Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1999-05-13
2000-02-08
Ro, Bentsu
Electricity: motive power systems
Limitation of motor load, current, torque or force
318254, 318430, H02P 618, H02P 620
Patent
active
060231416
ABSTRACT:
In a method for operating a brushless motor with commutated stator excitation and permanent rotor field, the stator is initially energized partly. Depending on the polarity of the back electromagnetic force (EMF) in the non-energized stator coil at a predetermined time point (t(n)+T.sub.OFF) and on the occurrence of a EMF zero-crossing event in a following time frame (T.sub.MONITOR), the next stator commutation (t'(n+1)) is scheduled. Thereby, three cases (i)(ii)(iii) are distinguished and detected events (.tau.(n-1)) in previous commutation cycles (n-1) are taken into account.
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"Sensorless Position and Speed Control of a Brushless DC Motor from Start-up to Nominal Speed", L. Cardoletti et al. From the Swiss Federal Institute of Technology, Lausanne, Switzerland (EPFL), EPE Journal, vol. 2, No. 1, Mar. 1992.
Martinez Anthony M.
Motorola Inc.
Ro Bentsu
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