Electricity: motive power systems – Alternating current commutating motors – Universal or a.c.-d.c. motors
Patent
1985-12-10
1989-04-18
Ro, Bentsu
Electricity: motive power systems
Alternating current commutating motors
Universal or a.c.-d.c. motors
318114, 318345D, 318345H, H02P 7638
Patent
active
048230545
ABSTRACT:
A circuit for phase control of an AC-DC motor for a machine operated in defined (preferably two) load conditions with a controllable current flow control valve located in series with the motor and associated triggering pulse stage. The circuit includes a measuring circuit designed as a rectifier circuit with filter link for detection of the load current flowing through the load path of the current flow controller or through the motor as well as a threshold value circuit which determines a first basic desired value of the triggering voltage level at the triggering pulse stage at low load current values (idling). If a triggering threshold, adjustable at the triggering value circuit, is exceeded, then the triggering voltage level is switched over onto a second firmly or permanently adjusted value, so that the motor now operates at nominal load with nominal rpm through the current flow control valve, now controlled to be fully advanced. The circuit does not require any information about the instantaneous rpm and is distinguished by its simple construction and reliable operation. It is particularly suitable for utility machines, which operate either in idling or under nominal load conditions.
REFERENCES:
patent: 4481448 (1984-11-01), Bishop
patent: 4503370 (1985-03-01), Cuneo
patent: 4574226 (1986-03-01), Binder
Hilti Aktiengesellschaft
Ro Bentsu
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