Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1996-11-26
1998-06-16
Masih, Karen
Electricity: motive power systems
Induction motor systems
Primary circuit control
318798, 318815, 318254, 318138, 318439, 318599, 388811, H02P 528
Patent
active
057676542
ABSTRACT:
A pulse width modulated (PWM) motor drive with back EMF monitoring of the floating phase of a polyphase motor is arranged so that zero crossings of the back EMF can be read without interference by PWM switching. A measure is taken of an interval between two zero crossings and, in the next interval, the PWM switching is stopped near to and before the next expected zero crossing, based on the time of the last prior interval. A period counter counts up during the first interval and another counter, loaded with the previous count reached by the period counter, counts down at the same rate during the second interval until a certain number is reached, near to but before zero, to generate a signal that results in stopping PWM switching until after the next zero crossing is detected.
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Menegoli Paolo
Nguyen Chinh
Beyer Steve D.
Galanthay Theodore E.
Jorgenson Lisa K.
Masih Karen
SGS-Thomson Microelectronics Inc.
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