US 12,334,847 B2
Power converter apparatus
Kazuaki Tobari, Tokyo (JP); Hironori Ohashi, Tokyo (JP); Hiroshi Watanabe, Tokyo (JP); and Masato Ohya, Tokyo (JP)
Assigned to Hitachi Industrial Equipment Systems Co., Ltd., Tokyo (JP)
Appl. No. 18/273,844
Filed by Hitachi Industrial Equipment Systems Co., Ltd., Tokyo (JP)
PCT Filed Nov. 10, 2021, PCT No. PCT/JP2021/041409
§ 371(c)(1), (2) Date Jul. 24, 2023,
PCT Pub. No. WO2023/276181, PCT Pub. Date Jan. 5, 2023.
Claims priority of application No. 2021-107665 (JP), filed on Jun. 29, 2021.
Prior Publication US 2024/0079982 A1, Mar. 7, 2024
Int. Cl. H02P 21/26 (2016.01); H02P 21/14 (2016.01); H02P 21/22 (2016.01)
CPC H02P 21/26 (2016.02) [H02P 21/141 (2013.01); H02P 21/22 (2016.02)] 8 Claims
OG exemplary drawing
 
1. A power converter apparatus comprising:
a power converter that outputs a signal to a magnet motor to vary an output frequency, output voltage and output current of the magnet motor,
a control unit controls the power converter,
wherein the control unit is configured to
calculate a gain of a magnetic flux component of a q-axis, which varies with a phase of the magnet motor,
calculate a d-axis induced voltage command value based on a value of an induced voltage coefficient, frequency estimates or frequency command value, and the gain of the magnetic flux component of the q-axis,
calculate a gain of a magnetic flux component of the d-axis, which varies with the phase of the magnet motor, and
calculate a q-axis induced voltage command value based on a set value of the induced voltage coefficient, frequency estimates or frequency command value, and the gain of the d-axis magnetic flux component,
receive instructions on whether the magnet motor is to be driven by a sinusoidal drive or a square wave drive,
when the instruction indicates the sinusoidal drive,
the gain of the magnetic flux component of the q-axis is set to 0 and the gain of the magnetic flux component of the d-axis is set to 1,
when the instruction indicates the square wave drive,
obtain the gain of the magnetic flux component of the q-axis by computing as a sine function of a phase estimate value, and
obtain the gain of the magnetic flux component of the d-axis by computing as a sine function of a phase estimate value and subtracting a result of that calculation from 1.