JP3925204B2 - Assembly method of motor with sensor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for assembling a motor having a sensor capable of recognizing an origin position.
[0002]
[Prior art]
In recent years, servo motors are frequently used as drive sources for industrial equipment, and optical encoders and resolvers are mainly used as position and speed detection sensors.
[0003]
This sensor is configured so that the origin position can be recognized, and the origin is used as a reference position for excitation timing and detection signals.
[0004]
For example, if the excitation timing is determined based on this origin position, the origin position of the sensor rotating part and the rotor magnet magnetic pole position of the motor are divided into the origin position of the sensor fixing part and the stator magnetic pole position of the motor, respectively. Need to be positioned.
[0005]
Here, a conventional assembly process and configuration of a servo motor using a resolver as a sensor will be described with reference to the drawings.
[0006]
In FIG. 3, first, after the rotor magnet is bonded and fixed to the motor shaft, the rotor magnet is magnetized. Next, after the bearing is mounted on the motor shaft, the motor portion is completed by incorporating the stator and the bracket. After the motor was completed, the resolver rotor was temporarily fixed to the motor shaft and the resolver stator was temporarily fixed to the motor bracket, and then the origin positions of the resolver and the motor were aligned based on the excitation timing.
[0007]
Here, the origin adjustment (positioning method) after the resolver stator is temporarily fixed to the bracket of the motor will be described.
[0008]
In FIG. 4, when a direct current is passed through the two phases of the stator winding 43 which are star-connected, the stator core 44 becomes an electromagnet, and the rotor stops at a position where the magnetic poles of the magnetic poles of the rotor magnet 45 are attracted and balanced.
[0009]
Here, the origin 41 of the resolver rotor is fixed to the motor shaft in accordance with a specific position of the stator core, and then the resolver stator is rotated in the circumferential direction so that the origin 42 of the resolver stator coincides with the origin 41 of the resolver rotor. Fixed and adjusted the origin.
[0010]
The resolver stator and the resolver rotor, the resolver stator and the motor bracket, and the resolver rotor and the motor shaft are combined separately.
[0011]
[Problems to be solved by the invention]
However, the above-described conventional motor and sensor origin adjustment process is required twice for the rotor side and the stator side, each of which is complicated and complicated.
[0012]
In addition, it is necessary to keep the positions of the lead wires of the motor and sensor within a certain range in terms of handling.
[0013]
The present invention solves the above-described conventional problems, and an object of the present invention is to provide an assembly method that can reduce the man-hour for adjusting the origin position.
[0014]
[Means for Solving the Problems]
In order to solve the above-described problems, a method for assembling a motor with a sensor according to the present invention includes a brushless resolver that can recognize the origin, a rotor that includes a motor shaft and a ring-shaped magnet, a bracket that supports the rotor via a bearing, comprising a mounting bearing and the bracket to the resolver mounting side of the motor shaft, comprising: a first step of fixing a resolver rotor on the motor shaft, and a second step of magnetizing the magnet relative to the origin of the resolver rotor In the first step, the resolver stator frame is integrated with the bracket, and the positional relationship between the resolver stator origin and the stator magnetic pole is kept constant .
[0015]
DETAILED DESCRIPTION OF THE INVENTION
In order to solve the above-mentioned problems, a method for assembling a motor with a sensor according to claim 1 is a brushless resolver capable of recognizing the origin, a rotor having a motor shaft and a ring-shaped magnet, and supporting the rotor via a bearing. A first step of mounting a bearing and a bracket on the resolver mounting side of the motor shaft, and fixing the resolver rotor to the motor shaft; and a second step of magnetizing the magnet with reference to the origin of the resolver rotor In the first step, the frame of the resolver stator is integrated with the bracket, the positional relationship between the resolver stator origin and the stator magnetic pole is kept constant , and the magnet is magnetized with reference to the resolver rotor origin. There is no variation in the origin and magnetic pole position, and it can also serve as the origin position adjustment process. .
[0016]
Further, it is possible to eliminate the resolver stator and the stator of the home position adjusting step.
[0017]
【Example】
Hereinafter, as an example of the present invention, a sensor-equipped motor using a brushless resolver will be described with reference to the drawings as a representative of a rotation sensor capable of recognizing an origin.
[0018]
In FIG. 1, 1 is a motor shaft, 2 is a ring-type magnet, 3 is a bearing, 4 is a bracket, and 5 is a brushless resolver.
[0019]
The brushless resolver 5 is a sensor that converts a rotor angular position into an electric signal by electromagnetic induction, and includes a resolver stator portion 5a and a resolver rotor portion 5b. For example, a brushless resolver 5 having two-phase input and one-phase output constitutes a rotary transformer section 5c with a transformer fixed winding and a rotary winding, and two resolver stator windings and transformer fixed windings that are spatially shifted by 90 °. Constitutes the resolver stator portion 5a. Further, the rotating winding and the resolver rotor winding constituting the rotating transformer unit 5c are connected to form a closed loop to form the resolver rotor unit 5b, and the resolver rotor unit 5b is fixed to the motor shaft.
