Motor control system and air compressor

Abstract

The utility model provides a motor control system and an air compressor, and the motor control system comprises a pre-stage power module, an isolation coupling module, a first isolation power module, a second isolation power module, a main control module, a non-isolation communication module, an isolation communication module, a first driving module and a second driving module. The pre-stage power supply module, the first isolation power supply module and the second isolation power supply module are isolated through the isolation coupling module, the non-isolation communication module and the main control module are respectively connected with the first isolation power supply module, and the isolation communication module is connected with the first isolation power supply module through a first side thereof and connected with the second isolation power supply module through a second side thereof. The main control module controls the first driving module through the non-isolated communication module in a communication mode and controls the second driving module through the isolated communication module in a communication mode, so that independent and isolated driving of different brushless motors is achieved, and the working efficiency of the air compressor can be improved.

Description

Technical Field

[0001] This application relates to the field of power tool technology, specifically to a motor control system and an air compressor. Background Technology

[0002] Most air compressors currently use brushed motors for drive, employing multiple brushed motors for multi-head control. However, the brushes in brushed motors are prone to wear and tear, have a short lifespan, and require periodic replacement. Furthermore, because the brushes contact the rotor, electrical sparks are generated, affecting not only the lifespan and operating efficiency of the brushed motor but also causing electromagnetic interference that can impact the control system and other electronic equipment. Therefore, multi-head brushed air compressors generally have lower operating efficiency, and due to the numerous factors involved, the drive design is complex, making it difficult to isolate and drive multiple different motors. Utility Model Content

[0003] In view of this, this application provides a motor control system and an air compressor that can isolate the driving of multiple different motors and improve the working efficiency of the air compressor.

[0004] The first aspect of this application provides a motor control system connected to a motor assembly, the motor assembly including a brushless motor. The motor control system includes: a front-end power supply module, an isolation coupling module, a first isolation power supply module, a second isolation power supply module, a main control module, a non-isolated communication module, an isolated communication module, a first drive module, and a second drive module. The system comprises a front-end power supply module, a first drive module, and a second drive module, all connected to and powered by an AC power source. The front-end power supply module, the first isolated power supply module, and the second isolated power supply module are connected to an isolation coupling module, which provides electrical isolation. A non-isolated communication module and a main control module are connected to and powered by the first isolated power supply module. The first and second sides of the isolation communication module are electrically isolated, with the first side connected to the first isolated power supply module and the second side connected to the second isolated power supply module, thus providing isolated power supply from both modules. The main control module communicates with the first drive module via the non-isolated communication module and with the second drive module via the isolated communication module. The first and second drive modules are connected to different brushless motors, and the main control module controls both modules, enabling them to independently drive different brushless motors.

[0005] In one embodiment, the non-isolated communication module includes a first communication chip, a first peripheral control circuit, and a first peripheral communication circuit. The first communication chip is connected to a main control module and a first drive module via the first peripheral control circuit. The isolated communication module includes a second communication chip, a second peripheral control circuit, and a second peripheral communication circuit. The control-side pins of the second communication chip are connected to the main control module via the second peripheral control circuit, and the communication-side pins of the second communication chip are connected to the second drive module via the second peripheral communication circuit. Both the first peripheral control circuit and the first peripheral communication circuit are connected to and powered by a first isolated power supply module. The control-side pins of the second communication chip and the second peripheral control circuit are both connected to and powered by the first isolated power supply module. The control-side pins of the second communication chip and the second peripheral control circuit constitute a first side of the isolated communication module. The communication-side pins of the second communication chip and the second peripheral communication circuit are both connected to and powered by the second isolated power supply module. The communication-side pins of the second communication chip and the second peripheral communication circuit constitute a second side of the isolated communication module.

[0006] In one embodiment, the first isolated power module, the second isolated power module, and the front-end power module are not grounded; the first isolated power module shares a ground with the non-isolated communication module, the first side of the isolated communication module, and the first drive module; and the second isolated power module shares a ground with the second side of the isolated communication module and the second drive module.

[0007] In one embodiment, the isolation coupling module includes a transformer, the primary winding of which is connected to a preceding power supply module, the secondary winding of which is connected to a first isolation power supply module, and the auxiliary winding of which is connected to a second isolation power supply module.

[0008] In one embodiment, the number of isolated power supply modules, isolated communication modules, and second drive modules are all M and correspond one-to-one, where M is a positive integer not less than 1, and each second drive module is used to drive a corresponding brushless motor.

[0009] In one embodiment, the front-end power module, the isolation coupling module, the first isolation power module, the second isolation power module, the main control module, the non-isolated communication module, and the isolation communication module are all located on the motherboard; the first drive module is located on the first circuit board, and the first drive module and the non-isolated communication module are connected through corresponding communication lines; the second drive module is located on the second circuit board, and the second drive module and the isolation communication module are connected through corresponding communication lines.

[0010] In one embodiment, the non-isolated communication module is a non-isolated RS485 communication module, a non-isolated RS232 communication module, or a non-isolated UART communication module; the isolated communication module is an isolated RS485 communication module, an isolated RS232 communication module, or an isolated UART communication module.

[0011] The first aspect of this application also provides another motor control system connected to a motor assembly, the motor assembly including a brushless motor. The motor control system includes: a front-end power supply module, an isolation coupling module, a first isolation power supply module, N second isolation power supply modules, a main control module, N isolation communication modules, and N drive modules, where N is a positive integer not less than 1. The system comprises a front-end power supply module and each drive module connected to and powered by an AC power source. The front-end power supply module and the first isolated power supply module are connected to an isolation coupling module, which provides electrical isolation. The first isolated power supply module is also electrically isolated from each of the second isolated power supply modules. The main control module is connected to and powered by the first isolated power supply module. The first and second sides of the isolation communication module are electrically isolated, with the first side connected to the first isolated power supply module and the second side connected to the second isolated power supply module, thus providing isolated power supply from both modules. Each isolation communication module is connected to a different second isolated power supply module. The main control module communicates with each drive module through different isolation communication modules. Each drive module is connected to a different brushless motor, and the main control module controls each drive module, thereby enabling each drive module to independently drive a different brushless motor.

[0012] The first aspect of this application also provides another motor control system connected to a motor assembly, the motor assembly including a brushless motor. This motor control system includes: a front-end power supply module, an isolation coupling module, a first isolation power supply module, N second isolation power supply modules, a main control module, N isolation communication modules, and N drive modules, where N is a positive integer not less than 1. The system comprises a front-end power supply module and each drive module connected to and powered by an AC power source. The front-end power supply module, the first isolated power supply module, and each second isolated power supply module are connected to an isolation coupling module, which provides electrical isolation. The main control module is connected to and powered by the first isolated power supply module. The first and second sides of the isolation communication module are electrically isolated, with the first side connected to the first isolated power supply module and the second side connected to the second isolated power supply module, thus providing isolated power supply from both modules. Each isolation communication module is connected to a different second isolated power supply module. The main control module communicates with each drive module through different isolation communication modules. Each drive module is connected to a different brushless motor, and the main control module controls each drive module, thereby enabling each drive module to independently drive a different brushless motor.

