A worm output type stepping motor

Abstract

The present invention discloses a worm output stepper motor, which includes a stepper motor body and a fixed mounting bracket. The stepper motor body includes a motor housing, a rotor assembly, and a stator assembly. The rotor assembly includes an output spindle, an intermediate plastic part, and a magnet that are injection molded into an integrated structure. The stator assembly includes a front frame, a rear frame, a front coil winding, and a rear coil winding. The front and rear frames are respectively provided with wiring terminals, and each wiring terminal passes through a through hole in the housing side wall of the motor housing and extends to the outer end side of the motor housing; a PCB board is installed on a PCB fixing frame, and plug-in terminals and wiring terminals are respectively welded on the PCB board; an output spindle is fitted with an output worm, and the output worm is riveted to the output spindle and the output worm is interference-fitted with the output spindle shaft hole. Through the above structural design, the present invention has the advantages of novel structural design, simple installation, good stability and reliability, and can be effectively applied to large load torque output.

Description

Technical Field

[0001] The present invention relates to the technical field of stepper motors, and in particular to a worm output type stepper motor. Background Art

[0002] Cameras are widely used in people's daily lives, and there are various camera products in the prior art, such as cameras used for security monitoring, cameras used for car driving recording, etc. For cameras, they are generally driven by stepper motors to achieve zooming and focusing actions.

[0003] It should be pointed out that for stepper motors used in automobiles, since the automobile is in a high-speed and high-vibration environment when it is running, this special use environment places higher requirements on the stepper motor, such as requiring stable electrical conductivity.

[0004] In addition, existing stepper motors for cameras generally have the defects of unreasonable design and inability to effectively apply to large load torque output. Summary of the invention

[0005] The object of the present invention is to provide a worm output type stepper motor to address the deficiencies of the prior art. The worm output type stepper motor has novel structural design, is easy to install, has good stability and reliability, and can be effectively applied to large load torque output.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions.

[0007] A worm output type stepper motor comprises a stepper motor body and a fixed mounting bracket located at the front end side of the stepper motor body, wherein the stepper motor body comprises a motor housing, and a rotor assembly and a stator assembly are embedded in the motor housing;

[0008] The rotor assembly includes an output spindle in the shape of a straight rod and a magnet in the shape of a circular ring. The rear end of the output spindle extends into the interior of the motor housing and the front end of the output spindle passes through the motor housing and extends to the front end side of the motor housing. The magnet is located inside the motor housing and is sleeved on the periphery of the output spindle. The magnet and the output spindle are coaxially arranged and an intermediate plastic part is arranged between the magnet and the output spindle. The output spindle, the magnet, and the intermediate plastic part are injection molded into an integrated structure.

[0009] The stator assembly includes a winding frame which is clamped and fixed inside the motor housing and sleeved on the periphery of the magnet, the winding frame includes a front-end frame and a rear-end frame located on the rear-end side of the front-end frame, the front-end frame is wound with a front-end coil winding, and the rear-end frame is wound with a rear-end coil winding; the front-end frame is provided with a terminal electrically connected to the front-end coil winding, and the rear-end frame is provided with a terminal electrically connected to the rear-end coil winding, the outer surface of the side wall of the motor housing is provided with a housing side wall through hole connected to the inside of the motor housing, and each terminal passes through the housing side wall through hole and extends to the outer end side of the motor housing; a PCB fixing frame aligned with the housing side wall through hole is installed on the outer side of the motor housing, the PCB fixing frame is provided with a PCB board, and each terminal is welded to the PCB board respectively; plug-in terminals are welded to the PCB board corresponding to each terminal, and each plug-in terminal is electrically connected to the corresponding terminal through the conductive circuit inside the PCB board;

[0010] The fixed mounting bracket includes a front side plate and a rear side plate of the bracket which are arranged vertically respectively. The front side plate of the bracket is located at the front end side of the rear side plate of the bracket. The front side plate of the bracket and the rear side plate of the bracket are opposite to each other front and back and are arranged at intervals. The motor housing is fixedly mounted on the rear surface of the rear side plate of the bracket. The front end of the output spindle extends between the front side plate of the bracket and the rear side plate of the bracket. An output worm gear sleeved on the periphery of the output spindle is installed between the front side plate of the bracket and the rear side plate of the bracket. The output worm gear is coaxially arranged with the output spindle, the output worm gear is riveted to the output spindle, and the output worm gear and the output spindle shaft hole are interference fit.

