A brushless motor integrated with a motor drive control board

Abstract

The utility model relates to the field of brushless motor discloses a kind of brushless motor of integrated motor drive control panel, including casing, coaxial rotation installation shaft in casing, rotor is fixedly sleeved on the shaft;Coaxial fixed installation stator in casing, stator is sleeved again outside rotor;Motor drive board is installed in casing, and motor drive board is integrated motor drive circuit;Motor drive board is connected in the outer circle of stator;A plurality of stator phase line terminals are fixedly arranged on stator, and a plurality of stator phase line terminals are distributed on stator along the circumference of shaft;Motor drive board is welded on a plurality of stator phase line terminals, and a plurality of stator phase line terminals are electrically connected with motor drive board.The utility model's motor drive board is the board that integrated motor drive circuit is used, size is smaller, can effectively prevent the existence of blocking wind when using installation, and wind power transmission efficiency can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of brushless motors, and in particular to a brushless motor with an integrated motor drive control board. Background Technology

[0002] Although brushless motors have a short history of development in my country, they have experienced rapid growth due to the increasing maturity and perfection of the technology. They are now widely used in various fields such as model aircraft, medical devices, home appliances, and electric vehicles.

[0003] In existing brushless motors, the motor driver board and power control PCB board are combined. The high voltage safety distance issue of the motor driver board results in a large size of the power control PCB board, which can cause problems such as air blockage and low air transmission efficiency during use and installation.

[0004] Therefore, it is necessary to solve the above problems by using a brushless motor with an integrated motor drive control board. Utility Model Content

[0005] The purpose of this invention is to provide a brushless motor with an integrated motor drive control board to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a brushless motor with an integrated motor drive control board, comprising a housing, a rotating shaft coaxially rotatably mounted inside the housing, and a rotor fixedly sleeved on the rotating shaft; and a stator coaxially fixedly mounted inside the housing, with the stator sleeved outside the rotor.

[0007] A motor drive board is installed inside the housing, and the motor drive board integrates a motor drive circuit.

[0008] The motor drive board is connected within the projection lines of the outer circumference of the stator;

[0009] A plurality of stator phase wire terminals are fixedly provided on the stator, and the plurality of stator phase wire terminals are evenly distributed on the stator along the circumference of the rotating shaft;

[0010] The motor drive board is welded to several stator phase terminals, and the several stator phase terminals are electrically connected to the motor drive board.

[0011] Preferably, the winding pattern on the stator is star-shaped or triangular.

[0012] Preferably, the winding on the stator is single-phase, and the number of stator phase terminals is two.

[0013] Preferably, the windings on the stator are three-phase, and the number of stator phase terminals is three.

[0014] Preferably, the motor drive board further includes: an external power supply terminal, an external control terminal, an MCU, a phase line interface terminal, and a current sampling circuit;

[0015] The external power supply terminal is connected to the MCU and the motor drive circuit. The external control terminal is connected to the MCU and the motor drive circuit. The MCU is connected to the motor drive circuit and the current sampling circuit. The motor drive circuit is connected to the current sampling circuit. The motor drive circuit is connected to the phase line interface terminal.

[0016] The technical effects and advantages of this utility model are as follows:

[0017] First, the motor drive board of this utility model uses an integrated motor drive circuit board, which is small in size, can effectively prevent air blockage during use and installation, and can effectively improve the efficiency of wind power transmission.

[0018] Secondly, the motor drive board of this utility model uses an integrated motor drive circuit board, which is small in size. The wind will blow directly onto the power devices on the motor drive board, producing a forced air cooling effect, which can reduce the signal transmission loss of the power devices and lower the device temperature, thus improving the service life of the power devices.

[0019] Third, the motor drive board of this utility model uses an integrated motor drive circuit board, which can be directly programmed with software and used immediately without additional software modulation; the motor drive is integrated on the motor, and the motor can run after shipment, reducing the time and manpower for customers to debug the motor, simplifying the difficulty of motor debugging in the market, and lowering the entry barrier for motor terminals.

[0020] Fourth, the motor drive board of this utility model uses an integrated motor drive circuit board, which reduces the number of components, saves costs, and improves efficiency.

[0021] Fifth, the motor drive board of this utility model uses an integrated motor drive circuit board, which can reduce the number of stator phase wire terminals on the stator, saving installation time and cost. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a three-dimensional explosion diagram of the present invention;

[0024] Figure 3 This is a schematic diagram of the motor drive board structure of this utility model;

[0025] Figure 4 This is a schematic diagram of the circuit connection of the motor drive board of this utility model;

[0026] Figure 5This is a front view of the motor drive board of this utility model;

[0027] Figure 6 This is a schematic diagram of the back of the motor drive board of this utility model.

[0028] In the diagram: 1. Housing; 2. Stator; 3. Rotor; 4. Shaft; 5. Stator phase terminal; 20. Phase interface terminal; 21. Motor drive board; 211. Motor drive circuit; 2111. Half-bridge inverter module; 212. External power supply terminal; 213. External control terminal; 214. MCU. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0030] This utility model provides, for example Figures 1 to 6 The brushless motor shown includes a housing 1. A rotating shaft 4 is coaxially rotatably mounted inside the housing 1, and a rotor 3 is fixedly sleeved on the rotating shaft 4. A stator 2 is coaxially fixedly mounted inside the housing 1, and the stator 2 is sleeved outside the rotor 3.

[0031] A motor drive board 21 is installed inside the housing 1, and the motor drive board 21 integrates the motor drive circuit. The motor drive board 21 is perpendicular to the rotating shaft 4, and the motor drive board 21 is connected within the projection line of the outer circumference of the stator 2.

[0032] In this embodiment, the motor drive board 21 uses system integration design, local chemical etching, secondary high voltage physical insulation and other processes to reduce the surface area of ​​the motor drive board 21 away from the stator 2 to less than or equal to the outer diameter of the stator 2.

[0033] It should be noted that the shape of the motor drive board 21 is not limited and can be circular or square, etc.

[0034] A plurality of stator phase terminals 5 are fixedly disposed on the stator 2, and the plurality of stator phase terminals 5 are evenly distributed on the stator 2 along the circumference of the rotating shaft 4. The motor drive board 21 is welded to the plurality of stator phase terminals 5, and the plurality of stator phase terminals 5 are electrically connected to the motor drive board 21.

[0035] Specifically, the winding pattern on stator 2 is either star-shaped or triangular.

[0036] If the winding on stator 2 is single-phase, then the number of stator phase terminals 5 is two.

[0037] If the windings on stator 2 are three-phase, then the number of stator phase terminals 5 is three.

[0038] The motor drive board 21 includes: an external power supply terminal 212, an external control terminal 213, an MCU 214, a half-bridge inverter module 211, a phase line interface terminal 20, and a current sampling circuit.

[0039] External power supply terminal 212 is connected to MCU 214 and motor drive circuit 211. External control terminal 213 is connected to MCU 214 and motor drive circuit 211. MCU 214 is connected to motor drive circuit 211 and current sampling circuit. Motor drive circuit 211 is connected to current sampling circuit. Motor drive circuit 211 is connected to phase line interface terminal 20. Motor drive circuit 211 includes three half-bridge inverter modules 2111, namely half-bridge inverter module U1, half-bridge inverter module U2, and half-bridge inverter module U3.

[0040] All stator phase terminals 5 are much lower in height than other terminals and are connected via internal metal rings in the plastic frame, eliminating the need for short-circuiting through the PCB. Two or three stator phase terminals 5 need to be soldered, reducing the number of soldering operations and improving efficiency. In this implementation, the high-voltage miniaturization and internal insulation characteristics of the half-bridge inverter module are utilized, allowing the half-bridge inverter module to be compatible with both high-voltage and medium-to-low-voltage motor structures.

[0041] Specifically, the external power supply terminal 212 includes: interface J1, capacitor C1, capacitor C2, and capacitor CX.

[0042] The +15V power supply terminal is connected to the first terminal of capacitor C1, the +5V power supply terminal is connected to the first terminal of capacitor C2, the second terminals of capacitor C1 and C2 are connected to ground, the +310V power supply terminal is connected to the first terminal of interface J1 and the first terminal of capacitor CX, the second terminal of interface J1 is connected to the second terminal of capacitor CX and ground.

[0043] Both the external power supply terminal 212 and the external control terminal 213 use pins, which saves soldering space and reduces impedance, making them suitable for high and low voltage environments and highly adaptable.

[0044] External power terminal 212 provides stable power support for the entire system. The +310V high-voltage power supply is introduced through interface J1, filtered by capacitor CX, and then supplies power to the P pins of the half-bridge inverter modules U1, U2, and U3 in the motor drive circuit 211, ensuring the high-voltage energy required for power drive. The +15V power supply supplies power to the VCC pins of the half-bridge inverter modules U1, U2, and U3, while the +5V power supply provides low-voltage operating power to the control chip U5, etc. Capacitors C1 and C2 filter the +15V and +5V power supplies respectively to reduce the impact of power fluctuations on the circuit. The second terminal of interface J1 and the second terminal of capacitor CX are grounded together, forming a complete power supply loop.

[0045] MCU214 includes: control chip U5.

[0046] The I / O pins of the control chip U5 are connected to the external control terminal 213, the motor drive circuit 211, and the current sampling circuit.

[0047] The MCU214, with the control chip U5 at its core, serves as the control hub of the entire system. The I / O pins of the control chip U5 are connected to the external control terminal 213, the motor drive circuit 211, and the current sampling circuit, respectively. After receiving external control signals, it combines the information fed back from the current sampling circuit and generates corresponding control commands through its built-in algorithm. These commands are then sent to the motor drive circuit 211 in the form of electrical signals, enabling precise control of the motor's operating status. Simultaneously, it can process various feedback signals to ensure the system operates stably according to preset logic.

[0048] The motor drive circuit 211 includes: half-bridge inverter module U1, half-bridge inverter module U2, half-bridge inverter module U3, capacitor C16, resistor R8, resistor R9, resistor R16, capacitor C9, capacitor C18, resistor R11, resistor R12, capacitor C20, resistor R15, and resistor R14.

[0049] The +15V power supply terminal is connected to the VCC pin of half-bridge inverter module U1, the VCC pin of half-bridge inverter module U2, and the VCC pin of half-bridge inverter module U3. The GND pins of half-bridge inverter modules U1, U2, and U3 are connected to ground. The VB pin of half-bridge inverter module U1 is connected to the first terminal of capacitor C16, and the second terminal of capacitor C16 is connected to the U-phase output terminal. The VB pin of half-bridge inverter module U2 is connected to the first terminal of capacitor C18, and the second terminal of capacitor C18 is connected to the V-phase output terminal. The VB pin of half-bridge inverter module U3 is connected to the first terminal of capacitor C20, and the second terminal of capacitor C20 is connected to the W-phase output terminal. The HIN pin of half-bridge inverter module U1 is connected to control chip U5 through resistor R8. The LIN pin of U1 is connected to the control chip U5 through resistor R9. The HIN pin of the half-bridge inverter module U2 is connected to the control chip U5 through resistor R11. The LIN pin of the half-bridge inverter module U2 is connected to the control chip U5 through resistor R12. The HIN pin of the half-bridge inverter module U3 is connected to the control chip U5 through resistor R15. The LIN pin of the half-bridge inverter module U3 is connected to the control chip U5 through resistor R14. The P pins of the half-bridge inverter modules U1, U2, and U3 are connected to the +310V power supply. The VOT pin of the half-bridge inverter module U1 is connected to the first end of resistor R16. The second end of resistor R16 is connected to the first end of capacitor C9, the VOT pin of the half-bridge inverter module U2, and the VOT pin of the half-bridge inverter module U3. The second end of capacitor C9 is connected to ground.

[0050] The motor drive circuit 211 is a key component for power conversion. Half-bridge inverter modules U1, U2, and U3 correspond to the U, V, and W phases of the motor, respectively. The HIN and LIN signals sent by control chip U5 are transmitted to each chip via resistors, controlling the on / off state of internal power devices and converting DC power into three-phase AC power. Capacitors C16, C18, and C20 stabilize the voltage, while resistors R8 and R9 provide current-limiting protection for the signals. Finally, the drive current is provided to the motor through the U, V, and W phase output terminals.

[0051] The current sampling circuit includes: resistor S3, resistor R37, resistor R35, and capacitor C35.

[0052] The first terminal of resistor RS3 is connected to the first terminal of resistor R37, the N pin of half-bridge inverter module U1, the N pin of half-bridge inverter module U2, and the N pin of half-bridge inverter module U3. The second terminal of resistor RS3 is connected to the first terminal of resistor R35 and ground. The second terminal of resistor R37 is connected to the first terminal of capacitor C35 and the OPA1_IN+ pin of control chip U5. The second terminal of resistor R35 is connected to the second terminal of capacitor C35 and the OPA1_IN- pin of control chip U5.

