JP2007143318A - Motor shaft adjusting jig and motor shaft adjusting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor shaft adjusting jig and a motor shaft adjusting method for eliminating the necessity for correcting the balance of a motor shaft after a motor is assembled. <P>SOLUTION: The motor shaft adjusting jig 4 is provided with a central circular opening 2 into which the motor shaft 6 is mounted, and formed with a cap structure having an inclined plane structure 3 concentrically disposed at a circumferential edge. An inside diameter of the inclined plane structure 3 is smaller than the diameter of an edge of a magnet 1 on a rotor 5 to be adjusted. The outside diameter of the inclined plane structure 3 is larger than the diameter of the edge of the magnet 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a motor shaft adjusting jig and a motor shaft adjusting method, and more particularly to a motor shaft adjusting jig and a motor shaft adjusting method that can eliminate the balance correction of a motor shaft after assembling a motor.

  In the manufacture of motors such as small servo motors and DC brushless motors, a magnet is conventionally attached to the motor shaft, but there is a clearance when the magnet and the shaft are bonded, and after bonding, there is a gap for the center of the rotating shaft. Misalignment occurs and unbalance occurs in the rotor balance. In order to correct this, conventionally, the amount of unbalance balance is measured using a correction device (balance machine), and the balance is corrected by the increase method or the decrease method.

  FIG. 4 is an explanatory diagram showing a conventional balance correction method using a cross-sectional view of the rotor. In the figure, for the balance correction of the rotor 35 to which the magnet 31 is bonded, a balance correction adhesive having a large specific gravity or a method of attaching an adhesive material is applied to the balance correction region 38 as an increasing method. Alternatively, as a weight reduction method, a method of mounting a part as a balance correction plate in advance for easy processing, or drilling an appropriate size and number of holes with a drill on the shaft itself has been adopted.

From the viewpoint of motor balance correction, for example, a technique (Patent Document 1) is disclosed in which a ceramic material balance ring is attached to the rotating shaft of a brushless motor and this is cut with a laser beam to balance the rotation of the rotor. Has been. This is an example of the weight loss method described above.
Japanese Patent Application Laid-Open No. 8-163814 "Brushless motor and rotor balance adjustment method"

  However, in any case, it is necessary to perform the adjustment work after the motor assembly, which is time-consuming and reduces the work efficiency. Moreover, in the case of the operation | work etc. which used the said drill, since a machining will enter in a process, the management labor burden increased.

  The problem to be solved by the present invention is to provide a motor shaft adjusting jig and a motor shaft adjusting method that can eliminate the balance correction of the motor shaft after assembling the motor, excluding the problems of the prior art. That is.

  As a result of studying the above problems, the inventor of the present application has newly invented a jig that can be adjusted at the same time during assembly, and found that the above problems can be solved by using this jig. That is, the invention claimed in the present application, or at least the disclosed invention, as means for solving the above-described problems is as follows.

(1) A jig for fitting a motor shaft to which a rotor is attached and used for adjusting the shaft, the jig being provided with a circular opening for mounting on the motor shaft at the center and at the periphery Has a cap-like structure in which an inclined surface structure coaxial with the circular opening is provided, and the inner diameter of the inclined surface structure is smaller than the diameter of the edge of the magnet on the rotor to be adjusted. The motor shaft adjusting jig, wherein the outer diameter is formed larger than the diameter of the edge of the magnet.
(2) The motor shaft adjusting jig according to (1), wherein the inclined surface structure faces inward.
(3) The motor shaft adjusting jig according to (1), wherein the inclined surface structure faces outward.
(4) A motor shaft adjustment method using two motor shaft adjustment jigs according to any one of (1) to (3), wherein one of the jigs is attached to the motor shaft, and the adjustment target The edge of the magnet on the rotor is brought into contact with the inclined surface structure without any gap, and then the other jig is mounted from the opposite side, and the edge of the magnet on the opposite side is attached to the inclined surface structure of the other jig. A method of adjusting a motor shaft, wherein the magnet and the rotor shaft can be adjusted to be in alignment with the motor shaft by adjusting the position of the magnet so as to be in contact with no gap.

  Since the motor shaft adjusting jig and the motor shaft adjusting method of the present invention are configured as described above, according to this, the motor shaft adjusting jig can be adjusted prior to adhesion of the magnet during motor assembly. Can be saved, and the work efficiency can be effectively improved. Further, not only the process can be simplified, but also the cost can be reduced.

