Electric-motor system having protective excitation coil driving device

Abstract

An electric-motor system having a protective excitation coil driving device. The electric-motor system comprises an electric-motor housing (1), an electric-motor rotor assembly (2), an electric-motor stator assembly (3) and a wiring structure (4), wherein the electric-motor stator assembly (3) is relatively fixedly connected in the electric-motor housing (1); the electric-motor rotor assembly (2) is rotatably connected to the electric-motor housing (1) relative to the electric-motor stator assembly (3); the electric-motor rotor assembly (2) and the electric-motor stator assembly (3) are provided with an excitation coil (5) and a permanent magnet (6), respectively, or are provided with a permanent magnet (6) and an excitation coil (5), respectively, such that an electric motor generates an electrodynamic potential when the electric-motor rotor assembly (2) rotates relative to the electric-motor stator assembly (3) in a non-energized operating state; and the excitation coil (5) is connected in parallel to an over-voltage protection device (7), and the over-voltage protection device (7) may be arranged on a wiring board (41) of the electric motor or on a main control board of an upper computer. A product using the electric motor effectively avoids the generation of a relatively high electrodynamic potential during rotation in a non-energized state and under the action of an external force, which may damage a driving device electrically connected thereto, and a reliable electric-motor product can be provided from the source, thereby ensuring that the product using the electric motor has reliable and safe performance.

Description

A motor system with protection for excitation coil drive devices [Technical Field]

[0001] This utility model relates to motor technology, and in particular to a motor system with a protective excitation coil driving device. [Background Technology]

[0002] There are many types of motors, and their applications are very widespread. Motors used in everyday life include household appliances such as air conditioners, refrigerators, and security cameras. These motors are micro-motors, generally stepper motors. Their structure mainly includes a rotor assembly with permanent magnets and a stator assembly with excitation coils fixedly connected to the housing. Motors of this type are usually shipped as bare units without driver components and are driven by a host computer during actual use. When these household appliances are in use, especially when the appliance is not powered on (such as security cameras), people often try to directly rotate the camera by hand to understand its range of motion. This improper operation causes the rotor assembly of the motor to rotate relative to the stator assembly, generating a corresponding electromotive force (EMF). Figure 4 shows the EMF generated by the motor in a security camera when it is not powered on, measured by manually rotating the camera.

[0003] Therefore, since home appliances such as air conditioners, refrigerators, and security cameras use motors with the above-mentioned structure, they need to be controlled through a host computer. The host computer's main control board is equipped with some electronic components, including driver devices for driving the motor. These driver devices have corresponding rated voltages and rated currents, such as chips and diodes. If the motor is rotated directly by human intervention, causing the electromotive force generated by the motor to exceed the rated voltage of the corresponding driver device, it will cause damage and render the product unusable.

[0004] In view of the above-mentioned technical problems, this utility model is proposed in this study.

[0005] [Utility Model Content]

[0006] The technical problem to be solved by this utility model is to provide a motor system with protection for the excitation coil drive device. By connecting an overvoltage protection device in parallel with the excitation coil, the overvoltage protection device can be set on the motor terminal block or on the host computer main control board. Products using this motor effectively avoid the generation of high electromotive force when rotating under external force without being energized, which would damage the drive device electrically connected to it. Therefore, by adopting the technical solution of this utility model, reliable motor products can be provided from the source, ensuring the reliable and safe performance of products using this motor.

[0007] To solve the above-mentioned technical problems, this utility model provides a motor system with a protected excitation coil driving device, including a motor housing 1, a motor rotor assembly 2, a motor stator assembly 3, and a wiring structure 4. The motor stator assembly 3 is relatively fixedly connected to the motor housing 1, and the motor rotor assembly 2 is rotatably connected to the motor housing 1 relative to the motor stator assembly 3. The motor rotor assembly 2 and the motor stator assembly 3 are respectively provided with an excitation coil 5 and a permanent magnet 6, so that when the motor rotor assembly 2 rotates relative to the motor stator assembly 3 in the non-energized working state, an electromotive force is generated. The excitation coil 5 is connected in parallel with an overvoltage protection device 7.

[0008] As described above, a motor system with a protective excitation coil driving device is provided. The motor rotor assembly 2 is provided with a permanent magnet 6, and the motor stator assembly 3 is provided with an excitation coil 5. The wiring structure 4 includes a terminal block 41. The terminals of the excitation coil 5 are electrically connected to the terminal block 41, and the overvoltage protection device 7 is provided on the terminal block 41 and connected in parallel with the excitation coil 5.

