Motor drive circuit and motor device

Abstract

The embodiment of the utility model relates to the technical field of motors, in particular to a motor driving circuit and a motor device. The driving circuit enables the load circuit to be electrified through the switching circuit according to an input signal, so that the coil in the motor is charged, and the coil and the magnetic steel in the motor device generate a magnetic field to generate vibration; meanwhile, any two of the A end, the B end and the C end can be connected by the switching circuit, so that the magnetic field state is changed to realize rapid rotation of the motor.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a motor drive circuit and a motor device. Background Technology

[0002] With the increasing emphasis on quality of life, haptic feedback has become an essential application in daily life. Currently, miniature rotor vibration motors on the market are generally driven by DC or PWM, resulting in long start-up times (around 120ms) and stop times (around 150ms). These motors can only provide basic vibration alerts and cannot meet the demands of haptic feedback. Furthermore, they cannot start or stop quickly, leading to delayed and sluggish vibrations that provide a poor user experience. Additionally, if the motor is started and stopped quickly using high voltage, the shaft and bearings experience significant wear, reducing the motor's lifespan. Utility Model Content

[0003] In view of the above problems, this utility model provides a motor drive circuit and motor device, which solves the problem that existing motors cannot start and stop quickly, resulting in delayed and trailing vibrations that provide a poor user experience. Furthermore, if the motor is started and stopped quickly using high voltage, the shaft and bearings experience significant wear, thus reducing the motor's lifespan.

[0004] In a first aspect, this utility model provides a motor drive circuit, comprising:

[0005] The driving circuit has a first power supply terminal, a signal input terminal, a positive output terminal and a negative output terminal. The first power supply terminal is connected to the input circuit and the signal input terminal is connected to the external signal terminal.

[0006] The switching circuit is provided with a first input terminal, a second input terminal, a first switch terminal, a second switch terminal, and a third switch terminal. The first input terminal is connected to the positive output terminal, and the second input terminal is connected to the negative output terminal.

[0007] And a load circuit, including a first coil and a second coil that are adjacent to each other, the free end of the first coil is end A connected to the first switch terminal, the connection between the first coil and the second coil is end B, end B is connected to the second switch terminal, and the free end of the second coil is end C connected to the third switch terminal;

[0008] The driving circuit changes the signal direction of the positive and negative output terminals according to the external signal.

[0009] In some alternative embodiments, the load circuit further includes a first resistor, a second resistor, and a third resistor, wherein one end of the first resistor is connected to terminal A and the other end is connected to terminal B; one end of the second resistor is connected to terminal B and the other end is connected to terminal C; and one end of the third resistor is connected to terminal A and the other end is connected to terminal C.

[0010] In some alternative configurations, the drive circuit incorporates a boost module to boost the voltage input to the first power supply terminal and output it through either a positive or negative output terminal.

[0011] In some alternative configurations, the first power supply terminal is also connected to a first capacitor, the other end of which is grounded.

[0012] In some alternative embodiments, the switching circuit includes an F-PCB board and an H-PCB board. One end of the F-PCB board has two connecting pads and is connected to the positive and negative output terminals respectively through the connecting pads. The other end of the F-PCB board is connected to the H-PCB board through two brushes. The H-PCB board is provided with a commutator, which has six contacts evenly distributed. The six contacts are arranged in sequence along the circumference of the commutator as region A, region B, region C, region A, region B, and region C. Region A is connected to terminal A, region B is connected to terminal B, and region C is connected to terminal C.

[0013] In some alternative methods, when the two brushes are in contact with the commutator, any two of the A, B, and C terminals are made to conduct.

[0014] Secondly, this utility model provides a motor device that integrates the aforementioned motor drive circuit, the motor device comprising:

[0015] The motor body includes a housing, an F-PCB board, a magnet, and a rotating shaft. The F-PCB board and the magnet are fixed to the bottom of the housing, and the rotating shaft is located in the middle of the housing.

[0016] The rotor assembly includes a bearing, an injection molded part, a vibrator, an H-PCB board, and a coil. The bearing, vibrator, H-PCB board, and coil are fixed inside the injection molded part, and the bearing is sleeved on the rotor. The H-PCB board is electrically connected to the brushes on the F-PCB board and is connected to the coil.

[0017] In some alternative configurations, the first and second protrusions at the midpoints of the upper and lower ends of the housing are arranged opposite to each other, and the pivot is disposed between the first and second protrusions; the first protrusion and the housing enclose a first groove, a second groove is provided at the bottom of the first groove, the F-PCB board is fixed in the second groove, and the magnet is disposed in the second groove.

