Induction motor start-stall detection apparatus and method

Details Induction motor start-stall detection apparatus and method Induction motor start-stall detection apparatus and method

1983-10-11

1985-10-15

Goldberg, E. A.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318794, 361 29, H02P 542

Patent

active

045477205

ABSTRACT:
A stall detection method for electric induction motors and apparatus utilized the stator current and voltage phase difference as proportional to percentage synchronous motor speed, and detects a stall condition from this speed as a parameter of motor movement. The invention includes differentiating the phase difference to obtain motor acceleration as a parameter potentially indicative on its own, or in conjunction with phase difference, of a motor stall condition.

REFERENCES:
patent: 3600657 (1970-06-01), Pfaft
patent: 3727103 (1973-04-01), Finch et al.
patent: 4016468 (1977-04-01), Graf
patent: 4194145 (1980-03-01), Ritter
patent: 4251846 (1981-02-01), Pearson et al.

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