JPS61231471A - Apparatus for measuring magnetic characteristics of electromagnetic steel plate - Google Patents

Abstract

PURPOSE:To make it possible to economically measure characteristics almost same to that in the case of an actual machine motor within a short time, by superposing a test piece to the outside of a rotor core as a stator core in a freely rotatable manner to make the same similar to that assembled in the motor of an actual machine. CONSTITUTION:A rotary restriction force jig 12 such as a load connecting pulley is provided to a freely rotatable rotor core 1 and stator windings 4 vertically provided around the rotor core 1 so as to provided intervals are bent so as to allow the upper parts 4-1 thereof to approach the side of the shaft 2 of the rotor core 1 and the mounting and access of a test piece are facilitated. A plurality of the test pieces provided with notches for putting in the stator windings or allowing the same to face are superposed to the outside of the rotor core 1 in a freely detachable manner to form a stator core 8. As mentioned above, because the test pieces are laminated in a state putting in the stator windings 4, a rotary magnetic field becomes almost same as the case of the motor of an actual machine and the motor characteristics of the test pieces can be measured with extremely high accuracy.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an apparatus for measuring motor characteristics of electrical steel sheets.

(Prior art) The magnetic properties of non-oriented electrical steel sheets (hereinafter referred to as electrical steel sheets) used as motor materials are measured by the 25 cm Epstein test as specified in JIS C2550. The magnetic properties are known. However, when a motor is manufactured using the electromagnetic steel sheet as a material, the magnetic properties of the motor are different from those of the electromagnetic steel sheet itself.

That is, the actual situation is that the motor characteristics cannot be accurately determined from the magnetic property values measured on veneers collected from the rolling direction of the electrical steel sheet and the direction orthogonal to the rolling direction.

Another method for measuring magnetic properties is to collect a ring-shaped test piece from an electromagnetic steel sheet, wind a winding wire around the test piece, and apply a magnetic field to the test piece by winding the test piece. According to this, since it is formed into a ring shape, characteristic values having a somewhat better correlation with the magnetic characteristics of the motor can be obtained than in the Epstein test described above. However, even when measuring the magnetic characteristics in the ring shape, it is not possible to know the actual motor characteristics because the measurement is not performed under a rotating magnetic field.

(Problems to be Solved by the Invention) For this reason, the current state of the art is to measure the characteristics of electric steel sheet motors by manufacturing actual motors. Therefore, there is a problem in that it takes a long time to know the motor characteristics. Furthermore, when manufacturing an actual motor and investigating its characteristics: the amount of test material required to measure the characteristic values increases, which is uneconomical.

The object of the present invention is to provide a device that simulates a magnetic steel sheet incorporated into an actual motor and measures the motor characteristics in a short time and economically. Furthermore, the purpose of measuring the characteristics is to measure characteristics similar to C when using an actual motor.

(Means for Solving the Problems) The present invention will be described in detail below based on one embodiment with reference to the drawings.

In the drawings, 1 is a rotor core, and 2 is a shaft connected to both sides of the rotor core 1. 3 is a bearing, and the shaft 2
Both ends are rotatably supported. Reference numeral 4 denotes a stator winding, which is formed by, for example, a predetermined number of coiled copper wires, and is erected around the rotor core 1 at intervals. A small gap is provided between the stator winding 4 and the rotor core 1. The upper part a-t of the stator winding 4 is bent so as to approach the axis 2, making it easy to attach and take out a test piece to be described later.

A fixing agent 5 fixes the stator winding 4 to the mounting frame 6. 7 is a lead wire of the stator winding 4. 8 is a stator core, which is made by laminating test pieces 9 obtained by punching, for example, an electromagnetic steel sheet to be measured. Test piece 9
As shown in Figure 2, it is a circular ring group, and its ^ side has a notch 1.
0 is the interval. - The stator winding 4 enters or faces into the notch 10.

A pulley 11 is, for example, a synchro pulley, and the rotor core l is applied with a rotational force. Reference numeral 512 denotes a rotational restraint force jig 1, for example, a pulley for connecting a load, which applies a rotational restraint force when the rotor core I rotates. If no rotation restraining force is applied to the load coupling pulley 12, the rotor core 1 will rotate in an unloaded state. Further, 13 is a pedestal of the device, and 14 is an outer cylinder.

(Function) As described above, the stator windings 4 are erected around the rotor core 1 at one interval, and the stator windings 4. Since the upper part of the test piece 9 is bent toward the axis 2 of the rotor core 1, it becomes easy to stack the test pieces 9 around the stator winding 4 and to take them out after the measurement is completed.

In addition, since the test piece 9 is layered with the stator winding 4 inserted, the rotating magnetic field is C
Similarly, the motor characteristics of the test piece 9 can be measured with very high accuracy.

,Next, we will describe the measurement ,method. The test pieces 9 are laminated around the stator winding 4 to form the stator core 8, and then a voltage is applied to the stator winding to rotate the rotor core l via the synchro pulley 11. . At this time, the load connection pulley 12 first rotates in a no-load state without applying any restraining force, and obtains measured values such as voltage, current, power 3 rotation speed, temporary winding resistance, etc. at no-load. Apply a restraining force to the load connection pulley 12 and apply voltage to the stator winding 4, and measure the current value close to the rated current, the voltage, power, etc. at that time while the rotor core 1 is stopped rotating. After obtaining the values, known processing is performed together with the measured values to determine the motor's iron loss, copper loss, torque, rated current, slip, etc.

(Effects of the Invention) As described above, according to the measuring device of the present invention, material characteristics can be easily evaluated, and its industrial value is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the present invention, and FIG. 2 is a diagram showing an example of the shape of a test piece in one embodiment of the present invention. l...rotor core, 2...shaft, 3...bearing, 4...
...Stator winding, 5...Fixing agent, 6...Mounting frame, 7
... Lead wire, 8 ... Stator core, 9 ... Test piece, 10 ... Notch, 11 ... Synchro pulley, 1
2... Load connection pulley, 13... Frame, 14...
・Outer cylinder.

Claims (1)

[Claims] A rotor core that is freely rotatable and is provided with a rotation restraint jig, and a stator winding that is bent at its tip so as to approach the rotating shaft side of the rotor core and is erected at intervals around the rotor core. A magnetic steel plate characterized in that a plurality of test pieces each having a wire and a notch through which the stator winding is inserted or exposed are stacked removably on the outside of the rotor core to form a stator core. Characteristic measuring device.