[0018] In some alternative configurations, the bearing, injection molded part, vibrator, and coil are integrally injection molded in-mold; wherein the H-PCB board is disposed on one surface of the injection molded part, and two coils are symmetrically disposed on the injection molded part along the vibrator.

[0019] In some alternative configurations, the shaft is a ceramic shaft and the bearing is a ceramic bearing.

[0020] This utility model provides a motor drive circuit and a motor device, which have the following advantages compared to the prior art:

[0021] (1) The drive circuit of this utility model energizes the load circuit through the switch circuit according to the input signal, thereby charging the coil in the motor and generating a magnetic field with the magnet inside the motor device, thereby generating vibration; at the same time, the switch circuit can connect any two of the A, B and C ends, thereby changing the magnetic field state to achieve rapid rotation of the motor.

[0022] (2) This utility model also sets up a drive circuit so that the drive circuit changes the signal direction of the positive output terminal and the negative output terminal according to the external signal; it can make the motor stop quickly, the inertial motion of the motor will disappear, the vibration of the motor will be crisper, without the feeling of trailing, and improve the user's physical experience.

[0023] (3) This utility model also improves the motor life and reduces motor noise by designing the rotating shaft as a ceramic rotating shaft and the bearing as a ceramic bearing.

[0024] The above description is merely an overview of the technical solutions of the present utility model embodiments. In order to better understand the technical means of the present utility model embodiments and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present utility model embodiments more obvious and understandable, specific embodiments of the present utility model are described below. Attached Figure Description

[0025] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0026] Figure 1 A schematic diagram of the motor drive circuit provided by this utility model is shown.

[0027] Figure 2 A circuit diagram of the motor drive circuit provided by this utility model is shown.

[0028] Figure 3 A schematic diagram of the F-PCB board provided by this utility model is shown;

[0029] Figure 4 A schematic diagram of the H-PCB board provided by this utility model is shown;

[0030] Figure 5 An exploded schematic diagram of the motor device provided by this utility model is shown;

[0031] Figure 6 A cross-sectional schematic diagram of the motor device provided by this utility model is shown.

[0032] in,

[0033] 110. Drive circuit; 120. Switching circuit; 130. Load circuit;

[0034] MCU (Microcontroller Unit), main control chip; U1 (Driver Chip); U2 (Switch Chip); L1 (First Coil); L2 (Second Coil); R1 (First Resistor); R2 (Second Resistor); R3 (Third Resistor); C1 (First Capacitor);

[0035] 300, F-PCB board; 310, connecting pads; 320, brush;

[0036] 400. H-PCB board; 410. Commutator;

[0037] 510. Motor body; 520. Rotor assembly; 511. Lower housing; 512. Shaft; 513. Magnet; 514. Upper housing; 521. Injection molded part; 522. Coil; 523. Vibrator; 524. Bearing. Detailed Implementation

[0038] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein.

[0039] Example 1:

[0040] Figure 1-2 This invention illustrates a motor drive circuit, which is used in a motor to drive the motor device for rapid start-up and rapid stop. Specifically, it includes a drive circuit, a switching circuit 120, and a load circuit 130.

[0041] The driving circuit has a first power supply terminal, a signal input terminal, a positive output terminal, and a negative output terminal. The first power supply terminal is connected to the input circuit, and the signal input terminal is connected to the external signal terminal. The driving circuit is used to receive signals from the main control chip MCU of mobile terminals such as mobile phones, watches, and tablets, so that the positive output terminal and the negative output terminal output corresponding electrical signals, thereby realizing the rotation of the motor.

[0042] The switching circuit 120 is provided with a first input terminal, a second input terminal, a first switch terminal, a second switch terminal, and a third switch terminal. The first input terminal is connected to the positive output terminal, and the second input terminal is connected to the negative output terminal. The switching circuit 120 is used to receive control signals from the drive circuit, thereby controlling the energization of the first coil L1 and the second coil L2 of the motor device. The switching circuit 120 can be integrated into the switching chip U2, wherein the switching chip U2 can have a corresponding relationship between the first input terminal, the second input terminal, and the first switch terminal, the second switch terminal, and the third switch terminal.

