US 12,128,967 B2
Control apparatus for AC rotary machine and electric power steering apparatus
Tatsuya Mori, Tokyo (JP); Kenta Kubo, Tokyo (JP); Itaru Iki, Tokyo (JP); and Yu Hirotani, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/778,291
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Jan. 15, 2020, PCT No. PCT/JP2020/000942
§ 371(c)(1), (2) Date May 19, 2022,
PCT Pub. No. WO2021/144867, PCT Pub. Date Jul. 22, 2021.
Prior Publication US 2023/0001979 A1, Jan. 5, 2023
Int. Cl. B62D 5/04 (2006.01); H02P 27/08 (2006.01)
CPC B62D 5/046 (2013.01) [B62D 5/0487 (2013.01); H02P 27/08 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A control apparatus for AC rotary machine that controls an AC rotary machine which has three-phase windings, the control apparatus for AC rotary machine comprising:
an inverter that is provided with three sets of series circuits in each of which a positive electrode side switching device connected to a positive electrode side of a DC power source and a negative electrode side switching device connected to a negative electrode side of the DC power source are connected in series and a connection node of series connection is connected to the winding of the corresponding phase, corresponding to respective phases of the three-phase windings;
a current detection circuit that is provided with resistances connected in series to the negative electrode side switching devices of at least two phases; and
a controller that calculates voltage command values of the three-phases, and controls on/off the switching devices by comparing each of the voltage command values of three-phase with a carrier wave vibrating at a carrier period,
wherein the controller detects currents flowing into the three-phase windings, based on an output signal of the current detection circuit, at every current detection timing which is set every current detection period which is a first natural number times of the carrier period and at which the negative electrode side switching device is turned on; calculates current detection values after current addition processing, by performing a current addition processing which adds current detection values detected at a present current detection timing, and current detection values detected at a first past current detection timing, wherein the first past current detection timing is before the present current detection timing by an addition period which is a second natural number times of the current detection period; and calculates the voltage command values of the three-phases based on the current detection values after the current addition processing,
wherein the second natural number is set so that the addition period becomes closest to a half period of a mechanical resonance period of the AC rotary machine.