US 11,837,982 B2
Rotary machine control device
Yuya Tanaka, Kanagawa (JP); and Tetsuya Matsuyama, Nara (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Apr. 19, 2022, as Appl. No. 17/724,308.
Claims priority of application No. 2021-076595 (JP), filed on Apr. 28, 2021; and application No. 2021-159326 (JP), filed on Sep. 29, 2021.
Prior Publication US 2022/0352837 A1, Nov. 3, 2022
Int. Cl. H02P 23/14 (2006.01); H02P 25/022 (2016.01)
CPC H02P 23/14 (2013.01) [H02P 25/022 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A rotary machine control device comprising:
a flux estimator that estimates a rotary machine flux that is a flux of a synchronous rotary machine;
a command amplitude specifier that generates a command amplitude that is an amplitude of a command flux, by executing feedback control using a first inner product or a second inner product, the first inner product being a product of an estimated flux that is the rotary machine flux estimated and a detected current of the synchronous rotary machine, the second inner product being a product of an estimated magnet flux of a permanent magnet of the synchronous rotary machine and the detected current;
a command flux specifier that generates the command flux using the command amplitude;
a switcher that controls switching from a current synchronous operation to a flux control operation, the current synchronous operation being an operation of supplying, regardless of a phase of the estimated flux, the synchronous rotary machine with a predetermined current for the current synchronous operation, the predetermined current for the current synchronous operation being a current for activating the synchronous rotary machine, the flux control operation being an operation of performing control to cause the estimated flux to be the command flux generated by the command flux specifier;
a torque estimator that calculates an estimated torque using the detected current and the estimated flux; and
a command phase specifier that calculates a torque phase for converging the estimated torque with a command torque,
wherein, when the switcher controls switching to the flux control operation, the flux estimator gives, to the feedback control, an amplitude of the estimated flux estimated before switching to the flux control operation, as an initial value of the command amplitude immediately after switching to the flux control operation,
the command flux specifier generates the command flux using the command amplitude and the torque phase that is calculated by the command phase specifier from the phase of the estimated flux, and
the rotary machine control device carries out, as the flux control operation, a position sensorless flux control operation that is performed based on the command flux.