Electric tool
First Claim
1. An electric tool which is a cordless electric tool comprising a motor, an output shaft connected to the motor via a speed changing device, a motor driving circuit and a control portion of the driving circuit and using a charge type battery as a drive power source:
- wherein the motor is a brushless direct current motor.
1 Assignment
0 Petitions
Accused Products
Abstract
To provide a cordless electric tool promoting a fastening function or a cutting function by facilitating to control a rotational number of a motor from a low speed region to a high speed region, reducing generation of vibration or noise and achieving small-sized formation and light-weighted formation, there is provided a cordless electric tool constituted by a brushless direct current motor 3, an output shaft 5 connected to the brushless direct current motor 3 via a speed changing device 4, a motor driving circuit 7 and a control portion 8 of the driving circuit and using a charge type battery 11 as a drive power source.
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Citations
3 Claims
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1. An electric tool which is a cordless electric tool comprising a motor, an output shaft connected to the motor via a speed changing device, a motor driving circuit and a control portion of the driving circuit and using a charge type battery as a drive power source:
wherein the motor is a brushless direct current motor. - View Dependent Claims (3)
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2. An electric tool comprising:
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a brushless direct current motor constituting a power source of the electric tool;
a first operating member for changing a maximal rotational speed of the brushless direct current motor;
a second operating member for changing a rotational speed of the brushless direct current motor within a range of the maximal rotational speed of the brushless direct current motor set by the first operating member; and
controlling means for controlling a rotational state of the brushless direct current motor;
wherein the controlling means comprises;
maximal rotational speed signal outputting means for outputting a maximal rotational speed signal in correspondence with a displacement of the first operating member; and
rotational speed signal outputting means for constituting a maximal level by the maximal rotational speed signal outputted from the maximal rotational speed signal outputting means and outputting a rotational speed signal in correspondence with a displacement of the second operating means to thereby drive to rotate the brushless direct current motor.
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Specification