Electric working machine
AssigneeMakita Corporation
InventorsTakeshi Nishimiya, Hidekazu Suda
Life of this patent
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Abstract
An electric working machine in one aspect of the present disclosure includes: a motor; a driver to drive the motor; a first control circuit; and a second control circuit. The first control circuit controls the driver such that the motor rotates in a set rotation direction. The second control circuit is provided separately from the first control circuit. The second control circuit detects a rotation direction of the motor and performs an abnormality handling process to stop rotation of the motor in response to a situation where the detected rotation direction is reverse to the set rotation direction.
Claims15
An electric working machine comprising:
- a motor configured to drive a tool;
- a drive circuit electrically connected to a power supply and to the motor so as to drive the motor;
- a signal output circuit configured to output a position signal, the position signal varying according to a rotational position of the motor;
- a first control circuit electrically connected to the signal output circuit, the first control circuit being configured to (i) receive the position signal from the signal output circuit and (ii) output a first signal to the drive circuit based on the position signal received, the first signal commanding the drive circuit to rotate the motor in a first direction;
- a second control circuit electrically connected to the signal output circuit, the second control circuit being configured to (i) receive the position signal from the signal output circuit, (ii) detect an actual rotation direction of the motor based on the position signal received, and (iii) output a second signal based on the actual rotation direction corresponding to a second direction, the second direction being reverse to the first direction;
- and
- an interrupter (i) on a first wire and (ii) electrically connected to the second control circuit, the first wire being electrically connected to the first control circuit and/or to the drive circuit, the interrupter being configured to (i) receive the second signal from the second control circuit and (ii) electrically interrupt the first wire based on having received or receiving the second signal.
Dependencies are inferred from the claim text.