Self-adaptive heating equipment and heating method for motor stator winding

Abstract

The invention discloses motor stator winding self-adaptive heating equipment and a heating method, and belongs to the technical field of heating equipment, the motor stator winding self-adaptive heating equipment comprises an equipment support, a cantilever control box, a motor stator, a thermocouple, a clamping jaw cylinder, a stator clamping jaw, an electric appliance box and a direct current stabilized power supply; the thermocouple is arranged above the stator clamping jaw and is used for detecting the temperature of the motor stator in real time, converting a temperature signal into an electric signal and sending the electric signal to the single chip microcomputer of the electrical box, the actual required current value is obtained through PID adjustment and comparison of the single chip microcomputer, and the required current is provided by the direct-current stabilized power supply; the single-chip microcomputer outputs PWM signals to a control module of the insulated gate bipolar transistor at the same time to control the time proportion of connection and disconnection of the insulated gate bipolar transistor, direct current is converted into three-phase power to be provided for a motor stator 3, and finally automatic heating of a stator coil and real-time adjustment of the temperature are achieved. The heating device and method belong to an internal heating mode, a stator coil is directly electrified, resistance heating of a coil wire is utilized, and a three-phase high-frequency current is applied to the stator coil, so that the coil is electrified and self-heated.

Description

Technical Field

[0001] The invention relates to a motor stator winding adaptive heating device and a heating method. Background Art

[0002] Before the stator of the new energy vehicle motor is insulated by dripping paint, the stator needs to be preheated, and the preheating temperature is required to be around 90℃ to 100℃. There are several previous preheating methods, which generally rely on external heat sources to heat the workpiece, including electric blast furnace heating, infrared bulbs, iodine tungsten lamps, electric heating plate tube heating, etc. These methods are simple and easy to implement, but they have problems such as low heating efficiency, high power consumption, low temperature control accuracy, expensive equipment, large equipment size and floor space, complex structure, difficulty in automatic temperature measurement, and uneven local heating. Summary of the invention

[0003] In view of the problems existing in the prior art such as low heating efficiency, high power consumption, low temperature control accuracy, expensive equipment, large equipment size and floor space, complex structure, difficulty in automatic temperature measurement and uneven local heating, the present invention provides a motor stator winding adaptive heating device and heating method. The heating device and method belong to the internal heating mode, which directly energizes the stator coil, utilizes the resistance of the coil wire to generate heat, and applies three-phase high-frequency current to the stator coil so that the coil is energized and self-heated.

[0004] The present invention is achieved through the following technical solutions:

[0005] A motor stator winding adaptive heating device, comprising an equipment support 1, a cantilever control box 2, a motor stator 3, a thermocouple 4, a clamping claw cylinder 5, a stator clamping claw 6, an electrical box 7 and a DC stabilized power supply 8; the cantilever control box 2 is fixed on the equipment support 1, the upper layer of the equipment support 1 is provided with a stator clamping claw 6, and the lower layer is provided with an electrical box 7 and a DC stabilized power supply 8; the stator clamping claw 6 is connected to the clamping claw cylinder 5, the clamping claw cylinder 5 drives the stator clamping claw 6 to clamp the motor stator 3 to be heated delivered by the robot, the clamping claw cylinder 5 is connected to the single chip microcomputer 10 of the electrical box 7, the thermocouple 4 It is arranged above the stator clamp 6, and is used to detect the temperature of the motor stator 3 in real time, and convert the temperature signal into an electrical signal and send it to the single-chip microcomputer 10 of the electrical box 7. After the single-chip microcomputer PID adjustment and comparison, the actual required current value is obtained, and the required current is provided by the DC regulated power supply 8; the single-chip microcomputer 10 simultaneously outputs a PWM signal to the control module of the insulated gate bipolar transistor (IGBT) to control the on and off time ratio of the insulated gate bipolar transistor (IGBT), and converts the DC power into three-phase power to provide it to the motor stator 3, and finally realizes the automatic heating of the stator coil and the real-time adjustment of the temperature.

[0006] Furthermore, the cantilever control box 2 is provided with start, stop, emergency stop, stator clamp reset, temperature setting, temperature display and temperature recording functions.

[0007] Furthermore, the cantilever control box 2 is fixed on the equipment support 1 through a right-angle cantilever rod and a cantilever rod base, and the cantilever rod base can rotate 360 ​​degrees to facilitate operation by staff.

