motor

Abstract

To provide a motor which reduces a material cost by integrating different functions in an end shield, and also reduces a conveyance cost and an assembling cost in manufacturing.SOLUTION: The present invention relates to a motor 1 including a sensor structure. The sensor structure includes a detection unit 3, and a contact unit 4, and both are arranged in an end shield 2 of the motor. The detection unit is attached to a first assembling surface of the end shield, and the contact unit is attached to a second assembling surface of the end shield.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a motor. [Background technology]

[0002] Patent document 1 discloses an electronically commutated electric motor having a stator with at least one stator winding, a rotor with magnetized regions, and a sensor member in the stator for detecting the position of the magnetized regions. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] German Patent Application Publication No. 3914082A1 Summary of the Invention

[0004] The motor according to the present invention includes a sensor structure having a sensing unit and a contact unit, both of which are disposed on an end shield of the motor, with the sensing unit attached to a first mounting surface of the end shield and the contact unit attached to a second mounting surface of the end shield.

[0005] This has the advantage that the end shields, which are provided to support the motor rotor shaft, can take on additional functions that are useful in the limited design space of electric motors. In this way, the end shields can not only support the rotor, but also serve as assembly aids for the contacting and sensing units. Integrating different functions into the end shields reduces material costs, as well as transport and assembly costs during manufacturing.

[0006] In a preferred embodiment of the motor, the first mounting surface is in a first plane of the end shield, and the second mounting surface is in a second plane that is different from the first plane. By providing the mounting surfaces in different planes, the contacting or sensing unit mounted thereon can be guided to the correct location within the design space of the motor and remain correctly positioned there.

[0007] Furthermore, the motor may include a stator and a rotor, and may be configured such that the detection unit and the contact unit face the interior space of the motor when the end shield is assembled to the motor. In particular, the contact unit may face the stator, and the detection unit may face the rotor. This again allows optimal use of the existing space in the electric motor and ensures accurate positioning of the contact unit and the detection unit within the motor space.

[0008] In one embodiment of the motor, the sensing unit is electrically connected to the contacting unit by a cable. In particular, this connection may be made by a flat ribbon cable that runs radially along the contour of the end shield. This electrical connection allows for compensation of offsets between the sensing unit and the contacting unit that arise due to the different positioning required within the motor space.

[0009] In motor embodiments, the active sensor components are mounted on the sensing or contacting unit, particularly on the rear side of the sensing unit facing the end shield, allowing otherwise external electronics to remain integrated into one compact component, reducing the degree of independence from external control devices or the need for other electronic support components.

[0010] Furthermore, the contact unit is preferably provided with terminals for contacting the stator coils, control device terminals and connections to the detection unit, which allows for easy connection and contacting of electronic components throughout the motor space.

[0011] In another embodiment of the motor, the detection unit annularly surrounds the axial opening of the end shield, in which the upper ball bearing is held. The ball bearing may then be arranged in a plane different from the second plane, particularly at least to a certain extent. Positioning the detection unit around the ball bearing of the rotor, or more precisely of the rotor shaft, has the advantage of space-saving positioning within the motor space.

[0012] It is further preferred that the contact unit can annularly surround the axial opening of the end shield, in which the upper ball bearing is held. If both units, i.e. the sensing unit and the contact unit, surround the axial opening of the end shield, then, if properly dimensioned, the contact unit and the sensing unit can be manufactured separately from one common part, thereby reducing punching waste material.

[0013] In an embodiment of the motor, the contact unit annularly surrounds the axial opening of the end shield such that the axial opening (5) is in a plane different from the second plane.

[0014] In another embodiment, the contact unit is in the form of a plate and is attached to the end shield opening at the second plane of the end shield, so that the contact unit surrounds the axial opening of the end shield in proportion to the shape of the opening.

[0015] The detection unit can be attached to the end shield via a support part, which allows, for example, easier assembly and, if necessary, electrical insulation between the end shield and the detection unit. Furthermore, the support part also allows for an adapted positioning of the detection unit relative to the rotor of the motor.

[0016] In a preferred embodiment of the motor, the plastic end shields are filled with a material, ideally glass fiber, for example, to improve their mechanical properties, which ensures mutual insulation of the conductive materials and allows for greater design freedom in the configuration of the end shields.

[0017] Next, an embodiment of the present invention will be described with reference to the drawings. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. [Figure 2] FIG. 2 is a view showing an end shield of the motor. [Figure 3] FIG. 3 is a cross-sectional view showing an end shield. [Figure 4] FIG. 10 shows an end shield having a sensor substrate on a support component. [Figure 5] 10A and 10B are diagrams illustrating modified examples of the support component. [Figure 6] 10A and 10B are diagrams illustrating modified examples of the support component. DETAILED DESCRIPTION OF THE INVENTION

[0019] FIG. 1 shows a cross-sectional view of a drive motor 1. A rotor 12 is connected to a shaft 10 supported by bearings 13 and 14. The lower bearing 13 is housed in a recess in a housing 15 of the drive motor 1. The upper bearing 14 is housed in a recess 5 in an end shield 2 of the drive motor 1. The shaft 10 is rotatable about its longitudinal axis 10 within the bearings 13 and 14. A stator 16 surrounds the rotor 12, enabling it to rotate. The stator may be composed of, for example, stacked electrical steel plates as a stator package. Additionally, the stator may have individual windings, or coils, the number of which corresponds to the designed stator topology, made of, for example, copper wire. The stator may further have an insulator for insulating the coils from the stator package and a circuit board with the insulator. The circuit board electrically connects the individual windings to each other, establishing the corresponding three-phase current (busbars) to three different contacts.

[0020] The rotor surrounds the shaft 10 and consists of, for example, laminated and pressed electric iron sheets (rotor package) 12 and magnets (for example, rare earth magnets) assembled in the rotor package, the number of which corresponds to the designed rotor topology. The rotor is fixed axially so that it can rotate on bearings 13 arranged on both sides of the shaft.

[0021] A target 7 is coupled to the shaft 10 and / or rotor 12 so as to rotate together with the rotor 12 and / or shaft 10. The movement of the target 7 can be measured by a suitable sensor 3. In this way, the target 7 can be used by the sensor 3 to determine the position and / or the rotation speed of the rotor 12. The determination of the position and / or the rotation speed of the rotor 12 can be used to control the motor 1.

[0022] The sensor 3 is held parallel to the target 7, so that the sensitive sensor surface of the sensor 3 faces the target 7. The measurement principle can be an inductive one. The sensor 3 includes at least one excitation coil and at least one detection coil. Both the excitation coil and the detection coil are integrated into the sensor substrate 3. The target 7 includes conductive and non-conductive areas. Furthermore, the sensor 3, or more precisely the sensor substrate 3, includes active and passive sensor components, such as a sensor ASIC mounted on the back side of the sensor substrate 3.

[0023] As the target 7 rotates, conductive areas of the target 7 alternate with non-conductive areas of the target 7 and pass over the sensitive surface of the sensor 3. This induces a varying voltage in the sensing coil, which characterizes the rotational motion as a signal from which the position or rotational speed of the rotor 12 relative to the stator 16 can be determined.

[0024] The stator 16 includes contact terminals 9 that are attached to the coils of the stator 16 and allow them to be loaded with a current / voltage, thus inducing movement of the rotor 12 when the motor is controlled. The contact terminals 9 are connected to a stator board 4, which can also be connected to a motor controller, in particular via a controller interface 6.

[0025] The stator board 4 and the sensor board 3 are connected to each other via an electrical connection 8, for example via a flat ribbon cable.

[0026] Via the electrical connection 8, e.g., via a flexible conductor, the sensor electronics are provided with a supply voltage and a supply current, as well as an output signal to a subsequent evaluation unit (e.g., an ECU). This output signal can be analog or digital, depending on the ASIC implementation used. The stator substrate 4 and the sensor substrate 3 are arranged on different planes. The sensor substrate 3 is located closer to the rotor 12 than the stator substrate 4. The sensor substrate 3 is also located closer to the shaft 10 than the stator substrate 4. In FIG. 1, both the stator substrate 4 and the sensor substrate 3 are attached to the end shield 2, which also holds the upper bearing 14. If the end shield 2 is made of plastic, the stator substrate 4 and the sensor substrate 3 can be attached directly to the end shield. If a metal end shield 2 is provided, the attachment can be via an insulating plate or disk, which prevents electrical contact between the electrical components on the respective substrates and the end shield 2.

