Device for detecting opposite phase and open phase

Details Device for detecting opposite phase and open phase Device for detecting opposite phase and open phase

1979-09-18

1981-08-18

Smith, Jr., David

Electricity: motive power systems

Automatic and/or with time-delay means

Plural, diverse conditions or with time-delay means

361 77, G05B 500

Patent

active

042849390

ABSTRACT:
A device for detecting opposite phases and an open phase in an input three-phase voltage for a DC motor, wherein the input three-phase voltage is rectified by a three-phase bridge circuit and supplied to the armature of the DC motor. The input three-phase voltage is supplied to the three-phase bridge circuit when the maximum level is equal to or less than the reference voltage, while the input three-phase voltage is not supplied to the bridge circuit when the maximum level is greater than the reference voltage. In this case, both opposite phases and an open phase can be detected by using a common device. In addition, only two phases, such as U- and W-phases, are used for detecting opposite phases and an open phase no matter how these phases may be generated in any phase such as U-, V- or W-phase of the input three-phase voltage. As a result, the device is small in size, simple in electrical construction and low in cost.

REFERENCES:
patent: 3155880 (1964-11-01), Salina
patent: 3551748 (1970-12-01), Maynard
patent: 3629713 (1971-12-01), Szpilka
patent: 3727103 (1973-04-01), Finch et al.
patent: 3824430 (1974-07-01), Hentschel
patent: 4084205 (1978-04-01), Bohnert
patent: 4199798 (1980-07-01), Leppke et al.

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