Overload detection and warning system for electric motors in pow

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

1984-09-24

1985-10-29

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318434, 318245, 318475, 318341, 364474, H02P 516

Patent

active

045502773

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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