Multi-level motor load sensing circuit

Details Multi-level motor load sensing circuit Multi-level motor load sensing circuit

1992-01-27

1993-08-10

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

H02P 142

Patent

active

052352650

ABSTRACT:
A multi-level motor load sensing circuit senses first, second and third ranges of auxiliary winding voltage and provides a load-too-high signal for the first range, a load-OK signal for the second range, and a load-too-low signal for the third range, and provides an output which transitions from the load-too-high signal to the load-OK signal to the load-too-low signal as auxiliary winding voltage increases from the first range to the second range to the third range, and which transitions from the load-too-low signal to the load-OK signal to the load-too-high signal as auxiliary winding voltage decreases from the third range to the second to the first range. The output transitions twice during each of rising and falling values of auxiliary winding voltage between the first and third ranges. Hysteresis with improved tracking is also provided.

REFERENCES:
patent: 4658195 (1987-04-01), Min
patent: 4670697 (1987-06-01), Wrege et al.
patent: 4703387 (1987-10-01), Miller
patent: 4719399 (1988-01-01), Wrege
patent: 4751449 (1988-06-01), Chmiel
patent: 4751450 (1988-06-01), Lorenz et al.
patent: 4782278 (1988-11-01), Bossi et al.
patent: 5017853 (1991-05-01), Chmiel

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