[0011] Among them, a rear end support plate is riveted to the rear surface of the motor housing, the front end of the output spindle is installed on the front side plate of the bracket through a front end ball bearing, the rear end of the output spindle passes through the motor housing and extends to the rear end side of the motor housing, and the rear end of the output spindle is installed on the rear end support plate through a rear end ball bearing.

[0012] Wherein, a flat anti-slip sleeve is sleeved on the periphery of the output main shaft at the rear end side of the output worm, and the flat anti-slip sleeve is riveted to the output main shaft;

[0013] The flat position anti-slip sleeve comprises a flat position anti-rotation part and an axial position limiting part arranged at the rear end of the flat position anti-rotation part, and the flat position anti-rotation part and the axial position limiting part are an integrated structure;

[0014] The rear end of the output worm is provided with a worm stop hole with a shape consistent with that of the flat stop part. The flat stop part of the flat anti-slip sleeve is inserted into the worm stop hole of the output worm, and the rear end face of the output worm abuts against the axial limiting part of the flat anti-slip sleeve.

[0015] Wherein, the fixed mounting bracket further includes a bracket middle plate located between the bracket front side plate and the bracket rear side plate, the front end of the bracket middle plate is connected to the bracket front side plate, and the rear end of the bracket middle plate is connected to the bracket rear side plate;

[0016] The middle plate of the bracket is provided with two fixing ear plates which are respectively perpendicular to the middle plate of the bracket, and each fixing ear plate is respectively provided with a screw mounting hole.

[0017] Wherein, the front side plate of the bracket, the rear side plate of the bracket, the middle plate of the bracket and each of the fixing ear plates are an integrated structure.

[0018] Wherein, the PCB fixing frame is buckled in the through hole of the side wall of the shell.

[0019] The beneficial effects of the present invention are as follows: the worm output type stepper motor described in the present invention comprises a stepper motor body and a fixed mounting bracket located at the front end side of the stepper motor body, the stepper motor body comprises a motor housing, a rotor assembly and a stator assembly are embedded inside the motor housing; the rotor assembly comprises an output spindle in the shape of a straight rod and a magnet in the shape of a circular ring, the rear end of the output spindle extends into the interior of the motor housing and the front end of the output spindle passes through the motor housing and extends to the front end side of the motor housing, the magnet is located inside the motor housing and the magnet is mounted on the output spindle. The output spindle is arranged on the periphery of the output spindle, the magnet is coaxially arranged with the output spindle and an intermediate plastic part is arranged between the magnet and the output spindle, and the output spindle, the magnet and the intermediate plastic part are injection molded into an integrated structure; the stator assembly includes a winding frame which is clamped and fixed inside the motor housing and sleeved on the periphery of the magnet, the winding frame includes a front-end frame and a rear-end frame located at the rear-end side of the front-end frame, the front-end frame is wound with a front-end coil winding, and the rear-end frame is wound with a rear-end coil winding; the front-end frame is provided with a wiring terminal electrically connected to the front-end coil winding, and the rear-end frame is provided with a wiring terminal electrically connected to the rear-end coil winding The motor housing is provided with a through hole on the side wall of the motor housing which is connected to the inside of the motor housing, and each terminal passes through the through hole on the side wall of the motor housing and extends to the outer end of the motor housing; a PCB fixing frame which is aligned with the through hole on the side wall of the motor housing is installed on the outside of the motor housing, and a PCB board is installed on the PCB fixing frame, and each terminal is welded to the PCB board respectively; plug-in terminals are welded to the PCB board corresponding to each terminal, and each plug-in terminal is electrically connected to the corresponding terminal through the conductive circuit inside the PCB board respectively; the fixing device The mounting bracket includes a bracket front side plate and a bracket rear side plate which are arranged vertically respectively, the bracket front side plate is located at the front end side of the bracket rear side plate, the bracket front side plate and the bracket rear side plate are opposite to each other and arranged at intervals, the motor housing is fixedly mounted on the rear surface of the bracket rear side plate, the front end of the output spindle extends between the bracket front side plate and the bracket rear side plate, an output worm gear sleeved on the periphery of the output spindle is installed between the bracket front side plate and the bracket rear side plate, the output worm gear is coaxially arranged with the output spindle, the output worm gear is riveted to the output spindle, and the output worm gear and the output spindle shaft hole are interference fit. Through the above structural design, the present invention has the advantages of novel structural design, simple installation, good stability and reliability, and can be effectively applied to large load torque output. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below with the aid of the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 It is a structural schematic diagram of another viewing angle of the present invention.

