Motor

Abstract

To provide a motor that improves workability and handling of a winding and a circuit connection.SOLUTION: The motor includes: a rotor unit 20 having a rotor magnet 2; and a stator unit 23 having: a winding coil unit 21 that drives the rotor magnet 20; a control circuit board 24 that controls energization to the winding coil unit 21; and a terminal pin 5 to which an end of the winding 6 of the winding coil unit 21 is tied and which is electrically connected to the control circuit board 24. The stator unit 23 has a base plate 9 to which the control circuit board 24 is mounted, and the base plate 9 has a through-hole 9x through which the terminal pin 5 is inserted.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a motor capable of highly accurate angle control, and more particularly to a method for connecting the windings and circuit boards thereof. [Background technology]

[0002] Conventionally, a method for connecting motor windings to a circuit board has been to electrically connect the winding coil to the outer surface of an electronic circuit board disposed on the underside of the stator, as in Patent Document 1, for example. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-87371 Summary of the Invention [Problem to be solved by the invention]

[0004] To electrically connect the electronic circuit board and the windings as in Patent Document 1, it was necessary to wire the winding ends or wires (lead wires), etc. In particular, the work of connecting thin lead wires and winding ends to the electronic circuit board required manual correction work, which increased the number of work steps. [Means for solving the problem]

[0005] In order to solve the above problems, the motor according to the present invention comprises: a rotor unit having a rotor magnet; a stator unit having a winding coil unit that drives the rotor magnet, a control circuit board that controls the supply of current to the winding coil unit, and terminal pins to which ends of the windings of the winding coil unit are wound and which are electrically connected to the control circuit board; Equipped with the stator unit has a base plate to which the control circuit board is attached, The base plate has through holes through which the terminal pins are inserted. [Effects of the Invention]

[0006] According to the present invention, the winding unit can be easily assembled and electrically connected by soldering. [Brief explanation of the drawings]

[0007] [Figure 1] High-precision angle control motor exploded perspective view [Figure 2] Winding diagram with terminal pins [Figure 3] Exploded view of winding and base plate with terminal pins [Figure 4] Motor cross section [Figure 5] 1 is a top view of a main part for comparing the arrangement of terminal pins relative to the core of the prior art and the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] [First embodiment] 1 and 2 are explanatory diagrams showing the structure of a DC brushless motor to which the present invention is applied. As shown in Fig. 1, the motor of this embodiment is composed of a rotor unit 20 consisting of a hollow shaft 7, a rotor case 1, and a rotor magnet 2; a stator unit 23 consisting of a winding coil unit 21, a base plate 9, a housing 8, and bearings 14a and 14b; and an encoder section 22 consisting of a control circuit board 24 including a sensor magnet 11, a sensor board 12, and an encoder IC 13 mounted thereon. The control circuit board 24 is attached to the stator unit 23 by fixing the sensor board 12 to the base plate 9. While adhesive or other methods can be used for fixing, in this embodiment, soldering of terminal pins 5 is used as an additional fixation, as will be described later, making it easy to hold the stator unit 23 in place by adhesive.

[0009] The rotor unit 20 includes a rotor case 1 fastened to the hollow shaft 7 by welding or caulking, etc., and a rotor magnet 2 inside the rotor case 1, with a screw hole (not shown) on the top surface of the rotor case 1 for attachment to the load side. The rotor magnet 2 is driven by a magnetic field generated by passing current through the windings 6 of the winding coil unit 21, causing the motor to rotate. In this embodiment, the rotor magnet 2 is a neodymium magnet, and the hollow shaft 7 is made of non-magnetic stainless steel, but these are just examples.

[0010] The rotor unit 20 is mounted on a stator unit 23, and its outer ring is held by the inner rings of two bearings 14a and 14b fixed to the stator unit 23, increasing its rigidity in the axial and radial directions.

[0011] FIG. 2 shows a perspective view of the winding coil unit 21. FIG. 2(a) shows a perspective view from the rotor unit 20 side, and FIG. 2(b) shows a perspective view from the stator unit 23 side. The winding coil unit 21 is composed of laminated cores 3a to 3n, which are laminated using a stack or the like, insulators 4a and 4b, three terminal pins 5a to 5c, and windings 6 wound around the salient poles of each laminated core. In the following explanation, these may be referred to as the laminated core 3, insulator 4, and terminal pin 5, respectively, when described collectively. The insulator 4 is molded from resin or the like and is provided to cover both ends of the laminated core 3 in the axial direction of the motor to insulate the laminated core 3 from the windings 6 and to hold the terminal pins 5. As will be described later, the insulator 4 ensures insulation between the laminated core 3 and the terminal pins 5, which are wound with the windings 6 on the rotor unit 20 side and extend toward the stator unit 23 side, and the laminated core 3.

[0012] The terminal pins 5 serve to hold the beginning and end of the winding 6, and the end opposite the end holding the winding 6 is connected to the control circuit board 24 through the base plate 9. As shown in FIG. 3, the base plate 9 is provided with U-shaped holes 9a-9c (hereinafter collectively referred to as U-shaped holes 9x), which are examples of through holes through which the terminal pins 5 are inserted. The terminal pins 5 pass through these U-shaped holes 9x and are electrically connected to the control circuit board 24 by soldering or the like, as shown in FIG. 4. The U-shaped holes 9x in the base plate 9 have a clearance approximately three times larger than the terminal pins 5, preventing contact and insulating them from each other. This allows assembly without insulating the terminal pins 5, thereby reducing costs. Note that, since the provision of the terminal pins 5 has the effect of preventing the winding 6 from coming apart during assembly, the terminal pins 5 may actually be insulated.

[0013] Furthermore, the winding and terminal processing can be performed using a fully automatic winding machine, which significantly reduces the number of manufacturing steps.

