JPH05142283A - Inspecting device of winding of motor - Google Patents

Abstract

PURPOSE:To obtain an inspecting device of a winding which detects misplacement of a coil of a stator winding easily. CONSTITUTION:A plurality of magnetic flux detecting elements 3 are embedded at equal angular intervals in the outside surface of a cylindrical test core 2 having the outside diameter corresponding to a rotor, and a stator core 1 having windings wound is fitted on the test core. Each winding is made opposite to the magnetic flux detecting element 3, a DC current is made to flow through a main winding 5 and an auxiliary winding 6 and misplacement of a coil is detected from the direction of a magnetic flux generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding inspection device for an electric motor, and more particularly to a winding inspection device for detecting a coil misplacement of a stator winding.

[0002]

2. Description of the Related Art Conventionally, in order to detect a coil misplacement of a stator winding, a rotor for inspection is inserted into a stator having windings wound thereon, and an alternating current is actually passed to measure a consumed current, and a normal condition is measured. In this case, the difference between the current value and the measured value is used to determine the coil insertion error, and at the same time, the disconnection is confirmed.
However, depending on the winding specifications of the stator winding, the difference from the current value in the normal case is not significant, and it may not be possible to determine the coil insertion error.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a winding inspection device for surely detecting a coil misplacement of a stator winding.

[0004]

In order to achieve the above object, a cylindrical test iron core corresponding to a rotor is inserted inside a stator iron core around which windings are wound, and the outer circumference of the test iron core is inserted. Embedded a plurality of magnetic flux detection elements facing the winding,
The stator winding is divided into a main winding and an auxiliary winding, and a direct current is applied to each, and the direction of the magnetic flux generated by the magnetic flux detection element facing each pole of the stator core is detected to detect the coil insertion error and The rotation direction is detected from the direction of current and the direction of magnetic flux.

[0005]

According to the above construction, a test iron core having a plurality of magnetic flux detecting elements embedded therein is inserted into the wound stator iron core so as to face the winding and a DC current is supplied to each of the main winding and the auxiliary winding. , And the direction of the generated magnetic flux can be detected by the magnetic flux detecting element, so that the misalignment of the coils can be found.
At the same time, the direction of rotation of the motor can be confirmed from the direction of direct current and the direction of magnetic flux. Further, by applying a direct current, it is possible to detect a wire breakage or a wire connection error.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings regarding a stator core 1 having 16 slots and 4 poles. FIG. 1 is a plan view showing a state where a stator iron core 1 is attached to a test iron core 2 with some windings removed, and FIG. 2 is a cross-sectional side view of the same portion, showing an outer side of a cylindrical test iron core 2 suitable for a rotor. To 8
One magnetic flux detecting element 3 (for example, a hall element) is embedded at equal angular intervals, and the stator core 1 having windings wound around the lead wire 4 is inserted as a reference. The central pole of the winding 6 is arranged to face the magnetic flux detecting element 3 of the test iron core 2. As indicated by the mark in the figure, H1 of the magnetic flux detecting element 3 is
H3, H5, H7, H2, H4, H in the auxiliary winding 6
6, H8 face each other. In this state,
When a direct current is applied to the main winding 5 or the auxiliary winding 6 by the inspection circuit shown in, the winding generates a magnetic flux in a predetermined direction,
The direction of the magnetic flux can be detected by the magnetic flux detecting element 3 facing each pole. FIG. 4 is a winding diagram of a 16-slot 4-pole stator, showing the state of the windings inserted in the slots 7 from 1 to 16, in which the magnetic flux detecting element 3 is arranged facing the poles. When a direct current is made to flow by the circuit of FIG. 3, the magnetic poles shown in the lower part of each magnetic flux detection element 3 are detected. If there is a coil misplacement, this polarity is reversed and the coil misplacement can be easily found. .

[0007]

As described above, according to the present invention, a stator iron core having a winding wound therein is inserted into a test iron core in which a magnetic flux detecting element is embedded, and a direct current is passed through the main winding and the auxiliary winding. By detecting the direction of the magnetic flux with the magnetic flux detection element, it is possible to easily detect the misplacement of the coils, and at the same time, it is possible to detect the disconnection of the winding wire, the misconnection, and the rotation direction. Can be rationalized.

[Brief description of drawings]

FIG. 1 is a partially omitted plan view showing a state in which a stator iron core wound with a winding is attached to a test iron core according to the present invention.

FIG. 2 is a sectional side view of the same portion.

FIG. 3 is a circuit diagram for the same inspection.

FIG. 4 is a winding diagram of a 16-slot 4-pole stator.

[Explanation of symbols]

 1 Stator iron core 2 Test iron core 3 Magnetic flux detection element 4 Lead wire 5 Main winding 6 Auxiliary winding 7 Slot

Claims (1)

[Claims] 1. Inside a stator core around which a winding is wound,
Insert a cylindrical test iron core corresponding to the rotor, embed multiple magnetic flux detection elements on the outer circumference of the test iron core facing the winding, and divide the stator winding into a main winding and auxiliary winding. Direct DC current is applied to each of the poles of the stator core, and by detecting the direction of the magnetic flux generated by the magnetic flux detection elements facing each other, coil misalignment is detected, and the direction of rotation is detected from the direction of the DC current and the direction of the magnetic flux. A winding inspection device for an electric motor, characterized in that