CN220649557U

CN220649557U - Novel encoder rotor structure of fixed shaft linear motor

Info

Publication number: CN220649557U
Application number: CN202322441913.4U
Authority: CN
Inventors: 王志勇
Original assignee: Tritex Corp
Current assignee: Tritex Corp
Priority date: 2023-09-08
Filing date: 2023-09-08
Publication date: 2024-03-22
Anticipated expiration: 2033-09-08

Abstract

The utility model provides a novel encoder rotor structure of a fixed shaft linear motor, which is characterized in that: the rear part of the bearing inner ring of the encoder bearing is a code wheel matching surface; the encoder rotor comprises an aluminum piece with an axial through hole, wherein magnetic steel is sleeved outside the aluminum piece, an axial through hole is formed in the aluminum piece, the rear part of the inner ring of the front bearing is inserted into and fixed at the front end of the through hole of the aluminum piece, and the front part of the inner ring of the encoder bearing is inserted into and fixed at the rear end of the through hole of the aluminum piece; the encoder PCB and the encoder housing are fixed on the encoder base; the inner hole of the encoder code disc is sleeved on the code disc matching surface of the encoder bearing and is in interference fit; the encoder PCB and the encoder code wheel are positioned in the encoder housing; the screw rod assembly penetrates through shaft holes of the front coil, the encoder rotor and the rear coil, and the external thread section of the screw rod assembly is matched with the internal thread of the axial through screw hole of the encoder rotor. The utility model realizes the integrated installation of the fixed shaft linear motor encoder.

Description

Novel encoder rotor structure of fixed shaft linear motor

Technical Field

The utility model belongs to the field of linear motors, and particularly relates to a novel encoder rotor structure of a fixed shaft linear motor.

Background

A linear motor. The device has stable quality, small volume, large thrust and wide market application, and various step sizes are selectable. However, due to the open-loop control characteristic of the stepping motor, for special application environments requiring closed-loop control, the client needs to add an additional electric signal feedback system, and the cost of the client product is increased.

Disclosure of Invention

The utility model provides a novel encoder rotor structure of a fixed shaft linear motor, which aims to solve the defects existing in the prior art and realize the integrated installation of the fixed shaft linear motor encoder.

The technical scheme adopted for solving the technical problems is as follows:

the novel encoder rotor structure of fixed shaft linear electric motor, its characterized in that:

the rear part of the bearing inner ring of the encoder bearing is a code wheel matching surface;

the encoder rotor comprises an aluminum piece with an axial through hole, wherein magnetic steel is sleeved outside the aluminum piece, an axial through hole is formed in the aluminum piece, the rear part of the inner ring of the front bearing is inserted into and fixed at the front end of the through hole of the aluminum piece, and the front part of the inner ring of the encoder bearing is inserted into and fixed at the rear end of the through hole of the aluminum piece;

the mounting plate is fixedly connected with the shell to form a motor shell;

the front coil is fixed on the mounting plate, and the front part of the front coil extends out of the mounting plate;

the rear coil is fixed in the shell, and the rear part of the rear coil extends out of the shell;

the middle polar plate is fixed between the front coil and the rear coil;

the front coil is sleeved on the outer ring of the front bearing, and the rear coil is sleeved on the outer ring of the encoder bearing;

the connector is fixed on the rear coil;

the encoder base is fixed on the connector;

the encoder PCB and the encoder housing are fixed on the encoder base;

the inner hole of the encoder code disc is sleeved on the code disc matching surface of the encoder bearing and is in interference fit;

the encoder PCB and the encoder code wheel are positioned in the encoder housing;

the screw rod assembly penetrates through shaft holes of the front coil, the encoder rotor and the rear coil, and the external thread section of the screw rod assembly is matched with the internal thread of the axial through screw hole of the encoder rotor.

The diameter of the portion of the inner race of the encoder bearing corresponding to the outer race of the bearing and the portion extending forward is larger than the portion of the inner race extending rearward.

And a plastic injection molding part is fixed in the aluminum part in an injection molding way, and the plastic injection molding part is provided with an axial through screw hole. The external thread section of the screw assembly is matched with the internal thread of the axial through screw hole of the plastic injection molding piece.

A wave pad is propped between the end face of the front bearing and the end face of the front coil.

The internal thread hole of the connector is matched with the external thread section of the rear coil in a threaded manner.

The screw passes through the through hole on the encoder base and then is screwed in the screw hole on the rear end face of the connector.

The utility model has the advantages that:

according to the utility model, through innovative design, the rolling bearing with a special structure is added, the small outer diameter cylindrical surface of the bearing is in interference fit with the inner hole of the encoder code disc, the encoder code disc and the rotor are ensured to synchronously rotate, and the closed-loop control function of the stepping motor is realized.

Drawings

The utility model will be further described with reference to the drawings and examples.

FIG. 1 is a cross-sectional view of the present utility model;

FIG. 2 is an exploded perspective view of the present utility model;

FIG. 3 is an exploded perspective view of another angle of the present utility model;

FIG. 4 is a cross-sectional view of an encoder rotor;

FIG. 5 is an exploded perspective view of the encoder rotor;

FIG. 6 is a perspective view of an encoder bearing;

FIG. 7 is a cross-sectional view of an encoder bearing.

