JP2932800B2 - How to measure rotor stray load loss - 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 measuring the stray load loss of a motor rotor, particularly at a manufacturing site.

[0002]

2. Description of the Related Art In recent years, in measuring the characteristics of a motor, an actual load has been applied to the motor under test, and various data have been processed by a computer to automatically display various characteristics. The value of the stray load loss was measured from a part of the various characteristic data obtained by such an apparatus. Hereinafter, the conventional electric motor characteristic measuring device described above will be described with reference to the drawings. FIG. 2 shows a system configuration of a conventional electric motor characteristic measuring device. In FIG. 2, a motor under test 21 whose characteristics are to be measured is connected via a torque detector 22 to a load device 23 having a rotation detector 24 at the rear thereof. The test power supply 25 is electrically connected to the motor under test 21 and the computer 26. Computer 26
Indicates a torque detector 22, a rotation detector 24 and a peripheral device 2
7 are also electrically coupled. In the above configuration, a power is applied to the motor 21 to be tested and rotated, and a load is applied by the load device 23. Various signals at that time are transmitted to the computer 26.
And the calculation result is output to the peripheral device 27 as a chart or a data table.

[0003]

In such a conventional characteristic measuring apparatus, setting the motor under test in this apparatus requires a considerable amount of time for centering and the like. In addition, since large-scale equipment such as a load device, a computer, and a peripheral device is required, it is not suitable for a site. In addition, it is necessary to assemble the rotor to a state where the motor is completed.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a method for measuring a stray load loss of a rotor alone.

[0005]

In order to achieve the above object, the present invention provides a method for measuring a stray load loss of a rotor, comprising: a stator having windings wound thereon; A measuring device comprising a rotatably supported cantilever shaft, a torque detector connected to the bearing device side of the shaft and an external drive motor, rotates around a measured rotor fitted to the stator with the shaft. Stop and mount from the opposite bearing side, drive the shaft at a constant speed with an external drive motor, apply a predetermined voltage to the stator, measure the torque generated by the measured rotor at the constant speed with a torque detector, If the measured torque is smaller than the predetermined reference torque, the difference between the reference torque and the measured torque is determined to be the stray load loss of the measured rotor.

[0006]

According to the present invention, the stray load loss can be measured by the rotor alone with the above configuration.

[0007]

An embodiment of the present invention will be described below with reference to FIG. As shown in the figure, a device for measuring stray load loss includes a stator 2 compatible with a rotor 1 to be measured,
Shaft 3 having one end rotatably supported by a bearing device 9 and a torque detector 5 connected to the bearing device side of the shaft 3;
And an external drive motor 6 connected to the bearing device side of the vehicle. The external drive motor 6 transmits a driving force to the shaft 3 via the belt 7. The rotor 1 to be measured is inserted into the shaft 3 from the non-bearing side and is stopped from rotating. A tailstock 4 is arranged to prevent runout on the side opposite to the bearing. The electric signal of the torque detector 5 and the current flowing through the stator 2 are input to the measuring unit 8.

The operation of the above construction will be described. The rotor 1 to be measured is inserted into the shaft 3 and is prevented from rotating. Thereafter, the external drive motor 6 rotates the shaft 3 at a constant rotation speed at which the stray load loss is most likely to occur. At the same time, a predetermined voltage is applied to the stator 2, and a torque detector 5 measures a rotation torque generated by the measured rotor 1 at the above-mentioned constant rotation speed. The measuring unit 8 takes in the measured value of the torque detector 5 and compares it with a preset reference torque. If the measured torque is smaller than the reference torque, the measuring unit 8 determines the difference between the reference torque and the measured torque. And the product is sorted out.

[0009]

As is apparent from the above description, the method of the present invention can be easily measured, so that it is suitable for measuring a stray load loss of a rotor at a manufacturing site.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a measuring method according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a conventional measurement method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor to be measured 2 Stator 3 Shaft 5 Torque detector 6 External drive motor 9 Bearing device

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01L 3/00 G01L 5/00

Claims (1)

(57) [Claims] 1. A stator on which windings are wound, a cantilever shaft penetrating through the center of the stator and having one end rotatably supported by a bearing device, and a torque detector connected to the bearing device side of the shaft. And a measuring device equipped with an external drive motor, a rotor to be measured that is compatible with the stator is prevented from rotating around the shaft and mounted from the opposite bearing side,
The shaft is driven at a constant speed by an external drive motor, and a predetermined voltage is applied to the stator, and the torque generated by the measured rotor at the constant speed is measured by a torque detector, and the measured torque is smaller than a predetermined reference torque. In this case, a method for measuring the stray load loss of the rotor, wherein the difference between the reference torque and the measured torque is regarded as the stray load loss of the measured rotor.