JPH0634565B2 - Resolver Stator fixing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for mounting and fixing a stator of a composite resolver which is applied to speed adjustment, positioning, etc. of a rotating body, particularly a rotating shaft of an electric motor.

[Conventional technology]

FIG. 2 is a side view showing a structure of a resolver attached to a conventional electric motor with a part cut away.

In this case, it is a composite resolver equipped with two resolvers in order to improve the detection accuracy.

An electric motor shaft 10 rotatably supported by a bearing 15 supported by a fixed portion of the electric motor 1 is provided on the rotor side of the resolver.
The first rotor 7 and the second rotor 8 are both positioned via a sleeve 9 and fixed by rings 16 and 17 having an L-shaped radial cross section.

On the stator side of the resolver, the first stator 3 is first inserted into the inner peripheral surface of the shaft 10 of the frame 2 on the side of the terminal and abutted against a step to be fixed, and then the positioning and the first fixation of the second stator 4 are performed. The shield plate 5 having a T-shaped cross section for shielding the mutual magnetic force between the child 3 and the second stator 4 is inserted and fixed, and then the second stator 4 is inserted and fixed, and the frame 2 is fixed to the electric motor by the bolt 18. Screw it to the fixed part.

In order to shield the influence of the magnetic force from the rotational force generating portion of the electric motor on the resolver, a donut-shaped disc shield plate 6 is bonded to the end surface of the electric motor facing the second stator and rotor.

In this case, the first stator 3 and the second stator 4 are the frame 2
It is shrink-fitted or glued.

In the case of shrink fitting, the inner diameter of the frame 2 is provided with a certain amount of interference, the frame 2 is heated and expanded, and the first stator 3, the shield plate 5, and the second stator 4 are inserted in order, and the room temperature is reached. Then, the temperature of the frame 2 is lowered to fix the two stators 3 and 4 and the shield plate 5.

Further, in the case of adhesion, the first stator 3 having an outer peripheral surface coated with an adhesive is inserted and fixed to the frame 2. Hereinafter, the shield plate 5 and the second stator 4 are similarly mounted and fixed.

In addition, 11 and 13 are detection coils wound around the stator,
Reference numerals 2 and 14 are their leader lines.

[Problems to be solved by the invention]

By the way, there is the following problem in shrink fitting or adhesion.

In the case of shrink fitting By shrink fitting, tensile stress acts on the frame 2 and compressive stress acts on the stator.

However, the stress acting on the stator becomes non-uniform due to the accuracy of parts in the manufacturing process and the deformation of the stator due to internal stress. An unbalanced magnetic property causes an imbalance in the magnetic characteristics, a phase error occurs in the resolver, and an accurate signal cannot be detected.

Further, as a shrink fit means, the first stator 3 shrink fit → the shield plate 5 shrink fit → the second stator 4 shrink fit is conceivable. In this procedure, the first stator 3 shrink fit After the fitting, when the shield plate 5 and the second stator 4 are shrink-fitted, the first stator 3 as well as the frame 2 must be heated again, which adversely affects the first stator 3.

Therefore, as a shrink fit procedure, it is necessary to heat the frame 2 → insert the first stator 3, the shield plate 5, the second stator 4 → lower the temperature to room temperature. In this work, insert three parts at the same time. Therefore, quick work is required, that is, high skill and skill are required.

In the case of adhesion, the resolver needs to match the phase with the magnetic pole of the electric motor in order to detect an accurate signal, but since it is fixed to the frame 2 by adhesion, the phase with respect to the magnetic pole of the electric motor cannot be adjusted. I cannot detect the signal accurately.

Moreover, since the adhesive is applied to the outer peripheral surface of the insertion member for insertion, the adhesive dries if it is time-consuming to insert and is fixed during insertion, so quick work is required as with shrink fitting, Skill and skill are required.

It is an object of the present invention to provide a stator fixing method capable of overcoming the drawbacks of the conventional method and detecting a signal more accurately.

[Means for solving problems]

According to the present invention, the inner peripheral surface of the frame forming the outer cylinder and the outer peripheral surface of the stator are joined by fitting, and a pressing plate (spring) acting as an elastic body is provided between the end surface of the electric motor fixing portion and the second stator. ) Is inserted and the first and second stators are pressed in the axial direction of the motor shaft to fix the stators.

