JPH08110349A - Method for detecting rotary direction of motor - Google Patents

Abstract

PURPOSE: To detect the inversion failure in rotary direction of a completed product of a motor due to the improper connection of a stator coil by a stator only. CONSTITUTION: Current is fed to a main coil 13 and a sub coil 14 of a stator 11 to be inspected by a 90-degree phase biphase power supply 12. The leakage magnetic flux generated by the current is detected by magnetic flux detectors 15 and 16. The detection signal has a 90-degree phase difference and the advance/delay of the phase are inverted depending on the rotary direction. Therefore, by judging the advance/delay of phase using a rotary direction (phase) detector 17 based on the detection signal, the rotary direction can be simply detected by a single stator without any drive part such as a pseudo rotor and without inserting the pseudo rotor into the stator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inspecting a rotating direction of a motor by a single stator in a motor stator manufacturing process.

[0002]

2. Description of the Related Art A conventional method for detecting a rotation direction of a motor will be described below.

FIG. 2 shows a conventional method for detecting a rotational direction reversal failure due to a mistake in connection to a stator winding of a single-phase motor in a motor manufacturing process. In FIG. 2, 1 is a stator to be inspected, 2 is a pseudo rotor, 3 is a tacho-generator, 4
Is a voltage comparator, 5 is a two-phase power supply, 6 is a main coil, 7
Is an auxiliary coil. 90 degree phase difference of 2
A phase power source is applied to excite the main coil 6 and the auxiliary coil 7 to insert the pseudo rotor 2 into the stator 1 to be inspected, and the pseudo rotor 2 is actually rotated. The pseudo rotor 2 is directly connected to the tachogenerator 3, and the tachogenerator 3 outputs a voltage as the pseudo rotor 2 rotates. The polarity of this output voltage is determined by a voltage comparator to detect the rotation direction of the motor.

[0004]

However, in this method, it is necessary to insert the pseudo rotor in the stator,
It takes time to set the insertion jig and adjust the gap between the stator and the pseudo rotor. Further, since the rotor is actually rotated, a large starting current flows through the inspected stator, so that a power source with a large power source capacity is required, and it takes time until the pseudo rotor rotates.

The present invention solves these problems and provides a simple method for detecting the direction of rotation with a single stator.

[0006]

According to the method for detecting the rotational direction of the present invention, a current is passed through a stator coil to be inspected by a two-phase power source, a magnetic flux leaked from the stator is detected, and the rotational direction is detected by the phase relationship of the detection signals. This is a detection method.

[0007]

In the above method, since the rotational direction is detected by detecting the leakage magnetic flux, a drive unit such as a pseudo rotor is not required and the pseudo rotor is not inserted inside the stator, so that the jig structure is simplified. It is not necessary to apply a large current of about the starting current to the stator coil, and since the rotor is not rotated, it is possible to detect the rotation direction in a short time without waiting for the rotor starting time.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a method for detecting the rotation direction of a single-phase motor stator according to the first embodiment of the present invention. In FIG. 1, 11 is a stator to be inspected, 12 is a two-phase power supply, 13 is a main coil, 14 is an auxiliary coil, 15 and 16 are magnetic flux detectors,
Reference numeral 17 is a rotation direction (phase) detector.

With this configuration, a current is caused to flow through the main coil 13 and the auxiliary coil 14 of the stator 11 to be inspected by a two-phase power source having a 90-degree phase difference, and the leakage magnetic flux generated from the stator 11 to be inspected is supplied to the magnetic flux detectors 15 and 16. To detect. Magnetic flux detector 1
When the output signals of 5 and 16 are set so as to have a phase difference of 90 degrees, the phase advance / delay is reversed depending on the rotation direction. Therefore, the rotation direction (phase) detector 17 discriminates the phase advance / delay. By doing so, the rotation direction can be detected.

FIG. 3 shows a block diagram of the XY integrated magnetic flux detector of the second embodiment of the present invention. In FIG. 3, 21 is X
-Y integrated magnetic flux detectors, 22 and 23 are X-direction magnetic flux detection coils, 24 and 25 are Y-direction magnetic flux detection coils, and 26 is a magnetic flux detector case. The X-Y integrated magnetic flux detector 21 is replaced with the magnetic flux detectors 15 and 16 of the first embodiment of the present invention. The XY integrated magnetic flux detector 21 is easier to set than the magnetic flux detectors 15 and 16 because it is an integrated type.

FIG. 4 shows a block diagram of the method for detecting the rotation direction of the three-phase motor stator according to the third embodiment of the present invention. In FIG. 4, 31 is a supplementary inspection stator, 32 is a three-phase power supply, 33 is a motor coil 35, 36 is a magnetic flux detector, and 37 is a rotation direction (phase) detector. The third embodiment is for detecting the direction of rotation with respect to the three-phase motor stator, in which the two-phase power supply 12 of the first embodiment is replaced with a three-phase power supply 32, and the detection principle is the same as that of the first embodiment. It is the same as the phase motor stator rotation direction detection.

[0013]

As described above, the rotating direction detecting method of the present invention does not require the pseudo rotor and does not need to insert the pseudo rotor into the stator, so that the rotating direction can be easily detected by the stator alone. Further, since it is not necessary to wait for the rotor start-up time, the rotation direction detection time can be greatly shortened, which is a very effective detection method in practice.

Furthermore, when the XY integrated magnetic flux detector of the second embodiment is used, the setting of the magnetic flux detector becomes easier.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a method for detecting a rotation direction of a single-phase motor stator according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional rotation direction detection method.

FIG. 3 is a configuration diagram of an XY integrated magnetic flux detector according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a rotation direction detecting method for a three-phase motor stator according to a third embodiment of the present invention.

[Explanation of symbols]

 1, 11, 31 Inspected stator 2 Pseudo rotor 3 Tacho generator 4 Voltage comparator 5, 12 Two-phase power source 6, 13 Main coil 7, 14 Auxiliary coil 15, 16, 35, 36 Magnetic flux detector 17, 37 Rotation direction (phase ) Detector 21 XY integrated magnetic flux detector 22,23 X-direction magnetic flux detection coil 24,25 Y-direction magnetic flux detection coil 26 Magnetic flux detector case 32 Three-phase power supply 33 Motor coil

Claims (2)

[Claims] 1. A stator formed by winding a plurality of phases of windings,
A motor that applies a voltage with a predetermined phase difference from a multi-phase power supply to each phase, detects the leakage magnetic flux from the stator with multiple search coils, and detects the rotation direction of the motor with the stator alone by the phase difference of the magnetic flux Rotation direction detection method. 2. A stator formed by winding windings of a plurality of phases,
A voltage with a predetermined phase difference is applied to each phase from a multi-phase power source, and the magnetic flux leaking from the stator is detected by a search coil that integrates the X and Y directions. Motor rotation direction detection method that detects the stator alone.