[0053] The current sampling circuit is responsible for monitoring the current information of the motor in real time. Resistor RS3 is connected in series in the main circuit. When current passes through it, a voltage drop will be generated. This voltage signal is divided by resistors R37 and R35 and filtered by capacitor C35. It is then input to the OPA1_IN+ and OPA1_IN- pins of the control chip U5, respectively. The control chip calculates the actual current value based on these signals, which serves as the basis for adjusting the control strategy, realizing closed-loop control of the motor current and ensuring the safe and stable operation of the motor.

[0054] The external control terminal 213 includes: a serial communication circuit, a filter circuit, and an interface J3.

[0055] The first end of interface J3 is connected to the U-phase output terminal, the second end of interface J3 is connected to the V-phase output terminal, the third end of interface J3 is connected to the W-phase output terminal, and the serial communication circuit, the filtering circuit, and the control chip U5 are connected.

[0056] External control terminal 213 serves as the interface for system interaction with external systems. Interface J3 connects to the three-phase windings of the motor to transmit drive signals. The serial communication circuit connects to external devices via interface J2. Resistors R17 and R18 limit and protect the signal transmission, enabling control chip U5 to receive external control commands and exchange debugging information. The filtering circuit divides and filters the +310V power supply voltage, transmitting the processed signal to control chip U5 for power supply voltage monitoring and protection.

[0057] The serial communication circuit includes: interface J2, resistor R17, and circuit group R18.

[0058] The first terminal of interface J2 is connected to ground, the second terminal of interface J2 is connected to the +5V power supply terminal, the third terminal of interface J2 is connected to the first terminal of resistor R18, the second terminal of resistor R18 is connected to the SWK pin of control chip U5, the fourth terminal of interface J2 is connected to the first terminal of resistor R17, the second terminal of resistor R17 is connected to the SWD pin of control chip U5, and the fifth terminal of interface J2 is connected to the +15V power supply terminal.

[0059] The filter circuit includes: capacitor C3, resistor R6, resistor R5, resistor R4, and resistor R3.

[0060] The +310V power supply terminal is connected to the first end of resistor R3. The second end of resistor R3 is connected to the first end of resistor R4. The second end of resistor R4 is connected to the first end of resistor R6 and the first end of capacitor R5. The second end of resistor R5 is connected to the first end of capacitor C3 and ground. The second end of capacitor C3 is connected to the second end of resistor R6 and the VDC pin of control chip U5.

[0061] The half-bridge inverter modules U1, U2, and U3 are all TSM450F, and their circuit connections are symmetrical. They receive control signals from chip U5 and work together to drive the U, V, and W phases of the motor.

[0062] External control terminal 213 serves as the interface for system interaction with external systems. Interface J3 connects to the three-phase windings of the motor to transmit drive signals. The serial communication circuit connects to external devices via interface J2. Resistors R17 and R18 limit and protect the signal transmission, enabling control chip U5 to receive external control commands and exchange debugging information. The filtering circuit divides and filters the +310V power supply voltage, transmitting the processed signal to control chip U5 for power supply voltage monitoring and protection.

[0063] After the system is powered on, the external power supply terminals provide a stable operating voltage to each module. The external control terminals receive external control commands and transmit them to the MCU214. The MCU214 generates corresponding control signals based on the commands and the current information fed back by the current sampling circuit, and sends them to the motor drive circuit 211. The motor drive circuit 211 inverts the DC power into three-phase AC power, which drives the brushless motor to run through the phase line interface terminals. At the same time, the current sampling circuit continuously monitors the current and feeds it back to the MCU214. The MCU214 adjusts the control signals in real time based on the feedback to ensure that the motor runs stably according to the set state. All modules work together to form a complete closed-loop control system.

[0064] The half-bridge inverter module 2111 is packaged in either PQFN (Power Quad Flat No-lead) or QFN (Quad Flat No-lead) form, which has the advantages of small size and good heat dissipation.

[0065] Furthermore, the underlying circuit layout also includes a phase line output terminal 20 connected to the motor drive circuit 211. The phase line output terminal 20 is located in the center of the underlying circuit layout. This arrangement makes the phase line connection of the high-speed motor simpler, reduces the parasitic inductance of the phase line, and reduces the influence of conducted radiation.

