Overload detection and warning system for electric motors in...

Details Overload detection and warning system for electric motors in... Overload detection and warning system for electric motors in...

H - Electricity

02

H

341/93, 341/108.

H02H 7/085 (2006.01) G05B 19/4062 (2006.01) H02H 6/00 (2006.01)

Patent

CA 1233218

ABSTRACT Thermal overload of the power tool is sensed by comparing a continually updated thermal model of the tool with a predetermined limit. The thermal model is updated in accordance with operating parameters such as motor speed and power delivered (conduction angle) and implemented using numerical integration based on a look-up table matrix. When overload is detected, power to the tool is gradually reduced, with attendant reduction in speed, followed by a cyclic or warbling increase and decrease in power to provide fluctuating low speed behavior, which may be readily recognized by the tool operator as an overload warning.

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