[0013] A second aspect of this application provides an air compressor. The air compressor includes an air tank, a cylinder assembly mounted on the air tank, and a motor assembly and a transmission assembly housed in the cylinder assembly. The motor assembly includes multiple brushless motors. The air compressor also includes a motor control system as described in the first aspect or any embodiment of the first aspect. The motor control system is connected to the motor assembly and controls each brushless motor to drive the corresponding transmission assembly to reciprocate within the cylinder assembly.

[0014] Compared with the prior art, this application has at least the following advantages:

[0015] The motor control system of this application sets up a front-end power supply module, an isolation coupling module, a first isolation power supply module, a second isolation power supply module, a main control module, different communication modules and different drive modules, and uses different isolation power supplies to provide isolated power to the corresponding communication modules, uses different communication modules to communicate with the corresponding drive modules, and uses different drive modules to drive the corresponding brushless motors, thereby realizing independent and isolated driving of multiple different brushless motors.

[0016] The air compressor of this application, by setting up the motor control system of this application and multiple brushless motors, can achieve multi-head isolation control, which has high controllability, and can also improve the working efficiency of the air compressor and reduce the isolation control cost. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an air compressor provided in an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of a connection between the voltage control system and the motor assembly provided in Embodiment 1.

[0019] Figure 3 yes Figure 2 A structural block diagram of a front-end power supply module, an isolation coupling module, a first isolation power supply module, a second isolation power supply module, a non-isolated communication module, an isolation communication module, a first drive module, a second drive module, and a brushless motor.

[0020] Figure 4 This is a schematic diagram of the layout of the voltage control system and motor assembly provided in Embodiment 1.

[0021] Figure 5 This is a schematic diagram of a connection between the voltage control system and the motor assembly provided in Embodiment 2.

[0022] Figure 6 This is a schematic diagram of a connection between the voltage control system and the motor assembly provided in Embodiment 3.

[0023] Explanation of main component symbols

[0024] Detailed Implementation

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application. Unless otherwise specified, the different embodiments and features described below can be combined with each other.

[0026] In the description of this application, it should be understood that the terms "first," "second," "third," "fourth," etc., are used to distinguish different objects, not to describe a specific order. Terms indicating orientation or positional relationship, such as "upper," "lower," "inner," "outer," etc., are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] This application provides a motor control system and an air compressor using the motor control system, which can isolate and drive multiple different motors and improve the working efficiency of the air compressor.

[0028] Specifically, please refer to Figure 1 This is a schematic diagram of an air compressor 100 provided in an embodiment of this application.

[0029] like Figure 1 As shown, the air compressor 100 includes an air tank 1, a drive unit 2, and a control unit 3.

[0030] The drive unit 2 includes a cylinder assembly 21 mounted on the air tank 1, and a motor assembly 22 and a transmission assembly (not shown) housed inside the cylinder assembly 21. The cylinder assembly 21 has an air vent communicating with the outside, allowing external air to enter. The air tank 1 and the cylinder assembly 21 are connected by a pipe 4. The motor assembly 22 includes multiple brushless motors 221, each of which is connected to the cylinder assembly 21 via a corresponding transmission assembly, thereby driving the corresponding transmission assembly to reciprocate within the cylinder assembly 21, thereby forcing external air into the cylinder assembly 21. The external air then flows into and is stored in the air tank 1 via the pipe 4.

[0031] Control device 3 includes motor control system 31. Motor control system 31 can be housed in housing ( Figure 1 The brushless motors 221 (not numbered) are fixedly mounted above the gas storage tank 1 via a housing. The motor control system 31 is connected to the motor assembly 22 and is used to isolate and drive each brushless motor 221. In actual operation, the motor control system 31 can control all brushless motors 221 to work simultaneously, or control a portion of the brushless motors 221 to work while stopping the others, depending on actual needs. The operating parameters, such as the speed, of the different brushless motors 221 can be the same or different.

[0032] To better understand, the motor control system 31 will be described in detail below with reference to Embodiments 1 to 3. For ease of description, Embodiments 1 to 3 use the motor assembly 22, which includes two brushless motors 221, as an example for illustration and explanation. In Embodiments 1 to 3, for the accompanying drawings that simultaneously contain heating lines and non-thickened lines, the thickened lines represent power transmission lines, and the non-thickened lines represent control and communication lines.

[0033] Example 1

[0034] Please see Figure 2The motor control system 31 in Implementation 1 includes: a front-end power supply module 311, an isolation coupling module 312, a first isolation power supply module 313, a second isolation power supply module 314, a main control module 315, a non-isolated communication module 316, an isolation communication module 317, a first drive module 318, and a second drive module 319. The number of the second isolation power supply module 314, the isolation communication module 317, and the second drive module 319 can all be M, and they correspond one-to-one. Each second drive module 319 also corresponds to a brushless motor 221. M is a positive integer not less than 1, and its specific value can be selected according to actual needs. For ease of description, Implementation 1 uses M equal to 1 as an example.

[0035] The pre-amplifier power module 311 is connected to and powered by an AC power source (not shown). The AC power source can be, for example, the mains or other power sources that can provide AC voltage. The pre-amplifier power module 311 can be used to perform voltage conversion on the AC voltage from the AC power source, thereby providing a DC voltage Vdc and a DC reference ground GND.

[0036] The front-end power supply module 311, the first isolated power supply module 313, and the second isolated power supply module 314 are respectively connected to the isolation coupling module 312. The front-end power supply module 311 is electrically isolated through the isolation coupling module 312. The DC voltage Vdc generated by the front-end power supply module 311 can be coupled to the first isolated power supply module 313 and the second isolated power supply module 314 through the isolation coupling module 312, so that the first isolated power supply module 313 and the second isolated power supply module 314 are powered. The first isolated power supply module 313 thus provides the first power supply voltage VCC1 and the first reference ground GND1, and the second isolated power supply module 314 thus provides the second power supply voltage VCC2 and the second reference ground GND2.

[0037] It should be understood that the DC reference ground GND, the first reference ground GND1, and the second reference ground GND2 are not the same. In other words, the first isolation power supply module 313, the second isolation power supply module 314, and the front-end power supply module 311 do not share a common ground.

[0038] In practical applications, the front-end power supply module 311, the first isolation power supply module 313, and the second isolation power supply module 314 can all be selected with appropriate voltage conversion circuits according to the actual situation. The isolation coupling module 312 can be selected with appropriate isolation coupling devices or isolation coupling circuits according to the actual situation. This application does not make specific limitations in this regard.

