A driving motor rotary transformer zero adjustment overdrive device and method thereof

Abstract

The application belongs to the technical field of motor control, and discloses a driving motor rotary variable zero overdrive device, which comprises a motor sleeve, handles fixedly installed on both sides of the middle part of the surface of the motor sleeve, a motor cover and an overdrive device arranged at the top and the bottom of the motor sleeve respectively, a lifting ring fixedly installed at the middle part of the top of the motor cover, a direct-current brushless motor fixedly installed in the motor sleeve, and a chuck head arranged at the bottom of the overdrive device. The driving motor rotary variable zero overdrive device and the method thereof, the controller is added with rotary variable zero coding in the software compiling process, the driving motor is driven to rotate at a constant speed through the overdrive device, a rotary variable tester tracks and measures respective working waveforms of the driving motor and the rotary variable transformer, so that the mutual position parameters between the driving motor stator and the rotor are identified in a parameterized manner, and the position parameters are burned and engraved on the controller ROM chip together with other control programs, so that the driving motor rotary variable zero is solved.

Description

Technical Field

[0001] This invention belongs to the field of motor control technology, specifically a drive motor resolver zeroing and overtaking drive device and method. Background Technology

[0002] Zeroing the resolver is a crucial step in the assembly of a drive motor. This step involves installing a resolver transformer, fixing the resolver rotor on the resolver transformer to the rotor assembly, and fixing the resolver stator on the resolver transformer to the stator assembly. The resolver rotor rotates with the rotor assembly, and the analog signal emitted by the resolver rotor is converted into a digital signal by an R / D converter chip, indicating the absolute position of the rotor assembly. By zeroing the resolver, the position calibration between the stator and rotor of the drive motor is completed.

[0003] During the input of power to the drive motor, in order to accurately control the instantaneous speed and torque of the drive motor, the frequency and magnitude of the input three-phase AC current must be precisely determined by the detected absolute position of the rotor assembly. Therefore, the accuracy of the resolver zeroing directly affects the power performance and working efficiency of the drive motor.

[0004] With the continuous development of new energy vehicles, electric drive systems are evolving towards greater variety, integration, high performance, and low loss, and the shortcomings of the original resolver mechanical zero-adjustment method are becoming increasingly apparent. First, due to the varying levels of operator skill and the vibrations caused by personnel during operation, the zeroing error of the drive motor resolver is relatively large under batch conditions. Consequently, the rated power and maximum power of the drive motor fluctuate during the assembly testing process, and the noise curve of the whole machine (including mechanical noise and electromagnetic noise) shows abnormal changes. Secondly, the production efficiency is low. Zeroing the resolver is the bottleneck process in the entire drive motor assembly process. Its single-station operation time is 3 to 4 times that of other processes. In actual production, the balance rate problem within the process can only be solved by relying on multiple stations in a single process. Finally, the test controller suffers from poor compatibility, high testing requirements, and high operational risks. The drive motor requires the controller to input three-phase high-voltage electricity and provide control drive. Different drive motors require controllers with different programs and configurations, resulting in poor compatibility of the test controller (for testing) and inability to handle different types of drive motors. In addition, the controller itself requires a high-voltage distribution cabinet and a host computer. The high-voltage distribution cabinet is used to input high-voltage DC electricity to the controller, resulting in high power transmission costs and high operational risks. The host computer provides the drive motor control logic and outputs the resolver zeroing parameters in real time to guide the operator to manually complete the resolver zeroing.

[0005] In summary, the use of the resolver mechanical zeroing method requires high-end hardware and software specifications, resulting in significant investment in basic equipment. This paper addresses this issue by developing a software-based zeroing method for calibrating the position between the stator and rotor of the drive motor, based on an overrunning drive device and a resolver testing instrument. Summary of the Invention

[0006] (a) Technical problems to be solved To address the problems mentioned in the background section, this invention provides a drive motor resolver zeroing overrunning drive device and method, which has the advantages of simple and stable control, low cost, and good compatibility.

[0007] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a drive motor resolver zeroing overrunning drive device, comprising a motor sleeve, handles fixedly installed on both sides of the middle of the surface of the motor sleeve, a motor cover and an overrunning drive device respectively provided on the top and bottom of the motor sleeve, a lifting ring fixedly installed in the middle of the top of the motor cover, a DC brushless motor fixedly installed inside the motor sleeve, and a screwdriver bit provided at the bottom of the overrunning drive device; The overrunning drive device includes a drive sleeve, a drive shaft is provided at the upper end of the drive sleeve, an overrunning bearing is movably engaged at the upper end of the drive shaft surface, and an upper ball bearing and a lower ball bearing are respectively engaged at the middle and lower ends of the drive shaft surface. The output shaft of the DC brushless motor is fixedly installed with the drive shaft, and the interior of the drive shaft is fixedly installed with the top of the bit.

[0008] In the above technical solution, preferably, the overrunning bearing, drive shaft, upper ball bearing and lower ball bearing are all located inside the drive sleeve, and there is a gap between the bottom of the drive sleeve and the motor sleeve.

[0009] In the above technical solution, preferably, the drive sleeve has an annular groove with a gradually decreasing diameter and a cylindrical groove at the bottom. Multiple annular grooves form an annular groove group. The drive shaft is located in the middle of the annular groove group. The overrunning bearing, the upper ball bearing, and the lower ball bearing are respectively engaged between the drive shaft and the annular groove group from top to bottom. The cylindrical groove is used to place the bit structure.

[0010] In the above technical solution, preferably, the surface of the motor sleeve is made of hard metal copper material, and heat sinks are uniformly arranged on its surface.

[0011] This application also proposes a method for zero-adjustment overrunning drive of a resolver motor, the specific steps of which are as follows: S1. The lifting ring can be used to connect to the hand chain hoist on the line. By adjusting the spring force of the hand chain hoist, the weight of the overdrive assembly can be balanced, making it convenient for the operator to operate freely. S2. The motor cover is used to install and store the DC brushless motor. The overrunning drive device and the line are integrated by the lifting ring on the motor cover. The handles on both sides of the motor cover are for easy hand operation by the operator. S3. The tested drive motor assembly is transferred to the resolver zeroing process along with the logistics pallet of the production line. The production line lifts and positions the tested drive motor assembly. The operator turns on the DC power supply to ensure that the DC power is stably output to the driver. The power output state of the DC brushless motor is set at one time through the speed controller and forward / reverse control switch. S4. The operator turns on the resolver tester and connects the UVW three-phase data cable and resolver data cable provided with the resolver tester to the drive motor and resolver transformer respectively. Pull the overrunning drive device off the hand chain hoist, align the bit with the resolver rotor locking screw drive head on the rotor assembly, and turn on the control switch on the overrunning drive device. The bit drives the rotor assembly to rotate at a constant speed at a set time. The voltage sinusoidal waveform of the drive motor and resolver transformer windings changing with time can be read in real time on the resolver tester. Through the system's automatic calculation, the relative position parameters between the stator and rotor of the drive motor are output. The laser engraving machine engraves these parameters at the specified position on the drive motor housing, thus completing the resolver zeroing test of the drive motor. S5. The drive motor completes the installation of the remaining reducer and controller along with the production line. Before the assembly test, the mutual position parameters and other control programs are burned onto the controller ROM chip. The assembly performance test is started. The assembly bench performance test is completed according to the control program set by the host computer of the assembly test bench. Once the test is passed, the assembly can be taken off the production line, completing the assembly and testing of the entire electric drive system.

[0012] In the above technical solutions, the preferred method is to use a software zeroing method based on an overrunning drive device and a resolver tester to complete the position calibration between the stator and rotor of the drive motor.

[0013] In the above technical solution, preferably, the overtaking drive device has its own DC power supply, and its driving force comes from a DC brushless motor. The DC brushless motor realizes the adjustment or disconnection of the driving force through its matching control assembly. The overtaking drive device includes an overtaking mechanism, which is rigidly connected to the DC brushless motor and selectively directionally outputs the power generated by the DC brushless motor to ensure that the power generated by the drive motor runs or disconnects in the required direction.

[0014] In the above technical solutions, the preferred method is to use a software zeroing method based on an overrunning drive device and a resolver tester to complete the position calibration between the stator and rotor of the drive motor.