Detailed Description

In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the description will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other embodiments may be obtained according to these drawings without inventive effort for a person skilled in the art. In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "upper," "lower," "inner," "outer," "bottom," and the like as used in this specification refer to an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be hooked up and operated in a particular orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 6 and 7:

the inner race of the encoder bearing 55 is cylindrical, and the outer surface of the rear portion thereof is a code wheel mating surface 551.

The diameters of the corresponding part and the forward extending part of the inner ring and the outer ring of the encoder bearing 55 are larger than those of the backward extending part of the inner ring, namely the code wheel matching surface 551 is a small-diameter cylindrical surface.

As shown in fig. 4 and 5:

the encoder rotor 5 comprises a cylindrical aluminum piece 52 with an axial through hole, the outer fixing sleeve of the aluminum piece 52 is provided with a magnetic steel 51, a plastic injection piece 53 is fixed in the aluminum piece 52 in an injection molding way, the plastic injection piece 53 is provided with an axial through screw hole, the rear part of the inner ring of the front bearing 54 is inserted into and fixed at the front end of the through hole of the aluminum piece 52, and the front part of the inner ring of the encoder bearing 55 is inserted into and fixed at the rear end of the through hole of the aluminum piece 52.

As shown in fig. 1, 2 and 3:

the mounting plate 1 and the shell 8 are fixedly connected to form a motor shell.

The front coil 2 is fixed on the mounting plate 1, and the front part of the front coil 2 extends out of the mounting plate 1.

The back coil 7 is fixed in the housing 8, and the back part of the back coil 7 extends out of the housing 8.

The middle pole plate 6 is fixed between the front coil 2 and the rear coil 7.

The front coil 2 is sleeved on the bearing outer ring of the front bearing 54, and a wave pad 3 is propped between the end face of the front bearing 54 and the end face of the front coil 2.

The back coil 7 is sleeved on the outer ring of the encoder bearing 55.

Thus, the encoder rotor 5 is installed in the motor housing.

The internal thread hole of the connector 9 is matched with the external thread section of the rear coil 7 in a threaded manner, and the connector 9 is fixed on the rear coil 7.

The screw 11 is inserted through the through hole of the encoder base 10 and then screwed into the screw hole of the rear end face of the connector 9, so that the encoder base 10 is fixed on the connector 9.

The encoder PCB board 12 is fixed to the encoder base 10.

Encoder housing 14 is secured to encoder base 10.

The inner bore of the encoder code wheel 13 is sleeved on the small outer diameter cylindrical surface of the bearing of the encoder bearing 55, namely the code wheel matching surface 551, and is in interference fit.

The encoder PCB 12 and the encoder code wheel 13 are located within an encoder housing 14.

The screw assembly 4 passes through the shaft holes of the front coil 2, the encoder rotor 5 and the rear coil 7, and the external thread section of the screw assembly 4 is matched with the internal thread of the axial through screw hole of the plastic injection molding piece 53 of the encoder rotor 5.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The novel encoder rotor structure of fixed shaft linear electric motor, its characterized in that: the rear part of the bearing inner ring of the encoder bearing is a code wheel matching surface; the encoder rotor comprises an aluminum piece with an axial through hole, wherein magnetic steel is sleeved outside the aluminum piece, an axial through hole is formed in the aluminum piece, the rear part of the inner ring of the front bearing is inserted into and fixed at the front end of the through hole of the aluminum piece, and the front part of the inner ring of the encoder bearing is inserted into and fixed at the rear end of the through hole of the aluminum piece; the mounting plate is fixedly connected with the shell to form a motor shell; the front coil is fixed on the mounting plate, and the front part of the front coil extends out of the mounting plate; the rear coil is fixed in the shell, and the rear part of the rear coil extends out of the shell; the middle polar plate is fixed between the front coil and the rear coil; the front coil is sleeved on the outer ring of the front bearing, and the rear coil is sleeved on the outer ring of the encoder bearing; the connector is fixed on the rear coil; the encoder base is fixed on the connector; the encoder PCB and the encoder housing are fixed on the encoder base; the inner hole of the encoder code disc is sleeved on the code disc matching surface of the encoder bearing and is in interference fit; the encoder PCB and the encoder code wheel are positioned in the encoder housing; the screw rod assembly penetrates through shaft holes of the front coil, the encoder rotor and the rear coil, and the external thread section of the screw rod assembly is matched with the internal thread of the axial through screw hole of the encoder rotor.

2. The fixed axis linear motor new encoder rotor structure of claim 1, wherein: the diameter of the portion of the inner race of the encoder bearing corresponding to the outer race of the bearing and the portion extending forward is larger than the portion of the inner race extending rearward.

3. The fixed axis linear motor new encoder rotor structure of claim 1, wherein: the plastic injection molding part is fixed in the aluminum part in an injection molding way and is provided with an axial through screw hole, and the external thread section of the screw rod assembly is matched with the internal thread of the axial through screw hole of the plastic injection molding part.

4. The fixed axis linear motor new encoder rotor structure of claim 1, wherein: a wave pad is propped between the end face of the front bearing and the end face of the front coil.

5. The fixed axis linear motor new encoder rotor structure of claim 1, wherein: the internal thread hole of the connector is matched with the external thread section of the rear coil in a threaded manner.

6. The fixed axis linear motor new encoder rotor structure of claim 1, wherein: the screw passes through the through hole on the encoder base and then is screwed in the screw hole on the rear end face of the connector.