JPH0352819B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention uses the unbalance vector of a test object measured by a balance tester in multiple directions in preset correctable directions of the test object. This invention relates to a device for decomposing into vectors.

(b) Prior art When measuring the direction and magnitude of unbalance of a test object, that is, the unbalance vector, using a balance tester, and making corrections to the test object based on the results,
For example, there may be restrictions on the direction in which modifications can be made, such as the rotor of a motor, depending on the shape of the test object. In such a case, a method is usually adopted in which the obtained unbalance vector is decomposed into vectors in two directions on the correctable direction of the test object using a force component calculation circuit, and correction is made.

In addition, for test objects that require high-precision balancing, perform the balancing test again after the above-mentioned correction (first correction), and then perform the balancing test again based on the results.
The following corrections will be made. At this time, it is necessary to select the direction of the component force vector so that the secondary correction process does not overlap with the primary correction part that has been corrected by drilling or the like. Therefore, in conventional equipment,
As shown in Figure 1a, the direction of the component force vector during the primary correction is limited to every other direction among the correctable directions of the test object, and the secondary correction is limited to the remaining directions. method is adopted. However, in cases such as a 7-pole motor rotor, where the direction in which the test object can be corrected is a radial number, the above method cannot be used, and therefore secondary correction is not possible. If so, as shown in Figure 1b, it is necessary to limit the primary and secondary correction directions to the directions shown by solid lines and broken lines.In this case, when the unbalance vector exists in the area indicated by A in the figure, the solid line If we attempt to divide the force into vectors in the directions shown, the angle of the component force vectors will become large and the efficiency will drop significantly.

(c) Purpose The present invention has been made to solve the above-mentioned technical problem, and it is a method of correction that enables accurate secondary correction without reducing efficiency, even for test objects having an odd number of correctable directions. The purpose is to provide a component force calculation device for a test machine.

(d) Configuration The present invention is characterized by the provision of two sets of component force calculation circuits (first and second component force calculation circuits) that decompose the unbalance vector into component forces in two directions on the correctable direction of the test object. circuit), the first and second force component calculation circuits are configured to separate the direction of the component force to be resolved so that each covers the entire direction of the component force, and a discriminating means for determining the direction of the unbalance vector. , a selection means is provided for outputting the decomposition result of either one of the first and second force component calculation circuits as an unbalanced force component based on the determination result.

(e) Examples Examples of the present invention will be described below based on the drawings. FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention.

The unbalance vector detection device 1 receives an unbalance detection signal obtained by detecting vibrations caused by the rotation of the test object and a mark marked on the test object using a photocell or the like. A reference phase signal is input, and an unbalance vector is detected and output from the magnitude and direction of unbalance of the test object. The outputs thereof are introduced into first and second force component calculation circuits 2 and 3, and determination circuit 4, respectively. The first and second component force calculation circuits 2 and 3 each decompose the input vector quantity into two component force vectors in a preset direction and output them. The second component force calculation circuit 3 includes:
A phase shift circuit 5 is connected, whereby the second component force calculation circuit 3 is configured to be able to shift the setting direction of the component force vector. Further, the determination circuit 4 is a circuit that determines whether the direction of the detected unbalance vector is in a region at a predetermined angle in a predetermined direction with respect to the reference position of the test object (the above-mentioned mark attachment position). By actuating the switch 6, the output of the first component force calculation circuit 2 is selected when it is in the above region, and the output of the second component force calculation circuit 3 is selected when it is in the residual region. , configured to supply the correction device.

Next, the operation of the above embodiment will be described for the case where the number of correctable directions of the test object is an odd number.
Assume that the test object is a 7-pole motor rotor as shown in FIG. 3a. Therefore, the test object has correctable directions on the seven poles a to g. In this case, the setting directions of the component force vectors of the first and second component force calculation circuits 2 and 3 are set, for example, every other pole clockwise with respect to the reference mark position. Then, the phase shift circuit 5 shifts the setting direction of the component force vector of the second component force calculation circuit 3 by 2π/7. The determination circuit 4 uses the first component force calculation circuit 2 when the direction of the unbalance vector is in the region , and in the region , in FIG.
The component force calculation circuit 3 is selected. As a result, during the primary correction, when the direction of the unbalance vector is in the region, the first component force calculation circuit 2 decomposes it into component force vectors on poles a and c, and the correction device Correction processing is performed. If it is in the region, it is similarly decomposed into component force vectors on poles c and e. In the region , the second component force calculation circuit 3 decomposes the force into component force vectors on the poles d and f, and in the region , it is similarly decomposed into component force vectors on the poles f and a. In this way, even if the test object has an odd number of correctable directions, it will always be decomposed into component force vectors in every other correctable direction, and the direction in which the reference mark is marked will be interposed. No component force vectors appear in the two directions, ie, the correctable directions on the poles b and g. Therefore, if the reference mark used in the secondary correction is moved onto the pole that is sandwiched between the two poles that were corrected in the primary correction, the correction made in the secondary correction will be the same as in the primary correction. It never overlaps with the modification department. That is, as shown in FIG. 3b, for example, when correction processing is performed on poles a and c in the primary correction, the reference mark is moved onto the pole b in the secondary correction. This way, no component force vectors will appear on the a and c poles, and therefore no quadratic corrections will be made on these poles.

Note that if the number of correctable directions of the test object is an even number, if the phase shift circuit 5 does not shift the phase of the second component force calculation circuit 3, it is possible to The component force vector is limited in the direction.

In the above embodiment, when the number of correctable directions is an odd number, the phase of the second component force calculation circuit 3 is shifted by the phase shift circuit 5. The setting direction of the component force vector of the force calculation circuit is set in the first direction with respect to the reference mark position.
Similar results can be obtained by setting every other pole in the opposite direction to the component force calculation time.

(f) Effects As explained above, according to the present invention, two sets of component force calculation circuits that decompose an unbalance vector into two component forces in the correctable direction are provided, and the component force calculation circuits are used to calculate the component force by each component force calculation circuit. A determination circuit for determining the direction of the unbalanced vector and a selection circuit for outputting one of the calculation results by the two sets of component force calculation circuits as an unbalanced component force based on the determination result, are provided. Since the output of the component force calculation circuit corresponding to the direction of the unbalance vector, that is, the two component forces in the direction corresponding to the direction of the unbalance vector, is adopted as the unbalance component force, even for a test object with an odd number of correctable directions, 1 Accurate secondary correction is now possible without overlapping the next correction area and the secondary correction area. Further, since the angle formed by the component force vector is always constant regardless of whether it is primary or secondary, there is no problem that the correction efficiency changes depending on the direction of the unbalance vector.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the operation of a conventional component force calculation device.
FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention;
FIG. 3 is an explanatory diagram of its operation. 1... Unbalance vector detection circuit, 2... First component force calculation circuit, 3... Second component force calculation circuit,
4... Judgment circuit, 5... Phase shift circuit, 6...
Switch.

Claims (1)

[Claims] 1 In a device that decomposes the unbalance vector of the test object detected by a balance tester into a plurality of component force vectors in preset correctable directions of the test object, The first step is to decompose the force into two predetermined force components in the correctable direction.
a second component force calculation circuit that decomposes the unbalance vector into component forces in two directions on the correctable direction of the test object and different from the first component force calculation circuit; a discrimination circuit for discriminating the direction of the unbalance vector; and a selection means for selecting either one of the first and second component force calculation circuits based on the discrimination result and outputting the calculation result as an unbalance vector component force. A component force calculation device in a balance testing machine, characterized by comprising: