What does B5 mean in three phase asynchronous motor

Three-phase asynchronous motor.

There are mainly B3, B5 and B35 frames, which are the most common installation methods of ordinary three-phase asynchronous motors.

There is a base, and there is no direct connection to the mounting flange.

There is no base, there is a direct mounting flange.

There is a base, there is a direct connection mounting flange.

There are many ways to install motors, mainly horizontal and vertical.

In the horizontal type, it is divided into B3, B35, B34, B5, B6, B7, B8, B9, B10, B14, B15, B20, B30;

Vertical type is divided into V1, V15, V2, V3, V36, V4, V5, V6, V8, V9, V10, V14, V16, V18, V19, V21, V30, V31;

However, the most commonly used installation methods in actual production are B3 (general horizontal), B5 (with flange without feet) and B35 (with feet with flanges).

B3 and B35 are horizontal installations, the main difference is B3 (general horizontal), B35 (with feet with flanges).

B5 (with flange without feet) refers to the flange mounted motor, which is often referred to as vertical installation.

V1 and V3 are subdivisions under the B5 installation method: V1 shaft extends downward, V3 shaft extends upward, B5, V1 and V3 installation methods both belong to FF flange installation, but B5 is horizontal flange installation (shaft is horizontal), V1 is vertical flange installation (shaft head down), and V3 is flange installation with shaft head upward. In general, V1 and V3 may have problems with bearing forces.

However, a better motor manufacturer can replace it when it is designed.

Installation method: flange installation, which means that the front end cover of the motor is flanged.

Three-phase means that the power supply is three-phase AC power supply, and asynchronous means that the rotation of the magnetic field is not synchronized with the rotor of the electric surface, and the magnetic field is a certain angle ahead of the rotor.

The meaning of asynchronous in a 3-phase asynchronous motor is that the rotational speed of the rotor is lower than the rotational speed of the stator rotating magnetic field (i.e., out of sync). - Because the frequency of alternating current is 50 Hz, taking the 2-pole 3-phase asynchronous motor as an example, the speed of the stator rotating magnetic field is equal to 3000 revolutions per minute after being energized, at this time, the rotor in the rotating magnetic field is relatively cut to the magnetic field lines of the stator magnetic field, so that the rotor closes the aluminum frame (commonly known as the squirrel cage strip) to produce induced current, and the rotor core produces a magnetic field, which is attracted by the rotating magnetic field of the stator and rotates, so it can be seen that the rotation condition of the rotor is that the stator magnetic field must be cut to obtain the current. Therefore, its rotational speed (about 2800 revolutions) is lower than the rotational speed of the stator rotating magnetic field, and this rotational speed difference is called asynchronous.

A three-phase motor is a machine that rotates with electricity, which then acts as a power source. Three-phase refers to the use of three-phase electricity, that is, each of the three wires is 380 volts. Asynchronous means that the rotating magnetic field and the rotor are not synchronized.

That is, the magnetic field of the stator is always one angle ahead of the rotor in order to rotate the motor in the required direction.

The asynchronous of three-phase asynchronous motor refers to the rotation of the rotor and stator of the three-phase asynchronous motor with the same direction and different speeds, and there is a slip rate.

Compared with single-phase asynchronous motors, three-phase asynchronous motors have good running performance and can save various materials. According to the different rotor structures, three-phase asynchronous motors can be divided into cage type and winding type.

The asynchronous motor of the cage rotor has a simple structure, reliable operation, light weight and low cost, and has been widely used, but its main disadvantage is that it is difficult to regulate the speed. The rotor of the wound three-phase asynchronous motor, like the stator, is also provided with three-phase windings and is connected to an external rheostat through slip rings and brushes. Adjusting the rheostat resistance can improve the starting performance of the motor and adjust the rotational speed of the motor.

To put it simply, there is a frequency of alternating current, and the speed of the generator determines the frequency, which is 50Hz alternating current in China, and the synchronous speed of the two poles is: 50Hz * 60 seconds = 3000 rpm. The asynchronous motor is relatively synchronous, and its speed is always less than the synchronous speed, such as the two-pole asynchronous motor is generally at 2880 rpm.

Can you understand that?

Three-phase asynchronous motor (triple-phase asynchronous motor) is a kind of induction motor, is a kind of motor that is powered by 380V three-phase AC current (phase difference of 120 degrees) at the same time, because the rotor and stator of the three-phase asynchronous motor rotate in the same direction and at different speeds, there is a slip rate, so it is called a three-phase asynchronous motor.

It's a 380 alternating current motor.