Motor speed control issue

It is not feasible to use the thermocouple installed on the motor directly to control its speed, as a thermocouple is a temperature sensor designed for measuring temperature, not for controlling speed. The control of motor speed typically involves the following methods: 1. Changing the power supply frequency (for AC motors): An inverter (also known as a variable frequency drive) can adjust the power supply frequency, thereby controlling the speed of synchronous and asynchronous AC motors. 2. Changing the supply voltage (for DC motors): By adjusting the voltage supplied to the motor, its speed can be controlled, as the speed of a DC motor is proportional to its armature voltage. 3. Use of an electronic control unit (ECU): The electronic control unit can control the speed of the motor by adjusting its power supply parameters as needed. 4. Use transmission mechanical systems: such as belt drives and gearboxes, which can change the rotational speed of the output shaft. Although thermocouples cannot be used directly to control the motor speed, they can be employed to monitor the operating temperature of the motor, ensuring that it is not damaged due to overheating. If the motor overheats, it may indicate that the motor is overloaded or inefficient; in such cases, it might be necessary to adjust the speed in order to protect the motor. Therefore, the data from thermocouples can be used indirectly in motor management systems to help optimize motor operating parameters, including the adjustment of speed. .

The rotation speed needs to be controlled by an inverter; typically, closed-loop regulation can be achieved based on parameters such as the pressure and flow rates at the inlet and outlet of the process pipeline. Motor temperature is an indicator used to monitor the operation of a motor. Furthermore, motors generally cannot operate unloaded for long periods of time. There are requirements.

It’s not realistic; there isn’t a strong corresponding relationship

The thermocouple provides a digital signal – either an alarm is triggered or it is not. The motor speed is controlled by an inverter, and the speed is adjusted according to the process requirements

This post was last edited by zhouds on 2023-12-7 11:23. It is achievable. One end of the thermocouple is fixed to the motor’s casing, while the other end is connected to the control system. The set temperature should be determined based on the specific conditions of the motor; it must not be too high or too low, in order to avoid affecting the motor’s normal operation.