POWER TOOL HAVING A BRUSHLESS MOTOR AND A CONTROL UNIT FOR CONTROLLING THE BRUSHLESS MOTOR
First Claim
1. A power tool, comprising:
- a brushless motor;
a battery voltage detection unit configured to detect a voltage of a battery that provides energy for driving the brushless motor;
a rotational position detection unit configured to detect a rotational position of the brushless motor; and
a control unit configured to control a drive output supplied to the brushless motor based at least in part on a signal from the rotational position detection unit;
wherein,the control unit is configured to control a current conduction angle and/or an advance angle supplied to the brushless motor such that, during control of the drive output to the brushless motor, a rotational speed or a conducting current of the brushless motor reaches a target value based at least in part on a battery voltage detected by the battery voltage detection unit.
1 Assignment
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Accused Products
Abstract
A power tool according to one aspect of one embodiment described in the disclosure includes a brushless motor, a battery voltage detection unit configured to detect a voltage of a battery that provides energy for driving the brushless motor, a rotational position detection unit configured to detect a rotational position of the brushless motor, and a control unit configured to control a drive output supplied to the brushless motor based at least in part on a signal from the rotational position detection unit. The control unit controls a current conduction angle and/or an advance angle supplied to the brushless motor so that, during control of the drive output to the brushless motor, a rotational speed or a conducting current of the brushless motor approaches or reaches a target value, the target value being based at least in part on a battery voltage detected by the battery voltage detection unit.
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Citations
16 Claims
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1. A power tool, comprising:
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a brushless motor; a battery voltage detection unit configured to detect a voltage of a battery that provides energy for driving the brushless motor; a rotational position detection unit configured to detect a rotational position of the brushless motor; and a control unit configured to control a drive output supplied to the brushless motor based at least in part on a signal from the rotational position detection unit; wherein, the control unit is configured to control a current conduction angle and/or an advance angle supplied to the brushless motor such that, during control of the drive output to the brushless motor, a rotational speed or a conducting current of the brushless motor reaches a target value based at least in part on a battery voltage detected by the battery voltage detection unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power tool, comprising:
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a brushless motor having a rotor and having an input for receiving a control signal; a battery voltage detection unit configured to detect a voltage of a battery electrically connected to the brushless motor; a rotational position detection unit configured to detect a rotational position of the rotor of the brushless motor; and a control unit configured to send a control signal to the input of the brushless motor for controlling a current conduction angle or an advance angle or both a current conduction angle and an advance angle of the brushless motor, wherein, the control unit is configured to control the current conduction angle or the advance angle or both the current conduction angle and the advance angle such that a rotational speed or a conducting current of the brushless motor reaches a target value, wherein the target value is based at least in part on a battery voltage detected by the battery voltage detection unit. - View Dependent Claims (11)
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12. A method of controlling a power tool having a brushless motor and a battery for powering the brushless motor, the method comprising:
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detecting a voltage of the battery; detecting a rotational position of a rotor of the brushless motor; determining a target rotational speed or a target conducting current for the brushless motor based at least in part on the detected voltage of the battery; and controlling a current conduction angle and/or an advance angle of the brushless motor to cause a rotational speed of the brushless motor to reach the target rotational speed or to cause a conducting current of the brushless motor to reach the target conducting current. - View Dependent Claims (13, 14, 15, 16)
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Specification