High-speed motor and assembly method thereof

Abstract

The invention discloses a high-speed motor, which comprises a motor casing, a motor main shaft, a motor stator and a motor rotor, wherein the motor stator is sleeved in the motor casing; the motor main shaft is arranged in the motor rotor and comprises a front half shaft, a rear half shaft and a pull rod; the pull rod is freely sleeved in an inner hole of the motor rotor; the front end of the pull rod is in threaded connection with the front half shaft; the rear end of the pull rod is in threaded connection with the rear half shaft; the front half shaft is tensioned with the rear half shaft by the pull rod; and the motor rotor is clamped between the front half shaft and the rear half shaft. The high-speed motor has the advantages of simple structure, convenient disassembly and assembly, convenient processing, large transmission torque and high critical rotation speed. The invention also discloses an assembly method of the high-speed motor.

Description

technical field [0001] The invention relates to the field of mechanical manufacturing, in particular to a high-speed motor and an assembly method thereof. Background technique [0002] High-speed rotating mechanical equipment is widely used in national defense, metallurgy, mining, chemical industry and other fields, such as various large fans, turbo compressors, ship power systems and centrifugal compressors. High-speed rotating machinery occupies an extremely important position in my country's national economy. [0003] Traditional high-speed rotating mechanical equipment mostly uses a transmission system (belt drive, gearbox drive, etc.) to achieve speed increase, and the power source is mostly an ordinary motor. Rotating mechanical equipment using this type of transmission mode allows a lower maximum operating speed. Due to the complexity of the transmission system, the vibration and noise are large during operation, there are many fault points, and the maintenance is mo...

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Problems solved by technology

This scheme has several disadvantages in practical engineering applications: 1. The installation of the rotor is inconvenient. Usually, it must be heated to a higher temperature before it can be placed on the main shaft. If the rhythm is too slow, the rotor and the main shaft may be "locked" and cannot be installed in place; 2. The disassembly of the rotor is inconvenient. Due to the large friction of the interference connection, a special press is required for disassembly. In many cases, disassembly After lowering the rotor, it was found that the inner hole of the main shaft and the motor rotor had been damaged and could not be used any longer; 3. Under the condition of high-speed rotation, the motor rotor would increase under the action of centrifugal force, resulting in a decrease in the interference between the motor rotor and the main shaft, and the actual motor The torque that can be transmitted is reduced or even the torque cannot be transmitted at all; 4. If the transmitted torque is reduced in order to overcome the centrifugal force, the method of increasing the interference between the inner hole of the rotor and the main shaft can be used, but due to the increase of the interference, The stress on the inner surface of the rotor increases, which is easy to damage the rotor; 5. Since the main shaft adopts an integral structure, the length of the main shaft is very long, which is inconvenient to process and requires high processing capacity of the machine tool; Deformation is easy to occur during the process; 7. The spindle is too long, resulting in a decrease in the critical speed of the spindle system, which is not conducive to realizing high speed

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