[0023] Figure 3 It is a schematic diagram of the decomposition of the present invention.

[0024] Figure 4 It is a cross-sectional schematic diagram of the present invention.

[0025] exist Figures 1 to 4 Included are:

[0026] 1——Stepper motor body 11——Motor housing

[0027] 111——through hole on the side wall of the housing 12——rotor assembly

[0028] 121——Output spindle 122——Magnet

[0029] 123——Intermediate plastic part 13——Stator assembly

[0030] 131——Front frame 132——Rear frame

[0031] 133 - Terminal block 2 - Fixed mounting bracket

[0032] 21——Front side plate of bracket 22——Rear side plate of bracket

[0033] 23——Bracket middle plate 24——Fixed ear plate

[0034] 241——Screw mounting hole 31——PCB fixing bracket

[0035] 32——PCB board 33——plug-in terminal

[0036] 4——Output worm 41——Worm stop hole

[0037] 5——Rear end support plate 61——Front end ball bearing

[0038] 62——Rear end ball bearing 7——Flat anti-slip sleeve

[0039] 71——flat position stopper 72——axial limiter. DETAILED DESCRIPTION

[0040] The present invention is described below in conjunction with specific implementation methods.

[0041] like Figures 1 to 4 As shown, a worm output stepper motor includes a stepper motor body 1 and a fixed mounting bracket 2 located at the front end side of the stepper motor body 1. The stepper motor body 1 includes a motor housing 11, and a rotor assembly 12 and a stator assembly 13 are embedded in the motor housing 11.

[0042] It should be explained that the rotor assembly 12 includes an output spindle 121 in the shape of a straight rod and a magnet 122 in the shape of a circular ring. The rear end of the output spindle 121 extends into the interior of the motor housing 11 and the front end of the output spindle 121 passes through the motor housing 11 and extends to the front end side of the motor housing 11. The magnet 122 is located inside the motor housing 11 and the magnet 122 is mounted on the outer periphery of the output spindle 121. The magnet 122 is coaxially arranged with the output spindle 121 and an intermediate plastic part 123 is provided between the magnet 122 and the output spindle 121. The output spindle 121, the magnet 122, and the intermediate plastic part 123 are injection molded into an integral structure.

[0043] Furthermore, the stator assembly 13 includes a winding frame that is clamped and fixed inside the motor housing 11 and is mounted on the periphery of the magnet 122. The winding frame includes a front frame 131 and a rear frame 132 located at the rear end side of the front frame 131. The front frame 131 is wound with a front coil winding, and the rear frame 132 is wound with a rear coil winding. The front frame 131 is provided with a terminal 133 electrically connected to the front coil winding, and the rear frame 132 is provided with a terminal 133 electrically connected to the rear coil winding. The outer surface of the side wall of the motor housing 11 is provided with a terminal 133 electrically connected to the motor outer wall. The motor housing 11 is connected to the through hole 111 on the side wall of the housing 11, and each terminal 133 passes through the through hole 111 on the side wall of the housing and extends to the outer end side of the motor housing 11; the outer side of the motor housing 11 is equipped with a PCB fixing frame 31 aligned with the through hole 111 on the side wall of the housing, and the PCB fixing frame 31 is equipped with a PCB board 32, and each terminal 133 is welded to the PCB board 32; the PCB board 32 is welded with a plug-in terminal 33 corresponding to each terminal 133, and each plug-in terminal 33 is electrically connected to the corresponding terminal 133 through the conductive circuit inside the PCB board 32. Preferably, the PCB fixing frame 31 is buckled into the through hole 111 on the side wall of the housing; of course, the above-mentioned assembly method of the PCB fixing frame 31 does not constitute a limitation to the present invention, that is, the PCB fixing frame 31 of the present invention can also be assembled to the motor housing 11 in other ways, such as screw connection.