[0015] In the above technical solution, preferably, the controller adds resolver zeroing code during the software compilation process, drives the motor to rotate at a constant speed through the overrunning drive device, and tracks and measures the working waveforms of the drive motor and resolver transformer respectively, thereby parametrically identifying the mutual position parameters between the stator and rotor of the drive motor. The position parameters, together with other control programs, are burned onto the controller ROM chip, thus solving the problem of resolver zeroing of the drive motor.

[0016] (III) Beneficial Effects Compared with the prior art, the beneficial effects of the present invention are as follows: This case discloses a resolver zeroing overrunning drive device and method for a drive motor. The controller adds resolver zeroing code during the software compilation process. The overrunning drive device drives the motor to rotate at a constant speed. The resolver tester tracks and measures the respective working waveforms of the drive motor and the resolver transformer, thereby parametrically identifying the mutual position parameters between the stator and rotor of the drive motor. The position parameters, along with other control programs, are burned onto the controller's ROM chip, thus solving the problem of resolver zeroing of the drive motor. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a mechanical zero-adjustment method for a drive motor using a resolver. Figure 2 This is a schematic diagram of a software zero-adjustment method for a drive motor resolver. Figure 3 This is a schematic diagram of a resolver zero-adjustment overrunning drive device and its control assembly. Figure 4 This is a schematic diagram of the appearance of a rotary converter zero-adjustment overrunning drive device; Figure 5 This is a cross-sectional schematic diagram of a rotary converter zero-adjustment overrunning drive device; Figure 6 A schematic diagram of the drive sleeve in a resolver zeroing overdrive device. Figure 7 A cross-sectional schematic diagram of the drive sleeve in a resolver zeroing overrunning drive device; Figure 8 This is a front view of the drive shaft in a resolver zeroing overdrive device. Figure 9 A schematic diagram of the drive shaft side view in a resolver zeroing overdrive device. Figure 10 This is a top view schematic diagram of the drive shaft in a rotary converter zeroing overdrive device.

[0018] In the diagram: 1. Lifting ring; 2. Motor cover; 3. Motor sleeve; 4. DC brushless motor; 5. Handle; 6. Overrunning drive device; 6.1. Drive sleeve; 6.2. Overrunning bearing; 6.3. Drive shaft; 6.4. Upper ball bearing; 6.5. Lower ball bearing; 7. Screwdriver bit. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1 to 10 As shown, the present invention provides a drive motor resolver zeroing overrunning drive device, including a motor sleeve 3, with handles 5 fixedly installed on both sides of the middle of the surface of the motor sleeve 3, a motor cover 2 and an overrunning drive device 6 respectively provided on the top and bottom of the motor sleeve 3, a lifting ring 1 fixedly installed on the middle of the top of the motor cover 2, a DC brushless motor 4 fixedly installed inside the motor sleeve 3, and a screwdriver bit 7 provided on the bottom of the overrunning drive device 6. The overrunning drive device 6 includes a drive sleeve 6.1, a drive shaft 6.3 is provided at the upper end of the drive sleeve 6.1, an overrunning bearing 6.2 is movably engaged at the upper end of the surface of the drive shaft 6.3, an upper ball bearing 6.4 and a lower ball bearing 6.5 are respectively engaged at the middle and lower ends of the surface of the drive shaft 6.3, the output shaft of the DC brushless motor 4 is fixedly installed with the drive shaft 6.3, and the interior of the drive shaft 6.3 is fixedly installed with the top of the bit 7.

[0021] With the development of electric drive systems, the resolver software zeroing method is becoming increasingly suitable for actual production needs, which will be further explained below: The resolver mechanical zeroing scheme consists of a high-voltage distribution cabinet, a controller (for testing, hereinafter referred to as the controller), the drive motor assembly under test, and a host computer. The high-voltage distribution cabinet outputs high-voltage DC power to the controller (for testing), which is not assembled or operated with the actual motor. Based on control commands issued by the host computer program, the controller outputs three-phase AC power to the drive motor assembly under test. At this point, the drive motor assembly includes the drive motor and the resolver transformer. The resolver transformer transmits the collected signals back to the host computer via the controller, forming a closed-loop control. This scheme requires manual operation, resulting in large resolver zeroing errors and low production efficiency under batch conditions. The test controller also has poor compatibility with other motor models, high overall equipment investment costs, and significant risks for operators during actual operation. These issues make it unsuitable for the long-term development needs of electric drive systems.

[0022] The resolver software zeroing solution consists of an overrunning drive, the drive motor assembly under test, and a resolver tester. The operator first establishes communication connections between the resolver tester and both the drive motor and the resolver transformer. Then, the overrunning drive drives the rotor assembly, overcoming the attraction and friction of the rotor assembly's magnets, rotating it at a constant speed and time. The resolver tester then detects the waveforms of the drive motor and resolver transformer windings, outputting the relative position parameters between the stator and rotor of the drive motor. Subsequently, a controller is installed, and the position parameters, along with other control programs, are burned into the controller's ROM chip, completing the resolver software zeroing. This solution eliminates the need for a high-voltage distribution cabinet and a test controller, resulting in very low equipment investment costs. Under batch conditions, the resolver zeroing error is extremely small, production efficiency is high, and there is no bottleneck process affecting process balance. Operator safety is ensured because the solution lacks a controller; the resolver tester directly monitors the drive motor and resolver transformer, making it suitable for zeroing different motor models.

[0023] The overtaking drive unit mainly includes a motor cover, a motor sleeve, a brushless DC motor and control assembly, and an overtaking mechanism. The brushless DC motor and control assembly includes a DC power supply, control switches, time relays, a driver, a speed controller, forward / reverse control switches, and the brushless DC motor itself. The DC power supply outputs 24V DC power to the driver. The control switches and time relays control the timing of the 24V DC power connection and disconnection. The driver can invert single-phase 24V DC power into three-phase DC power for output to the brushless DC motor. Simultaneously, the driver provides a speed controller and forward / reverse control switches to control the direction and speed of the output power. The brushless DC motor, controlled by the control switches and driver, drives the rotor assembly to rotate. The rotor assembly has a no-load starting torque of 1–3 N·m, a selectable speed range of 100–200 rpm, a speed accuracy of ±10 rpm, and a constant speed running time of 3–5 seconds. Within this range, a resolver tester can stably monitor the sinusoidal waveform emitted by the drive motor and the resolver transformer windings.

[0024] The overrunning mechanism includes a drive sleeve, an overrunning bearing, a drive shaft, and upper and lower ball bearings. The power of the DC brushless motor is transmitted to the drive shaft through the motor shaft. Figure 5It can be seen that the motor shaft and drive shaft have a small clearance fit. A keyway is provided on the motor shaft, allowing power to be transmitted via a flat key. To prevent the drive shaft from accidentally dislodging, a set screw is installed on the drive shaft to lock it in place. An overrunning bearing and upper and lower ball bearings are press-fitted onto the drive shaft, secured with shaft retaining rings. The inner ring of the overrunning bearing has an interference fit with the drive shaft, and the outer ring has an interference fit with the drive sleeve, ensuring reliable power transmission. The inner rings of the upper and lower ball bearings have an interference fit with the drive shaft, and the outer rings have a small clearance fit with the drive sleeve, resolving assembly issues for the upper and lower ball bearings. At this point, the overrunning bearing directionally transmits the power from the drive shaft to the drive sleeve. Because the bit is rigidly connected to the drive sleeve, the power output from the DC brushless motor is ultimately transmitted to the rotor assembly through the bit, causing the rotor assembly to rotate at a constant speed and time, completing the resolver zeroing process. When the DC brushless motor is powered off, the rotor assembly will drag the screwdriver bit backward due to its own inertia. At this time, the unidirectional transmission of the overpass bearing solves the problem of the screwdriver bit dragging back and loosening the locking screws on the resolver rotor, thus systematically solving various problems that exist in the zeroing process of the resolver.

[0025] Among them, the overrunning bearing 6.2, the drive shaft 6.3, the upper ball bearing 6.4 and the lower ball bearing 6.5 are all located inside the drive sleeve 6.1, and there is a gap between the drive sleeve 6.1 and the bottom of the motor sleeve 3.

[0026] The drive sleeve 6.1 has annular grooves with gradually decreasing diameters and a cylindrical groove at the bottom. Multiple annular grooves form an annular groove group. The drive shaft 6.3 is located in the middle of the annular groove group. The overrunning bearing 6.2, the upper ball bearing 6.4, and the lower ball bearing 6.5 are respectively engaged between the drive shaft 6.3 and the annular groove group from top to bottom. The cylindrical groove is used to place the bit 7 structure.

