Electric rotating tool

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 9114519
APP PUB NO 20100307782A1
SERIAL NO

12867239

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A current detection circuit (18) detects that a drive current of the stator coil (2d) is exceeding a threshold value Ir. A rotation number detection circuit (17) detects that the number of rotations of a rotor (2a) is lower than a threshold value Nr. A computing part (20) outputs a PWM signal which switches a semiconductor switching element (3a) of the inverter circuit part (3). The computing part (20) changes the threshold values Ir and Nr in accordance with the PWM duty of the PWM signal determined in accordance with a pressed distance of a switch trigger (7) and detects a locked state of the motor (2) on the conditions that the motor current I is exceeding the set threshold value Ir and that the number of rotations N thereof is lower than the threshold value Nr.

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Patent Owner(s)

  • HITACHI KOKI CO., LTD.

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Iwata, Kazutaka Hitachinaka, JP 52 4827
Watanabe, Shinji Hitachinaka, JP 268 3157
Yoshida, Kenichirou Hitachinaka, JP 23 1098

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