CN215956289U - Driving device and driving motor system - Google Patents
Driving device and driving motor system Download PDFInfo
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- CN215956289U CN215956289U CN202120790031.7U CN202120790031U CN215956289U CN 215956289 U CN215956289 U CN 215956289U CN 202120790031 U CN202120790031 U CN 202120790031U CN 215956289 U CN215956289 U CN 215956289U
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Abstract
The utility model provides a driving device and a driving motor system, wherein the driving device comprises a main circuit board and an inversion unit, a direct current bus and n output leads are integrated on the main circuit board, the inversion unit comprises n bridge arms, the input end of each bridge arm is electrically connected with the direct current bus, the output ends of the n bridge arms are respectively electrically connected with the n output leads, n is an integer greater than or equal to 2, the driving device also comprises a filtering unit, and the filtering unit comprises a planar patch magnetic core fixed on the surface of the main circuit board; at least one part of the output lead is positioned in the orthographic projection area of the planar patch magnetic core on the main circuit board, and the output lead and the planar patch magnetic core jointly form a filter inductor of the filter unit. The driving device can inhibit negative effects such as shaft voltage, bearing current and leakage current caused by common mode and differential mode voltage, is favorable for improving the integration degree of the driving device and reducing the volume of the driving device.
Description
Technical Field
The utility model relates to the field of power electronic driving systems, in particular to a driving device and a driving motor system.
Background
With the rapid development of modern power electronic technology, power devices with high switching frequency, such as IGBTs (Insulated Gate Bipolar transistors), SiC (silicon carbide), GaN (gallium nitride), etc., are continuously present, wherein the switching frequency of the IGBTs can reach 120KHz, and the switching frequency of the SiC and GaN can reach more 20 MHz. On the other hand, thanks to the power device with high switching frequency, the industrial automation technology is rapidly developed, and smaller and more cost-advantageous servo systems of inverters using PWM (Pulse Width Modulation) are becoming more and more popular.
The improvement of the switching frequency and the reduction of the rise time of the voltage pulse improve the performance of the PWM inverter and reduce the loss of the inverter, but also bring some negative effects, which are specifically shown as follows: a larger dv/dt (rate of change of voltage) and a higher voltage peak. When connected to the motor via long cables, higher voltage spikes are reflected at the motor end, which can damage the motor insulation.
Meanwhile, as shown in fig. 1, the excessive dv/dt generates a high-frequency common mode current 11 through the distributed capacitance to ground, which causes electromagnetic interference (EMI) and affects the normal operation of other electrical devices in the system. The common mode current 11 is also a ground leakage current, which may cause an overcurrent fault in the servo driver. In addition, the common mode voltage and the differential mode voltage with high dv/dt can also greatly increase the stress borne by the motor, so that the insulation failure of the coil is caused; the high dv/dt common mode voltage can cause damage to the bearing due to the shaft voltage and the bearing current generated by the coupling capacitor between the stator and the rotor, and the service life of the motor is reduced.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a driving device and a driving motor system aiming at the problem that high-frequency common-mode current generated by a high-switching-frequency power device can cause electromagnetic interference and can cause overcurrent fault in starting of a servo driver.
The embodiment of the present invention provides a driving device, including a main circuit board and an inverter unit, where the main circuit board is integrated with a dc bus and n output wires, the inverter unit includes n bridge arms, an input end of each bridge arm is electrically connected to the dc bus, output ends of the n bridge arms are respectively electrically connected to the n output wires, n is an integer greater than or equal to 2, the driving device further includes a filter unit, and the filter unit includes a planar patch core fixed on a surface of the main circuit board;
at least one part of the output lead is positioned in the orthographic projection area of the planar patch magnetic core on the main circuit board, and the output lead and the planar patch magnetic core jointly form a filter inductor of the filter unit.
As a further improvement of the present invention, the filtering unit includes n filtering branches, and the n filtering branches are electrically connected to the output ends of the n bridge arms respectively;
each filtering branch comprises a filtering capacitor, each output lead is electrically connected with a preset potential point through the filtering capacitor, and the output end of the driving device is electrically connected with the connection points of the n output leads and the corresponding filtering capacitors respectively.