[0027] The surface of the motor sleeve 3 is made of hard copper material, and heat sinks are evenly distributed on its surface.

[0028] This application also proposes a method for zero-adjustment overrunning drive of a resolver motor, the specific steps of which are as follows: S1 and lifting ring 1 can be used to connect to the hand chain hoist on the line. By adjusting the spring force of the hand chain hoist, the weight of the overdrive assembly can be balanced, making it convenient for the operator to operate freely. S2, motor sleeve 3 is used to install and store DC brushless motor 4. The overrunning drive device and the line are integrated by the lifting ring 1 on the motor cover 2. The handles 5 on both sides of the motor sleeve 3 are convenient for the operator to hold and operate. S3. The tested drive motor assembly is transferred to the resolver zeroing process along with the logistics pallet of the line. After the line is lifted and positioned, the tested drive motor assembly is fixed. The operator turns on the DC power supply to ensure that the 24V DC power is stably output to the driver. The power output state of the DC brushless motor 4 is set at one time through the speed controller and forward and reverse control switch. S4. The operator turns on the resolver tester and connects the UVW three-phase data cable and resolver data cable provided with the resolver tester to the drive motor and resolver transformer respectively. Pull the overrunning drive device off the hand chain hoist, align bit 7 with the resolver rotor locking screw drive head on the rotor assembly, and turn on the control switch on the overrunning drive device. Bit 7 drives the rotor assembly to rotate at a constant speed at a set time. The voltage sinusoidal waveform of the drive motor and resolver transformer windings changing with time can be read in real time on the resolver tester. Through the system's automatic calculation, the relative position parameters between the stator and rotor of the drive motor are output. The laser engraving machine engraves these parameters at the specified position on the drive motor housing, thus completing the resolver zeroing test of the drive motor. S5. The drive motor completes the installation of the remaining reducer and controller along with the production line. Before the assembly test, the mutual position parameters and other control programs are burned onto the controller ROM chip. The assembly performance test is started. The assembly bench performance test is completed according to the control program set by the host computer of the assembly test bench. Once the test is passed, the assembly can be taken off the production line, completing the assembly and testing of the entire electric drive system.

[0029] Among them, the resolver zeroing method is based on an overrunning drive device and a resolver tester, and uses software zeroing to complete the position calibration between the stator and rotor of the drive motor.

[0030] The overtaking drive unit has its own DC power supply, and its driving force comes from a brushless DC motor. The brushless DC motor realizes the adjustment or disconnection of the driving force through its matching control assembly. The overtaking drive unit includes an overtaking mechanism, which is rigidly connected to the brushless DC motor and selectively directs the power generated by the brushless DC motor to ensure that the power generated by the drive motor runs or disconnects in the required direction.

[0031] Among them, the resolver zeroing method is based on an overrunning drive device and a resolver tester, and uses software zeroing to complete the position calibration between the stator and rotor of the drive motor.

