JP2003092859A - Pole alignment method of encoder for ac servo motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pole alignment method of an encoder for an AC servo motor wherein vibration is restrained when the motor is driven by eliminating deformation of a hollow shaft, and workability can be improved when the encoder is attached. SOLUTION: In the pole alignment method of the encoder 8 which is linked with a rotor 11 of the AC servo motor, the rotor 11 of the motor is set as a locked state at a prescribed phase, and alignment between a hole 2 for positioning and a pole plunger 1 is performed. The hole is arranged in the center direction of a diameter in the rotor 11 of the motor. The pole plunger 1 has an elastic member 9 from which the same phase output of the encoder 8 is outputted when the member 9 coincides with a plate spring 9 for attaching the encoder at a specified position and which member 9 is arranged on the hollow shaft 13 of the encoder 8.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for aligning a pole of an encoder for an AC servomotor. 2. Description of the Related Art As shown in FIG. 4, a pole of an encoder for a conventional AC servomotor is first locked with a rotor 11 of a motor in a predetermined phase, for example, a U-phase. The marking wire 5 is inserted into the leaf spring mounting portion, the stopper ring 10 having the projection 6 which is convex in the axial direction is mounted on the rotor 11 of the motor, and the lock is released. Next, the protrusion of the stopper ring 10 is provided on the slotted portion 7 of the hollow shaft 13 adjusted so that the U-phase output of the encoder is output when the plate spring 9 and the specific position B (the notch 4) coincide with each other. Insert 6. After that, the encoder 8 was fixed to the motor at a position where the cutout line 5 of the leaf spring attachment portion and the cutout 5 of the leaf spring 9 matched, and then the rotor 11 and the hollow shaft 13 were fixed with the set screw 12. However, in the prior art, the roundness of the hollow shaft is reduced by providing a slot on the hollow shaft portion of the encoder, so that the hollow shaft is fitted to the rotor. Due to the unbalanced gap, the encoder oscillates when the motor is driven, causing a problem that vibration occurs. In addition, since the machining accuracy of the slot of the hollow shaft and the projection of the stopper ring cannot be obtained, there is a problem in assembling workability that the projection interferes with the slot. Thus, the present invention eliminates deformation of the hollow shaft, suppresses vibration during motor driving, and
A that can improve workability when mounting the encoder
It is an object of the present invention to provide a pole alignment method for an encoder for a C servomotor. [0004] In order to solve the above-mentioned problems, the present invention relates to a method of aligning a pole of an encoder connected to a rotor of an AC servomotor, wherein the rotor of the motor is locked in a predetermined phase. And a positioning hole provided in the center direction of the diameter of the rotor of the motor, and a hollow shaft portion of the encoder which outputs an in-phase output of the encoder when the position matches a specific position with the leaf spring for encoder mounting. The positioning is performed with a projection of a ball plunger having a spring function. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the present invention.
(A) shows a state before assembling, and (b) shows a state after assembling. 2A and 2B are side sectional views of a main part showing an embodiment of the present invention. FIG. 2A shows a state before the hollow shaft and the rotor are connected, and FIG. 2B shows a state after the connection. FIG. 3 is a perspective view of a stopper ring showing an embodiment of the present invention. As shown in FIG. 1, after locking the rotor 11 of the motor in a predetermined phase, for example, the U phase, the marking wire 5 is inserted into the leaf spring mounting portion, and the hole 11 for positioning the rotor 11 of the motor toward the center of the diameter. 2 is provided and the lock is released. At this time, the positioning hole 2 is provided directly on the rotor 11 as shown in FIG. 2 or by inserting a stopper ring 10 provided with the hole 2 in the center direction of the diameter as shown in FIG. Next, leaf spring 9
Plunger 1 having a spring 3 as an elastic body provided on hollow shaft 13 and being adjusted so that the U-phase output of encoder 8 is output when it coincides with a specific position A (notch 4). Positioning with the side positioning hole 2 is performed. Ball plunger 1 as shown in FIG.
Has the spring 3, so that when the rotor 11 is inserted into the hollow shaft 13, the rotor 11 moves toward the hollow shaft 13, so that the rotor 11 can be inserted without interfering with the rotor 11. Next, the marking line 5 of the leaf spring mounting portion and the leaf spring notch 4
After the encoder 8 is fixed to the motor at the position where coincides, the rotor 11 and the hollow shaft 13 are fixed with the set screw 12. By doing so, the hollow shaft 13 of the encoder 8 is free from slotting, so that deformation of the hollow shaft 13 can be eliminated and vibration during motor driving can be suppressed. Further, since the hole 2 of the rotor 11 and the portion where the ball plunger 1 provided on the hollow shaft 13 is mounted are formed by holes, machining accuracy is easily obtained, and the positioning of the ball plunger 1 and the hole 2 is performed by the rotor. By rotating the hollow shaft 11 or the hollow shaft 13, the positioning becomes possible, so that the positioning becomes easier and the workability at the time of mounting the encoder is improved as compared with the case where the protrusion of the stopper ring is inserted into the slotted portion of the prior art. Greatly improved. As described above, according to the present invention, the rotor of the motor is locked in the U-phase, and the hole provided in the center of the diameter of the rotor of the motor and the encoder mounting hole are provided. Of the encoder when it matches with the leaf spring
Since the pole alignment is performed by aligning with the ball plunger having an elastic body provided on the hollow shaft part of the encoder that outputs the phase output, vibration during motor driving is suppressed, and work during encoder installation is performed. Properties can be greatly improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of the present invention, wherein (a) shows a state before assembly and (b) shows a state after assembly. FIG. 2 is a side sectional view of a main part showing an embodiment of the present invention;
(A) shows the state before the connection between the hollow shaft and the rotor, and (b) shows the state after the connection. FIG. 3 is a perspective view of a stopper ring showing the embodiment of the present invention. 4A and 4B are perspective views showing a conventional technique, in which FIG. 4A shows a state before assembling, and FIG. 4B shows a state after assembling. [Description of Signs] 1 Ball plunger, 2 holes, 3 Spring (elastic body), 4 Notch, 5 Marking line, 6 Projection, 7 Slot, 8 Encoder, 9 Leaf spring, 10 Stopper ring, 11 Rotor, 12 Set screw, 13 hollow shaft

Claims (1)

Claims 1. A method of aligning a pole of an encoder connected to a rotor of an AC servomotor, wherein the rotor of the motor is locked in a predetermined phase, and the rotor of the motor is provided in a center direction of a diameter. The positioning hole is aligned with a ball plunger having an elastic body provided on a hollow shaft portion of the encoder which outputs an in-phase output of the encoder when the positioning hole matches the encoder mounting leaf spring at a specific position. A pole alignment method for an encoder for an AC servomotor, characterized in that: