Electricity: motive power systems – Alternating current commutating motors – Universal or a.c.-d.c. motors
Patent
1995-12-27
1997-06-03
Wysocki, Jonathan
Electricity: motive power systems
Alternating current commutating motors
Universal or a.c.-d.c. motors
318799, 361 25, H02K 2300
Patent
active
056358067
ABSTRACT:
The method and the arrangement for temperature monitoring of universal motors based upon a resistance measurement of a field winding, wherein a DC current component of low magnitude is superimposed upon the motor current for elimination of the complex values of the AC current impedance, and wherein the voltage drop in the field winding is amplified and freed from the AC voltage component and is compared as a DC voltage component proportional to the ohmic resistance of the field winding to a temperature independent DC voltage component, which is obtained in an analogous manner from a current measuring shunt, through which the motor AC current, including the superimposed DC current component, flows.
REFERENCES:
patent: 3736479 (1973-05-01), Soeda
patent: 3794898 (1974-02-01), Gross
patent: 4119895 (1978-10-01), Muller
patent: 4157036 (1979-06-01), Kivenson
patent: 4163181 (1979-07-01), Farber
patent: 4195254 (1980-03-01), Gurwicz
patent: 4441065 (1984-04-01), Bayer et al.
patent: 4503370 (1985-03-01), Cuneo
patent: 4618805 (1986-10-01), Hornung
Millauer Wolfgang
Wissmach Walter
Hilti Aktiengesellschaft
Wysocki Jonathan
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