[0066] like Figure 3 As shown, in this embodiment, the underlying circuit layout includes three phase line output terminals 20, namely U, V and W in the figure, which are connected one-to-one with the half-bridge inverter modules U1, U2 and U3 in the motor drive circuit 211.

[0067] In this embodiment, the motor drive circuit 211 is located on the airflow channel of the air outlet, which can make full use of the airflow of the high-speed motor air outlet for heat dissipation. The airflow is used to quickly remove the heat generated by the motor drive circuit 211, thereby ensuring that the motor drive circuit 211 operates within a safe temperature range and improving its working stability and reliability.

[0068] Furthermore, in this embodiment, the MCU214 integrates operational amplifiers and comparators internally. The MCU214 samples the current signal using either a single or dual resistor to achieve sensorless FOC (Field Oriented Control) sinusoidal drive of the high-speed motor. By integrating operational amplifiers and comparators within the MCU214, the overall circuit structure of the high-speed motor becomes more compact, facilitating miniaturization. It is understood that in practical applications, a configurable current sampling module can be set in the MCU214, allowing selection of single or dual resistor sampling methods based on different application requirements. Moreover, by configuring the MCU214 with software and setting different parameters and modes, control of three-phase or single-phase motors can be achieved.

[0069] Furthermore, the motor drive board 21 is fixed to the motor outlet by welding or terminal self-locking fastening, so that the motor drive board 21 and the motor outlet form a firm connection, which can ensure the connection stability of the motor drive board 21 even when subjected to vibration and impact.

[0070] Furthermore, the diameter of the motor drive board 21 is smaller than the diameter of the motor body, which allows the motor drive board 21 to better fit the motor body, achieving an integrated design of the high-speed motor without increasing the overall volume, making the structure of the entire high-speed motor more compact.

[0071] This motor utilizes precise modular connections and coordination. External power terminals provide stable power to the half-bridge inverter module and MCU, ensuring energy supply to each module. The half-bridge inverter module receives control signals and precisely drives the three phases of the motor, achieving stable inverter control of the high-speed motor. The current sampling circuit collects the bus current in real time, providing feedback to the control algorithm and ensuring motor control accuracy. External control terminals enable independent transmission of power, control signals, and motor outputs. The filtering circuit suppresses interference and ensures circuit stability through voltage sampling and signal filtering. All modules work together to build an efficient and reliable high-speed motor drive system, meeting the requirements for precise motor control and stable operation.

[0072] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A brushless motor with an integrated motor drive control board, comprising a housing (1), characterized in that: The housing (1) is coaxially mounted with a rotating shaft (4), and a rotor (3) is fixedly sleeved on the rotating shaft (4); the housing (1) is coaxially mounted with a stator (2), and the stator (2) is sleeved on the outside of the rotor (3); A motor drive board (21) is installed inside the housing (1), and the motor drive board (21) integrates a motor drive circuit (211). The motor drive board (21) is connected within the projection line of the outer circumference of the stator (2); A plurality of stator phase line terminals (5) are fixedly provided on the stator (2), and the plurality of stator phase line terminals (5) are evenly distributed on the stator (2) along the circumference of the rotating shaft (4); The motor drive board (21) is welded to several stator phase terminals (5), and the several stator phase terminals (5) are electrically connected to the motor drive board (21).

2. The brushless motor with an integrated motor drive control board according to claim 1, characterized in that: The winding pattern on the stator (2) is either star-shaped or triangular.

3. The brushless motor with an integrated motor drive control board according to claim 2, characterized in that: The winding on the stator (2) is single-phase, and the number of stator phase terminals (5) is two.

4. The brushless motor with an integrated motor drive control board according to claim 2, characterized in that: The stator (2) has three phase windings, and the stator phase terminals (5) have three phases.

5. The brushless motor with an integrated motor drive control board according to claim 1, characterized in that: The motor drive board (21) also includes: an external power supply terminal (212), an external control terminal (213), an MCU (214), a phase line interface terminal (20), and a current sampling circuit; The external power supply terminal (212) is connected to the MCU (214) and the motor drive circuit (211), the external control terminal (213) is connected to the MCU (214) and the motor drive circuit (211), the MCU (214) is connected to the motor drive circuit (211) and the current sampling circuit, the motor drive circuit (211) is connected to the current sampling circuit, and the motor drive circuit (211) is connected to the phase line interface terminal (20).

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