US 12,009,767 B2
Motor control device, motor control method, and motor unit
Ryo Ohori, Gunma (JP); Naoki Shioda, Gunma (JP); Masaki Hayata, Gunma (JP); Takashi Yatsuda, Gunma (JP); and Atsushi Kawasaki, Gunma (JP)
Assigned to MITSUBA Corporation, Gunma (JP)
Appl. No. 17/442,576
Filed by MITSUBA Corporation, Gunma (JP)
PCT Filed Mar. 26, 2020, PCT No. PCT/JP2020/013643
§ 371(c)(1), (2) Date Sep. 23, 2021,
PCT Pub. No. WO2020/196744, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-059243 (JP), filed on Mar. 26, 2019.
Prior Publication US 2022/0190756 A1, Jun. 16, 2022
Int. Cl. H02P 6/16 (2016.01); B60J 7/057 (2006.01); B60S 1/08 (2006.01)
CPC H02P 6/16 (2013.01) [B60J 7/0573 (2013.01); B60S 1/08 (2013.01); H02P 2209/07 (2013.01); H02P 2209/11 (2013.01); H02P 2209/13 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A motor control device, which controls a brushless motor comprising a rotor and a three-phase armature coil of U-phase, V-phase, and W-phase, comprising:
a position detection unit which detects a rotational position of the rotor;
a control unit capable of selecting a first control mode and a second control mode, and which
outputs, in the first control mode, a first drive signal to an inverter at a current-supply timing based on the rotational position of the rotor, and
outputs, in the second control mode, a second drive signal to the inverter at the current-supply timing based on the rotational position of the rotor; and
the inverter which outputs, in the first control mode, a first current-supply signal as an applied voltage applied to the three-phase armature coil, and
outputs, in the second control mode, a second current-supply signal as the applied voltage applied to the three-phase armature coil; wherein
for any two of the three phases, when a duty of the applied voltages becomes the same, a duty value in the second control mode is larger than a duty value in the first control mode, wherein
the first current-supply signal has
a waveform which is a third harmonic with a frequency that is triple of a fundamental frequency of a sine wave, and
the second current-supply signal has
a waveform which comprises, in the waveform which is the third harmonic with the frequency that is triple of the fundamental frequency of the sine wave,
a first overlap section between a section where only the duty of the applied voltage of the U-phase among the three phases is 100% and a section where only the duty of the applied voltage of the V-phase among the three phases is 100%, in which both the duty of the applied voltage of the U-phase and the duty of the applied voltage of the V-phase are 100%;
a second overlap section between the section where only the duty of the applied voltage of the V-phase among the three phases is 100% and a section where only the duty of the applied voltage of the W-phase among the three phases is 100%, in which both the duty of the applied voltage of the V-phase and the duty of the applied voltage of the W-phase are 100%; and
a third overlap section between the section where only the duty of the applied voltage of the W-phase among the three phases is 100% and the section where only the duty of the applied voltage of the U-phase among the three phases is 100%, in which both the duty of the applied voltage of the W-phase and the duty of the applied voltage of the U-phase are 100%.