The purpose of no-load test is to check the assembly quality and operation of three-phase asynchronous motor, and to measure the no-load current and no-load loss power of motor. The motor gradually increases the voltage to the rated value (380V), at which time the motor should operate stably without abnormal noise and vibration. The value measured by the ammeter is the no-load current, and the input power value displayed by the power meter is the no-load loss power of the motor. The no-load current should be balanced in three phases, and the average deviation between any phase no-load current and three-phase current should not be greater than 10%. The percentage of no-load current and rated current should conform to the values listed in the following table

In the production process of some textile, paper, metal processing, plastics and other industries, it is often necessary to wind the product on the drum or reel operation, here a problem that needs to be solved: how to keep the change of tension and line speed within the allowed range during the process of gradually increasing the drum diameter from the beginning to the back. Torque motor can just perfectly solve this kind of problem, which is one of its characteristics.

In some previous articles also mentioned a lot of maintenance and maintenance of three-phase asynchronous motor methods, only do a good job of daily basic maintenance measures to make the motor run longer. Follow Senli Motor Xiaobian to learn today's content.

We know that torque motors can be used for winding operations and unwinding operations, so what occasions can these characteristics be applied to, and how can they be rotated? Today, Senli Motor Xiaobian will take you to understand the common applications of torque motors.

Sometimes we call the torque motor is also called the torque motor, because the rotational torque is also called torque or torque, then do you know what is called limited angular force? Today, with Senli Motor Xiaobian to understand.

If our three-phase asynchronous motor is used after long-term idle, repair and maintenance, then it must go through the necessary inspection and test before use. Today, follow Senli Motor Xiaobian to briefly understand the insulation test.

When we use three-phase asynchronous motor equipment, direct starting is commonly used and simple starting mode, but this way is too "rough", starting the motor directly connected to the grid through the knife or contactor, it is simple, but you know what, the faster the starting speed, the greater the harm. The following Senli motor Xiaobian will explain the harm of direct starting of the motor:

The control of the torque motor is to adjust the power supply and voltage according to different needs, in order to adapt to different load requirements, this is any voltage regulator can be applied, but the power of the voltage regulator needs to be selected according to the current demarcated by the motor nameplate, and this speed range is very important when we use the motor.

The primary condition for a three-phase asynchronous motor to rotate is to have a rotating magnetic field, and the stator winding is used to generate a rotating magnetic field. We can change the steering according to its operating principle, just switch any two of the three power lines of the motor to change the three-phase current phase sequence into the motor, and follow the Senli motor Xiaobian together to understand.

Because of the different design parameters, the mechanical characteristics and uses of the torque motors we use are divided into two categories: winding characteristics and constant torque characteristics. The following Mori Power small series will take you to a brief understanding of the characteristics of these two characteristics.