Friction moment measurement method for life evaluation of motor ball bearing

A friction torque, ball bearing technology, applied in the field of measurement, can solve the problems of lack of strict control and poor pertinence, and achieve the effect of high measurement efficiency and precision

Active Publication Date: 2012-12-19
BEIJING PULIMEN ELECTRO MECHANICAL HIGH TECHN CO
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The traditional measurement method is: in the motor assembly acceptance and subsequent use, the inertia time after the motor is powered off is used as a technical index to check the bearing assembly quality. in need of improvement

Method used

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  • Friction moment measurement method for life evaluation of motor ball bearing
  • Friction moment measurement method for life evaluation of motor ball bearing

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Embodiment Construction

[0015] The measurement principle of the present invention is: during the running-in period of the motor, the speed of the growth and change rate of the friction torque of each motor bearing is determined by a speed measurement method. There are many methods of motor speed measurement, such as photoelectric code disc speed measurement, photoelectric speed measurement, back EMF speed measurement, etc. The installation of the photoelectric code disc on the motor shaft will bring additional moment of inertia; the photoelectric speed measurement must spray or etch some kind of non-reflective mark on the surface of the motor; The motor speed is measured by the potential cycle method or the photoelectric velocimetry method, and then the friction torque of the ball bearing is obtained by using the speed change rate, so as to obtain the change rate of the ball bearing friction torque with the working time, and then give the conclusion of the service life evaluation of the ball bearing f...

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Abstract

The invention discloses a friction moment measurement method for life evaluation of a motor ball bearing, comprising the steps of: carrying out counter frequency measurement on a square wave signal (or photoelectric speed measurement signal) converted from a counter potential signal after the outage of a motor so as to compute and obtain the rotation speed variation of the rated work rotation speed of the motor at the outage moment; at a certain set interval, measuring the rotation speed variation of the motor after the outage for one time, multiplying the angular speed variation value by the rotation inertia of the motor and then subtracting the wind resistance moment value and the vortex moment value of the motor at the rotation speed so as to obtain the friction moment value of the motor ball bearing; and carrying the life evaluation on the motor ball bearing according to the variation value of the friction moment of the bearing at the outage moment of the motor and the total variation value of the friction moment of the bearing. According to the friction moment measurement method, an outgoing line of the motor is used for carrying site measurement on the friction moment of the motor ball bearing, the use is simple and convenient, special measurement personnel are not required, and the method can be carried out by common technical personnel after short training, so that the measurement efficiency and the measurement precision are improved.

Description

technical field [0001] The invention relates to a method for measuring the friction torque of a ball bearing for an electric motor, in particular to a method for measuring the friction torque for evaluating the life of an electric ball bearing at a rated operating speed, and belongs to the technical field of measurement. Background technique [0002] For hysteresis synchronous motors used in the inertial field, the indicators for inspecting the quality of motor products are mainly synchronization time, inertia time, starting current, working current, dynamic balance, mechanical environment measurement, high and low temperature measurement, temperature rise, life, etc. The hysteresis synchronous motor is used as the driving motor in the gyroscope. The main problem in production is the use of ball bearings. Solving this problem has practical significance for improving product quality. The method and device for evaluating and measuring the life of ball bearings used in electric...

Claims

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Application Information

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IPC IPC(8): G01L3/00
Inventor 钟如愚秦和平焦泽德肖跃华袁朝阳才小士
Owner BEIJING PULIMEN ELECTRO MECHANICAL HIGH TECHN CO
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