Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1998-03-04
2000-05-09
Martin, David
Electricity: motive power systems
Limitation of motor load, current, torque or force
318799, 388903, 388813, H02K 1732
Patent
active
060608501
ABSTRACT:
An electric motor control circuit that prevents lowering of a motor's rotation speed when a load is applied in the case where a rotation speed is adjusted within a range that doesn't exceed a predetermined upper limit of rotation speed. When a base current of a transistor Q1 starts to flow in response to operation of a trigger switch 3, transistor Q1 turns on and a setting signal output from a switch S2 which sets the upper limit rotation of a motor M is bypassed via a bypass way 22 by transistor Q1. Thus, a signal level of the setting signal inputted to an operational amplifier 7 is changed, and output timing of a pulse signal output from a phase control circuit 5 to a gate pulse output circuit 9 is changed and a conducting angle of a triac Q2 is controlled. Because the trigger switch 3 does not adjust an output level of operational amplifier 7, the rotation speed of motor M does not decrease when the load is applied.
REFERENCES:
patent: 4316129 (1982-02-01), Shapiro et al.
patent: 4414500 (1983-11-01), Schneider
patent: 4734629 (1988-03-01), Lessig, III et al.
patent: 5760553 (1998-06-01), Astic et al.
Makita Corporation
Martin David
LandOfFree
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