How many poles does the rotor of AC inverter motor have, and the speed of the 2 pole motor?

There are several poles. But relatively speaking, it started from 4 poles, developed to 2 poles, and now developed to several poles, which not only refers to the number of poles of the rotor, but also the stator is no exception. From the 2 poles of the water pump industry to the steel mill roller table and rolling mill motors, there are 10 poles and 12 poles.

There are several poles, as long as the ordinary motor has it, there is a frequency conversion one.

The number of poles is directly related to the speed of your motor, in the case of no load, the speed n=60f p, where n is the speed per minute, f is the frequency of electricity, p is the number of pole pairs you said, note that it is the number of pole pairs, that is, two poles are a pair of poles.

The output speed of the motor is different for different levels, so what is the commonly used motor level and speed, and what is the output speed of the common 2-level motor, 4-level motor and 6-level motor on the market.

1. Four commonly used motors and speed sizes.

1) The output speed of the 2-stage motor is 2900-3000 rpm.

2) The output speed of the 4-stage motor is 1400-1500 rpm.

3) The output speed of the 6-stage motor is 900-1000 rpm.

4) The output speed of the 8-stage motor is 750 rpm.

Second, the number of motor poles and the formula of synchronous speed.

The number of pole pairs of the motor is: etc.

Synchronous speed formula: n=60f p

In the above formula, n - the speed of the motor (revolution); 60 - per minute (seconds); f - mains frequency (Hz); p – the logarithm of the rotating magnetic field of the motor.

Because the asynchronous motor has a slip rate, the actual speed is less than the synchronous speed, and the specific actual turning speed is not the same as the motor produced by each manufacturer, but the difference is very small.

The slip rate, also known as the slip rate, occurs when the tire emits traction or braking force, and the relative motion between the tire and the ground occurs.

Varies with the magnitude of the load. According to national standards and IEC standards, the full-load slip rate of the universal asynchronous motor is 1 5 5.

When the slip rate is zero, there is no slip rate, i.e., the synchronization speed. Synchronous motor, no slip rate.

When the slip rate is equal to 1, the motor does not rotate. Due to this, the rotation difference cannot be 0 or equal to 1.

The oldest name is cascade speed regulation, later called internal feedback speed regulation, and now called rotor frequency conversion speed regulation.

It is to connect the rotor circuit of the winding motor to the rectifier and inverter device, and through different control methods, the rectifier and inverter device show unequal impedance, so as to change the resistance value of the motor rotor circuit and achieve the purpose of speed regulation. Because the device is in the rotor circuit, when the rotor speed is changed to grind and change, the frequency of the circuit changes, so it is called the rotor to change the dust and travel the frequency to adjust the cluster speed.

The inverter motor is essentially a squirrel cage motor, if the rotor of the winding motor is shorted, it can also be connected to the lower end of the inverter, and it is controlled by the inverter, so the inverter motor is the same as other asynchronous motors, it needs to be divided, and the synchronous speed of the motor with different pole pairs is different, and the smaller the number of pole pairs, the faster the motor inverter outputs the same frequency voltage, which meets the formula: n=60f p. where f is the output frequency and p is the number of pole pairs of the motor.

n is the actual rotational speed.

It can be non-polarized, and most of the poles on the market are designed to match the original general-purpose motors. This is usually achieved by retrofitting a separate fan behind the motor.

For example, if you need a motor with low speed and high torque, and the maximum speed is not very high, you can choose an 8-pole motor.

t=9550*p n p is the power, n is the speed. The synchronous speed of the 8-pole motor is low n=60f p 750r min, so the torque is large. It is suitable for low-speed and high torque situations.

On the contrary, the 2-pole motor is suitable for running at high speeds with relatively small torque.

n=60f p Changing the frequency can also change the speed, so the inverter motor can also set different reference frequency points to achieve the purpose.

For example, the speed of 25Hz, 4-pole motor is equivalent to 50Hz, 8-pole motor, because it is a specific frequency conversion design, its characteristics can be more matched with the inverter, the speed range can be wider, generally from 60r min to 3600r min, and 8-pole motor is generally 75r min 1500r min

The number of poles reflects the synchronous speed of the motor, which is 3000r min for 2 poles, 1500r min for 4 poles, 1000r min for 6 poles, and 750r min for 8 poles.