As a further improvement of the present invention, the portion of the output wire in the orthographic projection area of the planar patch core extends perpendicular to the magnetic field direction of the planar patch core.
As a further improvement of the utility model, the n filter branches share the same planar patch magnetic core.
As a further improvement of the present invention, each of the filtering branches includes a damping resistor, and in the filtering branch, the filtering capacitor is electrically connected to the predetermined potential point through the damping resistor.
As a further improvement of the present invention, the driving device includes an extension circuit board, the filter capacitors and the damping resistors of the n filter branches are respectively welded to the extension circuit board, the extension circuit board is inserted or welded to the main circuit board, and the filter capacitors and the damping resistors are respectively connected to the n filter branches.
As a further improvement of the present invention, the inverter unit includes three bridge arms, and the voltage at the preset potential point is the intermediate voltage of the dc bus.
As a further improvement of the present invention, the dc bus includes a first capacitor and a second capacitor having the same capacitance value, the first capacitor and the second capacitor are connected in series between the positive dc bus and the negative dc bus, and the predetermined potential point is electrically connected to a connection point of the first capacitor and the second capacitor.
As a further improvement of the present invention, the inverter unit includes two bridge arms, and the voltage at the preset potential point is the voltage of the negative dc bus.
The embodiment of the utility model also provides a driving motor system which comprises a motor and the driving device, wherein the output end of the driving device is electrically connected with the alternating-current voltage input end of the motor.
The driving device and the driving motor system of the embodiment of the utility model have the following beneficial effects: the filtering unit is additionally arranged at the output end of the inversion unit, and the output lead of the inversion unit and the planar patch magnetic core jointly form a filtering inductor, so that negative effects such as shaft voltage, bearing current, leakage current and the like caused by common mode and differential mode voltage can be inhibited, and compared with the traditional wound inductor, the integration degree of the driving device can be greatly improved, and the volume of the driving device is reduced.
Drawings
FIG. 1 is a schematic diagram of high frequency common mode currents in a prior art motor drive;
fig. 2 is a schematic circuit topology diagram of a driving apparatus according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a main circuit board and a planar patch core in a driving apparatus provided in an embodiment of the utility model;
fig. 4 is a schematic diagram of an expansion circuit board in the driving device according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Fig. 2-3 are schematic circuit topology diagrams of a driving apparatus according to an embodiment of the present invention, which can be applied to a driving motor system and control the operation of a motor. The driving device of the present embodiment includes a main circuit board 20 and an inverter unit 21, wherein the main circuit board 20 is integrated with a dc bus and three output wires. The main Circuit Board 20 in this embodiment is specifically a Printed Circuit Board (PCB), and the output wires may be formed of copper foil on the main Circuit Board 20.
The inverter unit 21 may convert a dc voltage of the dc bus into an ac voltage, and drive the motor to operate at a predetermined rotational speed and angle. The inverter unit 21 in this embodiment includes three bridge arms 211, 212, and 213, an input end of each of the bridge arms is electrically connected to the dc bus, and output ends of the three bridge arms 211, 212, and 213 are electrically connected to the three output wires, respectively. Specifically, each bridge arm comprises an upper bridge switching tube and a lower bridge switching tube, and the connection point of the upper bridge switching tube and the lower bridge switching tube forms the output end of the bridge arm. In practical applications, the number of the output wires and the number of the bridge arms in the inverter unit 21 may be adjusted according to different motors, for example, for a driving device for driving a single-phase motor to operate, the driving device may include two output wires, and the inverter unit 21 may include two bridge arms; for a three-phase four-leg drive, the inverter unit 22 includes four legs.
The driving device in this embodiment further includes a filter unit 22, the filter unit 22 includes a planar patch core 221, and the planar patch core 221 is fixed on the surface of the main circuit board 20. Specifically, the planar patch magnetic core 221 includes a flat magnetic core main body and core legs 2212 located at two side edges of the magnetic core main body 2211, when the planar patch magnetic core 221 is fixed on the surface of the main circuit board 20, the two core legs 2212 are attached to the surface of the main circuit board 20, and the magnetic core main body 2211 has a gap with the surface of the main circuit board 20.
