Electricity: motive power systems – Limitation of motor load – current – torque or force
Reexamination Certificate
2007-08-14
2007-08-14
Ip, Paul (Department: 2837)
Electricity: motive power systems
Limitation of motor load, current, torque or force
C318S254100, C318S268000, C318S438000
Reexamination Certificate
active
11237889
ABSTRACT:
A method for attenuating switching noise from back electromotive force (EMF) observations in a motor is described. The motor is controlled by pulse width modulation (PWM) signals provided at a PWM frequency. The method comprises sampling back EMF observed in the motor at a sampling frequency at least two times greater than the PWM frequency to obtain over-sampled back EMF readings; and filtering the over-sampled back EMF readings to remove switching noise and obtain cleaned back EMF observations. A system implementing the method is also described.
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Agile Systems Inc.
Ip Paul
McCarthy Tétrault LLP
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