The asynchronous motor with single-phase AC power supply is called single-phase asynchronous motor, in the stator, in addition to its working winding, there will be a starting winding, the difference between the two is 90°, in the wiring, the starting winding series capacitor, with the working winding in parallel on the AC power supply, when the difference of 90 read the current into the space is also 90° after the two windings, the rotating magnetic field is generated.

Energy consumption braking is a widely used electrical braking method. When the motor is separated from the three-phase AC power supply, the DC power supply is immediately connected to the two-phase winding of the stator, and the DC current flows through the winding to produce a stationary DC magnetic field. Below and three-phase asynchronous motor manufacturers Senli motor together to understand the next.

Feedback braking is one of the braking methods of frequency converter, and it is also a very effective energy-saving method. And avoid the damage to the environment and equipment during braking. When the rotor speed of the three-phase asynchronous motor is higher than the synchronous speed of the stator magnetic field, the direction of the electromagnetic torque is opposite to the rotor steering, and the motor both returns electrical energy and generates mechanical braking torque on the shaft, that is, it runs in the braking state.

In the production process, we often need to take some measures to make the three-phase asynchronous motor stop as soon as possible, or from a high speed to a low speed operation, or limit the potential energy load to run stably at a certain speed, which can be achieved by mechanical braking and electromagnetic braking.

The characteristic of constant torque load is that the load torque has nothing to do with the speed, and the torque always remains constant or basically constant at any speed. Constant torque speed regulation is used to characterize the load capacity of the variable frequency motor when adopting this speed regulation, and does not refer to the actual load of the motor.

Star triangle start needs to meet the 380V/Δ connection conditions of three-phase asynchronous motor, and the stator winding is connected into a triangle when the motor is running normally to adopt the star triangle start method. Star triangle start is a step-down start, which is achieved by reducing the starting current at the cost of sacrificing power. Therefore, it can not be generalized to the size of the three-phase asynchronous motor power to determine whether it is necessary to use the star triangle start, but also to see what kind of load.

Soft starting is to realize the smooth starting of three-phase asynchronous motor and mechanical load through technical means such as buck, compensation or frequency conversion, reduce the impact of starting current on the power grid, so that the power grid and mechanical system can be protected; The output torque meets the requirements of the mechanical system for starting torque, ensuring smooth acceleration, smooth transition, and avoiding the impact of destructive torque.

Autotransformer step-down starting is to reduce the starting voltage on the stator winding of the motor through the autotransformer, also known as autotransformer step-down starting. After the three-phase asynchronous motor is started, the motor is separated from the autotransformer, so as to move normally under full pressure.

Full voltage starting, also known as direct starting, is a common starting mode. The stator winding of three-phase asynchronous motor is directly connected to the power supply and started at rated voltage, which has the characteristics of large starting torque and short starting time. This starting mode is simple to operate and is a more reliable starting mode. The full voltage starting current is large, but the starting torque is small.

The common external faults of the motor are mainly manifested in the following aspects, and the method of discharging the fault. Senli Motor Xiaobian simply lists some. Below, we will understand the common faults of the three-phase asynchronous motor.