[0009] As described above, a motor system with a protected excitation coil driving device includes a motor stator assembly 3 comprising a coil frame 31, wherein the excitation coil 5 is wound on the coil frame 31, and the wiring structure 4 further comprises a pin 42 fixedly connected to the coil frame 31. The terminal block 41 is relatively fixedly connected to the side of the coil frame 31 via the pin 42, and the pin 42 is electrically connected to the terminal block 41. The terminals of the excitation coil 5 are correspondingly electrically connected to the pin 42.

[0010] As described above, in a motor system with a protective excitation coil driving device, the wiring structure 4 further includes a terminal block 43 electrically connected to the terminal block 41, or the wiring structure 4 further includes a lead wire 45 electrically connected to the terminal block 41.

[0011] As described above, in a motor system with a protective excitation coil drive device, the wiring structure 4 further includes a junction box 44 for connecting to the motor housing 1 to cover the junction box 41.

[0012] As described above, a motor system with a protection device for the excitation coil drive includes a wiring structure 4 with a host computer connection terminal on the host computer main control board that can be electrically connected to the excitation coil 5. The overvoltage protection device 7 is located on the host computer main control board and is electrically connected to the host computer connection terminal.

[0013] In the motor system described above with protection for the excitation coil drive device, the overvoltage protection device 7 is a transient voltage suppression diode.

[0014] Compared with existing technologies, this utility model, by connecting an overvoltage protection device in parallel with the excitation coil, effectively avoids the generation of high electromotive force that could damage the electrically connected drive components when the motor rotates under external force without being energized. Therefore, by adopting this utility model's technical solution, reliable motor products can be provided from the source, ensuring the reliable and safe performance of products using this motor. Moreover, this solution has a simple structural design and relatively economical manufacturing cost, which can greatly improve the reliability of the product. [Attached Image Description]

[0015] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0016] Figure 1 is a schematic diagram of the connection between this utility model and the host computer.

[0017] Figure 2 shows an embodiment of the present invention in which the motor is electrically connected to the terminal block using wiring leads.

[0018] Figure 3 shows another embodiment of the motor of this utility model, in which the wiring terminals are electrically connected to the wiring board.

[0019] Figure 4 shows an experimental diagram of a security camera using a common motor generating an electromotive force when manually rotated.

[0020] Figure 5 is an experimental diagram showing the electromotive force generated by a security camera using the motor of this invention when manually rotated.

[0021] Figure 6 is a schematic diagram of another embodiment of the present invention in which the overvoltage protection device is set on the host computer main control board.

Detailed Implementation Methods

[0022] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0023] As shown in Figures 1-3 and 5-6, this utility model discloses a motor system with a protective excitation coil driving device, comprising a motor housing 1, a motor rotor assembly 2, a motor stator assembly 3, and a wiring structure 4. The motor stator assembly 3 is relatively fixedly connected to the motor housing 1, and the motor rotor assembly 2 is rotatably connected to the motor housing 1 relative to the motor stator assembly 3. The motor rotor assembly 2 and the motor stator assembly 3 are respectively provided with an excitation coil 5 and a permanent magnet 6, that is, when the motor rotor assembly 2 is provided with a permanent magnet 6, the motor stator assembly 3 is provided with an excitation coil 5; or when the motor rotor assembly 2 is provided with an excitation coil 5, the motor stator assembly 3 is provided with a permanent magnet 6. With this motor structure, when the rotor assembly rotates without power, the motor transforms into a generator. Therefore, when the rotor assembly 2 rotates relative to the stator assembly 3 in the non-powered operating state, it generates an electromotive force (EMF). When this EMF is output in reverse to the host computer's main control board, the driving devices on the board will be affected. Especially when the generated EMF exceeds the rated voltage of the driving devices, the corresponding driving devices may be burned out, as shown in Figures 1-3. To effectively protect the driving devices on the host computer's main control board, each excitation coil 5 on the motor is connected in parallel with an overvoltage protection device 7. Preferably, the overvoltage protection device 7 is a transient voltage suppression diode. The selection of the transient voltage suppression diode mainly considers the rated voltage of the driving device. As shown in Figure 5, the overvoltage protection device 7 effectively ensures that the peak value of the generated EMF is lower than the rated voltage of the driving device.

