JP3191506B2 - Detection method of stator winding reversal failure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a winding reversal failure in a motor stator winding process.

[0002]

2. Description of the Related Art FIG. 5 schematically shows a conventional method of detecting winding reversal failure. In FIG. 5, 14 is a magnet, 15 is a driving unit, 16 is a stator winding to be inspected, 17 is an induced voltage input terminal, 18 is a peak value measuring unit for detecting a peak voltage, 19
Denotes a distortion factor measurement unit, and 20 denotes a determination unit.

The operation will be described below. When one of the magnets 14 placed in the 16 stator windings to be inspected is rotated by the drive unit 15, an induced voltage is generated in the stator windings. The induced voltage is input from the input terminal 17, the peak voltage and the distortion rate are measured by the peak value measurement section 18 and the distortion rate measurement section 19, and the failure is detected by the determination section 20 .

[0004]

However, in this method, an induced voltage is generated in both a good winding and a bad winding.
FIG. 6A shows a non-defective product waveform, and FIG. 6B shows a defective product waveform. Compared to the non-defective winding waveform (almost sinusoidal waveform), the defective winding in which one pole of the winding is reversed by 100% can be detected only by slightly different peak value and distortion rate. At a small reversal rate of about 10 to 30%, the induced voltage waveform falls within the range of the non-defective product waveform, it is difficult to detect the waveform, and a defect is found only for the first time in the characteristic inspection process after the motor is completed.

Further, since the distortion rate of the induced voltage waveform is determined, the waveform processing circuit has a very complicated configuration. An object of the present invention is to solve such a problem, and an object of the present invention is to propose a method for easily detecting a defective product having a small reversal rate in a winding step.

[0006]

In order to achieve this object, a winding reversal failure detecting method according to the present invention comprises rotating a plurality of magnets having the same shape, size and magnetic properties in a stator winding to be inspected. And the level of the induced voltage generated is measured and determined.

[0007]

According to this structure, the sum of the induced voltages generated by the individual magnets cancels each other and the total is 0 [V].
Select and arrange the polarity and position of each magnet so that
When this is rotated in the stator winding, the induced voltage cancels each other in the good winding and is almost 0 [V]. Voltage will be generated.

[0008]

An embodiment of the present invention will be described below.
FIG. 3 shows a pseudo rotor having a plurality of magnets (two magnets in this embodiment) of the present invention. 4A and 4B are examples of winding specifications of a stator to be inspected. FIG. 4A is a layout diagram of windings, and FIG. 4B is a wiring diagram of the windings.

The winding specification of the stator to be inspected is 4 shown in FIG.
In the case of a pole single-phase motor, as shown in FIG. 3, two magnets 8 and 9 having the same shape, size, and magnetic characteristics are provided on the surface of a pseudo rotor 7 made of a non-magnetic material such as resin. The surface of the magnet 8 is buried as a north pole and the magnet 9 is buried as a south pole so as to face 180 degrees.

FIG. 1 is a block diagram of a winding reversal failure detecting method according to the present invention. The pseudo rotor having the magnets 1 and 2 embedded therein is rotated within the stator winding 4 to be inspected. FIG. 2 shows an induced voltage waveform according to the present invention. The induced voltage generated in the winding is the sum of the induced voltages generated by the rotation of the magnet 1 and the magnet 2. FIG.
As shown in (a), in the non-defective winding, since the respective induced voltages cancel each other, the sum is almost 0 [V].

However, as shown in FIG. 2B, in an inverting defective winding, an induced voltage is generated because the balance canceling each other is lost at the position of the inverted coil. The level of the induced voltage is measured separately for the main winding and the auxiliary winding by the induced voltage measuring unit 6 such as a voltmeter, and is compared with a predetermined threshold value. Good,
The defect can be determined individually for each winding.

However, the gap between the pseudo rotor and the inner diameter of the stator, the shape, size, and magnetic characteristics of the magnet need to be optimized in advance according to the winding specifications of the stator.

[0013]

As described above, according to the present invention, it is possible to easily detect a partially inverted defective product of about 10 to 30% of one pole of the winding which could not be detected conventionally. In addition, since the induced voltage is directly measured by a voltmeter or the like, a complicated detection circuit is not required as compared with the conventional method, and the cost for manufacturing an inspection apparatus can be greatly reduced. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a winding reversal failure detection method of the present invention.

FIGS. 2A and 2B show an induced voltage waveform according to the present invention; FIG. 2A is a non-defective product waveform diagram of the induced voltage waveform according to the present invention; FIG.

FIG. 3 is a configuration diagram of a pseudo rotor of the present invention.

4A and 4B show examples of winding specifications of a stator to be inspected. FIG. 4A is a layout diagram of windings of the example of winding specifications of a stator to be inspected. FIG. Figure

FIG. 5 is a block diagram of a conventional winding reversal failure detection method.

6A and 6B show a conventional induced voltage waveform, and FIG. 6A is a non-defective product waveform diagram of the conventional induced voltage waveform of the conventional system.

[Explanation of symbols]

 1, 2, 8, 9, 14 Magnet 3, 15 Driving unit 4, 16 Stator winding to be inspected 5, 17 Induced voltage input terminal 6 Induced voltage value measuring unit 7 Pseudo rotor 10, 12, Main coil 11, 13 Auxiliary coil 18 Peak value measurement section 19 Distortion rate measurement section 20 Judgment section

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-119102 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01R 31/34 G01R 31/06

Claims (1)

(57) [Claims] 1. The sum of induced voltages generated by individual magnets on an inner peripheral portion or an outer peripheral portion of a stator formed by winding a winding.
Cancel each other out so that the total becomes 0 [V]
Select and arrange the polarity and position of each magnet, and
A method of detecting a winding reversal failure of a stator, which measures the induced voltage generated from the winding by rotating in a stator winding and detects a winding failure.