[0020]
The resolver stator portion 5a is centered with respect to the motor shaft and fixed to the bracket. The resolver stator portion 5a is configured together with two stator windings that are spatially shifted by 90 ° and the fixed winding of the rotary transformer portion 5c. The resolver rotor portion 5b is connected to the rotary winding and the rotor portion winding. It is closed loop and fixed to the motor shaft. The stator portion and the transformer fixed winding are fixed to the bracket with reference to the motor shaft.
[0021]
Next, the assembly process of the resolver motor will be described with reference to FIG. First, the magnet 2 is fixed to the motor shaft 1. Next, the bearing 3 is inserted into the motor shaft 1 to which the sensor is attached, and the bracket 4 is fitted and attached to the outer ring of the bearing 3. And the motor shaft 1 and the resolver rotor part 5b are fixed to the axial predetermined position (it is arbitrary in the rotation direction). This is the first step.
[0022]
In the second step, the magnet 2 is magnetized with reference to the origin of the resolver rotor portion 5b. The magnet 2 has a radially oriented ring shape and can be magnetized at any position in the circumferential direction.
[0023]
By the way, the resolver origin is an electrical origin constituted by the resolver rotor portion 5b and the resolver stator portion 5a. However, the resolver origin is achieved by using a jig that utilizes the mechanical positional relationship between the slot position on the outer periphery of the resolver rotor core and the origin. Magnetic work can be facilitated. Thus, by magnetizing on the basis of the origin of the resolver rotor portion 5b, there is no variation between the origin and the magnetic pole position, and it can also serve as an origin adjustment step.
[0024]
After that, as in the prior art, the stator is attached to the bracket 4 to complete the motor assembly, and the stator core becomes an electromagnet by applying a direct current to the two phases of the stator winding. The rotor is stopped at a position where the magnetic pole and the magnetic pole of the rotor magnet are attracted and balanced. At this time, it may be fixed so that the origin of the resolver stator portion 5a is aligned with the origin of the resolver rotor portion 5b.
[0025]
By the way, if the origin of the resolver stator part 5a can be maintained at a specific position in the circumferential direction of the bracket 4 (that is, if the resolver stator frame and the bracket are integrated), the origin of the resolver rotor part 5b and the resolver stator. The step of aligning the origin of the part 5a can also be omitted. It is necessary to determine in advance the excitation timing of the stator winding with respect to the magnet magnetic pole position with reference to the origin of the sensor.
[0026]
In other words, the position of the motor bracket and the stator magnetic pole is fixed by preliminarily determining the positional relationship in the circumferential direction by means of concave and convex fitting, etc., and the positional relationship in the circumferential direction is kept constant by integrating the bracket and the resolver stator frame. it can. Thus, the origin position adjustment process is completed by simply magnetizing the magnet with reference to the resolver rotor origin.
[0027]
Although described with the resolver, the same can be implemented by magnetizing with reference to the Z signal in the optical encoder.
[0028]
【The invention's effect】
As apparent from the above embodiment, according to the invention described in claim 1 , by magnetizing the magnet with reference to the resolver rotor origin, there is no variation between the origin position of the resolver rotor and the magnet magnetic pole position, Magnetization can also be used to adjust the origin position.
[0029]
Further , by integrally configuring the resolver stator so that the origin of the resolver stator is constant with respect to the bracket, the origin adjustment related to the resolver stator can be reduced.
[0030]
Thus, the man-hour for the origin adjustment for the rotor and the stator can be reduced, and the origin adjustment process can be eliminated by using them together.
[Brief description of the drawings]
FIG. 1 is a structural diagram of an embodiment of the present invention. FIG. 2 is an explanatory diagram of an assembly process in an embodiment of the present invention. FIG. 3 is an explanatory diagram of an assembly process in a conventional resolver motor. Illustration of origin position adjustment in resolver motor [Explanation of symbols]
1 Motor shaft 2 Magnet 3 Bearing 4 Bracket 5 Resolver (sensor)
5a Resolver stator part 5b Resolver rotor part

Claims (1)

A brushless resolver that can recognize the origin, a motor shaft and a rotor including a ring-shaped magnet, and a bracket that supports the rotor via a bearing, and the bearing and bracket are mounted on the resolver mounting side of the motor shaft, A first step of fixing the resolver rotor to the motor shaft; and a second step of magnetizing the magnet with reference to the origin of the resolver rotor . In the first step, the resolver stator frame is integrated with the bracket, A method for assembling a motor with a sensor in which the positional relationship between the stator origin and the stator magnetic pole is kept constant .

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