How can I know the connection method of the universal motor wire?
One way is that one end of the three-phase windings is connected, and the other end is connected to the three-phase power supply, which is shaped like the letter "y"; the delta connection method is that the three-phase windings are connected end to end to form a "△" shape, and the top of the triangle is connected to the three-phase power supply. .
Their phase voltages are different. Generally, the rated voltage of the star-connected motor is 220v, and the rated voltage of the delta connection is 380v. The connection method is generally marked on the inside and outside of the cover plate of the junction box, and different connection methods correspond to different power supply voltages.
How does the number of poles of the motor affect its selection?
The more pole pairs of the motor, the lower the speed of the motor, but the greater its torque; when choosing a motor, you should consider how much starting torque the load needs, such as starting with a load than no-load The torque required for starting is large. If it is a high-power and large-load starting, the step-down starting (or star-delta starting) should also be considered;
As for the problem of matching the speed of the motor with the load after the number of pole pairs of the motor is determined, it is possible to consider using pulleys of different diameters to drive or use variable speed gears (gearboxes) to match. If the power requirement of the load cannot be met after the belt or gear drive is determined after the number of pole pairs of the motor is determined, then the use power of the universal motor must be considered.
