DC powered hand tools with automatic braking system

Details DC powered hand tools with automatic braking system DC powered hand tools with automatic braking system

1998-08-20

2000-07-04

Ip, Paul

Electricity: motive power systems

Braking

Dynamic braking

318362, 318378, 388937, H02P 318

Patent

active

060843667

ABSTRACT:
A hand held battery powered tool having a motor with a rotor within a stator having stator windings and a motor control trigger operably movable between off and enable positions with means for sensing the trigger position and proving an output signal indicating trigger movement to the off position and means responsive to the output signal for shorting the motor windings and dissipating the kinetic energy of the rotating rotor as heat. A method of retarding rotation of the rotor of the motor comprising the steps of sensation of motor operation command and shorting the motor windings upon sensing the motor operation command while continuing electronic commutation of the motor windings is also provided.

REFERENCES:
patent: 3854080 (1974-12-01), Bambara et al.
patent: 4097704 (1978-06-01), Piber
patent: 4267914 (1981-05-01), Saar
patent: 4839533 (1989-06-01), Aga
patent: 5014793 (1991-05-01), Germanton et al.
patent: 5136220 (1992-08-01), Philipp
patent: 5235261 (1993-08-01), Philipp
patent: 5268622 (1993-12-01), Philipp
patent: 5831404 (1998-11-01), Ishii

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