[0044] Furthermore, the fixed mounting bracket 2 includes a bracket front side plate 21 and a bracket rear side plate 22 which are arranged vertically respectively. The bracket front side plate 21 is located at the front end side of the bracket rear side plate 22. The bracket front side plate 21 and the bracket rear side plate 22 are opposite to each other front and back and arranged at intervals. The motor housing 11 is fixedly mounted on the rear surface of the bracket rear side plate 22. The front end portion of the output spindle 121 extends between the bracket front side plate 21 and the bracket rear side plate 22. An output worm 4 is installed between the bracket front side plate 21 and the bracket rear side plate 22 and is sleeved on the outer periphery of the output spindle 121. The output worm 4 is coaxially arranged with the output spindle 121, and the output worm 4 is riveted to the output spindle 121 and the output worm 4 has an interference fit with the axial hole of the output spindle 121.

[0045] It should be further pointed out that if Figures 1 to 4 As shown, the fixed mounting bracket 2 also includes a bracket middle plate 23 located between the bracket front side plate 21 and the bracket rear side plate 22, the front end of the bracket middle plate 23 is connected to the bracket front side plate 21, and the rear end of the bracket middle plate 23 is connected to the bracket rear side plate 22; the bracket middle plate 23 is provided with two fixing ear plates 24 respectively perpendicular to the bracket middle plate 23, and each fixing ear plate 24 is respectively provided with a screw mounting hole 241. Among them, the bracket front side plate 21, the bracket rear side plate 22, the bracket middle plate 23 and each fixing ear plate 24 are an integrated structure.

[0046] During the working process of the present invention, the front-end coil winding and the rear-end coil winding generate magnetic force after being energized, and the magnetic force acts on the magnet 122. Since the magnet 122, the intermediate plastic part 123, and the output main shaft 121 are injection-molded into an integrated structure, the magnet 122 drives the intermediate plastic part 123 and the conveying main shaft to rotate synchronously, and the rotating output main shaft 121 drives the output worm 4 to rotate synchronously; the output worm 4 of the present invention is meshed with the worm wheel of the opponent mechanism, and the driving structure in which the output worm 4 is meshed with the worm wheel has the advantages of relatively stable pitch circle meshing, small return clearance, and low transmission noise during transmission when driving the opponent mechanism, and can be well suitable for large load torque output.

[0047] It should be emphasized that, for the rotor assembly 12 of the present invention, the magnet 122, the intermediate plastic part 123, and the output spindle 121 are injection molded into an integral structure. During the injection molding, the magnet 122 and the output spindle 121 are installed in the injection mold. When the intermediate plastic part 123 is injection molded by the injection mold, the magnet 122, the intermediate plastic part 123, and the output spindle 121 are combined into one. Compared with the traditional structure of installing the magnet 122 through an aluminum retainer, the rotor assembly 12 of the present invention has the advantages of light weight and low inertia when rotating at high speed, and there will be no loss of step when the stepping motor is running at high frequency, that is, the present invention is suitable for high-frequency torque output.

