US 12,470,159 B2
Control device for synchronous motor
Tatsuya Senoo, Yamanashi (JP)
Assigned to Fanuc Corporation, Yamanashi (JP)
Appl. No. 18/279,271
Filed by Fanuc Corporation, Yamanashi (JP)
PCT Filed Mar. 22, 2022, PCT No. PCT/JP2022/013130
§ 371(c)(1), (2) Date Aug. 29, 2023,
PCT Pub. No. WO2022/202806, PCT Pub. Date Sep. 29, 2022.
Claims priority of application No. 2021-053884 (JP), filed on Mar. 26, 2021.
Prior Publication US 2024/0171097 A1, May 23, 2024
Int. Cl. H02P 6/16 (2016.01); H02P 6/185 (2016.01); H02P 6/28 (2016.01); H02P 6/32 (2016.01)
CPC H02P 6/185 (2013.01) [H02P 6/28 (2016.02); H02P 2207/05 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A control device for a synchronous motor comprising:
a processor configured to:
generate a command for passing direct current in a fixed current phase through the synchronous motor and control magnitude of the direct current in such a way as to apply, during execution of a direct current excitation operation by the direct current, deceleration torque to a rotor of the synchronous motor, based on at least either of angular acceleration and angular velocity of the rotor; and
acquire, as information representing a magnetic pole position, an angular position of the rotor based on an output signal of a position detector in the synchronous motor when a predetermined detection ending condition is satisfied.