[0039] For example, such as Figure 3As shown, the front-end power supply module 311 may include a rectifier circuit 3111, a DC-DC converter circuit 3112, and a power management circuit 3113. The rectifier circuit 3111, DC-DC converter circuit 3112, and power management circuit 3113 can all use corresponding general-purpose circuits. For example, the rectifier circuit 3111 is a rectifier bridge, the DC-DC converter circuit 3112 is a flyback converter circuit, and the power management circuit 3113 is composed of a power management chip and its peripheral circuits. The first isolation power supply module 313 can use a general-purpose rectifier and filter circuit, and the second isolation power supply module 314 can use a general-purpose regulated linear power supply circuit. The isolation coupling module 312 may include a transformer, which has a primary winding, a secondary winding, and an auxiliary winding. Both the primary and secondary windings of the transformer can be equipped with corresponding auxiliary windings, and the turns ratio between the primary winding, secondary winding, and auxiliary winding can be set according to actual needs.

[0040] The input terminal of the rectifier circuit 3111 is connected to an AC power supply. The output terminal of the rectifier circuit 3111 is connected to the primary winding of the transformer through the DC-DC converter circuit 3112. The secondary winding of the transformer is connected to the first isolation power supply module 313. The auxiliary winding on the secondary winding of the transformer is connected to the second isolation power supply module 314. The auxiliary winding on the primary winding of the transformer is connected to the power management circuit 3113. The power management circuit 3113 is also connected to the DC-DC converter circuit 3112.

[0041] The rectifier circuit 3111 rectifies the AC voltage from the AC power supply into a pulsating DC voltage. The DC-DC converter circuit 3112 then performs a DC-DC conversion on the pulsating DC voltage, thereby outputting a more stable DC voltage Vdc to the primary winding of the transformer. The transformer can generate a magnetic field, which enables energy coupling. Therefore, the secondary winding of the transformer can couple to generate a corresponding first coupling voltage V1, the auxiliary winding on the secondary winding can couple to generate a corresponding second coupling voltage V2, and the auxiliary winding on the primary winding can couple to generate a corresponding third coupling voltage V3. V1 can be used as the input voltage of the first isolation power supply module 313, which can convert V1 into a first power supply voltage VCC1. V2 can be used as the input voltage of the second isolation power supply module 314, which can convert V2 into a second power supply voltage VCC2. V3 can be used as the power supply voltage for the power management circuit 3113. The power management circuit 3113 can be used to control the voltage conversion process of the DC-DC converter circuit 3112 to control Vdc, thereby indirectly controlling the magnitudes of V1, V2, V3, VCC1, and VCC2.

[0042] Furthermore, in one embodiment, the second isolated power supply module 314 can also be connected to the power management circuit 3113 in the front-end power supply module 311 via an optocoupler (not shown) to feed back the second power supply voltage to the power management circuit 3113. The power management circuit 3113 then adjusts the voltage conversion process of the DC-DC converter circuit 3112, thereby realizing closed-loop regulation of Vdc, V1, V2, V3, VCC1, and VCC2.

[0043] In this embodiment, the first isolated power supply module 313 is connected to the main control module 315 and supplies power to the main control module 315. The main control module 315 may be, for example, a microcontroller unit (MCU), a digital signal processor (DSP), or other general-purpose controllers or processors.

[0044] The main control module 315 is connected to the first drive module 318 via the non-isolated communication module 316, and to the second drive module 319 via the isolated communication module 317.

[0045] Specifically, the non-isolated communication module 316 has a first side and a second side that are not electrically isolated. The first side of the non-isolated communication module 316 is the control side, and the second side is the communication side. The non-isolated communication module 316 is connected to the main control module 315 through the first side, and is connected to the first drive module 318 through the second side. The main control module 315 can thus communicate with the first drive module 318 through the non-isolated communication module 316.

[0046] The isolation communication module 317 has a first side and a second side with electrical isolation. The first side of the isolation communication module 317 is the control side, and the second side is the communication side. The isolation communication module 317 is connected to the main control module 315 through the first side, and the isolation communication module 317 is connected to the second drive module 319 through the second side. The main control module 315 can thus communicate with the second drive module 319 through the isolation communication module 317.

[0047] In this embodiment, the non-isolated communication module 316 can be a general non-isolated communication module such as a non-isolated RS485 communication module, a non-isolated RS232 communication module, or a non-isolated UART communication module, and the isolated communication module 317 can be a general isolated communication module such as an isolated RS485 communication module, an isolated RS232 communication module, or an isolated UART communication module.

[0048] Further examples, such as Figure 3As shown, the non-isolated communication module 316 may include a first communication chip 3161, a first peripheral control circuit 3162, and a first peripheral communication circuit 3163. The first communication chip 3161 is a non-isolated communication chip. The control-side pins of the first communication chip 3161 are connected to the main control module 315 through the first peripheral control circuit 3162, and the control-side pins of the first communication chip 3161 and the first peripheral control circuit 3162 constitute the first side of the non-isolated communication module 316. The communication-side pins of the first communication chip 3161 are connected to the first drive module 318 through the first peripheral communication circuit 3163, and the communication-side pins of the first communication chip 3161 and the first peripheral communication circuit 3163 constitute the second side of the non-isolated communication module 316. The first communication chip 3161 has a power supply pin for connecting to a power source; for example, the communication-side pins of the first communication chip 3161 may include this power supply pin.

[0049] like Figure 3 As shown, the isolated communication module 317 may include a second communication chip 3171, a second peripheral control circuit 3172, and a second peripheral communication circuit 3173. The second communication chip 3171 is an isolated communication chip. The control-side pins of the second communication chip 3171 are connected to the main control module 315 through the second peripheral control circuit 3172, and the control-side pins of the second communication chip 3171 and the second peripheral control circuit 3172 constitute the first side of the isolated communication module 317. The communication-side pins of the second communication chip 3171 are connected to the second drive module 319 through the second peripheral communication circuit 3173, and the communication-side pins of the second communication chip 3171 and the second peripheral communication circuit 3173 constitute the second side of the isolated communication module 317. The control-side pins and communication-side pins of the first communication chip 3161 each include corresponding power supply pins.

[0050] The first communication chip 3161, the first peripheral control circuit 3162, the first peripheral communication circuit 3163, the control-side pins of the second communication chip 3171, and the second peripheral control circuit 3172 are all connected to and powered by the first isolation power supply module 313. The communication-side pins of the second communication chip 3171 and the second peripheral communication circuit 3173 are both connected to and powered by the second isolation power supply module 314. In other words, the first and second sides of the non-isolated communication module 316, and the first side of the isolated communication module 317, are all connected to and powered by the first isolation power supply module 313. The second side of the isolated communication module 317 is connected to and powered by the second isolation power supply module 314. It can be understood that since the first isolation power supply module 313 and the second isolation power supply module 314 do not share a common ground, the first and second sides of the isolated communication module 317 can be isolated and powered by the first isolation power supply module 313 and the second isolation power supply module 314, respectively.

[0051] Both the first drive module 318 and the second drive module 319 are connected to and powered by an AC power source. The first drive module 318 and the second drive module 319 are also connected to different brushless motors 221. For ease of distinction, the brushless motor 221 connected to the first drive module 318 can be referred to as the first brushless motor 221, and the brushless motor 221 connected to the second drive module 319 can be referred to as the second brushless motor 221.

