US 11,705,847 B2
Drive device for AC motor, compressor drive device, and refrigeration cycle device
Kenji Takahashi, Tokyo (JP); Yuki Taniyama, Tokyo (JP); Hiroyuki Kamiko, Tokyo (JP); and Toshiyuki Kaitani, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/772,551
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Jan. 14, 2020, PCT No. PCT/JP2020/000909
§ 371(c)(1), (2) Date Apr. 28, 2022,
PCT Pub. No. WO2021/144856, PCT Pub. Date Jul. 22, 2021.
Prior Publication US 2022/0407444 A1, Dec. 22, 2022
Int. Cl. H02P 23/14 (2006.01); F25B 31/02 (2006.01)
CPC H02P 23/14 (2013.01) [F25B 31/026 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A drive device for an AC motor, the drive device comprising:
an adaptive observer to adaptively estimate an angular velocity of a rotor of an AC motor that drives a mechanical device having periodic load torque pulsations;
a speed control circuitry to determine a first torque command with which an angular velocity command matches an average value of an estimated angular velocity;
a phase lead amount calculation circuitry to calculate, based on a disturbance frequency, a phase lead amount of a transfer function from a true angular velocity to a model deviation that is an internal quantity of the adaptive observer;
a vibration suppression controller to determine, based on a frequency of the load torque pulsations, the model deviation, and the phase lead amount, a second torque command with which speed pulsations in the AC motor are suppressed; and
a torque control circuitry to control a torque of the AC motor based on the first torque command and the second torque command.