[0043] The load circuit 130 includes a first coil L1 and a second coil L2 that are adjacent to each other. The free end of the first coil L1 is end A, which is connected to the first switch terminal. The end connecting the first coil L1 and the second coil L2 is end B, which is connected to the second switch terminal. The free end of the second coil L2 is end C, which is connected to the third switch terminal. The load circuit 130 is connected to the first switch terminal, the second switch terminal, and the third switch terminal through ends A, B, and C. By receiving the first switch terminal, the second switch terminal, and the third switch terminal, any two ends of ends A, B, and C can be connected in series to conduct electricity, thereby realizing the rotation of the motor.

[0044] As can be seen, through the motor drive circuit designed in this application, the drive circuit energizes the load circuit 130 through the switch circuit 120 according to the input signal, thereby charging the coil in the motor and generating a magnetic field with the magnet 513 inside the motor device, thereby generating vibration; at the same time, the switch circuit 120 can connect any two of the A, B and C terminals, thereby changing the magnetic field state to achieve rapid rotation of the motor.

[0045] Furthermore, it should be noted that this application is applied to a DC-driven rotor motor. The rotor motor can realize tactile feedback function, generate a strong vibration instantaneously, and stop quickly. It can replace the current linear motor and avoid the problems of high price, complex process and expensive driver IC of linear motor.

[0046] In some alternative configurations, the drive circuit changes the signal directions of the positive and negative output terminals based on an external signal. This invention also enables the motor to stop quickly by changing the signal directions of the positive and negative output terminals according to an external signal; this eliminates the motor's inertial motion, resulting in a crisper motor vibration without any trailing sensation, thus improving the user experience.

[0047] Example 2:

[0048] Based on Embodiment 1, this utility model discloses a motor drive circuit, specifically including a drive circuit, a switching circuit 120, and a load circuit 130. Its specific circuit structure includes: a drive circuit, comprising a first power supply terminal, a signal input terminal, a positive output terminal, and a negative output terminal; the first power supply terminal is connected to the input circuit, and the signal input terminal is connected to the external signal terminal; a switching circuit 120, comprising a first input terminal, a second input terminal, a first switch terminal, a second switch terminal, and a third switch terminal; the first input terminal is connected to the positive output terminal, and the second input terminal is connected to the negative output terminal; and a load circuit 130, comprising a first coil L1 and a second coil L2 adjacent to each other; the free end of the first coil L1 is terminal A connected to the first switch terminal; the connection point between the first coil L1 and the second coil L2 is terminal B, which is connected to the second switch terminal; and the free end of the second coil L2 is terminal C connected to the third switch terminal.

[0049] In some alternative configurations, the load circuit 130 further includes a first resistor R1, a second resistor R2, and a third resistor R3. One end of the first resistor R1 is connected to terminal A and the other end is connected to terminal B; one end of the second resistor R2 is connected to terminal B and the other end is connected to terminal C; and one end of the third resistor R3 is connected to terminal A and the other end is connected to terminal C. In this embodiment, the first resistor R1, the second resistor R2, and the third resistor R3 are connected in parallel with the first coil L1 and the second coil L2, serving to eliminate electrical sparks and suppress electrical noise.

[0050] In some optional configurations, the drive circuit incorporates a boost module to boost the voltage input to the first power supply terminal and output it through either a positive or negative output terminal. In this embodiment, the drive circuit can be integrated into the drive chip U1, which may be an AW86204 chip. The drive circuit includes a boost module to boost the power supply voltage of the motor device from the input voltage of 1-2V to 3V-5V. Using the dedicated drive chip U1 to drive the motor, a relatively high voltage is instantaneously applied, causing the motor to rotate quickly, such as within approximately 40ms, thus creating vibration to achieve a touch control effect. Simultaneously, the drive circuit also integrates an inverting output module, which can be implemented through multiple MOSFETs, providing a braking signal to the motor in reverse, causing it to stop quickly, such as within approximately 50ms. The inertial motion of the motor disappears, resulting in a crisper vibration during touch control without any trailing sensation, improving the user experience.

[0051] In some alternative configurations, a first capacitor C1 is also connected to the first power supply terminal, with the other end of the first capacitor C1 grounded. In this embodiment, the driving circuit is connected to the first capacitor C1 to filter noise and protect the circuit.