[0048] In addition, the stepper motor output structure of the present invention adopts a pin-type structure design, that is, each wiring terminal 133 and each plug-in terminal 33 are respectively welded to the PCB board 32, and each plug-in terminal 33 is electrically connected to the corresponding wiring terminal 133 through the conductive circuit inside the PCB board 32. Compared with the traditional stepper motor in which the wiring terminal 133 is directly connected to the wire, the present invention has better conduction stability and safety, and can be used in a high-frequency vibration environment and tightly matched with the socket, especially in a high-speed and high-vibration environment of a car, it can operate safely without looseness or poor contact, and the pin-type structure improves the welding strength, that is, it can effectively fix the risk of a single PIN foot being stressed.

[0049] In summary, it can be seen that, through the above structural design, the present invention has the advantages of novel structural design, simple installation, good stability and reliability, and can be effectively applied to large load torque output.

[0050] As a preferred embodiment, Figures 1 to 4 As shown, the rear surface of the motor housing 11 is riveted with a rear end support plate 5, the front end of the output spindle 121 is mounted on the front side plate 21 of the bracket through a front end ball bearing 61, the rear end of the output spindle 121 passes through the motor housing 11 and extends to the rear end side of the motor housing 11, and the rear end of the output spindle 121 is mounted on the rear end support plate 5 through a rear end ball bearing 62. For the output spindle 121 supported by the ball bearing, it has high operating efficiency, low resistance, and low noise in long-term operation.

[0051] As a preferred embodiment, Figure 3 and Figure 4 As shown, the outer periphery of the output main shaft 121 is sleeved with a flat anti-skid sleeve 7 on the rear end side of the output worm 4, and the flat anti-skid sleeve 7 is riveted to the output main shaft 121; the flat anti-skid sleeve 7 includes a flat stop portion 71 and an axial limiting portion 72 arranged at the rear end of the flat stop portion 71, and the flat stop portion 71 and the axial limiting portion 72 are an integral structure; the rear end portion of the output worm 4 is provided with a worm stop hole 41 whose shape is consistent with the shape of the flat stop portion 71, the flat stop portion 71 of the flat anti-skid sleeve 7 is inserted into the worm stop hole 41 of the output worm 4, and the rear end face of the output worm 4 abuts against the axial limiting portion 72 of the flat anti-skid sleeve 7.

[0052] The flat anti-skid sleeve 7 of the present invention can play an auxiliary fixing and protecting role for the output worm 4; by the flat anti-skid sleeve 7, the flat anti-rotation portion 71 cooperates with the worm anti-rotation hole 41 of the output worm 4, when the output worm 4 is subjected to a large load force, the flat anti-rotation portion 71 of the flat anti-skid sleeve 7 can perform anti-rotation protection on the output worm 4, so as to avoid the output worm 4 slipping and loosening when subjected to a large load force. The rear end face of the output worm 4 is limited by the axial limiting portion 72 of the flat anti-skid sleeve 7, and when the output worm 4 is subjected to a large load force, the present invention can perform axial protection on the output worm 4. Therefore, by adding the flat anti-skid sleeve 7 structural design, the present invention is more effectively applicable to large load torque output.

