Drive control with overload protection for a drill device

Details Drive control with overload protection for a drill device Drive control with overload protection for a drill device

1988-08-26

1989-12-05

Ro, Bentsu

Electricity: motive power systems

Limitation of motor load, current, torque or force

318433, 388819, H02P 762

Patent

active

048855111

ABSTRACT:
Drive control for a drilling device including a universal motor is arranged so that the total available mains voltage is applied when a fraction of the motor torque, available for the full work range of the device, is reached. If a higher torque is desired, the motor torque/rotational speed curve follows the natural characteristic line until a load point is reached where current limitation occurs. Accordingly, as the motor speed decreases as the normal work range is exceeded, the operator of the drilling device is signaled concerning the load state due to the noise developed in the drilling device.

REFERENCES:
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patent: 4119897 (1978-10-01), Skoog
patent: 4233549 (1980-11-01), Dighe
patent: 4413212 (1983-11-01), Okamoto et al.
patent: 4458186 (1984-07-01), Kuriyama et al.
patent: 4481448 (1984-11-01), Bishop
patent: 4490657 (1984-12-01), Smith
patent: 4517506 (1985-05-01), Heinrich et al.
patent: 4574226 (1986-03-01), Binder
patent: 4605883 (1986-08-01), Cockroft
patent: 4605885 (1986-08-01), Mitsuhashi
patent: 4659976 (1987-04-01), Johanson

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