[0052] In actual operation, the main control system can transmit control signals from the first drive module 318 to the first drive module 318 via the non-isolated communication module 316, thereby controlling the first drive module 318 to drive the first brushless motor 221. The main control system can also transmit control signals from the second drive module 319 to the second drive module 319 via the non-isolated communication module 316, thereby controlling the second drive module 319 to drive the second brushless motor 221.

[0053] In this embodiment, the first drive module 318 may employ a brushless motor 221 drive circuit adapted to the non-isolated communication module 316. The second drive module 319 may employ a brushless motor 221 drive circuit adapted to the isolated communication module 317.

[0054] For example, such as Figure 3As shown, the first drive module 318 may include a first rectifier circuit 3181, a first voltage conversion circuit 3182, a first drive control circuit 3183, a first communication circuit 3184, and a first inverter circuit 3185. The first rectifier circuit 3181, the first voltage conversion circuit 3182, the first drive control circuit 3183, the first communication circuit 3184, and the first inverter circuit 3185 can all employ corresponding general-purpose circuits. For example, the first rectifier circuit 3181 is a rectifier bridge, the first voltage conversion circuit 3182 is a BUCK circuit, the first drive control circuit 3183 is composed of a first drive chip and its peripheral circuits, the first communication circuit 3184 is a communication circuit adapted to the non-isolated communication module 316, wherein the communication method of the first communication circuit 3184 is the same as or matches the communication method of the non-isolated communication module 316, and the first inverter circuit 3185 is a three-phase inverter bridge circuit.

[0055] The input terminal of the first rectifier circuit 3181 is connected to an AC power supply, and the output terminal of the first rectifier circuit 3181 is connected to the first drive control circuit 3183 and the first communication circuit 3184 through the first voltage conversion circuit 3182. Thus, the first rectifier circuit 3181 can rectify the AC voltage provided by the AC power supply into a DC voltage, and the first voltage conversion circuit 3182 can then step down the DC voltage output by the first rectifier circuit 3181 and transmit it to the first drive control circuit 3183 and the first communication circuit 3184 to supply power to them.

[0056] The output of the first rectifier circuit 3181 is also connected to the input of the first inverter circuit 3185, and the output of the first inverter circuit 3185 is connected to the corresponding brushless motor 221. The first inverter circuit 3185 and the first communication circuit 3184 are also connected to the first drive control circuit 3183. Thus, the first drive control circuit 3183 can communicate with the non-isolated communication module 316 through the first communication circuit 3184. Furthermore, the first drive control circuit 3183 can receive control signals from the main control module 315 and, based on the control signals, control the first inverter circuit 3185 to invert the DC voltage output by the first rectifier circuit 3181 into the operating voltage of the first brushless motor 221, enabling the first brushless motor 221 to rotate accordingly.

[0057] like Figure 3As shown, the second drive module 319 may include a second rectifier circuit 3191, a second voltage conversion circuit 3192, a second drive control circuit 3193, a second communication circuit 3194, and a second inverter circuit 3195. The second rectifier circuit 3191, the second voltage conversion circuit 3192, the second drive control circuit 3193, the second communication circuit 3194, and the second inverter circuit 3195 can all adopt corresponding general-purpose circuits. For example, the second rectifier circuit 3191 is a rectifier bridge, the second voltage conversion circuit 3192 is a BUCK circuit, the second drive control circuit 3193 is composed of a second drive chip and its peripheral circuits, the second communication circuit 3194 is a communication circuit adapted to the isolation communication module 317, wherein the communication method of the second communication circuit 3194 is the same as or matches the communication method of the isolation communication module 317, and the second inverter circuit 3195 is a three-phase inverter bridge circuit.

[0058] The output of the second rectifier circuit 3191 is also connected to the input of the second inverter circuit 3195, and the output of the second inverter circuit 3195 is connected to the corresponding brushless motor 221. The second inverter circuit 3195 and the second communication circuit 3194 are also connected to the second drive control circuit 3193. Thus, the second drive control circuit 3193 can communicate with the isolation communication module 317 through the second communication circuit 3194. Furthermore, the second drive control circuit 3193 can receive control signals from the main control module 315 and, based on these signals, control the second inverter circuit 3195 to invert the DC voltage output from the second rectifier circuit 3191 into the operating voltage of the second brushless motor 221, enabling the second brushless motor 221 to rotate accordingly.

[0059] Furthermore, the first drive module 318 and the second drive module 319 may also include current sensors or current detection circuits (not shown in the figure). The first drive control circuit 3183 detects the current of the first inverter circuit 3185 through the current sensor or current detection circuit, and adjusts the inverter process of the first inverter circuit 3185 according to the current of the first inverter circuit 3185, thereby adjusting the operation of the first brushless motor 221. The second drive control circuit 3193 detects the current of the second inverter circuit 3195 through the current sensor or current detection circuit, and adjusts the inverter process of the second inverter circuit 3195 according to the current of the second inverter circuit 3195, thereby adjusting the operation of the second brushless motor 221. When the first drive control circuit 3183 detects an abnormal current, such as overcurrent, through the current sensor or current detection circuit, it can also control the first inverter circuit 3185 to stop working, and can also feed back the abnormal current information to the main control module 315 through the first communication circuit 3184.

[0060] In this embodiment, the reference ground GNDA of the first driving module 318 is connected to the first reference ground GND1 of the first isolated power supply module 313. Thus, the reference ground GNDA of the first driving module 318 can be regarded as the first reference ground GND1. The reference ground GNDB of the second driving module 319 is connected to the second reference ground GND2 of the second isolated power supply module 314. Thus, the reference ground GNDB of the second driving module 319 can be regarded as the second reference ground GND2.

[0061] Based on this design, the reference ground GNDA of the first drive module 318 and the reference ground GNDB of the second drive module 319 can be independent and isolated from each other.

[0062] Moreover, from an overall perspective, such as Figure 2 As shown by the dashed lines, the entire motor control system 31 can be divided into three electrically isolated regions: the first electrically isolated region, the second electrically isolated region, and the third electrically isolated region.

[0063] Specifically, the front-end power supply module 311 constitutes the first electrical isolation region. The first isolated power supply module 313, the main control module 315, the non-isolated communication module 316, the first drive module 318, and the brushless motor 221 connected to the first drive module 318 together constitute the second electrical isolation region. The second isolated power supply module 314, the second drive module 319, and the brushless motor 221 connected to the second drive module 319 together constitute the third electrical isolation region.

[0064] The first and second electrical isolation regions are isolated by an isolation coupling module, the first and third electrical isolation regions are isolated by an isolation coupling module 312, and the second and third electrical isolation regions are isolated by an isolation communication module 317.