[0053] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A worm output type stepper motor, comprising a stepper motor body (1), and a fixed mounting bracket (2) located at the front end side of the stepper motor body (1), the stepper motor body (1) comprising a motor housing (11), and a rotor assembly (12) and a stator assembly (13) are embedded inside the motor housing (11); Features: The rotor assembly (12) comprises an output main shaft (121) in the shape of a straight rod and a magnet (122) in the shape of a circular ring. The rear end of the output main shaft (121) extends into the interior of the motor housing (11) and the front end of the output main shaft (121) passes through the motor housing (11) and extends to the front end side of the motor housing (11). The magnet (122) is located inside the motor housing (11) and is sleeved on the periphery of the output main shaft (121). The magnet (122) and the output main shaft (121) are coaxially arranged and an intermediate plastic part (123) is provided between the magnet (122) and the output main shaft (121). The output main shaft (121), the magnet (122) and the intermediate plastic part (123) are injection molded into an integrated structure. The stator assembly (13) includes a winding frame that is clamped and fixed inside the motor housing (11) and is mounted on the periphery of the magnet (122), the winding frame including a front frame (131) and a rear frame (132) located at the rear end side of the front frame (131), the front frame (131) is wound with a front coil winding, and the rear frame (132) is wound with a rear coil winding; the front frame (131) is provided with a connection terminal (133) electrically connected to the front coil winding, and the rear frame (132) is provided with a connection terminal (133) electrically connected to the rear coil winding, and the outer surface of the side wall of the motor housing (11) is provided with a connection terminal (133) electrically connected to the inside of the motor housing (11) The motor housing (11) is connected to the motor housing (11) through holes (111) in the side walls of the housing, and each of the connection terminals (133) passes through the side holes (111) of the housing and extends to the outer end side of the motor housing (11); a PCB fixing frame (31) aligned with the side holes (111) of the housing is installed on the outer side of the motor housing (11); a PCB board (32) is installed on the PCB fixing frame (31), and each of the connection terminals (133) is welded to the PCB board (32); a plug-in terminal (33) is welded to the PCB board (32) corresponding to each of the connection terminals (133), and each of the plug-in terminals (33) is electrically connected to the corresponding connection terminal (133) through a conductive circuit inside the PCB board (32); The fixed mounting bracket (2) comprises a bracket front side plate (21) and a bracket rear side plate (22) which are arranged vertically, respectively. The bracket front side plate (21) is located at the front end side of the bracket rear side plate (22). The bracket front side plate (21) and the bracket rear side plate (22) are opposite to each other and arranged at intervals. The motor housing (11) is fixedly mounted on the rear surface of the bracket rear side plate (22). The front end of the output spindle (121) extends between the bracket front side plate (21) and the bracket rear side plate (22). An output worm (4) sleeved on the outer periphery of the output spindle (121) is installed between the bracket front side plate (21) and the bracket rear side plate (22). The output worm (4) and the output spindle (121) are arranged coaxially. The output worm (4) is riveted to the output spindle (121) and the output worm (4) and the shaft hole of the output spindle (121) are interference fit. The output main shaft (121) is provided with a flat anti-skid sleeve (7) on the rear end side of the output worm (4), and the flat anti-skid sleeve (7) is riveted to the output main shaft (121); the flat anti-skid sleeve (7) comprises a flat anti-rotation portion (71) and an axial limiting portion (72) arranged at the rear end of the flat anti-rotation portion (71), and the flat anti-rotation portion (71) and the axial limiting portion (72) are an integral structure; the rear end portion of the output worm (4) is provided with a worm anti-rotation hole (41) having a shape consistent with that of the flat anti-rotation portion (71), the flat anti-rotation portion (71) of the flat anti-skid sleeve (7) is inserted into the worm anti-rotation hole (41) of the output worm (4), and the rear end surface of the output worm (4) abuts against the axial limiting portion (72) of the flat anti-skid sleeve (7); A rear end support plate (5) is riveted onto the rear surface of the motor housing (11); a front end portion of the output spindle (121) is mounted on the front side plate (21) of the bracket via a front end ball bearing (61); a rear end portion of the output spindle (121) passes through the motor housing (11) and extends to the rear end side of the motor housing (11); and a rear end portion of the output spindle (121) is mounted on the rear end support plate (5) via a rear end ball bearing (62); The PCB fixing frame (31) is buckled into the through hole (111) of the housing side wall.

2. A worm output type stepping motor according to claim 1, characterized in that: The fixed mounting bracket (2) further comprises a bracket middle plate (23) located between the bracket front side plate (21) and the bracket rear side plate (22), the front end of the bracket middle plate (23) being connected to the bracket front side plate (21), and the rear end of the bracket middle plate (23) being connected to the bracket rear side plate (22); The bracket middle plate (23) is provided with two fixing ear plates (24) respectively perpendicular to the bracket middle plate (23), and each fixing ear plate (24) is provided with a screw mounting hole (241).

3. A worm output type stepping motor according to claim 2, characterized in that: The bracket front side plate (21), the bracket rear side plate (22), the bracket middle plate (23) and each of the fixing ear plates (24) are an integrated structure.

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