# What's the difference between a level 2 motor and a level 4 motor

Update:03 Jan 2020

What's the difference between a level 2 motor and a level 4 motor?
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1. Speed difference between the two
In principle, the main difference between level 2 motor and level 4 motor is the speed difference, that is, the synchronous speed of 2-pole motor is 3000 rpm, while that of 4-pole motor is 1500 rpm.
2. Different pole pairs
The pole pairs of the internal coils of the level 2 motor and the level 4 motor are also different. In the level 2 motor, there is a pair of poles. The synchronous speed of one pair of poles (two poles) is 3000 revolutions, and the asynchronous speed is about 2880 revolutions. In the level 4 motor, there are two pairs of poles, the synchronous speed of two pairs of poles (four poles) is 1500 revolutions, and the asynchronous speed is about 1450 revolutions.
Extended data:
The rated speed of a four pole motor is 1450 rpm, and the speed of the motor is expressed in N, n = (60F) / P, where f refers to the AC frequency, P refers to the number of poles, and the AC frequency in China is 50 Hz, so if a motor looks at its speed, it can find out how many poles it is.
The so-called pole is that each coil of the motor will produce N and S poles, and the number of poles contained in each phase of each motor is the number of poles. Since the poles appear in pairs, the motor can be divided into 2, 4, 6 and 8 poles.
Assuming that the output power is equal: the rotational speed of the two pole motor is n and the output force is f, then the rotational speed of the four pole motor is (1 / 2) n and the force is 2F. In other words, the speed of a two pole motor with equal output power is twice that of another four pole motor, but the output force is half of that of the four pole motor.

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