Automatic frequency conversion control device for high-voltage motor

Abstract

The application discloses a kind of high-voltage motor automatic frequency conversion control device, it is related to motor control technical field.The application includes motor body, the top of motor body is provided with terminal box, and terminal box is connected with docking assembly, docking assembly top end is fixed with bottom heat dissipation piece, bottom heat dissipation piece outside is fixed with heat dissipation frame, heat dissipation frame top end is fixed with top heat dissipation piece, bottom heat dissipation piece one side is equipped with power supply assembly, and top end one side is provided with modulation board group and support frame, modulation board group adjacent side is provided with rectifier plate, top heat dissipation piece bottom is provided with inverter, support frame top end and top heat dissipation piece between fixed with output transformer group, support frame one side is provided with filter capacitor group.The application is integrated into heat dissipation frame by frequency conversion unit, and is connected with motor body, by bottom heat dissipation piece and top heat dissipation piece to each electric appliance is targeted heat dissipation, improves the accuracy of device adjustment speed and use stability.

Description

Technical Field

[0001] This invention relates to the field of motor control technology, and specifically to an automatic frequency conversion control device for a high-voltage motor. Background Technology

[0002] In chemical production processes, high-voltage motors are often used for extended periods of time, resulting in significant energy consumption. However, the speed of high-voltage motors needs to be adjusted depending on the specific process. Therefore, to make more rational use of high-voltage motors and achieve energy saving and more precise speed control, it is necessary to install appropriate frequency converters on the high-voltage motors to improve production efficiency and reduce energy consumption.

[0003] The patent specification with publication number CN113972780A discloses a variable frequency speed regulation three-phase asynchronous motor based on Internet of Things control, including a motor body. Two sets of bases are fixedly installed at the bottom of the motor body. Several sets of protective rings are arranged on the outer side of the motor body. The protective rings are circular and made of elastic material. The bottom end of the protective rings is slidably connected to the base. A card seat is fixedly installed at the top of the motor body. A slider is slidably connected to the inner side of the card seat. A buffer component is provided between the top of the slider and the protective ring. A moving groove is opened at the top of the base. A bending plate is fixedly installed at the bottom of the protective ring. The bending plate is folded. By adding several sets of protective rings, not only will the normal heat dissipation of the motor body not be affected, but the operator can also be held back if the operator bumps into the motor body, effectively preventing the operator from being burned by the motor body after accidentally falling and hitting it.

[0004] The shortcomings of this technical solution are as follows: First, this type of motor uses an external circuit for frequency conversion control, but the compatibility between this type of frequency conversion control unit and the motor itself is usually limited, resulting in poor control effect; Second, this type of motor uses a protective ring to protect the motor, but does not actively dissipate heat from the heat-generating parts, affecting the service life of the heat-generating unit. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic frequency conversion control device for high-voltage motors. The technical problem to be solved is as follows: the frequency conversion control effect of existing frequency conversion motors is poor, and they cannot actively and effectively dissipate heat from the heat-generating parts, which affects the service life of the motor.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] An automatic frequency conversion control device for a high-voltage motor includes a motor body. A junction box is installed on the top of the motor body, and a docking assembly is connected inside the junction box. A bottom heat sink is fixedly connected to the top of the docking assembly, and a heat dissipation frame is fixedly connected to the outside of the bottom heat sink. A top heat sink is fixedly connected to the top of the heat dissipation frame. The bottom heat sink, heat dissipation frame, and top heat sink are used to dissipate heat during the frequency conversion process. A power supply assembly is installed on one side of the bottom heat sink, and a modulation board assembly and a support frame are installed on one side of the top of the bottom heat sink. A rectifier board is installed on the adjacent side of the modulation board assembly. An inverter is installed on the bottom surface of the top heat sink. An output transformer assembly is fixedly connected between the top of the support frame and the top heat sink. A filter capacitor assembly is installed on one side of the support frame.

[0008] As a further aspect of the present invention: the power supply component includes a wiring frame fixedly connected to one side of the bottom heat sink, the top of the wiring frame is provided with a plurality of power terminals, each of the power terminals is used to connect an external power supply line, and the bottom of the wiring frame is equipped with a plurality of compensation capacitors.

