Title:
METHOD FOR FITTING CONTROL CURVE OF MTPA OF PERMANENT MAGNET SYNCHRONOUS MOTOR
Document Type and Number:
WIPO Patent Application WO/2021/063293
Kind Code:
A1
Abstract:
Disclosed is a method for fitting a control curve of MTPA of a permanent magnet synchronous motor, belonging to the field of motor control. The method comprises: obtaining, in real time, motor parameters ψf, Ld and Lq of a permanent magnet synchronous motor, and making the output of a rotation speed regulator be equivalent to Is; on the basis of ψf, Ld and Lq, calculating a switching current Iswitch; and determining whether Is > Iswitch, and if so, using an asymptote to fit an id, iq relational expression, otherwise, using a parabola to fit the id, iq relational expression. The present invention proposes switching, according to the magnitude of a stator current amplitude, a fitting curve from a parabola to an asymptote when the current amplitude is Iswitch, using a parabola fitting curve when the stator current amplitude is relatively small, and using, when a stator current vector amplitude is relatively large, one of the standard MTPA curve asymptotes as an MTPA fitting curve under a large current amplitude to replace the parabola fitting curve, such that the MTPA control effect is close to the optimal control effect, so as to continue providing a high-output torque.
Inventors:
YIN QUAN (CN)
LUO HUI (CN)
HUANG XINGDI (CN)
LUO HUI (CN)
HUANG XINGDI (CN)
Application Number:
PCT/CN2020/118216
Publication Date:
April 08, 2021
Filing Date:
September 28, 2020
Export Citation:
Assignee:
UNIV HUAZHONG SCIENCE TECH (CN)
International Classes:
H02P21/22; H02P21/30
Foreign References:
| CN110707980A | 2020-01-17 | |||
| CN109286346A | 2019-01-29 | |||
| CN102857159A | 2013-01-02 | |||
| CN106655951A | 2017-05-10 |
Attorney, Agent or Firm:
HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY PATENT AGENCY CENTER (CN)
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