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Efficiency measurement method of permanent magnet motor for ultra-high speed oil-free air compressor

A technology of air compressors and permanent magnet motors, which is applied in the direction of motor generator testing, measuring devices, power measurement, etc., and can solve the problem that air compressors cannot measure the efficiency of motors alone

Active Publication Date: 2021-10-08
WENLI GUANGDONG TECH CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The invention proposes a method for measuring the efficiency of the permanent magnet motor of an ultra-high-speed oil-free air compressor, which solves the problem that the efficiency of the motor cannot be measured separately due to the structural characteristics of the air compressor

Method used

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  • Efficiency measurement method of permanent magnet motor for ultra-high speed oil-free air compressor
  • Efficiency measurement method of permanent magnet motor for ultra-high speed oil-free air compressor

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Embodiment Construction

[0037] Such as figure 1 As shown, it is a structural schematic diagram of a permanent magnet motor for an ultra-high-speed oil-free air compressor provided by the present invention. A stator core 6 with a stator coil 4 is fixed on the inner wall of the casing 5, and a high-speed bearing is also passed in the casing 5. 3. The rotor 1 located at the center of the stator core 6 is installed. The two ends of the rotor 1 pass through the casing 5 and are respectively connected with the first-stage turbine 2 and the second-stage turbine 8. In the casing 5, there are also fixed rotor 1 The coaxial inner fan 7 on the top is used for heat dissipation;

[0038] A cooling waterway 9 is also provided in the casing 5, and the cooling waterway 9 can be arranged in the axial direction of the rotor 1, or arranged in a spiral shape. There is no specific limitation in the present invention, and the cooling waterway 9 is also provided with a water inlet 91 and a water outlet. 92.

[0039] The ...

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Abstract

The invention provides a method for measuring the efficiency of a permanent magnet motor of an ultra-high-speed oil-free air compressor. Temperature sensors are respectively arranged on the water inlet and outlet of the cooling water circuit of the permanent magnet motor, the stator coil, and the stator core, and then the permanent magnet motors are measured respectively. The copper loss and other losses of the motor in the no-load state, rated speed and rated torque state of different cooling water temperatures are finally calculated to obtain the ratio of output power to input power (ie, efficiency) in the actual operating state. The invention measures the temperature rise of the iron core according to the thermal circuit principle to obtain the loss of the motor, thereby obtaining the efficiency of the motor, and the method is simple and reliable.

Description

technical field [0001] The invention relates to a method for measuring the efficiency of an ultra-high-speed motor, belonging to the technical field of permanent magnet synchronous motors. Background technique [0002] Ultra-high-speed oil-free air compressors are used in fuel cell engines, and their rotor speeds can reach more than 100,000 rpm. The ultra-high-speed permanent magnet synchronous motor adopts ultra-high bearings, such as air dynamic pressure bearings, etc., and its rotor, rotor inner fan, primary turbine and secondary turbine are connected in series. [0003] At present, there is still a lack of ultra-high-speed and small torque sensors, so the torque cannot be measured by the torque sensor, and then combined with the speed to calculate the output power and efficiency of the motor. Moreover, because the motor and the air compressor are completely combined, it is impossible to use the method of running two air compressors in series to obtain the total loss and...

Claims

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Application Information

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IPC IPC(8): G01L3/26G01R31/34
CPCG01L3/26G01R31/34
Inventor 华青松王建辉仙存妮韦福东刘朋鹏江涛魏建新
Owner WENLI GUANGDONG TECH CO LTD
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