At least a part of the output conductor is located in the area of the planar patch core 221, which is orthographically projected from the main circuit board 20, and forms a filter inductance L0 in the filter unit 22 together with the planar patch core 221.
In the driving device, the filter unit 22 is additionally arranged at the output end of the inverter unit 21, and the output lead of the inverter unit 21 and the planar patch magnetic core 221 jointly form a filter inductor, so that negative effects such as shaft voltage, bearing current, leakage current and the like caused by common-mode and differential-mode voltages can be inhibited, a long-wire cable is allowed to be used for connecting the PWM inverter and the motor end, overvoltage at the motor end can be eliminated by changing parameters of the filter unit, and the service life of the motor is prolonged. Compared with the traditional winding type inductor, the structure can greatly improve the integration degree of the driving device and reduce the volume of the driving device.
In one embodiment of the present invention, to increase the inductance of the filter inductor, the output wires run perpendicular to the magnetic field direction of the planar patch core 221 in the orthographic projection area of the planar patch core 221 on the main circuit board 20. Of course, in practical applications, the output lead can also be adjusted according to the wiring and component distribution of the main circuit board 20.
In an embodiment of the utility model, the filtering unit 22 of the driving apparatus includes three filtering branches, and the three filtering branches are electrically connected to output ends of three arms 211, 212, and 213 of the inverter unit 21, respectively. In practical applications, the number of filter branches in the filter unit 22 corresponds to the number of legs of the inverter unit 21.
Each filter branch comprises a filter capacitor C0, each output lead connected to the output end of the bridge arm of the inverter unit 21 is electrically connected to a preset potential point through a filter capacitor C0, that is, in each filter branch, an LC filter circuit is formed by a filter inductor L0 and a filter capacitor C0, wherein the filter inductor L0 is formed by the output lead and the planar patch magnetic core 221. And the output end of the driving device is electrically connected with the connection points of the three output leads and the corresponding filter capacitor C0, namely the connection points of the filter inductor L0 and the filter capacitor C0 in the three filter branches form the output end of the driving device.
Moreover, to save the area of the main circuit board 20, the three filter branches may share the same planar patch core 221. Namely, the output wires electrically connected to the three arms of the inverter unit 21 are located in the orthographic projection area of the planar patch magnetic core 221 on the main circuit board 20. Certainly, in practical applications, one planar patch core 221 may be disposed for each output lead electrically connected to the bridge arm of the inverter unit 21, but this will increase the number of the planar patch cores 221 and occupy the area of the main circuit board 20, which is not favorable for improving the integration degree of the driving device.
In an embodiment of the utility model, the filter unit 22 further includes a damping resistor R0 in each filter branch in addition to the filter capacitor C0, and the filter capacitor C0 is electrically connected to the predetermined potential point via the damping resistor R0 in each filter branch to suppress the LC resonance peak. In each filtering branch, a filtering inductor, a filtering capacitor and a damping resistor are connected in series in sequence to form an LRC filtering circuit.
As shown in fig. 4, in order to further improve the integration degree of the driving apparatus, the driving apparatus further includes an extension circuit board 222, the filter capacitor C0 and the damping resistor R0 of each filter branch are respectively soldered to the extension circuit board 222, the extension circuit board 222 is plugged or soldered to the main circuit board 20, the filter capacitor C0 and the damping resistor R0 are respectively connected to each filter branch, and form an LRC filter circuit with the corresponding filter inductor L0, for example, three pins U, V, W of the extension circuit board 222 are respectively electrically connected to three output wires, and pin N is electrically connected to a predetermined potential point. That is, all the damping resistors R0 and the filter capacitor C0 are integrated on the extension circuit board 222, so that all the damping resistors R0 and the filter capacitor C0 can be placed inside the driving device.
