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        • 電動執行機構
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        首頁 > 技術文章 > 電動執行器為什么總顯示過力矩?



        Why do electric actuators always show over torque?


          Why do electric actuators always show over torque?How to use electric actuator safely?The Sino-British joint venture Tandy Valve will explain it to you in detail.


          When the specification of the electric actuator is determined, the control torque is also determined.When it runs in a predetermined period of time, the motor is generally not overloaded. However, it will be overloaded if : 


          1. Low supply voltage, can not get the required torque, so that the motor stops turning.


          2. The torque limiting mechanism is set incorrectly so that it is greater than the stopping torque, resulting in the continuous generation of excessive torque, so that the motor stops turning.


          3. If the intermittent use of the point move, the heat generated by the savings, exceeding the allowable temperature appreciation of the motor. 


          4.For some reason, the circuit of torque limiting mechanism breaks down and the torque is too large.


          5. The use of ambient temperature is too high, relative to the heat capacity of the motor decreased. 

          These are some of the causes of overload, for these reasons the phenomenon of motor overheating should be considered in advance, and take measures.Prevent overheating.


          In the past, the electric motor for electric actuators was protected by fuses, overcurrent relays, thermal relays, thermostats, etc, But these methods also have their advantages and disadvantages, for the electric device such as the variable load equipment, absolutely reliable protection method is not available. It is therefore necessary to adopt a combination of approaches. However, due to the different load conditions of each electric device, it is difficult to propose a unified approach. But in most cases, common ground can also be found.


          There are two types of overloading protection:


          1. Judging the increase or decrease of the input current of the motor in the valve electric device;


          2. Judge the heating of the motor itself.


          The above two methods, regardless of the kind of motor heat capacity should be considered a given time margin. It is difficult to match the heat capacity characteristics of the motor in a single way. So should choose according to the reason of overload can reliable action method-combination compound way, in order to realize the comprehensive overload protection effect.


          The special motor for electric actuator of the Sino-British joint venture Tandy Valve, because it has a thermostat embedded in the winding, which has the same insulation level as the motor, reaches the rated temperature.The motor control circuit will be cut off. The thermostat itself has a smaller heat capacity, and its time-limited characteristic is determined by the heat capacity characteristics of the motor, so this is a reliable method. 


          The basic protection methods for overload of valve electric devices are:


          1. Use a thermostat for over-load protection of the continuous operation or point operation of the motor;

          2. Use thermal relay to protect the motor;

          3. Use fuses or overcurrent relays for short-circuit incidents.