[0065] The reference ground for the first electrical isolation region is DC reference ground GND. The reference ground for the second electrical isolation region is the first reference ground GND1, meaning that the first isolated power supply module 313, the main control module 315, the first and second sides of the non-isolated communication module 316, the first drive module 318, and the first side of the isolated communication module 317 share a common ground. The reference ground for the third electrical isolation region is the second reference ground GND2, meaning that the second isolated power supply module 314, the second side of the isolated communication module 317, the second drive module 319, and its connected brushless motor 221 share a common ground.

[0066] It is understandable that since the pre-amplifier power module 311, the first drive module 318 and the second drive module 319 all draw power from AC power, if the pre-amplifier power module 311, the first drive module 318 and the second drive module 319 share a common ground, it is likely to cause mutual interference and generate the risk of circuit damage. In this embodiment, by setting up an isolation coupling module 312, a first isolation power supply module 313, and a second isolation power supply module 314, the isolation coupling module 312 isolates the front-end power supply module 311, the first isolation power supply module 313, and the second isolation power supply module 314. The first isolation power supply module 313 shares a common ground with the first side of the main control module 315, the non-isolated communication module 316, the first drive module 318, and the isolation communication module 317. The second isolation power supply module 314 shares a common ground with the second side of the isolation communication module 317 and the second drive module 319. In this way, the non-isolated communication module 316 and the first drive module 318 can communicate based on a unified reference ground, and the isolation communication module 317 and the second drive module 319 can also communicate based on a unified reference ground. At the same time, the second side of the non-isolated communication module 316 and the second side of the isolation communication module 317 can be independently isolated from each other, and the first drive module 318 and the second drive module 319 can also be independently isolated from each other. This ensures that the main control module 315 can communicate and control the first drive module 318 and the second drive module 319 respectively, while also ensuring that the front-end power supply module 311, the first drive module 318, and the second drive module 319 can be isolated and independent, thereby avoiding mutual interference and the risk of circuit damage.

[0067] Therefore, the motor driving processes of the first drive module 318 and the second drive module 319 can be isolated from each other. In other words, the main control system of this embodiment can drive different brushless motors 221 independently and in isolation through the first drive module 318 and the second drive module 319 respectively.

[0068] The first side of the non-isolated communication module 316 and the first side of the isolated communication module 317 are both powered by the first isolated power supply, which is beneficial for the main control module 315 to synchronously control the non-isolated communication module 316 and the isolated communication module 317.

[0069] Moreover, in this embodiment, the motor control system 31 uses a non-isolated communication module 316 and an isolated communication module 317 to achieve two-way isolated control. This is because the cost of the non-isolated communication module 316 is lower than that of the isolated communication module 317. For example, the price of the isolated communication module 317 is 3 to 4 times higher than that of the non-isolated communication module 316. Compared with the approach of using two isolated communication modules 317 to achieve two-way isolated control, the cost of the motor control system 31 in this embodiment can be reduced.

[0070] Furthermore, the brushless motor 221 in this embodiment does not require an additional isolated power supply. Therefore, the motor control system 31 in this embodiment has a simple structure and low cost. When it is necessary to increase the number of brushless motor 221 heads, the motor control system 31 can drive more brushless motors 221 by adding a second isolated power supply module 314, an isolated communication module 317, and a second drive module 319.

[0071] In one embodiment, such as Figure 2 As shown, the motor control system 31 may also include a pressure detection module 320. The pressure detection module 320 is located in the gas storage tank 1 and is connected to and powered by the first isolated power supply module 313. Here, the insulation level of the pressure detection module 320 itself already meets safety requirements, so it can be directly powered by the first isolated power supply module 313 without the need for additional isolated power supply design. This contributes to the low cost and simple design of the entire motor control system 31.

[0072] The pressure detection module 320 is also connected to the main control module 315. The pressure detection module 320 can detect the air pressure data inside the air tank 1 and send it to the main control module 315. The main control module 315 can then generate corresponding control signals based on the air pressure data detected by the pressure detection module 320 to control the first drive module 318 and the second drive module 319. It can be understood that the first drive module 318 and the second drive module 319 can drive corresponding transmission components to reciprocate within the cylinder assembly 21, thereby regulating the air pressure within the cylinder assembly 21, such as increasing the air pressure, decreasing the air pressure, or maintaining a stable air pressure. Therefore, this embodiment controls the first drive module 318 and the second drive module 319 based on the air pressure data detected by the pressure detection module 320, achieving closed-loop control of the air pressure inside the cylinder assembly 21.

[0073] In one embodiment, the motor control system 31 may further include an input module (not shown in the figure), which is connected to the main control module 315. The main control module 315 can access relevant information through the input module. The input module includes, but is not limited to, buttons, switches, and / or touchscreens. Accordingly, operators can input information to the main control module 315 by pressing buttons, operating switches, and / or touching the touchscreen. The input information may include, for example, a start command to instruct the motor control system 31 to start operation, a pressure setpoint for the air compressor 100, motor control information indicating the operating status of a brushless motor 221, a shutdown command to instruct the motor control system 31 to stop, and so on.

[0074] In one embodiment, the motor control system 31 may further include an output module (not shown), which is connected to the main control module 315. The main control module 315 can output or display information about the air compressor 100 through the output module. The output module includes, but is not limited to, a display screen, a speaker, and / or indicator lights. When the display screen is a touch screen, it can simultaneously serve as both an input and output module. Accordingly, the output module can display, play, and / or indicate information about the air compressor 100 through methods such as illumination or flashing. Information about the air compressor 100 may include, for example, the actual air pressure and air pressure setpoint of the air compressor 100, abnormal information such as current anomalies, whether the brushless motor 221 is running, its speed, and operating time.

[0075] In practical applications, at least some of the following modules can be integrated onto the same circuit board, depending on actual needs: the pre-amplifier module 311, the isolation coupling module 312, the first isolation power module 313, the second isolation power module 314, the main control module 315, the non-isolated communication module 316, the isolation communication module 317, the first drive module 318, the second drive module 319, the pressure detection module 320, the input module, and the output module.

[0076] For example, in one embodiment, such as Figure 4 As shown, the pre-amplifier power module 311, isolation coupling module 312, first isolation power module 313, second isolation power module 314, main control module 315, non-isolated communication module 316, isolation communication module 317, pressure detection module 320, input module, and output module are all located on the main board 321. The first drive module 318 is located on the first circuit board 322, and the first drive module 318 and non-isolated communication module 316 are connected via corresponding communication lines. The second drive module 319 is located on the second circuit board 323, and the second drive module 319 and isolation communication module 317 are connected via corresponding communication lines. For convenient wiring, corresponding interfaces (not shown) can also be provided on the main board 321, the first circuit board 322, and the second circuit board 323. The interface on the main board 321 connects to one end of the communication line, and the interface on the first circuit board 322 or the interface on the second circuit board 323 can connect to the other end of the communication line. The main board 321, the first circuit board 322, and the second circuit board 323 can also adopt a stacked layout or a distributed layout, etc., depending on the actual situation.

