Method and circuit arrangement for operating an electric motor

Details Method and circuit arrangement for operating an electric motor Method and circuit arrangement for operating an electric motor

1996-03-15

1998-05-19

Cabeca, John W.

Electricity: motive power systems

Limitation of motor load, current, torque or force

318138, 81469, 388815, H02K 1732

Patent

active

057540195

ABSTRACT:
The invention relates to a method for operating an electric motor in an electrical hand-held tool, such as an electric screwdriver, battery-powered drill or the like, the electric motor being operated during the operating phase (17) at a first rotation speed, which can possibly be preset variably, until a preset limiting torque is reached. On reaching the limiting torque, the electric motor is switched to a further operating phase, which lasts until the electric motor is switched off manually by the user. In this further operating phase, a final torque (20), which is interrupted periodically by torque pauses (19), is exerted by the electric motor. A circuit arrangement for implementation of this method is also described.

REFERENCES:
patent: 4618805 (1986-10-01), Hornung
patent: 5038084 (1991-08-01), Wing
patent: 5062491 (1991-11-01), Takeshima et al.
patent: 5083068 (1992-01-01), Neef
patent: 5203242 (1993-04-01), Hansson
Willy Frank: "Phasenanschnittsteuerungen -problem-bezogen". In: Elektronik, 4/Feb. 22, 1985, pp. 86-90.

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