When the driving circuit is used to drive a three-phase motor, the inverter unit 21 includes three bridge arms, and the voltage at the preset potential point is the intermediate voltage of the dc bus, that is, the intermediate voltage of the positive dc bus and the negative dc bus. For example, when the voltage of the positive DC bus is V1Negative DC bus voltage is V2When the voltage of the preset potential point is (V)1+V2)/2。
In particular, as shown in fig. 2, the dc bus may include a first capacitor C1 and a second capacitor C2 having the same capacitance value, the first capacitor C1 and the second capacitor C2 are connected in series between the positive dc bus and the negative dc bus, and the predetermined potential point is electrically connected to a connection point of the first capacitor C1 and the second capacitor C2.
When the driving circuit is used to drive a single-phase motor, the inverter unit 21 includes two bridge arms, and the voltage of the preset potential point is the voltage of the negative dc bus.
The embodiment of the utility model also provides a driving motor system, which can be a power system in alternating-current power supply automatic production equipment (such as an automatic machine tool) and can also be a power system in a direct-current power supply electric automobile and the like. The driving motor system of the embodiment comprises a motor and the driving device, wherein the output end of the inverter unit is electrically connected with the alternating current input end of the motor, so that the motor is controlled to operate through the driving device.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A driving device comprises a main circuit board and an inversion unit, wherein a direct current bus and n output leads are integrated on the main circuit board, the inversion unit comprises n bridge arms, the input end of each bridge arm is electrically connected with the direct current bus, the output ends of the n bridge arms are respectively electrically connected with the n output leads, and n is an integer greater than or equal to 2;
at least one part of the output lead is positioned in the orthographic projection area of the planar patch magnetic core on the main circuit board, and the output lead and the planar patch magnetic core jointly form a filter inductor of the filter unit.
2. The driving apparatus according to claim 1, wherein the filtering unit includes n filtering branches, and the n filtering branches are electrically connected to the output ends of the n bridge arms respectively;
each filtering branch comprises a filtering capacitor, each output lead is electrically connected with a preset potential point through the filtering capacitor, and the output end of the driving device is electrically connected with the connection points of the n output leads and the corresponding filtering capacitors respectively.
3. The driving device according to claim 2, wherein the portion of the output conductor within the orthographic projection area of the planar patch core runs perpendicular to the magnetic field direction of the planar patch core.
4. The driving apparatus as claimed in claim 2, wherein the n filter branches share a same planar patch core.
5. The driving apparatus as claimed in any one of claims 2-4, wherein each of said filtering branches comprises a damping resistor, and said filtering capacitor is electrically connected to said predetermined potential point via said damping resistor in said filtering branch.
6. The driving device according to claim 5, wherein the driving device comprises an extension circuit board, the filter capacitors and the damping resistors of the n filter branches are respectively soldered to the extension circuit board, and the extension circuit board is plugged or soldered to the main circuit board and connects the filter capacitors and the damping resistors into the n filter branches respectively.
7. The driving apparatus as claimed in claim 5, wherein the inverter unit comprises three bridge arms, and the voltage at the predetermined potential point is an intermediate voltage of the DC bus.
8. The driving apparatus as claimed in claim 7, wherein the dc bus comprises a first capacitor and a second capacitor having the same capacitance value, the first capacitor and the second capacitor are connected in series between the positive dc bus and the negative dc bus, and the predetermined potential point is electrically connected to a connection point of the first capacitor and the second capacitor.
9. The driving device as claimed in claim 5, wherein the inverter unit comprises two bridge arms, and the voltage of the predetermined potential point is the voltage of a negative DC bus.
10. A drive motor system comprising a motor and a drive device according to any of claims 1-9, the output of the drive device being electrically connected to the ac voltage input of the motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120790031.7U CN215956289U (en) | 2021-04-16 | 2021-04-16 | Driving device and driving motor system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120790031.7U CN215956289U (en) | 2021-04-16 | 2021-04-16 | Driving device and driving motor system |
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| Publication Number | Publication Date |
|---|---|
| CN215956289U true CN215956289U (en) | 2022-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120790031.7U Active CN215956289U (en) | 2021-04-16 | 2021-04-16 | Driving device and driving motor system |
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| CN (1) | CN215956289U (en) |
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- 2021-04-16 CN CN202120790031.7U patent/CN215956289U/en active Active
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