Non-contact PMSM test device and velocity measurement method thereof

Abstract

The invention discloses a non-contact PMSM test device and a velocity measurement method thereof. The test device includes an embedded handle and a nixie tube embedded on an outer wall, wherein an outer wall of the embedded handle is embedded with the nixie tube, a port at one end of the embedded handle is connected with an embedding port, an internal circuit board of the embedded handle is weldedwith a coil induction detection circuit, an RC filtering circuit, a Zener tube clamp, a signal amplification circuit, a signal comparison circuit, a pulse signal processing circuit and a rotational speed display and pole pair circuit, the embedding port is internally sleeved with a coil connected with the coil induction detection circuit through a lead, calipers internally embedded with the coilare taken as a test tool, the power supply frequency is detected through an induction signal of a phase current, filtering shaping and separation of the collected signal are performed, a regular rectangular pulse signal is finally obtained, the frequency f of a pulse signal is measured, based on the motor rotation speed formula of N=(60*f) / P, the rotation speed of a motor is calculated, through driving the nixie tube, the rotation speed is displayed.

Description

technical field [0001] The invention relates to a synchronous motor testing device and a speed measuring method thereof, in particular to a non-contact permanent magnet synchronous motor testing device and a speed measuring method thereof. Background technique [0002] Speed ​​is an important characteristic parameter in performance testing. The determination of many characteristic parameters in power machinery is inseparable from the functional relationship related to speed. Therefore, speed measurement is a key point in various fields of industrial production. [0003] Speed ​​measurement methods are divided into two categories: direct method and indirect method, that is, contact and non-contact. The direct method is to directly observe the mechanical motion of the machine or motor, and measure the law of mechanical motion within a specific time to measure the speed of the mechanical motion. The indirect method is to determine the speed indirectly because of the relationshi...

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Problems solved by technology

[0004] This type of speed sensor is a non-contact measurement, using the principle of inductive measurement, although it can solve the problem of motor speed measurement in complex environments within a certain range, but it cannot be used in all environments to test the motor speed, for example, there is no Hall in the pond The water pump of the component, and we cannot get close to the underwater motor. Some of the above non-contact measurement methods cannot meet the test requirements in this environment. From the perspective of the operating environment, most of the above test methods are limited to experiments. It is not convenient for outdoor testing; from the perspective of cost, the above test method needs to be equipped with some professional testing instruments. Considering the project cost, it is impossible for everyone to equip these instruments. From the perspective of convenient operation, the above The test method needs to do some tedious equipment connection work in the early stage of the test, which greatly reduces the work efficiency

[0005] No matter in the field of research and development, production or field survey, we strive to use more convenient, faster, least cost-intensive methods and equipment that is easy to carry and operate to quickly complete the speed test of mechanical equipment. For this, in order to solve the above test In the method, the test environment has limitations, it needs to be equipped with high-demand test instruments and the test operation is cumbersome. It is urgent to propose a motor speed test method that is suitable for all working environments and does not require professional equipment.

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