[0024] As shown in Figures 2 and 3, the wiring structure 4 includes a terminal block 41, the terminals of the excitation coil 5 are electrically connected to the terminal block 41, and the overvoltage protection device 7 is disposed on the terminal block 41 and connected in parallel with the excitation coil 5; the motor stator assembly 3 includes a coil frame 31, the excitation coil 5 is wound on the coil frame 31, the wiring structure 4 also includes a pin 42 fixedly connected to the coil frame 31, the terminal block 41 is relatively fixedly connected to the side of the coil frame 31 through the pin 42, and the pin 42 is electrically connected to the terminal block 41, and the terminals of the excitation coil 5 are correspondingly electrically connected to the pin 42; the wiring structure 4 also includes a terminal block 43 electrically connected to the terminal block 41, or the wiring structure 4 also includes a lead wire 45 electrically connected to the terminal block 41; the wiring structure 4 also includes a junction box 44 for connecting to the motor housing 1 to cover the terminal block 41. Therefore, the connection structure of this utility model is simple and has almost no impact on the original installation and assembly process, so the manufacturing cost is minimally affected, but it effectively improves the reliability of products using this motor.

[0025] As shown in Figure 6, in another embodiment of this utility model, the wiring structure 4 includes a host computer connection terminal that can be electrically connected to the excitation coil 5, which is set on the host computer main control board. The overvoltage protection device 7 is set on the host computer main control board and electrically connected to the host computer connection terminal. When connected and used, the motor is electrically connected to the host computer connection terminal, thereby making the excitation coil 5 and the overvoltage protection device 7 connected in parallel. This design structure can also effectively protect the driving devices on the host computer main control board.

Claims

1. An electric motor system having a protection excitation coil driving device, characterized by The motor comprises a motor housing (1), a motor rotor assembly (2), a motor stator assembly (3) and a wiring structure (4), the motor stator assembly (3) is fixedly connected in the motor housing (1), the motor rotor assembly (2) is rotatably connected in the motor housing (1) relative to the motor stator assembly (3), the motor rotor assembly (2) and the motor stator assembly (3) are respectively provided with an excitation coil (5) and a permanent magnet (6), so that the motor generates an electromotive force when the motor rotor assembly (2) rotates relative to the motor stator assembly (3) in a non-powered working state, and the excitation coil (5) is connected in parallel with an overvoltage protection device (7).

2. The motor system having a protection device for a field coil driver according to claim 1, characterized by The motor rotor assembly (2) is provided with the permanent magnet (6), and the motor stator assembly (3) is provided with the excitation coil (5), the wiring structure (4) comprises a wiring board (41), the wiring ends of the excitation coil (5) are electrically connected with the wiring board (41), and the overvoltage protection device (7) is arranged on the wiring board (41) and connected in parallel with the excitation coil (5).

3. The motor system having a protection device for a field coil driver according to claim 2, characterized by The motor stator assembly (3) comprises a coil holder (31), the excitation coil (5) is wound on the coil holder (31), the wiring structure (4) further comprises a pin (42) fixedly connected to the coil holder (31), the wiring board (41) is fixedly connected to the side of the coil holder (31) through the pin (42), the pin (42) is electrically connected with the wiring board (41), and the wiring ends of the excitation coil (5) are electrically connected with the pin (42) correspondingly.

4. The motor system having a protection device for a field coil driver according to claim 3, characterized by The wiring structure (4) further comprises a wiring terminal (43) electrically connected with the wiring board (41), or the wiring structure (4) further comprises a wiring lead wire (45) electrically connected with the wiring board (41).

5. The motor system having a protection device for a field coil driver according to claim 3, wherein The wiring structure (4) further comprises a wiring box (44) used for connecting with the motor housing (1) to cover the wiring board (41).

6. The motor system having a protection device for a field coil driver according to claim 1, wherein The wiring structure (4) comprises a host computer connection terminal arranged on a host computer main control board and electrically connected with the excitation coil (5), and the overvoltage protection device (7) is arranged on the host computer main control board and electrically connected with the host computer connection terminal.

7. The motor system having a device for protecting a field coil driver according to any one of claims 1 to 6, characterized in that The overvoltage protection device (7) is a transient voltage suppression diode.

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