Electric driven tool device

Details Electric driven tool device Electric driven tool device

2007-09-11

2007-09-11

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S430000, C318S432000, C318S132000, C318S434000

Reexamination Certificate

active

10510693

ABSTRACT:
The invention relates to an electric driven tool device, especially an electric hand-held tool device, comprising an asynchronous electric motor (2) or a brush-less synchronous electric motor and a computer-controlled motor control device (8). The invention is characterized by a frequency converter (4) which can be controlled by the motor control device, whereby a motor (drive) voltage can be applied to the motor (2), and with a current detector (10) which co-operates with the motor control device (8) and detects the motor current. The motor control device (8) is embodied in such a manner that, in a first phase of the motor operation, the frequency of the motor current is maintained in a constant manner up to a limiting current I(grenz)and, in a second phase of the motor operation, at loads above the load at which the motor current reaches the limiting current I(grenz), the frequency of the motor current is lowered in such a manner that the motor current is maintained at a constant value.

REFERENCES:
patent: 6166502 (2000-12-01), Pattok
patent: 6646411 (2003-11-01), Hirono et al.
patent: 7042191 (2006-05-01), Hirono
patent: 2002/0117992 (2002-08-01), Hirono et al.
patent: 34 47 354 (1985-07-01), None
patent: 31 25 157 (1987-10-01), None
patent: 37 09 983 (1988-10-01), None
patent: 196 29 564 (1998-01-01), None
patent: 199 44 194 (2001-03-01), None
patent: WO99 03 193 (1999-01-01), None

Affiliated with

Also associated with

Rating

Electric driven tool device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electric driven tool device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric driven tool device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3733040