[0077] Example 2

[0078] Please see Figure 5The motor control system 31 in Implementation Two includes: a front-end power supply module 311A, an isolation coupling module 312A, a first isolation power supply module 313A, a second isolation power supply module 314A, a main control module 315A, an isolation communication module 317A, and a drive module 324A. The number of the second isolation power supply module 314A, the isolation communication module 317A, and the drive module 324A can all be N, and they correspond one-to-one. N is a positive integer not less than 1, and its specific value can be selected according to actual needs. For ease of description, Implementation Two uses N equal to 2 as an example.

[0079] Therefore, the main difference between Embodiment 2 and Embodiment 1 is that Embodiment 2 includes a first isolated power supply module 313A and two second isolated power supply modules 314A, totaling three isolated power supply modules, and also includes two isolated communication modules 317A. Based on this, the power supply and driving of the two drive modules 324A in Embodiment 2 also differ from those in Embodiment 1.

[0080] Specifically, in Embodiment 2, the front-end power module 311A ​​is connected to and powered by an AC power source. The front-end power module 311A ​​and the first isolated power module 313A are respectively connected to an isolation coupling module 312A, and are electrically isolated from each other via the isolation coupling module 312A. The front-end power module 311A ​​is also electrically isolated from each of the second isolated power modules 314A, and the first isolated power module 313A is also electrically isolated from each of the second isolated power modules 314A.

[0081] The front-end power module 311A, isolation coupling module 312A, and first isolation power module 313A can all be described as in Embodiment 1, and will not be repeated here. Each second isolation power module 314A can adopt a general-purpose isolated voltage conversion circuit, such as an LLC resonant converter circuit, a dual active bridge circuit, etc. The input terminal of each second isolation power module 314A can draw power from the first isolation power module 313A or other power sources. Figure 5 (Not illustrated in the diagram), and is not limited here. Each isolated voltage conversion circuit has its own isolation transformer, so the input and output terminals of the second isolated power supply module 314A are isolated from each other. Based on this, each second isolated power supply module 314A can be electrically isolated from the preceding power supply module 311A ​​and the first isolated power supply module 313A, and different second isolated power supply modules 314A can also be electrically isolated from each other.

[0082] The main control module 315A is connected to and powered by the first isolated power supply module 313A. The first side of the isolated communication module 317A is connected to the first isolated power supply module 313A, and the second side of the isolated communication module 317A is connected to the second isolated power supply module 314A. The isolated communication module 317A is thus isolated and powered by both the first isolated power supply module 313A and the second isolated power supply module 314A. The second side of each isolated communication module 317A is connected to a different second isolated power supply module 314A. Each drive module 324A is connected to and powered by an AC power supply. Each drive module 324A is connected to a different brushless motor 221.

[0083] The structures of the main control module 315A and the isolation communication module 317A can be referred to the description in Embodiment 1, and will not be repeated here. It should be understood that the second sides of the different isolation communication modules 317A used to connect to the drive module 324A are electrically isolated.

[0084] The drive module 324A can adopt a brushless motor drive circuit adapted to the isolation communication module 317A. Other contents of the drive module 324A can also refer to the relevant description of the second drive module 324A in Embodiment 1, so they will not be repeated here.

[0085] In actual operation, the main control module 315A can communicate with each drive module 324A through different isolation communication modules 317A, thereby transmitting the control signals of the corresponding drive module 324A to each drive module 324A to control each drive module 324A to drive the connected brushless motor 221.

[0086] In Embodiment 2, the reference ground of each drive module 324A is connected to the reference ground of its connected second isolated power supply module 314A. Based on this design, the reference grounds of each drive module 324A are independent and isolated from each other.

[0087] Moreover, from an overall perspective, such as Figure 5 As shown by the dashed lines, the entire motor control system 31 can be divided into four electrically isolated regions: the first electrically isolated region, the second electrically isolated region, the third electrically isolated region, and the fourth electrically isolated region.

[0088] Specifically, the front-end power module 311A ​​constitutes the first electrical isolation region. The first isolated power module 313A and the main control module 315A together constitute the second electrical isolation region. The output terminal of one of the second isolated power modules 314A, its corresponding drive module 324A, and the brushless motor 221 together constitute the third electrical isolation region. The output terminal of another second isolated power module 314A, its corresponding drive module 324A, and the brushless motor 221 together constitute the fourth electrical isolation region.

[0089] The first and second electrical isolation regions are isolated from each other through an isolation coupling module. The first, third, and fourth electrical isolation regions are mutually isolated due to the independence and isolation of the two second isolation power supply modules 314A.

[0090] The reference ground of the first electrical isolation region is the DC reference ground GND of the front-end power module 311A. The reference ground of the second electrical isolation region is the first reference ground GND1 of the first isolated power module 313A. That is to say, the first isolated power module 313A, the main control module 315A and the two isolated communication modules 317A share a common ground on their first sides.

[0091] The reference ground of the third electrical isolation zone is the second reference ground GND2 of the second isolation power supply module 314A in the zone. That is, the output terminal of one of the second isolation power supply modules 314A of the motor control system 31, the second side of the corresponding isolation communication module 317A, the drive module 324A and the brushless motor 221 share the same ground.

[0092] The reference ground of the fourth electrical isolation zone is the third reference ground GND3 of the second isolation power supply module 314A in this zone. That is, the output terminal of the other second isolation power supply module 314A of the motor control system 31, the second side of its corresponding isolation communication module 317A, the drive module 324A and the brushless motor 221 share the same ground.

[0093] It is understandable that, since the pre-amplifier power module 311A ​​and each driver module 324A draw power from AC power, if the pre-amplifier power module 311A ​​and each driver module 324A share a common ground, they are prone to mutual interference and the risk of circuit damage. In this embodiment, by setting up an isolation coupling module 312A, a first isolation power supply module 313A, and a second isolation power supply module 314A, the isolation coupling module 312A isolates the front-end power supply module 311A ​​and the first isolation power supply module 313A. By using an independent and isolated second isolation power supply module 314A, and by grounding the first isolation power supply module 313A, the main control module 315A, and the first sides of each isolation communication module 317A, and the second sides of each second isolation power supply module 314A and the drive module 324A connected to it in sequence, communication can be achieved between each isolation communication module 317A and its connected drive module 324A based on a unified reference ground. At the same time, the second sides of each isolation communication module 317A can be independently isolated from each other, and the second drive modules 324A can also be independently isolated from each other. This ensures that the main control module 315A can communicate and control each drive module 324A separately, while also ensuring that the front-end power supply module 311A ​​and each drive module 324A are isolated and independent, thereby avoiding mutual interference and the risk of circuit damage.

[0094] Therefore, the motor driving process of each drive module 324A can be isolated from each other. In other words, the main control system in this embodiment can drive different brushless motors 221 independently and in isolation through different drive modules 324A.

[0095] It should be understood that other aspects of Embodiment 2 can be found in the relevant descriptions in Embodiment 1, and therefore will not be repeated here.