[0014] The terminal pins 5 are positioned between the salient poles (slots) of the laminated core 3. However, for reasons such as ensuring a winding path, they are typically positioned at a certain distance radially inward from the slots, e.g., closer to the inner diameter of the core. Figure 5 is a top view of the core of the present embodiment, comparing the terminal pin arrangements for the cores of the prior art and this embodiment. As shown in Figure 5(a), conventional terminal pins are positioned within notches (on the inner diameter side of the core) on the inner diameter edge (inner edge) of the core. However, in the motor of this embodiment, as shown in Figure 5(b), the terminal pins 5 are positioned within notches 3a (on the outer diameter side of the laminated core 3) between the salient poles of the laminated core 3, on the outer diameter edge (outer edge) of the core. This allows for a larger core inner diameter, which in turn allows for larger diameters for the housing 8 and bearings, improving the axial rigidity of the motor. Figure 5(b) also shows how the base plate 9, described in Figure 3, avoids the terminal pins 5 by using the U-shaped holes 9x, allowing the terminal pins 5 to reach the sensor board 12.

[0015] By arranging the terminal pin 5 on the outer diameter side in this way, it is possible to arrange the bearings 14a, 14b and the sensor magnet 11 side by side in the axial direction along the hollow shaft 7, as shown in the cross-sectional view of Figure 4. In other words, it is possible to arrange the sensor magnet 11 further on the inner diameter side while saving space, and it is possible to reduce the inertia generated by the sensor magnet 11 when the rotor unit 20 rotates.

[0016] 5(b) shows a state in which the insulator 4 has been removed for the sake of explanation, but in reality, as shown in Fig. 5(c), the insulator 4 that holds the terminal pin 5 described above is attached to the laminated core 3 of Fig. 5(b). A winding 6 is wound around this integrated laminated core 3 and insulator 4, and the end of the winding 6 is tied to the terminal pin 5.

[0017] Furthermore, the terminal pins 5 are square pins, and by driving them so that their faces are perpendicular to the radial direction of the laminated core 3, they can be pulled and cut off using the corner edges in an automatic winding machine, improving production efficiency. In addition, in this embodiment, an arc-shaped portion 4a is formed on the outer diameter side of the terminal pin 5 of the insulator 4. The arc-shaped portion 4a can reduce the impact on the winding 6 even if the winding 6 comes into contact with the insulator 4 when winding the winding 6 around the terminal pin 5 using an automatic winding machine. This allows the terminal pin 5 to be positioned further outward, thereby reducing the size of the notch in the laminated core 3 and ensuring the rigidity of the laminated core 3. Note that the arc-shaped portion 4a may not be formed if the rigidity of the laminated core 3 can be ensured without the terminal pin 5 protruding outward from the insulator 4.

[0018] As described above, the sensor magnet 11 is adhesively fixed to the hollow shaft 7 of the rotor unit 20 for the encoder IC 13 of the control circuit board 24 arranged on the back side of the base plate 9 in FIG.

[0019] The base plate 9 not only serves to fix the housing 8 and the control circuit board 24, but also serves to shield the encoder IC 13 from electromagnetic noise emitted from the winding coil unit 21. As an example, it is made of a metal such as iron, but any material can be used as long as it can block electromagnetic noise.

[0020] When the rotor unit 20 rotates, the sensor magnet 11 rotates together with the rotor unit 20 because it is attached to the hollow shaft 7. The sensor magnet 11 is magnetized with two poles, and the rotation angle is recognized by detecting magnetic changes with the encoder IC 13. Note that the sensor magnet may have more than two poles.

[0021] The stator unit 23 consists of a winding coil unit 21, a base plate 9, and a housing 8 that holds bearings 14a and 14b. The base plate and the housing are joined by welding, but mechanical joining means such as caulking or shaft press-fitting may also be used.

[0022] By passing current through the windings 6 of the DC brushless motor configured as described above, a rotating magnetic field is generated, and as a result, the rotor magnet 2 receives a rotational force, causing the rotor unit 20 to rotate relative to the stator unit 23 via the bearings 14a and 14b. [Explanation of symbols]

[0023] 1 rotor case 2 rotor magnet 3a~n laminated core 4a, b Insulator 5a~c Terminal pins 6 windings 7 hollow shaft 8. Housing 9 Base Plate 9a~c Terminal pin relief holes (U-shaped holes 9x) 10 spacer 11 Sensor magnet 12 Sensor board 13 Angle Sensor 14a, b bearings

Claims

1. a rotor unit having a rotor magnet; a stator unit having a winding coil unit that drives the rotor magnet, a control circuit board that controls the supply of current to the winding coil unit, and terminal pins to which ends of the windings of the winding coil unit are wound and which are electrically connected to the control circuit board; Equipped with the stator unit has a base plate to which the control circuit board is attached, The motor is characterized in that the base plate has through holes through which the terminal pins are inserted.

2. 2. The motor according to claim 1, wherein the base plate of the stator unit is made of metal and blocks electromagnetic noise emitted from the winding coil unit.

3. The stator unit includes a core, salient poles provided on the core and around which the windings are wound, and insulators that insulate the core from the windings, 2. The motor according to claim 1, wherein the terminal pin is held by the insulator.

4. 4. The motor according to claim 3, wherein the terminal pin is disposed between the salient poles of the core and in a notch provided on the outer edge of the core in the radial direction.

5. 5. The motor according to claim 3, further comprising an arc-shaped portion projecting from a portion of the insulator that holds the terminal pin toward an outer edge thereof.

6. the rotor unit is attached to the stator unit via a bearing, 6. The motor according to claim 5, wherein the rotor unit is fixed to an inner ring of the bearing, and the stator unit is fixed to an outer ring of the bearing.

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