[0027] 2 shows the end shield 2 in isolation in a perspective view. Two planes are visible in which the stator substrate 4 and sensor substrate 3 are arranged on the end shield 2. Both the stator substrate 4 and the sensor substrate 3 annularly surround a central opening 5 that can accommodate an upper ball bearing 14. The stator substrate 4 also has contact points for connecting the coils of the stator 16 to the contact terminals 9. The contact points are not shown in Figure 2 but may be designed, for example, as soldered contact pads for establishing an electrical connection by means of contact springs. Other contact types are also conceivable.

[0028] 3 also shows the end shield 2 with the attached sensor board 3 and stator board 4, and—as mentioned above—the electrical connection cables 8 extending between the sensor board 3 and the stator board 4 for transmitting the current supply and the sensor signals. The connection cables 8 extend in the radial direction r along the contour of the end shield 2. As can be seen in FIG. 3, the stator board 4 is received in a corresponding receiving recess in the end shield 2.

[0029] In one embodiment, as shown in Figure 4, the end shield 2 includes a sensor board 3 attached to the end shield 2 by a mounting part 11. This embodiment has a terminal board 4 for the sensor 3 instead of the stator board 4, which has an active sensor element, for example a sensor Asic. The stator wiring is routed through a separate part (not shown) in this example.

[0030] FIG. 5 shows a variant of the support part 11 which receives the sensor substrate 3, for example via a snap joint.

[0031] In both FIG. 4 and FIG. 5, the sensor board 3 and the terminal board 4 are connected to an electrical connection cable 8.

[0032] FIG. 6 shows another embodiment of the support part 11 in which the sensor board 3 is held on the support part 11 by four mounting parts 15 . [Explanation of symbols]

[0033] 1 motor 2 End Shields 3 Detection unit 4 Contact Unit 5 Axial opening 6 Control Device Terminals 8 Cable 12 rotors 14 ball bearings 16 Stator

Claims

1. In a motor (1) including a sensor structure (3, 4), the sensor structure comprises: a detection unit (3); a contact unit (4), Both of these are arranged on the end shield (2) of the motor (1), The detection unit (3) is disposed on a first mounting surface of the end shield (2), The contact unit (4) is disposed on a second mounting surface of the end shield (2), The detection unit (3) is disposed in an axial position annularly surrounding a ball bearing (14) housed in the axial opening (5) of the end shield (2). Motor.

2. 2. The motor (1) according to claim 1, characterized in that the first mounting surface is in a first plane of the end shield (2), the second mounting surface is in a second plane, and the first plane is different from the second plane.

3. 2. The motor (1) according to claim 1, wherein the motor includes a stator (16) and a rotor (12), and when the end shield (2) is assembled to the motor (1), the detection unit (3) and the contact unit (4) face toward the internal space of the motor (1), the contact unit (4) faces toward the stator (16), and the detection unit faces toward the rotor (12).

4. 4. The motor (1) according to claim 1, wherein the detection unit (3) is electrically conductively connected to the contact unit (4) by a cable (8) extending in a radial direction (r) along the contour of the end shield (2).

5. A motor as described in claim 4, wherein the cable is a flat ribbon cable (8).

6. A motor (1) as described in any one of claims 1 to 5, characterized in that an active sensor component is attached to the back side of the detection unit (3) facing the end shield (2).

7. A motor (1) as described in any one of claims 1 to 6, characterized in that the contact unit (4) is provided with a terminal for contacting the stator coil, a control device terminal (6), and a connection portion to the detection unit (3).

8. A motor (1) as described in claim 2, characterized in that the ball bearing (14) is arranged in a plane different from the second plane.

9. A motor (1) as described in claim 8, characterized in that the contact unit (4) annularly surrounds the axial opening (5) of the end shield (2), but the axial opening (5) is provided in a plane different from the second plane.

10. A motor (1) as described in claim 2, characterized in that the contact unit (4) is in the form of a plate (4) and is attached to the second plane (B) of the end shield (2).

11. 11. Motor (1) according to any one of claims 1 to 10, characterized in that the sensing unit (3) is attached to the end shields via a support part (11).

12. 12. Motor (1) according to any one of claims 1 to 11, characterized in that the end shields (2) are made of plastic.

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