[0096] Example 3

[0097] Please see Figure 6 The motor control system 31 in Implementation Three includes: a front-end power supply module 311B, an isolation coupling module 312B, a first isolation power supply module 313B, a second isolation power supply module 314B, a main control module 315B, an isolation communication module 317B, and a drive module 324B. The number of the second isolation power supply module 314B, the isolation communication module 317B, and the drive module 324B can all be N, and they correspond one-to-one. N is a positive integer not less than 1, and its specific value can be selected according to actual needs. For ease of description, Implementation Three uses N equal to 2 as an example.

[0098] The main difference between Embodiment 3 and Embodiment 1 is that Embodiment 3 includes a first isolated power supply module 313B and two second isolated power supply modules 314B, totaling three isolated power supply modules, and also includes two isolated communication modules 317B. Based on this, the power supply and driving of the two drive modules 324B in Embodiment 3 differ from those in Embodiment 1. Furthermore, the power supply for the two drive modules 324B in Embodiment 3 also differs from that in Embodiment 2.

[0099] Specifically, in Embodiment 3, the front-end power module 311B and each drive module 324B are respectively connected to and powered by an AC power source. The front-end power module 311B, the first isolation power module 313B, and each second isolation power module 314B are respectively connected to the isolation coupling module 312B. Further, the isolation coupling module 312B may include a transformer, which has a primary winding, a secondary winding, and N auxiliary windings. The primary winding is connected to the front-end power module 311B, the secondary winding is connected to the first isolation power module 313B, and the N auxiliary windings are connected one-to-one with the N second isolation power modules 314B. Based on this design, the front-end power module 311B, the first isolation power module 313B, and each second isolation power module 314B can be electrically isolated from each other through the isolation coupling module 312B.

[0100] The main control module 315B is connected to and powered by the first isolated power supply module 313B. The isolated communication module 317B is connected to the first isolated power supply module 313B via a first side and to the second isolated power supply module 314B via a second side, thus being isolated by both the first and second isolated power supply modules 313B and 314B. The second side of each isolated communication module 317B is connected to a different second isolated power supply module 314B. Each drive module 324B is connected to and powered by an AC power supply. Each drive module 324B is connected to a different brushless motor 221.

[0101] In actual operation, the main control module 315B can communicate with each drive module 324B through different isolation communication modules 317B, thereby transmitting the control signals of the corresponding drive module 324B to each drive module 324B to control each drive module 324B to drive the connected brushless motor 221.

[0102] The front-end power module 311B, isolation coupling module 312B, first isolation power module 313B, second isolation power module 314B, isolation communication module 317B, and drive module 324B can all refer to the description in Embodiment 1, and will not be repeated here.

[0103] In Embodiment 3, the reference ground of each drive module 324B is connected to the reference ground of its connected second isolated power supply module 314B. Based on this design, the reference grounds of each drive module 324B are independent and isolated from each other.

[0104] Moreover, from an overall perspective, such as Figure 6 As shown by the dashed lines, the entire motor control system 31 can be divided into four electrically isolated regions: the first electrically isolated region, the second electrically isolated region, the third electrically isolated region, and the fourth electrically isolated region.

[0105] The first electrical isolation region is formed by the front-end power module 311B. The first isolation power module 313B and the main control module 315B together form the second electrical isolation region. One of the second isolation power modules 314B, its corresponding drive module 324B, and the brushless motor 221 together form the third electrical isolation region. The other second isolation power module 314B, its corresponding drive module 324B, and the brushless motor 221 together form the fourth electrical isolation region.

[0106] The first, second, third, and fourth electrical isolation zones are isolated from each other through an isolation coupling module.

[0107] The reference ground of the first electrical isolation region is the DC reference ground GND of the front-end power module 311B. The reference ground of the second electrical isolation region is the first reference ground GND1 of the first isolated power module 313B. That is to say, the first isolated power module 313B, the main control module 315B and the two isolated communication modules 317B share a common ground on their first sides.

[0108] The reference ground of the third electrical isolation zone is the second reference ground GND2 of the second isolation power supply module 314B in the zone. That is, one of the second isolation power supply modules 314B of the motor control system 31, the second side of its corresponding isolation communication module 317B, the drive module 324B and the brushless motor 221 share the same ground.

[0109] The reference ground of the fourth electrical isolation zone is the third reference ground GND3 of the second isolation power supply module 314B in this zone. That is, the other second isolation power supply module 314B of the motor control system 31, its corresponding isolation communication module 317B, the drive module 324B and the brushless motor 221 share the same ground.

[0110] It is understandable that, since the pre-amplifier power module 311B and each driver module 324B draw power from AC power, if the pre-amplifier power module 311B and each driver module 324B share a common ground, they are prone to mutual interference and the risk of circuit damage. In this embodiment, by setting up an isolation coupling module 312B, a first isolation power supply module 313B, and a second isolation power supply module 314B, the isolation coupling module 312B isolates the front-end power supply module 311B, the first isolation power supply module 313B, and each of the second isolation power supply modules 314B. The first isolation power supply module 313B, the main control module 315B, the first side of the isolation communication module 317B connected to the first isolation power supply module 313B, and the drive module 324B share a common ground. The second isolation power supply module 314B, the second side of the isolation communication module 317B connected to the second isolation power supply module 314B, and the drive module 324B share a common ground. In this way, each isolation communication module 317B and its connected drive module 324B can communicate based on a unified reference ground. At the same time, each isolation communication module 317B can be independently isolated from each other, and each of the second drive modules 324B can also be independently isolated from each other. This ensures that the main control module 315B can communicate and control each drive module 324B separately, while also ensuring that the front-end power supply module 311B and each drive module 324B are isolated and independent, thereby avoiding the risk of mutual interference and circuit damage.

[0111] Therefore, the motor driving process of each drive module 324B can be isolated from each other. In other words, the main control system in this embodiment can drive different brushless motors 221 independently and in isolation through different drive modules 324B.

[0112] It should be understood that other contents of Embodiment 3 can also refer to the relevant descriptions in Embodiment 1, so they will not be repeated here.

[0113] It should be understood that the motor control system 31 described in Embodiments 1 to 3 is only an illustrative example provided by this application. In actual applications, some components or functional modules in the motor control system 31 can be combined or separated. The motor control system 31 may also include more or fewer components than shown in the figure. The specific adjustments can be made according to the actual situation, as long as the motor control system 31 can drive different brushless motors 221 independently and in isolation.

[0114] In summary, the motor control system of this application embodiment achieves independent and isolated driving of different brushless motors by setting up a front-end power supply module, an isolation coupling module, a first isolation power supply module, a second isolation power supply module, a main control module, different communication modules, and different drive modules. Different isolation power supplies provide isolated power to the corresponding communication modules, different communication modules communicate with their corresponding drive modules, and different drive modules drive their respective brushless motors. Furthermore, the motor control system of this application embodiment has a simple structure and high electrical safety.

