Speed of 3000 r / min three-phase motor how to change its speed
Only the frequency converter to achieve the purpose of speed, because the rated voltage and frequency, the three-phase motor speed is determined by the motor within the pole pairs of pole number, but the frequency down, the speed decreases, plus a frequency converter, Can achieve the purpose of stepless speed regulation. The speed is calculated as: speed = (50 Hz * 60 seconds) / (number of poles / 2), the result is synchronous speed, the general asynchronous motor slightly lower than the synchronous speed. There is a change for the electromagnetic speed of the motor, but also to achieve the purpose of stepless speed regulation. If you have a fixed number of revolutions, you can consider buying a reducer and motor integrated, such as cycloid reducer, can also be installed between the motor and equipment reducer to achieve the purpose of deceleration.
The key lies in two points: 1, you ask the variable range is how much? 2, your motor had a few qualifying?
If your motor is 6 outlet, and you only need to speed, plus your motor is also an asynchronous motor, and you do not have the requirements of the load; then congratulations, you can achieve "speed" You just put the motor wiring way to do a △ - Y or Y - △ conversion can be achieved.
If the above conditions you have one or two can not meet, then your best way is to buy a drive to achieve the variable speed. Of course, you can also make some changes to the winding to achieve the so-called single-winding multi-speed operation (this change, but the need for a certain technical content).
Voltage regulator, variable pole speed, the best inverter speed. The
Speed of 3000 r / min three-phase motor speed:
Variable pole speed
Change the motor stator winding wiring way to change the motor pole number, which can be level to change the synchronous speed, to achieve a variable speed motor speed. This type of speed motor currently has a series of products to choose from, such as single-winding multi-speed motor.
Frequency
Change the asynchronous motor stator terminal input power frequency, and make it continuously adjustable to change its synchronous speed, to achieve the motor speed control method known as frequency control. The most energy efficient is the frequency conversion motor, but the need to install the inverter in the power part of the cost is too high.