[0052] In some alternative methods, see Figure 3-4 The switching circuit 120 includes an F-PCB board 300 and an H-PCB board 400. One end of the F-PCB board has two pads connected to the positive and negative output terminals respectively. The other end of the F-PCB board is connected to the H-PCB board 400 via two brushes 320. The H-PCB board 400 has a commutator 410 with six contacts evenly distributed around it. These six contacts are sequentially designated as region A, region B, region C, region A, region B, and region C along the circumference of the commutator 410. Region A is connected to terminal A, region B is connected to terminal B, and region C is connected to terminal C. In this embodiment, when the two brushes 320 contact the commutator 410, any two of terminals A, B, and C are made conductive. The first coil L1 and the second coil L2 are connected to the H-PCB board 400. The first resistor R1, the second resistor R2, and the third resistor R3 are integrated in the H-PCB board 400. The switching circuit 120 is implemented by the commutator 410 of the F-PCB and H-PCB. The drive circuit can be located on the F-PCB or outside the motor assembly, and is electrically connected to the switching circuit 120. The contact sequence of the brush 320 and the six contacts of the commutator 410 is: AB-AC-BC-BA-AB-AC-BC-BA-CA-CB. The first resistor R1, the second resistor R2, and the third resistor R3 can be single-phase resistors or two-phase resistors.

[0053] Example 3:

[0054] Figure 5-6 An embodiment of a motor device according to the present invention is shown. This embodiment integrates the motor drive circuits of the above embodiments 1 and 2. The motor device includes a motor body 510 and a rotor assembly 520.

[0055] The motor body 510 specifically includes a housing, an F-PCB board 300, a magnet 513, and a rotating shaft 512. The F-PCB board 300 and the magnet 513 are fixed to the bottom of the housing, and the rotating shaft 512 is located in the middle of the housing. The housing has a first boss and a second boss at its upper and lower ends, which are positioned opposite each other. The rotating shaft 512 is located between the first boss and the second boss. The first boss and the housing form a first groove, and a second groove is provided at the bottom of the first groove. The F-PCB board 300 is fixed in the second groove, and the magnet 513 is located in the second groove. The housing may include an upper housing 514 and a lower housing 511, which are fixed by glue or welding.

[0056] The rotor assembly 520 specifically includes a bearing 524, an injection molded part 521, a vibrator 523, an H-PCB board 400, and a coil 522. The bearing 524, vibrator 523, H-PCB board 400, and coil are fixed within the injection molded part 521, and the bearing 524 is sleeved on the rotor. The H-PCB board 400 is electrically connected to the brush 320 on the F-PCB and is also connected to the coil. The bearing 524, injection molded part 521, vibrator 523, and coil are integrally injection molded in-mold. The H-PCB board 400 is disposed on one surface of the injection molded part 521, and two coils are symmetrically arranged on the injection molded part 521 along the vibrator 523. The coil 522 includes a first coil L1 and a second coil L2.

[0057] In this embodiment, the drive circuit can be located outside the motor device, and the drive circuit is electrically connected to the F-PCB board 300 of the motor device. The switching circuit 120 includes a commutator 410 of the F-PCB board 300 and the H-PCB board 400. The F-PCB board 300 is provided with a brush 320 and is connected to the H-PCB through the brush 320. The switching circuit 120 includes an F-PCB board 300 and an H-PCB board 400. One end of the F-PCB board has two connecting pads 310, which are connected to the positive and negative output terminals respectively. The other end of the F-PCB board is connected to the H-PCB board 400 via two brushes 320. The H-PCB board 400 has a commutator 410 with six contacts evenly distributed around it. These six contacts are sequentially designated as region A, region B, region C, region A, region B, and region C along the circumference of the commutator 410. Region A is connected to terminal A, region B is connected to terminal B, and region C is connected to terminal C. In this embodiment, when the two brushes 320 contact the commutator 410, any two of terminals A, B, and C are made conductive. The first coil L1 and the second coil L2 are connected to the H-PCB board 400. The first resistor R1, the second resistor R2, and the third resistor R3 are integrated in the H-PCB board 400. The switching circuit 120 is implemented by the commutator 410 of the F-PCB and H-PCB. The drive circuit can be set on the F-PCB or outside the motor device. The drive circuit is electrically connected to the switching circuit 120.

[0058] In some alternative configurations, the rotating shaft 512 is a ceramic rotating shaft 512, and the bearing 524 is a ceramic bearing 524. The drive circuit of this invention, based on the input signal, energizes the load circuit 130 via the switching circuit 120, thereby charging the coil in the motor and generating a magnetic field with the magnet 513 inside the motor device, thus producing vibration. Simultaneously, the switching circuit 120 can connect any two of terminals A, B, and C, thereby changing the magnetic field state to achieve rapid motor rotation. This invention also allows the drive circuit to change the signal direction of the positive and negative output terminals based on external signals; this enables the motor to stop quickly, eliminating inertial motion and resulting in a crisper vibration without any trailing sensation, improving the user experience. Furthermore, by designing the rotating shaft 512 and bearing 524 as ceramic rotating shafts 512 and 524, this invention reduces wear caused by high-speed starting and stopping of the rotating shaft 512 and bearing 524, thereby increasing motor life and reducing motor noise.

