JPH0720075U - Rotor coil end monitor - Google Patents

Abstract

(57) [Summary] [Purpose] Automatically detects the radial displacement of the coil end support member of the rotor. [Structure] An optical displacement meter 6 opposite to the coil end supporting member 5 and a measurement position of the optical displacement meter 6 are taken in,
The circumferential direction position detector 9 opposite to the rotor 1 is calculated, and the radial direction of the coil end supporting member 5 is calculated by calculation based on the signal of the circumferential direction position detector 9 and the signal of the optical displacement meter 6. And a device 13 for issuing an alarm when a deviation occurs in the calculation device 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotor coil end monitor device for monitoring radial displacement of a coil end.

[0002]

[Prior art]

 As an apparatus for detecting the relative displacement of the rotor in the radial direction, there is an air gap monitor as seen in the document IEEE TRANSACTION ON ENARGY CONVERSION (Vol.EC-2.No4.DEC 1987 P526). This method has a large number because it targets two places on the same flat circumferential surface, and it is not possible to detect the radial displacement of the supporting member of the rotor coil end which is uneven. Therefore, the amount of deformation in the radial direction of the rotor coil end of a rotating electric machine that is composed of a support member such as an insulator or non-magnetic steel wire for electric binding, has many irregularities in the circumferential direction, and rotates at high peripheral speed. Conventionally, an optical displacement meter was placed on the outer circumference of the rotor as a detection device to measure the deformation, and a marker attached to the rotation shaft for one rotation was detected by an optical probe to obtain data at low speed rotation. The method of comparison is adopted in units of one rotation.

This method is a simple and effective method during constant speed operation of a rotating electric machine, but a DC motor or a variable speed generator motor, which undergoes reversible operation with drastic speed changes, cannot be compared with the initial shape. There is a drawback in that the true deformation due to centrifugal force can be measured. On the other hand, as a simple rotor coil-end monitor, a He-Ne gas laser light source, etc. is squeezed by a condenser in the axial direction of the air gap between the rotor and the stator, and this light is received by a receiver opposite in the axial direction. There is a method to measure the radial deformation from the amount of light blocked. Similar to the above method, this method has a large change in rotational speed, is not suitable for a model that performs reversible operation for the reasons described above, and has the drawback that the axial position where light is blocked cannot be confirmed.

[0004]

[Problems to be solved by the device]

 Therefore, in order to prevent the deformation of the winding ends protruding from the iron core of the rotor due to centrifugal force, the present invention has an uneven shape fixed to the outer circumference of the winding ends with insulating tape or non-magnetic steel wire for electric binding. A coil end support device for a rotor that accurately detects the deformation in the radial direction of the coil end support member even with a change in the number of revolutions and reversible operation and gives an alarm when an abnormally large deformation occurs. .

[0005]

[Means for Solving the Problems]

 To achieve the above object, a coil end monitor device for a rotor according to the present invention comprises a coil end support member for fixing a winding end portion protruding from an iron core of the rotor. An optical displacement meter installed opposite the member, a measurement position of this optical displacement meter, and a circumferential position detector installed opposite to the rotor, and the optical displacement meter based on a signal from this circumferential position detector. The initial shape of the rotor and the A / D converter for converting the signal of the above into a digital signal are stored in advance, and the radial displacement of the coil end supporting member is calculated from the stored signal and the signal of the optical displacement meter. And an alarm device for issuing an alarm when there is a deviation in the signal from this arithmetic device.

