Common types of motor shafts (below)
According to the combination of shaft and iron core. It can be divided into a knurled shaft in the middle, a hot sleeve shaft and a shaft with a keyway in the middle. The knurled shaft is used for small motors below the 10 kW, which can save the work of machining the key and the keyway. However, when the shaft is pressed into the iron core, it is easy to deform the shaft. During the operation of the motor, some rotor iron cores combined with knurled iron will move axially. This shaft deformation is caused by too tightly, the axial displacement is caused by the lack of interference between the two.
The middle part of the hot sleeve shaft is neither knurled nor keyway. There is a certain amount of interference between the shaft and the inner hole of the iron core, which is nested when the iron core is hot.Rotating shaftAs long as the interference is properly selected, the combination of the rotor core and the shaft is very reliable.
The shaft with keyway in the middle can be divided into a health groove and two keyways. The shaft with one keyway is used for small motors, and the shaft with two keyways is used for medium and large motors. The rotor core (or bracket) and the shaft It is combined with keys, the axial direction of the core is fixed, one end is added with a shoulder, and the other end is stuck in the annular keyway on the shaft with an arc key, this kind of shaft can transmit a large torque, and is often used in motors with large power and motors with frequent forward and reverse rotation during operation or the rotor core is not suitable for hot sleeve.
According to the shaft extension shape classification. It can be divided into cylindrical shaft extension shaft, conical shaft extension shaft and shaft extension shaft with half coupling. Cylindrical shaft extension is convenient to process and is most used in motors. Circular dimensional shaft is supplemented with fastening bolts, which has a large processing capacity. However, the equipped transmission wheel is convenient to assemble and disassemble and is mostly used for special motors. Shafts with half coupling are mainly used for hydro-generators and large DC motors.
According to the axis shape classification. It can be divided into a solid shaft, a shaft with a deep hole at one end and a shaft with a central through hole. The solid shaft is most commonly used in motors. The shaft with a deep hole at one end is mainly used for wound asynchronous motorsRotor shaftThe lead wire on the top is connected with the collector ring outside the end cover through the hole, and the shaft with the central through hole is mainly used for large motors: in the double water-cooled turbo-generator, the central through hole is also used as a part of the cooling water circuit.
According to the shaft magnetic conductivity classification. It can be divided into a magnetic shaft and a non-magnetic shaft. The magnetic shaft is mainly used in a steam turbine generator, and the shaft of other motors usually does not need magnetic conductivity.
Other classification methods. According to the different number of shaft extension, it can be divided into uniaxial extension shaft and biaxial extension shaft. According to the different number of bearings, it can be divided into single-axis bearing shaft, double-axis bearing and multi-bearing shaft.
Rotary shaft, rotor shaft, motor shaft, micro shaft
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2024-01-02
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