Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1997-08-01
1998-10-13
Masih, Karen
Electricity: motive power systems
Limitation of motor load, current, torque or force
318138, 318254, 318599, 318798, 318799, 318800, 318801, 318802, 318803, 318804, 318805, 318806, 318807, 318808, 318809, 318810, 318811, 318812, 318813, 318814, 318815, H01R 3946
Patent
active
058217142
ABSTRACT:
A commutation control strategy for eliminating torque ripple and noise from a brushless motor which has a plurality of motor phases connected in a bridge, each phase having a top switching device provided between a phase winding and a positive voltage supply and a bottom switching device provided between the phase winding and a less positive voltage supply in which following commutations of the motor, when the current flowing in a first phase is decaying towards zero and the current in a second phase is rising from zero, the switching devices are operative between a state in which the current flowing in the first phase is caused to decay at a first rate, and another state in which the current flowing in the first phase is caused to decay at a second rate which is lower than the first rate so that the rate of decay of the current in the first phase substantially matches the rate of rise of the current in the second phase.
REFERENCES:
patent: 4164697 (1979-08-01), Everett
patent: 5191269 (1993-03-01), Carbolante
Lucas Industries Public Limited Company
Masih Karen
LandOfFree
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