Title:
METHOD FOR DETERMINING STALLED STATE OF PERMANENT MAGNET SYNCHRONOUS MOTOR UNDER POSITION SENSOR-FREE VECTOR CONTROL
Document Type and Number:
WIPO Patent Application WO/2021/068471
Kind Code:
A1
Abstract:
Disclosed is a method for determining the stalled state of a permanent magnet synchronous motor under position sensor-free vector control, which comprises the following steps: step A: calculating the input power Pin and output power Pout of a motor; step B: calculating an error value ERR＝|Pin-K1×Pout|, where K is a coefficient; step C: determining whether the ERR is greater than or equal to a certain preset value P0, and if so, then returning to step A; if not, determining that the motor is in a stalled state, and proceeding to step D; step D: a microprocessor of the motor locks out a pulse signal outputted to an inverter. The described method may accurately determine a motor changing into a stalled state, and still prevents the motor from entering a steady-state closed loop state when changed into the stalled state, which enables the motor to be in a high-frequency small-amplitude oscillation state, perfects a protection strategy, effectively protects the motor, essentially solves the problem of determining the stalled state, and does not require modifications once a load is replaced, which brings great convenience to a user.
Inventors:
LAN JINGHAO (CN)
BIAN WENQING (CN)
BIAN WENQING (CN)
Application Number:
PCT/CN2020/084034
Publication Date:
April 15, 2021
Filing Date:
April 09, 2020
Export Citation:
Assignee:
ZHONGSHAN BROAD OCEAN MOTOR CO (CN)
International Classes:
H02P21/14; H02P21/24
Foreign References:
| CN110518857A | 2019-11-29 | |||
| CN105429526A | 2016-03-23 | |||
| CN101383583A | 2009-03-11 | |||
| JPH05146055A | 1993-06-11 |
Attorney, Agent or Firm:
ZHONGSHAN HANTONG INTELLECTUAL PROPERTY AGENCY (GENERAL PARTNERSHIP) (CN)
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