[0032] The controller incorporates resolver zeroing code during software compilation. By overtaking the drive device to drive the motor to rotate at a constant speed, and using a resolver tester to track and measure the respective operating waveforms of the drive motor and resolver transformer, the controller parametrically identifies the relative position parameters between the stator and rotor of the drive motor. By burning the position parameters along with other control programs onto the controller's ROM chip, the resolver zeroing of the drive motor can be solved.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for zero-adjustment overrunning drive of a resolver motor, characterized in that, The drive motor resolver zeroing overdrive device includes a motor sleeve (3), and handles (5) are fixedly installed on both sides of the middle part of the surface of the motor sleeve (3). The motor sleeve (3) is provided with a motor cover (2) and an overdrive device (6) from top to bottom. A lifting ring (1) is provided on the motor cover (2). A DC brushless motor (4) is provided inside the motor sleeve (3). The overrunning drive device (6) includes a drive sleeve (6.1) and a bit (7). The drive sleeve (6.1) has a drive shaft (6.3) inside. One end of the drive shaft (6.3) is movably engaged with an overrunning bearing (6.2). The other end of the drive shaft (6.3) is engaged with an upper ball bearing (6.4) and a lower ball bearing (6.5). The output shaft of the DC brushless motor (4) is fixedly connected to the drive shaft (6.3). The drive shaft (6.3) is fixedly connected to the bit (7). The overrunning bearing (6.2), drive shaft (6.3), upper ball bearing (6.4) and lower ball bearing (6.5) are all located inside the drive sleeve (6.1), and there is a gap between the drive sleeve (6.1) and the bottom of the motor sleeve (3); The specific steps are as follows: S1, the lifting ring (1) can be used to connect to the hand chain hoist on the line. By adjusting the spring force of the hand chain hoist, the weight of the super drive assembly can be balanced, making it convenient for the operator to operate freely. S2, the motor sleeve (3) is used to install and store the DC brushless motor (4). The overrunning drive device and the line are integrated by the lifting ring (1) on the motor cover (2). The handles (5) on both sides of the motor sleeve (3) are convenient for the operator to hold and operate. S3. The tested drive motor assembly is transferred to the resolver zeroing process along with the logistics pallet of the line. The line is lifted and positioned to fix the tested drive motor assembly. The operator turns on the DC power supply to ensure that the 24V DC power is stably output to the driver. The power output state of the DC brushless motor (4) is set at one time through the speed controller and forward / reverse control switch. S4. The operator turns on the resolver tester, connects the UVW three-phase data line and resolver data line of the resolver tester to the drive motor and resolver transformer respectively, pulls the overrunning drive device off the hand chain hoist, aligns the bit (7) with the resolver rotor locking screw drive head on the rotor assembly, turns on the control switch on the overrunning drive device, and the bit (7) drives the rotor assembly to rotate at a constant speed at a time. The voltage sinusoidal waveform of the drive motor and resolver transformer windings changing with time can be read on the resolver tester in real time. The system calculates and outputs the relative position parameters between the stator and rotor of the drive motor. The laser engraving machine engraves the parameters on the specified position of the drive motor housing, and the drive motor resolver zeroing test can be completed. S5. The drive motor completes the installation of the remaining reducer and controller along with the production line. Before the assembly test, the mutual position parameters and other control programs are burned into the controller ROM chip. The assembly performance test is started. The assembly bench performance test is completed according to the control program set by the host computer of the assembly test bench. Once the test is passed, the assembly can be taken off the production line, completing the assembly and testing of the entire electric drive system. The resolver zeroing method is based on an overrunning drive device and a resolver tester, and uses software zeroing to complete the position calibration between the stator and rotor of the drive motor.

2. The method for zeroing and overtaking drive of a drive motor with a resolver according to claim 1, characterized in that: The drive sleeve (6.1) has an annular groove with a gradually decreasing diameter and a cylindrical groove at the bottom. Multiple annular grooves form an annular groove group. The drive shaft (6.3) is located in the middle of the annular groove group. The overrunning bearing (6.2), the upper ball bearing (6.4), and the lower ball bearing (6.5) are respectively engaged between the drive shaft (6.3) and the annular groove group from top to bottom. The cylindrical groove is used to place the bit (7) structure.

3. The method for zeroing and overtaking drive of a drive motor with a resolver according to claim 1, characterized in that: The surface of the motor sleeve (3) is made of hard metal copper material, and heat sinks are uniformly arranged on its surface.

4. The method for zeroing and overtaking drive of a drive motor with a resolver according to claim 1, characterized in that: The overtaking drive unit has its own DC power supply, and its driving force comes from a DC brushless motor. The DC brushless motor realizes the adjustment or disconnection of the driving force through its matching control assembly. The overtaking drive unit includes an overtaking mechanism, which is rigidly connected to the DC brushless motor and selectively directs the power generated by the DC brushless motor to ensure that the power generated by the drive motor runs or disconnects in the required direction.

5. The method for zeroing and overtaking drive of a drive motor with a resolver according to claim 1, characterized in that: The resolver zeroing method is based on an overrunning drive device and a resolver tester, and uses software zeroing to complete the position calibration between the stator and rotor of the drive motor.

6. The method for zeroing and overtaking drive of a drive motor with a resolver according to claim 1, characterized in that: By adding resolver zeroing code during software compilation, the controller drives the motor to rotate at a constant speed through an overdrive device. The resolver tester tracks and measures the operating waveforms of the drive motor and the resolver transformer, thereby parametrically identifying the mutual position parameters between the stator and rotor of the drive motor. By burning the position parameters along with other control programs onto the controller's ROM chip, the resolver zeroing of the drive motor can be solved.

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