Harvesters – Motorized harvester – With condition-responsive operation
Patent
1996-11-22
1999-05-25
Nicholson, Eric K.
Harvesters
Motorized harvester
With condition-responsive operation
56 108, 56 119, A01D 7528, A01D 6900
Patent
active
059060883
ABSTRACT:
A battery driven electric lawn mower includes a DC motor, and mowing blade on an output shaft of the motor. A control unit is connected between the motor and the battery for increasing and decreasing the electric current supplied to the motor in accordance with an increase and decrease in load, to thereby maintain the number of revolutions per second of the motor substantially constant at or near a minimum value permitting a mowing blade to function normally under a heavy load. The control unit comprises an electric current detecting device for detecting a load current flowing in the motor, and a pulse generating device for outputting a pulse signal having a pulse width corresponding to an electric current value detected by the electric current detecting device. A pulse-responsive switch device for adjusting the electric current supplied to the motor in response to a pulse signal output from the pulse generating device. The pulse responsive switch device is connected in series with the motor. A duty ratio of the pulse signal output from the pulse generating device is increased in accordance with an increase in electric current detected by the electric current detecting device.
REFERENCES:
patent: 4673851 (1987-06-01), Disser
patent: 4987729 (1991-01-01), Paytas
patent: 5412293 (1995-05-01), Minezawa
patent: 5442901 (1995-08-01), Niemela et al.
patent: 5502957 (1996-04-01), Robertson
Inui Tsutomu
Shimizu Norikazu
Grafel Gary
Honda Giken Kogyo Kabushiki Kaisha
Nicholson Eric K.
LandOfFree
Electric lawn mower 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 lawn mower, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric lawn mower will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-395893