To cope with some extraordinary working conditions, a three-phase asynchronous motor is required to start with a heavy load. However, a normal motor with a heavy load can easily cause the motor to burn out and even cause a broken shaft.So how does a three-phase asynchronous motor start with a heavy load?

　　The motor manufacturer has compiled the following essentials, focusing on the essentials of heavy-duty starting for the different series of three-phase asynchronous motors.

　　1. Heavy-load starting of ordinary three-phase asynchronous motors

　　The main problem of this environment is insufficient starting torque, and ordinary three-phase asynchronous motors are generally squirrel-cage type. The pace of handling is changed to extraordinary motors to obtain high starting torque. You may want the motor manufacturer to explain and organize the motor customization.

　　The rotor bar of the customized three-phase asynchronous motor can recover aluminum alloy with high resistivity. This kind of motor has strong overload capacity, but low power factor, large loss during normal operation, and low efficiency, so it is only suitable for frequent starting The place is mainly for lifting and transporting machinery.

　　It may also be possible to recover YKK high-power high-voltage motors. This type of motor operates with a large voltage effect to improve the starting function and guarantee the basic running function. However, the motor has a higher value and is generally used in places that require a higher starting torque.

　　2. Heavy-load starting of high-power three-phase asynchronous motors

　　In this environment, both a higher starting torque and a limited starting current are required. If the cage-type asynchronous motor with high starting torque cannot meet the requirements, the single-phase asynchronous motor can be recovered, and the corresponding resistance can be connected in series in the rotor circuit. It can increase the starting torque and reduce the starting current. Therefore, production machines that require large starting torque or frequent starting are often driven by winding-type asynchronous motors. High-power motors are generally of winding type.

　　The common starting essentials for high-power three-phase asynchronous motors are rotor string solid resistance, frequency-sensitive resistance or liquid resistance. High-power winding type asynchronous motor rotor string solid resistance starts, which cannot be adjusted steplessly, and the starting is not smooth.In order to reduce the attack, multi-level symmetrical resistors should be connected in series in the rotor circuit, and the starting resistors should be gradually removed as the speed increases. Therefore, the equipment investment is large and the operation and maintenance are not convenient.

　　YCT electromagnetic speed regulating motor can also be recycled. This type of motor has simple layout and convenient maintenance, and can be steplessly adjusted, but the starting current is large and the power factor is low, which limits the starting torque, but it needs to be equipped with a speed regulator. It can continuously adjust and make the motor start smoothly. It has the characteristics of large starting torque, small starting current, short starting time, high power factor, low noise, low temperature rise and simple layout.