[0006]

[Action]

 In the configuration according to the present invention, the radial displacement of the coil end support member can be automatically detected by an optical displacement gauge or the like, and when the coil end support member is displaced in the radial direction, an alarm is generated. I am trying to put out. Therefore, the rotary electric machine can continue safe operation.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of this embodiment. On the outer circumference of the coil end supporting member 5 for fixing the winding end portion 4 projecting from the iron core 3 of the rotor 1, an optical displacement meter 6 using laser light and having high frequency characteristics is installed oppositely. This optical displacement meter 6 is connected to an amplifier 7 via a stator 2. The output of the amplifier 7 is connected to the A / D converter 8. The circumferential position detector 9 opposite the rotor 1 is composed of a rotary encoder 10 that generates a multi-divided pulse signal in the circumferential direction, and a reversible counter 11 that has an interface for connecting to a computer. Has been done. The A / D converter 8 converts the signal of the optical displacement meter 6 into a digital signal by the signal of the circumferential position detector 9. The displacement signal converted into a digital signal and the circumferential position signal represented by the number of reversible counters are collected by the arithmetic unit 12 in real time. The arithmetic unit 12 compares the collected displacement signals with the initial shape of the supporting member which is obtained by previously rotating at low speed and stored, and calculates the radial deformation.

FIG. 2 is a conceptual diagram for explaining a method of correcting the thermal expansion of the winding end portion 4. In order to perform this correction, an optical displacement gauge 6 that measures the axial extension of the winding end portion 4 is arranged at the axial end. The signal of the optical displacement meter 6 is also converted into a digital signal by the A / D converter 8 by the signal of the circumferential position detector 9 and taken into the arithmetic unit 12.

The arithmetic unit 12 determines the axial position of the support member measured by each radial direction optical displacement gauge 6 from the axial extension data of the winding end 4. Then, the arithmetic unit 12 is set to perform a comparison calculation with the initial shape of the supporting member 5 corresponding to the measuring section. In the figure, the optical displacement gauge a is calculated by comparing with the initial shape value of the a1 part when there is no thermal elongation, and by comparing with the initial shape value of the an part for a certain thermal elongation (δn). It is set. This correction method is applied to all of the optical displacement meters 6 arranged in the radial direction in the axial direction. As a result, the measurement error of the optical displacement meter 6 in the radial direction due to the measurement position shift of the winding end portion 4 is completely prevented. When the true radial deformation thus measured exceeds the set warning value, the alarm device 13 issues an alarm.

As described above, the rotor coil end monitor device corrects the thermal expansion of the coil end support member under any operating condition such as the change of the peripheral speed of the coil end support member and the reversible operation, and always keeps the true value. The radial deformation can be accurately monitored.

[0011]

As described above, the coil end monitor device for a rotor of the present invention incorporates an optical displacement meter opposite to the coil end support member and a measurement position of this optical displacement meter, A circumferential position detector that is installed opposite to the rotor, an A / D converter that converts the signal of the optical displacement gauge into a digital signal by the signal of this circumferential position detector, and the initial shape of the rotor are stored in advance. An arithmetic device for calculating the radial displacement of the coil end supporting member from the stored signal and the signal of the optical displacement gauge, and an alarm device for issuing an alarm when the signal from the arithmetic device has a deviation. With this, it is possible to accurately detect the displacement of the coil end supporting member, and to issue an alarm if there is displacement. Therefore, rotating electric machines can be operated safely.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of the present invention.

FIG. 2 is a schematic view for monitoring a radial displacement of a coil end support member, among the schematic views showing an example of the present invention.

[Explanation of symbols]

 1 Rotor 2 Stator 3 Iron core 4 Winding end 5 Coil end support member 6 Optical displacement meter 9 Circumferential position detector 12 Arithmetic device 13 Alarm device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Chisato Shibata 2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Toshiba Keihin Office

Claims (1)

[Scope of utility model registration request] 1. A winding end projecting from an iron core of a rotor,
In a rotary electric machine having a fixed coil end support member, an optical displacement meter opposed to the coil end support member and a measurement position of the optical displacement meter are taken in to detect a circumferential position opposed to the rotor. Device, an A / D converter for converting the signal of the optical displacement sensor into a digital signal by the signal of the circumferential position detector, and the initial shape of the rotor are stored in advance. It is characterized by further comprising an arithmetic unit for calculating the radial displacement of the coil end supporting member from the signal of the optical displacement gauge, and an alarm unit for issuing an alarm when the signal from the arithmetic unit has a deviation. Rotor coil end monitor.