Electronic motor load sensing device

Details Electronic motor load sensing device Electronic motor load sensing device

1993-02-05

1995-12-05

Hoff, Marc S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 28, 361 30, 361 79, H02H 700

Patent

active

054734975

ABSTRACT:
A device for measuring energy delivered by a motor to a load is adapted to be connected to the motor which is coupled to the load and connected to a power source through first and second power supply lines. The device includes a line voltage sensing circuit for sensing the voltage across the power supply lines, a line current sensing circuit for sensing the current flowing through the motor and a pulse width modulator which modulates the sensed voltage to produce a pulse width modulated first electrical signal. The device also includes a first switch, responsive to the pulse width modulated first electrical signal which modulates an output of the line current sensing circuit to produce a power waveform and an integrator which integrates the power waveform to produce an output signal indicative of the energy delivered by the motor to the load. The device further includes a switch controller which compares the output signal to a first reference signal to detect the existence of an overload condition and which compares the output signal to a second reference signal to detect the existence of an underload condition. The switch controller opens a second switch to disconnect the motor from the power source in response to either an overload condition or an underload condition.

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