What is the purpose of a rotor overspeed test?_Wolong Explosion-Proof Motors, Explosion-Proof Motors, Soft Starters, Atex Motors

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What is the purpose of a rotor overspeed test?

source：未知 time：2024-08-13 09:06nbsp; click：

The overspeed test is to test the mechanical strength of the rotor parts under centrifugal force and the mechanical strength of the bearings under overspeed due to the rotor's own shape, manufacturing process and in a specific working environment, so as to ensure the rotor's operating capacity and safety limit. Overspeed test is an important process link for ensuring product quality and safety, and is very necessary for guiding design optimization!

For most cast aluminum rotor motors, they can meet the working conditions of high-speed operation, but some rotors have defects in their own cast aluminum process, which leads to severe softening of the rotor due to heat during operation, and the deformation of the rotor end due to centrifugal action and interference with the stator winding. The case I came into contact with is a 2-pole three-phase asynchronous motor with a synchronous speed of only 3000 rpm.

For wound rotor motors, due to the particularity of the windings placed in the rotor part, this type of motor generally only has 4 poles, and necessary fixation and disposal must be performed at the end of the rotor. In order to ensure the safety of the motor operation process, this type of motor must strictly undergo overspeed tests and be protected by speed limiting devices during the motor operation.

In the actual application of motors, more and more overspeed switches are added, which effectively prevents unnecessary problems of motor rotors and bearings caused by overspeed. In the actual application of wound motors, there have been many rotor winding failures caused by slipping. From the appearance of the failure, the end of the rotor winding is seriously deformed radially, directly interfering with the stator winding, resulting in devastating burning of both the stator and rotor windings.

Many motor manufacturers can only test the performance compliance of the rotor through the motor overspeed test, which in a sense has certain risks; in the product technical conditions of the wound rotor motor, it is stipulated that the rotor should be able to withstand 1.2 times the rated speed without deformation. However, how to directly conduct an overspeed test on the rotor, especially for the high-speed test under the current variable frequency application state, is a very urgent problem to be explored and solved. On the one hand, the rotor compliance needs to be verified, and on the other hand, the performance of the bearing needs to be verified, and the temperature conditions when the motor is running need to be simulated when necessary.

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