ELECTRIC TOOL
First Claim
1. An electric tool for driving a tip tool, the electric tool comprising:
- a removable battery;
a brushless motor configured to generate a driving force for driving the tip tool;
an inverter circuit configured to supply drive power from the removable battery to the brushless motor using a plurality of semiconductor switching elements;
a controller configured to control the inverter circuit to control rotation of the brushless motor;
a temperature detector configured to detect a temperature of the brushless motor or the semiconductor switching elements; and
a voltage detector configured to detect a voltage of the battery,wherein the brushless motor is driven such that a duty ratio of PWM drive signal for driving the semiconductor switching elements is determined based on relationship between the temperature detected by the temperature detector and the voltage detected by the voltage detector.
1 Assignment
0 Petitions
Accused Products
Abstract
An electric tool for driving a tip tool, the electric tool includes: a removable battery; the brushless motor configured to generate a driving force for driving the tip tool; an inverter circuit configured to supply drive power from the removable battery to the brushless motor using a plurality of semiconductor switching elements; a controller configured to control the inverter circuit to control rotation of the brushless motor; a temperature detector configured to detect a temperature of the brushless motor or the semiconductor switching elements; and a voltage detector configured to detect a voltage of the battery. The brushless motor is driven such that a duty ratio of PWM drive signal for driving the semiconductor switching elements is determined based on relationship between the temperature detected by the temperature detector and the voltage detected by the voltage detector.
110 Citations
12 Claims
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1. An electric tool for driving a tip tool, the electric tool comprising:
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a removable battery; a brushless motor configured to generate a driving force for driving the tip tool; an inverter circuit configured to supply drive power from the removable battery to the brushless motor using a plurality of semiconductor switching elements; a controller configured to control the inverter circuit to control rotation of the brushless motor; a temperature detector configured to detect a temperature of the brushless motor or the semiconductor switching elements; and a voltage detector configured to detect a voltage of the battery, wherein the brushless motor is driven such that a duty ratio of PWM drive signal for driving the semiconductor switching elements is determined based on relationship between the temperature detected by the temperature detector and the voltage detected by the voltage detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electric tool comprising:
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a motor; a battery configured to supply drive power to the motor; a voltage detector configured to detect a voltage of the battery; and an operating unit configured to reduce a duty ratio of PWM control signal supplied to the motor when the voltage of the battery is increased. - View Dependent Claims (10)
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11. An electric tool comprising:
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a motor; a removable battery configured to supply drive power to the motor; and an operating unit configured to reduce a duty ratio of PWM control signal supplied to the motor to a value less than 100% immediately after the battery is mounted to the electric tool. - View Dependent Claims (12)
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Specification