When the three-phase asynchronous motor is running on the mechanical equipment, its speed is lower than the rotating magnetic field speed, the rotor winding because of the relative motion between the magnetic field and induced electromotive force and current, and interact with the magnetic field to produce electromagnetic torque, to achieve energy conversion. Here is a simple understanding with Senli Motor Xiaobian, about the speed change method of three-phase asynchronous motors.
Three-phase asynchronous motor with easy to use and maintenance, long life and other characteristics have a very wide range of applications, in some production processes, often require the motor under the same load has different speeds, the following is introducedThree-phase asynchronous motorSeveral ways to achieve variable speed:
First, pole change speed regulation
The speed regulation method is to change the stator pole number of the cage motor by changing the connection mode of the stator winding to achieve the purpose of speed regulation. The characteristics are as follows: it has hard mechanical characteristics and good stability; No slip loss, high efficiency; Simple connection, convenient control, low price.
Step speed regulation, the step difference is large, can not get smooth speed regulation; It can be used with voltage regulation and electromagnetic slip clutch to obtain smooth speed regulation characteristics. This method is applicable to production machinery that does not require stepless speed regulation, such as metal cutting machine tools, elevators, lifting equipment, fans, pumps, etc.
Second, frequency control
Speed regulation is to change the frequency of the motor stator power supply, so as to change its synchronous speed regulation method.
The main equipment of the frequency conversion speed regulation system is the frequency converter that provides the frequency conversion power supply, and the frequency converter can be divided into AC－Direct current－Ac inverter and AC－Ac inverter two categories, most of the current domestic use－straight－Ac frequency converter.
Its features: high efficiency, no additional loss in the process of speed regulation; Wide application range, can be used in cage asynchronous motor; Large speed range, hard characteristics, high precision; The technology is complicated, the cost is high, and the maintenance is difficult. This method is suitable for occasions requiring high precision and good speed regulation performance.
Three-phase asynchronous motor manufacturers, Senli Motor,19Focus on the development and production of electric motors. Available if needed1688Search factory name "Shengzhou Chaoli Electric Appliance Factory" , Or online consultation message, we will have business personnel to get in touch with you, you can also contact us directly0575-8378-1127.