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Apparatus for testing rotating speed of asynchronous motor

An asynchronous motor and speed technology, which is applied to devices using electric/magnetic methods, etc., can solve the problems of unintuitiveness, inability to be used in all occasions, and low accuracy.

Inactive Publication Date: 2007-08-01
四川希望深蓝能源化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The accuracy of this method is not high, it is not intuitive, and it cannot be used in all occasions, and it is fundamentally an auxiliary technology in vector control technology, rather than a real speed measurement

Method used

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  • Apparatus for testing rotating speed of asynchronous motor
  • Apparatus for testing rotating speed of asynchronous motor

Examples

Experimental program
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Embodiment Construction

[0009] As shown in Figure 1, a device for measuring the speed of an asynchronous motor consists of a choke coil RF U , choke coil RF V , choke coil RF W , oscillator OSC, transformer B 1 , Transformer B 2 , capacitance C 1 , capacitance C 2 , capacitance C 3 , capacitance C 4 , resistance R 1 , Potentiometer R 2 , resistance R 3 , resistance R 4 , resistance R 5 , resistance R 6 , Transistor T 1 , Transistor T 2 Composed of tachometer ZS; transformer B 1 By the primary winding L 11 , Symmetrical secondary winding L 12 and L 13 and the secondary winding L 14 Composition; Transformer B 2 By the primary winding L 21 , Symmetrical secondary winding L 22 and L 23 Composition; choke coil RF U One end is connected to the U-phase input end of the three-phase AC power supply, and the other end is connected to the capacitor C 1 One end of the U-phase output terminal U 1 , choke RF v One end is connected to the V-phase input end of the three-phase AC power suppl...

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Abstract

The present invention discloses a device for measuring rotating speed of asynchronous motor. Said device consists of choke oil RFu, RFv and RFw, oscillator OSC, transformer B1 and B2, capacitor, C1, C2, C3 and C4, resistor R1, R3, R4, R5 and R6, potentiometer R2, transistor T1 and T2 and tacheometer ZS. Said invention also provides the connection method of all the above-mentioned components and the working principle of said device. Said device has no need of mounting any rotating component in the exterior and interior of said asynchronous motor and has no need of making any change, and can quickly measure rotating speed of said asynchronous motor.

Description

Technical field [0001] The invention relates to a motor speed measuring device, especially a device for measuring the rotational speed of an asynchronous motor. Background technique [0002] Before the present invention appeared, the rotational speed measurement of the asynchronous motor required some kind of speed-measuring device installed inside or outside the asynchronous motor, which could be realized only when the asynchronous motor was modified. For example, installing a rotary encoder or a tachogenerator on the shaft of an asynchronous motor, etc. However, this additional installation is very inconvenient, and cannot be welcomed by users and installation parties. So a new method appeared to indirectly measure the speed of the asynchronous motor. In the frequency converter control technology, there is a so-called "vector control technology without speed sensor", which uses the motor parameters set in advance to measure the current, voltage, frequency and phase of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P3/46
Inventor 蔡士齐
Owner 四川希望深蓝能源化工有限公司