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Title:
METHOD AND APPARATUS FOR ESTIMATING ROTOR POSITION OF ELECTRIC MOTOR, AND ELECTRIC MOTOR CONTROL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/155864
Kind Code:
A1
Abstract:
A method and apparatus for estimating a rotor position of an electric motor, and an electric motor control system. The method comprises: obtaining a position error signal by means of injecting a high-frequency signal into a stator winding of an electric motor (S1); acquiring a load parameter for indicating a load of the electric motor, acquiring a direct-current component disturbance value according to the load parameter and a first preset relationship, acquiring a harmonic component disturbance value according to the load parameter and a second preset relationship, and acquiring an observer parameter value according to the load parameter and a third preset relationship (S2); compensating for the position error signal according to the direct-current component disturbance value and the harmonic component disturbance value so as to obtain a compensated position error signal (S3); and adjusting a parameter of an observer according to the observer parameter value, and adjusting the compensated position error signal by means of the adjusted observer so as to obtain a rotor position and a rotor speed (S4). Thus, the method for estimating a rotor position can solve the problems of position estimation precision and reliability brought about by a change in the saliency effect of an electric motor along with a load.

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Inventors:
XU PEILIN (CN)
LIU YI (CN)
Application Number:
PCT/CN2019/124314
Publication Date:
August 06, 2020
Filing Date:
December 10, 2019
Export Citation:
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Assignee:
GUANGDONG MIDEA WHITE HOME APPLIANCE TECH INNOVATION CENTER CO LTD (CN)
MIDEA GROUP CO LTD (CN)
International Classes:
H02P21/18
Foreign References:
CN108336937A2018-07-27
CN107171610A2017-09-15
US8169172B22012-05-01
CN107959446A2018-04-24
Other References:
See also references of EP 3905513A4
Attorney, Agent or Firm:
TSINGYIHUA INTELLECTUAL PROPERTY LLC (CN)
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