US 12,258,081 B2
Rotation angle detection device and electric power steering device including same rotation angle detection device
Tatsuya Mori, Tokyo (JP); and Akira Furukawa, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/417,290
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Jan. 22, 2019, PCT No. PCT/JP2019/001736
§ 371(c)(1), (2) Date Jun. 22, 2021,
PCT Pub. No. WO2020/152761, PCT Pub. Date Jul. 30, 2020.
Prior Publication US 2022/0063715 A1, Mar. 3, 2022
Int. Cl. B62D 5/00 (2006.01); B62D 5/04 (2006.01)
CPC B62D 5/0487 (2013.01) [B62D 5/0463 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A power steering system comprising:
a motor; and
a rotation angle detection device, the rotation angle detection device comprising:
a plurality of coils for detecting a sine signal and a cosine signal;
an intermediate signal generator using a processor to generate an intermediate signal based on a product of the sine signal and the cosine signal which are based on a rotation angle of a rotating body;
a first multiplication circuitry using the processor to multiply the intermediate signal by one of the sine signal or the cosine signal;
an addition/subtraction circuitry using the processor to add the other one of the sine signal or the cosine signal and an output of the first multiplication circuitry to each other or to subtract the output of the first multiplication circuitry from the other one of the sine signal or the cosine signal; and
a first rotation angle calculator using the processor to calculate the rotation angle of the rotating body based on the one of the sine signal or the cosine signal and on an output of the addition/subtraction circuitry;
wherein the rotation angle detection device provides an input for a voltage command, the voltage command being applied to the motor to control the motor, wherein the voltage command is based on the rotation angle, and the motor is the rotating body.