Hereinafter, the present invention will be described in detail with reference to the drawings.
1A and 1B are a sectional view and a plan view, respectively, showing an embodiment of a motor shaft adjusting jig according to the present invention. Also,
FIG. 2 is a cross-sectional view showing a usage state of the motor shaft adjusting jig shown in FIGS. 1A and 1B. As shown in these figures, the jig 4 of the present invention is used for adjusting the shaft by being fitted to a motor shaft 6 to which a rotor 5 is attached. A circular opening 2 for mounting on the shaft 6 is provided, and a peripheral surface is formed in a cap-like structure in which an inclined surface structure 3 coaxial with the circular opening 2 is provided. The inner diameter of the inclined surface structure 3 is smaller than the diameter of the edge of the magnet 1 on the rotor 5 to be adjusted, and the outer diameter of the inclined surface structure 3 is larger than the diameter of the edge of the magnet 1. This is the main configuration.

  The specifications of the jig 4, that is, the outer diameter of the main body (4), the diameter of the circular opening 2, the inclination angle and length of the inclined surface structure 3, the thickness of the bottom, and the like are the specifications of the target motor. In addition, it can be designed appropriately. In addition, as long as the material has physical properties such as strength and hardness necessary for adjusting the shaft, an appropriate material such as a metal material including steel can be used.

  With this configuration, using the two motor shaft adjusting jigs 4 of the present invention, the motor shaft can be adjusted prior to bonding during the magnet bonding process in the motor assembling process as follows. That is, one jig 4 is mounted on the motor shaft 6 and the edge of the magnet 1 on the rotor 5 to be adjusted is brought into contact with the inclined surface structure 3 without a gap. Next, the other jig 4 is mounted from the opposite side, and the position of the magnet 5 is adjusted so that the edge of the magnet 1 on the opposite side contacts the inclined surface structure 3 of the other jig 4 without a gap. Then, the magnet 5 is bonded. By such a method, a motor in which the shafts of the magnet 1 and the rotor 5 are adjusted so as to be aligned with the motor shaft 6 can be obtained.

  The inclined surface structure 3 can be adjusted with respect to a rotor having a final outer diameter within a range corresponding to the formed width of the inclined surface. Therefore, as necessary, it is possible to design the outer diameter of the jig 4 of the present invention, the length of the inclined surface structure, and the like so as to be convenient for adjusting the motors of the same series having different sizes.

  FIG. 3 is a cross-sectional view showing a use state of another example of the motor shaft adjusting jig of the present invention. The inclined surface structure 3 of the motor shaft adjusting jig 4 illustrated in FIG. 2 is directed inwardly, but the present invention is not limited to this, and the inclined surface structure 3 as shown in FIG. The surface structure 23 may have an inclined surface facing outward.

  According to the motor shaft adjusting jig and the motor shaft adjusting method of the present invention, the shaft can be adjusted at the time of assembling the motor, so that no subsequent adjustment work is required, and labor saving and work efficiency can be improved. It is an invention with high utility value in manufacturing motors including small servo motors and DC brushless motors.

It is sectional drawing which shows the Example of the jig | tool for motor shaft adjustment of this invention. 1B is a plan view of the embodiment of FIG. 1A. FIG. It is sectional drawing which shows the use condition of the jig | tool for motor shaft adjustment shown to FIG. 1A and FIG. 1B. It is sectional drawing which shows the use condition about another example of the jig | tool for motor shaft adjustments of this invention. It is explanatory drawing which shows the conventional balance correction method using the cross-sectional view of a rotor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 21 ... Magnet 2, 22 ... Circular opening 3, 23 ... Inclined surface structure 4, 24 ... Motor shaft adjusting jig 5, 25 ... Rotor 6, 26 ... Motor shaft 7, 27 ... Bottom (for motor shaft adjustment) jig)
31 ... Magnet 35 ... Rotor 36 ... Motor shaft 38 ... Balance correction region

Claims (4)

A jig for fitting a motor shaft to which a rotor is attached to be used for adjusting the shaft, the jig having a circular opening for mounting on the motor shaft at the center and the circular shape at the periphery It has a cap-like structure with an inclined surface structure coaxial with the opening, and the inner surface of the inclined surface structure is smaller than the diameter of the edge of the magnet on the rotor to be adjusted, and the outer diameter of the inclined surface structure is A motor shaft adjusting jig, wherein the jig is formed larger than the diameter of the edge of the magnet. The motor shaft adjusting jig according to claim 1, wherein the inclined surface structure faces inward. The motor shaft adjusting jig according to claim 1, wherein the inclined surface structure faces outward. A motor shaft adjustment method using two motor shaft adjustment jigs according to any one of claims 1 to 3, wherein one of the jigs is mounted on the motor shaft and the magnet on the rotor to be adjusted is attached. The edge is brought into contact with the inclined surface structure without any gap, and then the other jig is mounted from the opposite side so that the edge of the opposite magnet is brought into contact with the inclined surface structure of the other jig without any gap. A method for adjusting a motor shaft, characterized in that the magnet and rotor shafts can be adjusted to be aligned with the motor shaft by adjusting the position of the magnet.