A kind of motor overheating protection method

Abstract

The invention relates to a motor overheating protection method, which is characterized by comprising the steps of first, starting a motor; second, judging whether there is a fault code or not, if so,executing the next step, and if not, repeating the step; third, judging whether the fault code is an overheating fault or not, if so, executing the next step, and if not, jumping to other troubleshooting procedures; fourth, comparing the temperature temp1 with a threshold temperature A, and controlling the operation state of the motor according to the following conditions: (4.1) if (temp1-A) is greater than [alpha], the motor is restarted after shutdown, and the process goes back to the second step; (4.2) if the abs(temp1-A) is greater than or equal to [beta] and less than or equal to [alpha],the speed of the motor is reduced, A is updated to temp2, and the fifth step is executed; and (4.3) if the abs(temp1-A) is less than [beta], the speed of the motor is reduced, A is maintained, and the fifth step is executed; fifth, calculating the new speed [omega]'; and sixth, enabling the motor to operate at the new speed [omega]' in a speed reduction manner, and returning to the second step. The motor overheating protection method realizes the detection for the motor temperature and the adjustment for the speed through software control, carries out detection and judgment without a need ofbuilding a hardware circuit or a built-in sensor and saves the cost; and the motor is controlled to operate at the maximum speed operating point allowed under the state of not triggering overheating protection, namely, shutdown restart, and the phenomenon of repeated restart caused by the shutdown once overheating occurs in the motor is solved.

Description

technical field [0001] The invention relates to a motor protection method, in particular to a DC motor overheat protection method. Background technique [0002] DC motors have the characteristics of low power consumption and low noise. Coupled with the maturity of control technology, DC motor control systems have good speed regulation performance, so they are more and more widely used in the field of industrial automation and household appliances. [0003] The motors in kitchen appliances are affected by the high-temperature and high-humidity environment of the kitchen, as well as overloaded operation under certain conditions, resulting in high heat during the operation of the motor, which is very prone to overheating protection. In order to protect the motor and prevent the motor from running overheated for a long time, the traditional method is to stop the motor for a period of time to dissipate heat, and then restart it again. For example, the existing Chinese invention ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an overheating protection method that is simpler to detect and can avoid repeated restarts of the motor due to overheating in view of the above-mentioned current state of the art

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