annual Meeting. Conference Record of the 1999 IEEE
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-5589-X
DOI :
10.1109/IAS.1999.799946
