US 12,021,460 B2
Displacement correction apparatus, magnetic levitation bearing system and displacement correction method thereof
Weilin Guo, Zhuhai (CN); Cong Zhao, Zhuhai (CN); Yongling He, Zhuhai (CN); Daofu Hu, Zhuhai (CN); Xue Li, Zhuhai (CN); and Jiandong Sun, Zhuhai (CN)
Assigned to GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI, Zhuhai (CN)
Filed by GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI, Zhuhai (CN)
Filed on Aug. 12, 2021, as Appl. No. 17/400,522.
Application 17/400,522 is a continuation of application No. PCT/CN2019/114741, filed on Oct. 31, 2019.
Claims priority of application No. 201910146759.3 (CN), filed on Feb. 27, 2019.
Prior Publication US 2021/0376775 A1, Dec. 2, 2021
Int. Cl. H02N 15/00 (2006.01); F16C 32/04 (2006.01); G01B 7/14 (2006.01)
CPC H02N 15/00 (2013.01) [F16C 32/0459 (2013.01); G01B 7/14 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A displacement correction apparatus, comprising:
a reference circuit, configured to provide a reference signal; and
a correction circuit, configured to perform a logarithm operation on a nonlinear displacement signal to be corrected, based on the reference signal, to obtain a corrected linear displacement signal,
wherein the nonlinear displacement signal to be corrected comprises an axial displacement signal of a magnetic levitation bearing detected by an eddy current sensor,
wherein in a case of performing a reference signal matching on the eddy current sensor,
the nonlinear displacement signal to be corrected comprises a minimum value of the axial displacement signal output by the eddy current sensor; and
an initial value of the reference signal comprises a set minimum reference signal.