Induction motor controller

Electricity: motive power systems – Induction motor systems – Primary circuit control

Reexamination Certificate

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Details

C318S801000, C318S805000, C388S917000

Reexamination Certificate

active

11521018

ABSTRACT:
An induction motor controller that may include three phase paths leading from a power input to a power output, a solid-state switching device interposed between the power input and the power output on each of the three phase paths, a voltage sensor coupled to two of the phase paths between the solid-state switching device and the power output, a current sensor on one of the phase paths, a processor communicatively coupled to the voltage sensor, the current sensor, and the solid state switching device; and a memory coupled to the processor. The processor may be configured to calculate a motor parameter based on a signal from the voltage sensor and a signal from the current sensor and store the calculated motor parameter in memory.

REFERENCES:
patent: 4385251 (1983-05-01), Mallick et al.
patent: 4405873 (1983-09-01), Nondahl
patent: 4490780 (1984-12-01), Nondahl
patent: 4856965 (1989-08-01), Katsuie et al.
patent: 5347277 (1994-09-01), Nondahl et al.
patent: 5510687 (1996-04-01), Ursworth et al.
patent: 6172498 (2001-01-01), Schmidt et al.
patent: 6218749 (2001-04-01), Nondahl et al.
patent: 6351397 (2002-02-01), Sawa et al.
patent: 6504275 (2003-01-01), Nondahl et al.
Stephen J. Chapman, “Electric Machinery Fundamentals”, Third Edition, McGraw-Hill Publishing, New York, 1999. Appendix A explains a three-phase circuit. Specifically, pp. 652-659 explains the relationship of phase quantity and line quantity between a delta-circuit configuration and a Y-circuit configuration.

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