[0059] The algorithms or displays provided herein are not inherently related to any particular computer, virtual system, or other device. Furthermore, the embodiments of this invention are not directed to any particular programming language.

[0060] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. Similarly, for the sake of brevity and to aid in understanding one or more aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the embodiments of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. The claims, which follow the detailed description, are hereby expressly incorporated into that detailed description, wherein each claim itself constitutes a separate embodiment of the invention.

[0061] Those skilled in the art will understand that the modules in the device of the embodiment can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiment can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components, except that at least some of such features and / or processes or units are mutually exclusive.

[0062] It should be noted that the above embodiments are illustrative of the present invention and not restrictive of it, and those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims listing several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be construed as limiting the order of execution.

Claims

1. A motor drive circuit, characterized in that, include: The driving circuit has a first power supply terminal, a signal input terminal, a positive output terminal and a negative output terminal. The first power supply terminal is connected to the input circuit and the signal input terminal is connected to the external signal terminal. The switching circuit is provided with a first input terminal, a second input terminal, a first switch terminal, a second switch terminal, and a third switch terminal. The first input terminal is connected to the positive output terminal, and the second input terminal is connected to the negative output terminal. And a load circuit, including a first coil and a second coil that are adjacent to each other, the free end of the first coil is end A connected to the first switch terminal, the connection between the first coil and the second coil is end B, end B is connected to the second switch terminal, and the free end of the second coil is end C connected to the third switch terminal; The driving circuit changes the signal direction of the positive and negative output terminals according to the external signal.

2. The motor drive circuit according to claim 1, characterized in that, The load circuit further includes a first resistor, a second resistor, and a third resistor. One end of the first resistor is connected to terminal A and the other end is connected to terminal B. One end of the second resistor is connected to terminal B and the other end is connected to terminal C. One end of the third resistor is connected to terminal A and the other end is connected to terminal C.

3. The motor drive circuit according to claim 1, characterized in that, The driving circuit has a built-in boost module to boost the voltage input from the first power supply terminal and output it through the positive or negative output terminal.

4. A motor drive circuit according to claim 3, characterized in that, The first power supply terminal is also connected to a first capacitor, and the other end of the first capacitor is grounded.

5. A motor drive circuit according to claim 1, characterized in that, The switching circuit includes an F-PCB board and an H-PCB board. One end of the F-PCB board has two connecting pads, which are connected to the positive and negative output terminals respectively. The other end of the F-PCB board is connected to the H-PCB board through two brushes. The H-PCB board is equipped with a commutator, which has six contacts evenly distributed. The six contacts are arranged in the following order along the circumference of the commutator: region A, region B, region C, region A, region B, and region C. Region A is connected to terminal A, region B is connected to terminal B, and region C is connected to terminal C.

6. A motor drive circuit according to claim 1, characterized in that, When the two brushes come into contact with the commutator, any two of the A, B, and C terminals will be made to conduct.

7. A motor device, characterized in that, The motor device, which integrates the motor drive circuit according to any one of claims 1-6, comprises: The motor body includes a housing, an F-PCB board, a magnet, and a rotating shaft. The F-PCB board and the magnet are fixed to the bottom of the housing, and the rotating shaft is located in the middle of the housing. The rotor assembly includes a bearing, an injection molded part, a vibrator, an H-PCB board, and a coil. The bearing, vibrator, H-PCB board, and coil are fixed inside the injection molded part, and the bearing is sleeved on the rotor. The H-PCB board is electrically connected to the brushes on the F-PCB board and is connected to the coil.

8. A motor device according to claim 7, characterized in that, The first and second protrusions are located at the middle of the upper and lower ends of the housing, and are arranged opposite to each other. The rotating shaft is located between the first and second protrusions. The first protrusion and the housing form a first groove. A second groove is provided at the bottom of the first groove. The F-PCB board is fixed in the second groove. The magnet is located in the second groove.

9. A motor device according to claim 7, characterized in that, The bearing, injection molded part, vibrator and coil are integrally injection molded in the mold; wherein, the H-PCB board is disposed on one surface of the injection molded part, and the two coils are symmetrically disposed on the injection molded part along the vibrator.

10. The motor device according to any one of claims 8 or 9, characterized in that, The rotating shaft is a ceramic rotating shaft, and the bearing is a ceramic bearing.

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