[0009] As a further aspect of the present invention: the rectifier board is provided with a rectifier bridge circuit, the rectifier bridge circuit includes four inverter diodes, and at least two current sensors are installed on one side of the rectifier board, the current sensors being electrically connected to the modulation board assembly.

[0010] As a further aspect of the present invention: the filter capacitor bank includes at least two capacitors, both of which are electrically connected to the rectifier board.

[0011] As a further aspect of the present invention: the inverter is electrically connected to the modulation board group, the inverter includes a plurality of field-effect transistors, and each field-effect transistor is electrically connected to an on / off control board, the modulation board group includes a signal receiving board and an inverter control board, and the inverter control board is electrically connected to the on / off control board.

[0012] As a further aspect of the present invention: the output transformer group includes two insulating plates fixedly connected between the top of the support frame and the bottom of the top heat sink, a plurality of iron cores are installed between the two insulating plates, and each iron core is wound with an output coil, the output coil being electrically connected to the docking assembly.

[0013] As a further aspect of the present invention: the docking assembly includes two output terminals, the two output terminals are connected to corresponding current contacts in the junction box, and a signal access board is provided on the top of the docking assembly, the signal access board being electrically connected to the signal receiving board.

[0014] As a further aspect of the present invention: both the bottom heat sink and the top heat sink are aluminum heat sinks, and heat sink fins are arranged and fixedly connected on the surfaces that are far apart from each other. The heat sink frame has heat sink strip holes arranged on both sides, and an electrical inlet is provided on one side of the heat sink frame.

[0015] As a further embodiment of the present invention: the power supply component, modulation board group, rectifier board, and filter capacitor group are all fixedly connected to the top of the bottom heat sink, the bottom surface of the bottom heat sink is adapted to the docking component and has a slot, and the inverter and the output transformer group are fixedly connected to the bottom of the top heat sink.

[0016] The beneficial effects of this invention are:

[0017] 1. In this invention, a junction box is installed at the top of the motor body, and a heat dissipation frame is installed on the junction box. A frequency converter is installed inside the heat dissipation frame. The input power supply is rectified from AC to DC in sequence, the rectified DC power is filtered, and the filtered current is controlled to switch on and off. The stable DC power is converted to AC with an adjustable frequency, and the final amplitude is adjusted by the output transformer group before being transmitted to the motor. This achieves precise control of the motor speed. Through the high compatibility between the frequency converter and the high-voltage motor, the frequency adjustment process of the frequency converter is timely and accurate, thereby improving the accuracy of the high-voltage motor speed control and achieving effective energy saving.

[0018] 2. In this invention, by installing the bottom heat sink and the top heat sink on the top and bottom surfaces of the heat sink frame, and setting the two heat sinks as external devices, and in conjunction with the use of the heat sink holes on both sides of the heat sink frame, the high-energy-consuming frequency converter unit can be cooled in time during the frequency conversion speed regulation process of the motor, thus extending the service life of the device.

[0019] 3. In this invention, by integrating the frequency converter unit into the heat dissipation frame and connecting it to the motor body, the bottom heat dissipation component is used to dissipate heat from the power supply components, modulation board group, rectifier board, docking components and filter capacitor group, and the top heat dissipation component is used to dissipate heat from the inverter and output transformer group. This allows each electrical component of the device to receive targeted and effective heat dissipation in a reasonable spatial layout, thereby achieving precise frequency regulation and speed control of the motor body, extending its service life, and improving the accuracy of speed adjustment and the stability of use of the device. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a partial structural schematic diagram of the present invention;

[0023] Figure 3 This is a schematic diagram of the internal structure of the frequency converter unit of the present invention;

[0024] Figure 4 This is a side view of the internal structure of the frequency converter unit of the present invention;

[0025] Figure 5 This is the present invention. Figure 2 Enlarged detail view of point A in the middle;

[0026] Figure 6 This is the present invention. Figure 3 Enlarged detail view of point B in the middle;

[0027] Figure 7 This is the present invention. Figure 3 Detailed magnified view of point C;

[0028] Figure 8 This is the present invention. Figure 4 A magnified view of the details at point D.

[0029] In the diagram: 1. Motor body; 2. Junction box; 3. Connecting assembly; 31. Output terminal; 32. Signal input board; 4. Bottom heat sink; 5. Heat sink frame; 6. Top heat sink; 7. Power supply assembly; 71. Terminal block; 72. Power terminal; 73. Compensation capacitor; 8. Modulation board assembly; 81. Signal receiving board; 82. Inverter control board; 9. Rectifier board; 91. Inverter diode; 92. Current sensor; 10. Inverter; 11. Support frame; 12. Output transformer assembly; 121. Insulation board; 122. Iron core; 123. Output coil; 13. Filter capacitor assembly; 14. Heat sink fins; 15. Heat sink holes; 16. Power inlet. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figures 1 to 8As shown, a high-voltage motor automatic frequency conversion control device includes a motor body 1, a junction box 2 is provided on the top of the motor body 1, a docking component 3 is electrically connected inside the junction box 2, a bottom heat sink 4 is fixedly connected to the top of the docking component 3, a heat sink frame 5 is fixedly connected to the outside of the bottom heat sink 4, a top heat sink 6 is fixedly connected to the top of the heat sink frame 5, the bottom heat sink 4, the heat sink frame 5 and the top heat sink 6 are used to dissipate heat from the device, a power supply component 7 is installed on one side of the bottom heat sink 4, a modulation board group 8 is provided on one side of the top of the bottom heat sink 4, a rectifier board 9 is provided on the adjacent side of the modulation board group 8, an inverter 10 is provided on the bottom surface of the top heat sink 6, a support frame 11 is fixedly connected to one side of the top of the bottom heat sink 4, an output transformer group 12 is fixedly connected between the top of the support frame 11 and the top heat sink 6, and a filter capacitor group 13 is provided on one side of the support frame 11.

[0032] It should be noted that the power supply component 7, modulation board group 8, rectifier board 9, inverter 10, support frame 11, output transformer group 12 and filter capacitor group 13 together constitute the frequency conversion unit of motor body 1. The electrical components of the frequency conversion unit are electrically connected through lines (not shown), and each component is provided with a corresponding number of terminals for line connection.

[0033] like Figure 3 and Figure 6 As shown, the power supply assembly 7 includes a terminal block 71 fixedly connected to one side of the bottom heat sink 4. The upper surface of the terminal block 71 is provided with multiple power terminals 72. The power terminals 72 are used to connect external power lines. The current input from the external power lines is connected to the terminal blocks at the location of each power unit through internal reconnection lines to supply power to each power unit. Preferably, multiple compensation capacitors 73 are installed at the bottom of the terminal block 71 to improve the power stability of the frequency converter unit.

[0034] like Figure 4 and Figure 8As shown, the power supply needs to be rectified before being delivered to each power-consuming unit. After the external power supply is input through the power supply component 7, it first enters the rectifier board 9. The rectifier board 9 is equipped with a rectifier bridge circuit, which is composed of four inverter diodes 91 connected in series and parallel. Specifically, it includes two forward-biased diodes and two reverse-biased diodes. When the output signal is the positive half-cycle of AC, the forward-biased diodes are turned on and the reverse-biased diodes are turned off. At this time, the output terminal of the rectifier bridge is positive. When the input signal is the negative half-cycle, the reverse-biased diodes are turned on and the reverse-biased diodes are turned off. When the bias diode is cut off, the output terminal of the rectifier bridge is still positive, thus realizing the rectification of DC signal and completing the conversion of AC to DC. Two current sensors 92 are installed on one side of the rectifier board 9 to monitor the DC output of the rectifier bridge circuit in real time. They have built-in Hall effect devices to convert DC signals into voltage signals for reception by the modulation board group 8. The received signals are used to monitor the power consumption of the motor in real time to understand the motor's operating status and load. At the same time, through further regulation by the modulation board group 8, the speed and torque of the motor can be accurately adjusted.

[0035] The DC power rectified by the rectifier bridge circuit is pulsed DC power, which needs to be filtered to make it more stable during use. The pulse current is filtered after passing through the filter capacitor group 13 on one side. Specifically, the filter capacitor group 13 includes two capacitors, which are connected in series in the output circuit to bypass the load of the high-frequency signal, thereby reducing the transmission of high-frequency components, reducing the high-frequency pulsation of the output voltage and current, and improving the smoothness of the output waveform.

[0036] like Figure 2 and Figure 6 As shown, the inverter 10 is electrically connected to the modulation board group 8. The inverter 10 includes field-effect transistors (FETs) and a switching control board electrically connected to each FET. The FETs are specifically MOSFET semiconductor transistors used to control the switching of the filtered DC current, thereby realizing the output of adjustable frequency AC power. The modulation board group 8 includes a signal receiving board 81 and an inverter control board 82. The signal receiving board 81 is used to receive electrical signals for controlling the motor's operating status, and the inverter control board 82 is electrically connected to the switching control board of the inverter 10. After receiving the electrical signals for motor status control, the modulation board group 8 controls the operating status of the switching control board through the inverter control board 82.

[0037] Based on the speed value set by the control electrical signal, the inverter control board 82 generates corresponding pulse width modulation signals. These pulse width modulation signals are transmitted to the on / off control board and processed into on / off control signals, which are then transmitted to the various field-effect transistors (FETs) of the inverter 10. Under the control of the on / off control signals, the FETs regulate their switching state and switching frequency, thereby achieving frequency regulation of the output voltage and output current. The adjusted adjustable frequency AC power is transmitted to the high-voltage motor by the docking component 3, thereby achieving regulation of the motor's operating speed and torque. Specifically, when the pulse width modulation signal is high, the FETs are off, and the inverter 10 output voltage is 0V. When the pulse width modulation signal is low, the FETs are on, and the inverter 10 output voltage is at its normal value.

[0038] like Figure 3 and Figure 7 As shown, after the DC power is converted to AC power by the inverter 10, this AC power needs to be output to the motor. Before the final output, the amplitude and phase of the output current and voltage need to be adjusted to adapt to the rated voltage and working requirements of the motor. The output transformer group 12 undertakes this function. Specifically, the output transformer group 12 includes two insulating plates 121 fixedly connected between the top of the support frame 11 and the bottom of the top heat sink 6. Three iron cores 122 are installed between the two insulating plates 121. Each iron core 122 is wound with an output coil 123, which is electrically connected to the docking assembly 3.

[0039] Specifically, the two insulating plates 121 are used to provide electrical insulation, while the iron core 122 and the output coil 123 are used to adjust the amplitude and phase of the output voltage. Since the two insulating plates 121 are connected to the top heat sink 6 and are in a suspended state respectively, the output transformer group 12 can be effectively cooled, thus extending the service life of the transformer group.

[0040] like Figure 2 and Figure 5 As shown, the final amplitude-modulated current is connected to the motor through the docking assembly 3. The docking assembly 3 includes two output terminals 31, which are connected to the corresponding current contacts in the junction box 2 at the top of the motor. A signal access board 32 is provided on the top of the docking assembly 3. The signal access board 32 is used to transmit the control signal for adjusting the speed of the motor to the signal receiving board 81 of the modulation board group 8. That is, the signal access board 32 is electrically connected to the modulation board group 8.

[0041] As can be seen from the above, after receiving the control signal from the motor, the frequency converter unit rectifies the input power supply from AC to DC, then filters the rectified DC power, and then controls the on / off state of the filtered current. This process converts the stable DC power into AC power with an adjustable frequency, and the conversion process is regulated by the inverter 10. Before being transmitted to the motor, the output transformer group 12 performs final amplitude modulation to achieve precise control of the motor speed. Due to the high compatibility between the frequency converter unit and the high-voltage motor, the frequency adjustment process of the frequency converter unit is timely and accurate, thereby improving the accuracy of high-voltage motor speed control, achieving effective energy saving, and avoiding excessive use of ineffective power.

[0042] like Figures 1 to 3 As shown, the main body of both the bottom heat sink 4 and the top heat sink 6 is an aluminum heat sink plate. Heat sink fins 14 are fixedly connected to the outer side of the aluminum heat sink plate. The bottom heat sink 4 and the top heat sink 6 are fixedly connected to the outer side of the adjacent side of the heat sink frame 5, so as to maximize the timely heat dissipation of the frequency converter unit. The heat sink frame 5 has heat dissipation strip holes 15 on both sides to enhance the heat dissipation effect of the frequency converter unit. Specifically, a power inlet 16 is provided on one side of the heat sink frame 5. The power inlet 16 is used to place the power supply component 7 on the outer side, so as to facilitate the external power supply to the motor.

[0043] Specifically, the modulation board group 8, rectifier board 9, power supply component 7, and filter capacitor group 13 are all fixedly connected to the top of the bottom heat sink 4, and the bottom of the bottom heat sink 4 is adapted to have a slot for the installation of the docking component 3, thereby realizing the cooling and heat dissipation of this part of the electrical components by the bottom heat sink 4. The inverter 10 and output transformer group 12 are fixedly connected to the bottom of the top heat sink 6, thereby realizing the timely heat dissipation of this part of the electrical components by the top heat sink 6. By organically arranging the various electrical components of the frequency converter unit inside the heat dissipation frame 5 and connecting them to the top heat sink 6 and the bottom heat sink 4 respectively, reasonable and efficient heat dissipation of the frequency converter unit is achieved, thereby extending the service life of the motor frequency converter unit.

[0044] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A high-voltage motor automatic frequency conversion control device, comprising a motor body (1), characterized in that, The motor body (1) is provided with a junction box (2) on the top. A docking component (3) is connected inside the junction box (2). A bottom heat sink (4) is fixedly connected to the top of the docking component (3). A heat sink frame (5) is fixedly connected to the outside of the bottom heat sink (4). A top heat sink (6) is fixedly connected to the top of the heat sink frame (5). The bottom heat sink (4), the heat sink frame (5) and the top heat sink (6) are used to dissipate heat during the frequency conversion process. A power supply component (7) is installed on one side of the bottom heat sink (4), and a modulation board group (8) and a support frame (11) are provided on one side of the top. A rectifier board (9) is provided on the adjacent side of the modulation board group (8). An inverter (10) is provided on the bottom surface of the top heat sink (6). An output transformer group (12) is fixedly connected between the top of the support frame (11) and the top heat sink (6). A filter capacitor group (13) is provided on one side of the support frame (11). Both the bottom heat sink (4) and the top heat sink (6) are aluminum heat sinks, and heat sink fins (14) are arranged and fixedly connected on the surfaces that are far apart from each other. Heat sink frame (5) has heat sink holes (15) arranged on both sides. A power inlet (16) is provided on one side of the heat sink frame (5). The power supply component (7), modulation board group (8), rectifier board (9), and filter capacitor group (13) are all fixedly connected to the top of the bottom heat sink (4). The bottom surface of the bottom heat sink (4) is adapted to the docking component (3) and has a slot. The inverter (10) and the output transformer group (12) are fixedly connected to the bottom of the top heat sink (6).

2. The high-voltage motor automatic frequency conversion control device according to claim 1, characterized in that, The power supply component (7) includes a wiring frame (71) fixedly connected to one side of the bottom heat sink (4). The top of the wiring frame (71) is provided with several power terminals (72), each of which is used to connect an external power supply line. The bottom of the wiring frame (71) is equipped with several compensation capacitors (73).

3. The high-voltage motor automatic frequency conversion control device according to claim 1, characterized in that, The rectifier board (9) is provided with a rectifier bridge circuit, which includes four inverter diodes (91). At least two current sensors (92) are installed on one side of the rectifier board (9), and the current sensors (92) are electrically connected to the modulation board group (8).

4. The high-voltage motor automatic frequency conversion control device according to claim 1, characterized in that, The filter capacitor bank (13) includes at least two capacitors, both of which are electrically connected to the rectifier plate (9).

5. The high-voltage motor automatic frequency conversion control device according to claim 1, characterized in that, The inverter (10) is electrically connected to the modulation board group (8). The inverter (10) includes a plurality of field-effect transistors. Each field-effect transistor is electrically connected to an on / off control board. The modulation board group (8) includes a signal receiving board (81) and an inverter control board (82). The inverter control board (82) is electrically connected to the on / off control board.

6. The high-voltage motor automatic frequency conversion control device according to claim 5, characterized in that, The output transformer group (12) includes two insulating plates (121) fixedly connected between the top of the support frame (11) and the bottom of the top heat sink (6). A plurality of iron cores (122) are installed between the two insulating plates (121). Each iron core (122) is wound with an output coil (123). The output coil (123) is electrically connected to the docking assembly (3).

7. The high-voltage motor automatic frequency conversion control device according to claim 5, characterized in that, The docking assembly (3) includes two output terminals (31), which are connected to corresponding current contacts in the junction box (2). A signal access board (32) is provided on the top of the docking assembly (3), which is electrically connected to the signal receiving board (81).

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