[Work]

Since it is a so-called clearance spring that presses the stator in the axial direction (thrust direction) by inserting a holding plate (leaf spring) that acts as an elastic body between the end surface of the electric motor fixing portion and the side surface of the second stator, No compressive stress acts on the first and second stators,
The stress does not affect the detection reliability, and the phase adjustment can be adjusted arbitrarily.

〔Example〕

FIG. 1 is a side view, partly in section, showing the structure of an embodiment of the present invention.

In all the drawings, the same symbols represent the same or corresponding parts.

This embodiment shows a composite resolver having two resolvers mounted on an electric motor, as compared to the conventional example.

On the rotor side of the resolver, both the first rotor 7 and the second rotor 8 are positioned in the thrust direction via the sleeve 9, the rings 16 and 17, and fixed to the motor shaft 10.

The stator side of the resolver is a cylindrical frame 2 with one end closed.
The first stator 3, the shield plate 5, and the second stator 4 are inserted into the inner peripheral surface (having a step (projection) on the side opposite to the electric motor side) to form a stator portion.

Then, the outer peripheral surfaces of the first stator 3 and the second stator 4 and the inner peripheral surface of the frame 2 are fitted with each other with a clearance of several μm.

When the frame 2 having the stator portion mounted in this manner is attached to the end face of the electric motor, between the end face of the electric motor and the side face of the stator,
While avoiding the detection coil 13, a leaf spring 60 having a U-shaped cross section in the radial direction is inserted, and the first and second stators are pressed together in the thrust direction via the shield plate 5 via the second stator 4. Meanwhile, the bolt 18 is screwed.

The leaf spring 60 is made of a magnetic material and also serves as a magnetic shield by the shield plate.

〔The invention's effect〕

Thus, according to the present invention, since the fixing means of the first and second stators are clearance springs, no compressive stress acts on the stator, and the mounting and dismounting of the stator is relatively easy, and the magnetic poles of the electric motor are It is also possible to adjust the phase for
Unlike the conventional bonding method, the assembly and disassembly do not require a high level of skill and skill to improve the reliability and workability by accurately detecting the signal.

[Brief description of drawings]

FIG. 1 is a side sectional view showing the structure of an embodiment of the present invention, and FIG. 2 is an explanatory view of a conventional example. 1 ... Electric motor, 2 ... Frame, 3 ... First stator (first resolver), 4 ... Second stator (second resolver), 5
...... Shield plate (T-shaped cross section), 6 Shield plate (donut-shaped disc), 7 ...... First rotor (first resolver),
8: second rotor (second resolver), 9: sleeve,
10 ... motor shaft, 11,13 ... detection coil,
12, 14 ... Leader wire, 15 ... Bearing, 16, 17 ...
Ring, 18 ... Bolt, 60 ... Holding plate.

Claims (4)

[Claims] 1. A method of fixing first and second rotors of a resolver to one end of a rotary shaft of a rotary body, and mounting the first and second stators of the resolver to a frame of the resolver through a gap therebetween. , A step is provided at one end of the inner peripheral surface of the cylindrical frame in the axial direction, and the outer peripheral surfaces of the first and second stators arranged side by side in the axial direction with the shield plate sandwiched between the outer peripheral portion of the first stator. Is inserted into the inner peripheral surface of the frame so as to come into contact with the step, and an elastic body is mounted between the resolver mounting side end surface of the electric motor and the second stator side surface of the resolver so that the first and second stators A method for fixing a resolver stator, characterized in that a frame is attached to an end face of an electric motor in a state in which a shield plate is axially pressed and the first and second stators and the shield plate are pressed against a step of the frame. 2. The resolver stator fixing method according to claim 1, wherein a leaf spring is mounted as the elastic body. 3. A second aspect of the present invention, wherein the leaf spring is made of a magnetic material.
The method for fixing the resolver stator according to the item. 4. The method of fixing a resolver stator according to claim 1, wherein the fit between the inner peripheral surface of the frame and the outer peripheral surface of the resolver stator is a clearance of several μm.