US 12,424,953 B2
Electric working machine
Takeshi Nishimiya, Anjo (JP); and Hidekazu Suda, Anjo (JP)
Assigned to MAKITA CORPORATION, Anjo (JP)
Filed by MAKITA CORPORATION, Anjo (JP)
Filed on Dec. 22, 2022, as Appl. No. 18/086,811.
Application 18/086,811 is a continuation of application No. 16/462,675, granted, now 11,539,314, previously published as PCT/JP2017/042051, filed on Nov. 22, 2017.
Claims priority of application No. 2016-228009 (JP), filed on Nov. 24, 2016.
Prior Publication US 2023/0129772 A1, Apr. 27, 2023
Int. Cl. H02P 6/30 (2016.01); B23D 47/12 (2006.01); B23D 59/00 (2006.01); H02P 6/12 (2006.01); H02P 6/16 (2016.01); H02P 6/24 (2006.01); B23D 45/16 (2006.01); B23Q 11/00 (2006.01); B27G 19/04 (2006.01)
CPC H02P 6/30 (2016.02) [B23D 47/12 (2013.01); B23D 59/001 (2013.01); H02P 6/12 (2013.01); H02P 6/16 (2013.01); H02P 6/24 (2013.01); B23D 45/16 (2013.01); B23Q 11/0092 (2013.01); B27G 19/04 (2013.01)] 15 Claims
OG exemplary drawing
 
1. 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.