[0115] The air compressor in this embodiment achieves multi-head isolated control by setting up a motor control system and multiple brushless motors. Moreover, compared to brushed motors, brushless motors eliminate the brushes, and the rotor does not contact the brushes, avoiding electrical sparks. Therefore, brushless motors have low losses, long service life, high operating efficiency, and less electromagnetic interference. Their drive design has very low requirements for reducing losses, electrical sparks, and electromagnetic interference. Therefore, the design complexity of the motor control system in this embodiment is low. By driving multiple brushless motors through the motor control system, the air compressor in this embodiment can improve its working efficiency and reduce isolation control costs.

[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A motor control system, connected to a motor assembly, characterized in that, The motor assembly includes a brushless motor; the motor control system includes: a front-end power supply module, an isolation coupling module, a first isolation power supply module, a second isolation power supply module, a main control module, a non-isolated communication module, an isolated communication module, a first drive module, and a second drive module; wherein... The pre-stage power module, the first drive module, and the second drive module are respectively used to connect to an AC power source and are powered by the AC power source. The front-end power module, the first isolation power module, and the second isolation power module are respectively connected to the isolation coupling module and are electrically isolated through the isolation coupling module. The non-isolated communication module and the main control module are respectively connected to the first isolated power supply module and are powered by the first isolated power supply module; The first and second sides of the isolated communication module are electrically isolated, and the first side is connected to the first isolated power supply module, and the second side is connected to the second isolated power supply module, so that the first isolated power supply module and the second isolated power supply module provide isolated power supply. The main control module communicates with the first drive module through the non-isolated communication module and communicates with the second drive module through the isolated communication module. The first drive module and the second drive module are respectively connected to different brushless motors. The main control module is used to control the first drive module and the second drive module, so that the first drive module and the second drive module can independently drive different brushless motors.

2. The motor control system as described in claim 1, characterized in that, The non-isolated communication module includes a first communication chip, a first peripheral control circuit, and a first peripheral communication circuit. The first communication chip is connected to the main control module through the first peripheral control circuit and to the first drive module through the first peripheral communication circuit. The isolated communication module includes a second communication chip, a second peripheral control circuit, and a second peripheral communication circuit. The control-side pins of the second communication chip are connected to the main control module through the second peripheral control circuit, and the communication-side pins of the second communication chip are connected to the second drive module through the second peripheral communication circuit. The first peripheral control circuit and the first peripheral communication circuit are both connected to the first isolated power supply module and are powered by the first isolated power supply module. The control-side pins of the second communication chip and the second peripheral control circuit are both connected to the first isolated power supply module and are powered by the first isolated power supply module; the control-side pins of the second communication chip and the second peripheral control circuit constitute the first side of the isolated communication module. The communication-side pins of the second communication chip and the second peripheral communication circuit are both connected to the second isolated power supply module and powered by the second isolated power supply module; the communication-side pins of the second communication chip and the second peripheral communication circuit constitute the second side of the isolated communication module.

3. The motor control system as described in claim 1, characterized in that, The first isolated power supply module, the second isolated power supply module, and the front-end power supply module do not share a common ground; the first isolated power supply module shares a common ground with the non-isolated communication module, the first side of the isolated communication module, and the first drive module; the second isolated power supply module shares a common ground with the second side of the isolated communication module and the second drive module.

4. The motor control system as described in claim 3, characterized in that, The isolation coupling module includes a transformer, the primary winding of which is connected to the preceding power supply module, the secondary winding of which is connected to the first isolation power supply module, and the auxiliary winding of which is connected to the second isolation power supply module.

5. The motor control system as described in claim 1, characterized in that, The number of the isolated power supply module, the isolated communication module and the second drive module are all M and correspond one-to-one, where M is a positive integer not less than 1. Each second drive module is used to drive a corresponding brushless motor.

6. The motor control system as described in claim 1, characterized in that, The front-end power module, the isolation coupling module, the first isolation power module, the second isolation power module, the main control module, the non-isolated communication module, and the isolation communication module are all located on the motherboard; The first driving module is mounted on the first circuit board, and the first driving module and the non-isolated communication module are connected through corresponding communication lines; The second drive module is located on the second circuit board, and the second drive module and the isolation communication module are connected through corresponding communication lines.

7. The motor control system as described in claim 1, characterized in that, The non-isolated communication module is a non-isolated RS485 communication module, a non-isolated RS232 communication module, or a non-isolated UART communication module; the isolated communication module is an isolated RS485 communication module, an isolated RS232 communication module, or an isolated UART communication module.

8. A motor control system, connected to a motor assembly, characterized in that, The motor assembly includes a brushless motor; the motor control system includes: a front-end power supply module, an isolation coupling module, a first isolation power supply module, N second isolation power supply modules, a main control module, N isolation communication modules, and N drive modules, where N is a positive integer not less than 1; wherein, The front-end power module and each of the drive modules are respectively used to connect to an AC power source and are powered by the AC power source; The front-end power module and the first isolation power module are respectively connected to the isolation coupling module and are electrically isolated through the isolation coupling module; the first isolation power module is also electrically isolated from each of the second isolation power modules. The main control module is connected to the first isolated power supply module and is powered by the first isolated power supply module; The first and second sides of the isolated communication module are electrically isolated, and the first side is connected to the first isolated power supply module, and the second side is connected to the second isolated power supply module, so that the first isolated power supply module and the second isolated power supply module provide isolated power supply; wherein each of the isolated communication modules is respectively connected to a different second isolated power supply module; The main control module communicates with each of the drive modules through different isolation communication modules. Each drive module is connected to a different brushless motor. The main control module controls each drive module, thereby driving the different brushless motors independently through the drive modules.

9. A motor control system, connected to a motor assembly, characterized in that, The motor assembly includes a brushless motor; the motor control system includes: a front-end power supply module, an isolation coupling module, a first isolation power supply module, N second isolation power supply modules, a main control module, N isolation communication modules, and N drive modules, where N is a positive integer not less than 1; wherein, The front-end power module and each of the drive modules are respectively used to connect to an AC power source and are powered by the AC power source; The front-end power module, the first isolation power module, and each of the second isolation power modules are respectively connected to the isolation coupling module and are electrically isolated through the isolation coupling module. The main control module is connected to the first isolated power supply module and is powered by the first isolated power supply module; The first and second sides of the isolated communication module are electrically isolated, and the first side is connected to the first isolated power supply module, and the second side is connected to the second isolated power supply module, so that the first isolated power supply module and the second isolated power supply module provide isolated power supply; wherein each of the isolated communication modules is respectively connected to a different second isolated power supply module; The main control module communicates with each of the drive modules through different isolation communication modules. Each drive module is connected to a different brushless motor. The main control module controls each drive module, thereby driving the different brushless motors independently through the drive modules.

10. An air compressor, the air compressor comprising an air tank, a cylinder assembly mounted on the air tank, and a motor assembly and a transmission assembly housed in the cylinder assembly, characterized in that, The motor assembly includes multiple brushless motors; the air compressor also includes a motor control system as described in any one of claims 1 to 9, the motor control system being connected to the motor assembly and controlling each brushless motor to drive a corresponding transmission component to reciprocate within the cylinder assembly.

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