Structure nameplate of three-phase asynchronous motor and wiring method of stator three-phase winding - News - Global IC Trade Starts Here Free Join

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Figure 1-1 Exploded view of three-phase asynchronous motor

First, the structure of three-phase asynchronous motor
(1) Stator (still part)

1. Stator Core: The stator core acts as part of the motor's magnetic circuit and places stator windings on it.

2. Stator winding: The stator winding is the circuit part of the motor, which is connected to three-phase alternating current to generate a rotating magnetic field.

There are three main insulation items:
(1) Insulation to ground

(2) Phase insulation

(3) Interturn insulation

Junction box (△ connection method)

Wiring method of stator three-phase winding (1) Star connection method (Y connection)

(2) delta connection (△ connection)

3. Base

(2) Rotor (rotating part)

The rotor is a rotating part of the motor and includes components such as a Rotor Core, a rotor winding, and a rotating shaft.

Rotor core

Function: Part of the magnetic circuit of the motor and place the rotor windings. Generally, it is formed by punching and laminating a 0.5 mm thick silicon steel sheet, and the outer circumference of the silicon steel sheet is punched with uniformly distributed holes for arranging the rotor windings.

2. Rotor winding

The function is to cut the rotating magnetic field of the stator to generate an induced electromotive force and current, and form an electromagnetic torque to rotate the motor. According to the structure, it is divided into a squirrel cage rotor and a wound rotor. As shown in Figure 1-5.

Figure 1-5 rotor winding

(1) Squirrel-cage rotor: If the rotor core is removed, the entire winding is shaped like a squirrel cage, so it is called a cage winding. The small cage motor adopts a cast aluminum rotor winding, and is welded by a copper strip and a copper end ring for a motor of 100 KW or more. As shown in Figure 1-6.

Figure 1-6 cage rotor

a) cage winding b) rotor profile c) cast aluminum cage rotor

(2) Wire-wound rotor: The wound rotor winding is similar to the stator winding, and is also a symmetrical three-phase winding, which is generally connected in a star shape, and three outgoing heads are connected to three collecting rings (slip rings) of the rotating shaft. Then connect to the external circuit through the brush, as shown in Figure 1-7.

Figure 1-7 Schematic diagram of rotor wiring of wound rotor asynchronous motor

a) Wiring diagram b) Brushing device

3. Shaft

Used to transmit torque and support the weight of the rotor, usually made of medium carbon steel or alloy steel.
(3) Other attachments

End caps, bearings, bearing end caps, fans

2. Nameplate

Figure 1-8 Nameplate of three-phase asynchronous motor

1. Model Y90L-4

2. Rated power PN refers to the mechanical power output on the motor shaft when the motor is running under rated operating conditions, in KW.

In the formula, UN1, IN1, ηN, and cosφN are the rated line voltage, line current, efficiency, and power factor of the motor, respectively.

3. Rated voltage UN1 refers to the line voltage applied to the stator winding when the motor is running under rated operating conditions, in units of V or KV.

4. Rated current IN1 refers to the line current flowing into the stator winding when the motor is rated voltage and output rated power, and the unit is A.

5. Rated speed nN refers to the speed of the rotor when the motor is running under rated operating conditions, in units of r/min.

6. Rated frequency fN China's specified power frequency is 50HZ.

7. Rated power factor cosφN refers to the power factor of the stator side when the motor is running under rated operating conditions.

8. Connection method refers to the method of connecting the three-phase winding of the motor stator with the AC power supply.