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1. (US20140117892) Speed control for power tools

Office : United States of America
Application Number: 14125225 Application Date: 20.06.2011
Publication Number: 20140117892 Publication Date: 01.05.2014
Grant Number: 09257925 Grant Date: 09.02.2016
Publication Kind : B2
Prior PCT appl.: Application Number:PCTGB2011051149 ; Publication Number: Click to see the data
IPC:
B60K 6/36
H02P 7/06
A01D 69/02
B25F 5/00
B PERFORMING OPERATIONS; TRANSPORTING
60
VEHICLES IN GENERAL
K
ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS; AUXILIARY DRIVES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST, OR FUEL SUPPLY, OF PROPULSION UNITS, IN VEHICLES
6
Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines
20
the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
22
characterised by apparatus, components or means specially adapted for HEVs
36
characterised by the transmission gearings
H ELECTRICITY
02
GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
P
CONTROL OR REGULATION OF ELECTRIC MOTORS, GENERATORS, OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS OR REACTORS OR CHOKE COILS
7
Arrangements for regulating or controlling the speed or torque of electric dc-motors
06
for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
A HUMAN NECESSITIES
01
AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
D
HARVESTING; MOWING
69
Driving mechanisms or parts thereof for harvesters or mowers
02
electric
B PERFORMING OPERATIONS; TRANSPORTING
25
HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; HANDLES FOR HAND IMPLEMENTS; WORKSHOP EQUIPMENT; MANIPULATORS
F
COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
5
Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
Applicants: Neil Coates
HUSQVARNA AB
Inventors: Neil Coates
Agents: Nelson Mullins Riley & Scarborough LLP
Priority Data:
Title: (EN) Speed control for power tools
Abstract: front page image
(EN)

A power tool, typically battery-operated, such as a lawnmower, comprising: a driven element (9), an electric motor (7) coupled to the driven element so as to drive the driven element, an electric power source (2) electrically coupled to the motor (7) so as to supply electric current to the motor (7) and a control circuit (3) arranged to control the supply of electric current to the motor (7) from the power source (2), and a current sensor (6) operable to output a current signal indicative of the current flowing through the motor (7); in which the control circuit (3) has a high speed mode (40) and a low speed mode (32), the control circuit (3) being arranged so that: when it is in the high speed mode (40), the control circuit supplies electric current to the motor (7) so as to attempt to drive the driven element (9) at a first desired speed (54); when it is in the low speed mode (32), the control circuit supplies electric current to the motor (7) so as to attempt to drive the driven element (9) at a second desired speed (52) which is lower than the first desired speed (54); and the control circuit (3) switches between the high speed mode (40) and the low speed mode (32) dependent on the current signal. As such, energy can be saved by efficient use of electrical power, by increasing the speed of the driven element when the load increases.


Also published as:
EP2720526WO/2012/175901