Home appliance and control method thereof

By setting a controller in the permanent magnet synchronous motor and switching the field weakening control mode according to the actual speed and the preset speed threshold, the problems of slow response and limited speed increase of the permanent magnet synchronous motor at high speed are solved, and fast response and high speed permanent magnet synchronous motor control are realized.

CN116995977BActive Publication Date: 2026-07-21HISENSE HOME APPLIANCES GRP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HISENSE HOME APPLIANCES GRP CO LTD
Filing Date
2023-08-11
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

In the existing technology, permanent magnet synchronous motors cannot meet the high speed requirements when running at high speeds. In particular, after the current increases, the speed is limited by the permanent magnet torque output and cannot be further increased by field weakening control. Moreover, the existing control methods have a slow response and cannot meet the high speed requirements of household appliances.

Method used

By setting a controller in the permanent magnet synchronous motor, the first field weakening control and the second field weakening control are switched according to the actual speed and the preset speed threshold, so as to achieve adaptive switching, ensure a fast response within the preset speed threshold, and further weaken the field when the threshold is exceeded to increase the speed.

Benefits of technology

The permanent magnet synchronous motor achieves fast and timely response within a preset speed threshold, and can further weaken the magnetism under extreme conditions to meet higher speed requirements, thus solving the problems of slow response and limited speed increase in the existing technology.

✦ Generated by Eureka AI based on patent content.

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    Figure CN116995977B_ABST
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Abstract

The application provides a household appliance and a control method thereof. The household appliance comprises a shell, a permanent magnet synchronous motor and a controller. The permanent magnet synchronous motor is arranged in the shell and is used for performing speed control of the permanent magnet synchronous motor according to a direct current input voltage. The controller is configured to acquire an actual speed of the permanent magnet synchronous motor, judge whether the permanent magnet synchronous motor satisfies a condition of field weakening control, and control the permanent magnet synchronous motor to switch between first field weakening control and second field weakening control according to the actual speed of the permanent magnet synchronous motor and a preset speed threshold when the permanent magnet synchronous motor satisfies the condition of field weakening control. The application enables the permanent magnet synchronous motor to quickly respond within the preset speed threshold when the permanent magnet synchronous motor is in the first field weakening control, and the timeliness is good. When the permanent magnet synchronous motor is in the second field weakening control, the permanent magnet synchronous motor can further weaken the field in the extreme case of exceeding the preset speed threshold, the speed of the permanent magnet synchronous motor is improved, and higher speed requirements are met.
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