[0008] Furthermore, the electrical box 7 includes a control module 9 and a single-chip microcomputer 10. The single-chip microcomputer 10 is used to receive the temperature signal sent by the thermocouple 4 in real time, and perform PID feedback adjustment, compare and obtain the actual required current value, and the required current is provided by the DC regulated power supply 8; the single-chip microcomputer 10 simultaneously outputs a PWM signal to the control module 9 to control the on and off time ratio of the insulated gate bipolar transistor (IGBT), converts the DC power into three-phase power and provides it to the motor stator, and finally realizes automatic heating of the stator coil and real-time temperature adjustment.

[0009] Furthermore, there are three control modules 9 , which respectively control corresponding insulated gate bipolar transistors (IGBTs).

[0010] Furthermore, the electrical box 7 also includes a power switch 11 for controlling the 24V power supply and the DC regulated power supply 8.

[0011] On the other hand, the present invention also provides a heating method of a motor stator winding adaptive heating device, which specifically comprises the following steps:

[0012] Step 1: The stator clamp is driven by the clamp cylinder to clamp the motor stator to be heated delivered by the robot;

[0013] Step 2: Use thermocouples to detect the temperature of the motor stator to be heated in real time, and convert the temperature signal into an electrical signal and send it to the single-chip microcomputer; the single-chip microcomputer calculates the actual required current value through PID adjustment and compares it with the set temperature value, and sends it to the DC regulated power supply, which provides the required current;

[0014] Step 3: The single-chip microcomputer simultaneously outputs PWM signals to the control module to control the on-time ratio of the insulated gate bipolar transistor (IGBT), converts DC power into three-phase power and provides it to the motor stator. By controlling the current and frequency flowing through the coil, the instantaneous heat consumption of the coil is changed, so that the coil is energized and self-heated, realizing automatic heating of the stator coil and real-time temperature adjustment.

[0015] Furthermore, in step 2, the PID adjustment is specifically as follows:

[0016] Proportional kp = 20, integral ki = 3, differential kd = 1, the maximum value of PID output value output is 100. When the calculated PID is greater than 100, it is recorded as 100, and when it is less than 0, it is recorded as 0;

[0017] output=((Kp*error+Kd*derivative+Ki*integral);

[0018] Cur=output*Cur_max / 100

[0019] Among them, error represents the temperature difference between the set value and the current temperature, derivative represents the differential value, that is, the difference between the current error value and the previous error value, integral represents the integral value, that is, the sum of the previous eight error values, Cur represents the current value passed into the motor coil, and Cur_max represents the maximum current value.

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] The present invention discloses an adaptive heating device and method for a motor stator winding. The heating device and method belong to an internal heating mode. The stator coil is directly energized, and the resistance of the coil wire is used to generate heat. A three-phase high-frequency current is applied to the stator coil so that the coil is energized and self-heated. Compared with the existing heating furnace, the heating device has the characteristics of fast heating, precise temperature control, uniform heating, low energy consumption, and small size. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0023] Figure 1 It is a three-dimensional structural schematic diagram of a motor stator winding adaptive heating device of the present invention;

[0024] Figure 2 It is a three-dimensional structural schematic diagram of the electrical appliance box of the present invention;

[0025] Figure 3 This is a schematic diagram of the stator winding electric heating principle of the present invention;

[0026] Figure 4 This is the waveform diagram of "phase difference of 60 degrees between adjacent waveforms" at the output end;

[0027] In the figure: equipment bracket 1, cantilever control box 2, motor stator 3, thermocouple 4, gripper cylinder 5, stator gripper 6, electrical box 7, DC regulated power supply 8, control module 9, single chip microcomputer 10, power switch 11. DETAILED DESCRIPTION

[0028] In order to clearly and completely describe the technical solution and its specific working process of the present invention, the specific implementation methods of the present invention are as follows in conjunction with the accompanying drawings of the specification:

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0032] Example 1

[0033] like Figure 1As shown, this embodiment provides a motor stator winding adaptive heating device, including a device support 1, a cantilever control box 2, a motor stator 3, a thermocouple 4, a clamping cylinder 5, a stator clamp 6, an electrical box 7 and a DC stabilized power supply 8; the cantilever control box 2 is fixed on the device support 1, and the cantilever control box 2 is provided with functions such as start, stop, emergency stop, stator clamp 6 reset, temperature setting, temperature display, and temperature recording. The upper layer of the device support 1 is provided with a stator clamp 6, and the lower layer is provided with an electrical box 7 and a DC stabilized power supply 8; the stator clamp 6 is connected to the clamping cylinder 5, and the clamping cylinder 5 drives the stator clamp 6 to clamp the motor stator 3 to be heated sent by the robot, and the clamping cylinder 5 is connected to the single-chip microcomputer 10 of the electrical box 7, and the electrical box 7 includes an insulated gate bipolar transistor (IGBT) control module 9, a single-chip microcomputer 10, and a power switch 11 installed in the electrical box, and plays a protective role for the above-mentioned components. The thermocouple 4 is arranged above the stator clamp 6, and is used to detect the temperature of the motor stator 3 in real time, and convert the temperature signal into an electrical signal and send it to the single-chip microcomputer 10 of the electrical box 7. After PID adjustment and comparison, the actual required current value is obtained, and the required current is provided by the DC regulated power supply 8. The single-chip microcomputer 10 simultaneously outputs a PWM signal to the insulated gate bipolar transistor (IGBT) controller to control the on and off time ratio of the insulated gate bipolar transistor (IGBT), and converts the DC power into three-phase power to provide it to the motor stator. Finally, the automatic heating of the stator coil and the real-time adjustment of the temperature are realized.

[0034] In this embodiment, if Figure 2 As shown, the electrical box 7 includes an insulated gate bipolar transistor (IGBT) module 9 and a single-chip microcomputer 10. The single-chip microcomputer 10 is used to receive the temperature signal sent by the thermocouple 4 in real time and perform PID feedback regulation. After PID regulation and comparison, the actual required current value is obtained, and the required current is provided by the DC regulated power supply 8. The single-chip microcomputer 10 also outputs a PWM signal to the insulated gate bipolar transistor (IGBT) controller to control the on and off time ratio of the insulated gate bipolar transistor (IGBT), and converts the DC power into three-phase power to provide to the motor stator.

[0035] The electrical box 7 also includes a power switch 11 for controlling the 24V power supply and the DC regulated power supply 8.

[0036] In this embodiment, the DC regulated power supply adopts a high-precision adjustable DC regulated power supply (24V / 300A), and can output a continuously adjustable current through system adjustment as needed, so that the coil is powered on and self-heated to achieve different temperature control requirements.

[0037] In this embodiment, the single chip microcomputer is STM32, which is used to control the gripper cylinder and perform PID feedback adjustment on the thermocouple measurement value to obtain the actual required current value. At the same time, a PWM signal is output to the insulated gate bipolar transistor (IGBT) control module, which converts the DC power into three-phase power and provides it to the motor stator.

[0038] like Figure 3 As shown, the working principle of a motor stator winding adaptive heating device of this embodiment is as follows:

[0039] The stator clamp is driven by the cylinder to clamp the stator to be heated by the robot. According to the set temperature value, the motor stator is detected in real time through the thermocouple. The temperature signal is converted into an electrical signal and provided to the single-chip microcomputer. Through PID adjustment and comparison with the set temperature value, the actual required current is calculated, and the required current value is provided by the DC regulated power supply. The single-chip microcomputer simultaneously outputs a PWM signal to the insulated gate bipolar transistor (IGBT) controller to control the on and off time ratio of the insulated gate bipolar transistor (IGBT), and converts the DC power into three-phase power to provide it to the motor stator. The magnitude of the current value directly affects the temperature change of the coil, and indirectly causes the change of the coil resistance R. Through the feedback measurement of the temperature current, the current R is calculated, and the program-controlled current value is obtained. By controlling the magnitude of the current flowing through the coil, the magnitude of the instantaneous heat power consumption of the coil is changed, so that the coil is energized and self-heated. Automatic heating of the stator coil and real-time temperature adjustment are realized.

[0040] Example 2

[0041] This embodiment provides a heating method of a motor stator winding adaptive heating device, which specifically includes the following steps:

[0042] Step 1: The stator clamp is driven by the clamp cylinder to clamp the motor stator to be heated delivered by the robot;

[0043] Step 2: Use thermocouples to detect the temperature of the motor stator to be heated in real time, and convert the temperature signal into an electrical signal and send it to the single-chip microcomputer; the single-chip microcomputer calculates the actual required current value through PID adjustment and compares it with the set temperature value, and sends it to the DC regulated power supply, which provides the required current;

[0044] The PID adjustment is specifically as follows:

[0045] Proportional kp = 20, integral ki = 3, differential kd = 1, the maximum value of PID output value output is 100. When the calculated PID is greater than 100, it is recorded as 100, and when it is less than 0, it is recorded as 0;

[0046] output=((Kp*error+Kd*derivative+Ki*integral);

[0047] Cur=output*Cur_max / 100

[0048] Among them, error represents the temperature difference between the set value and the current value, derivative represents the differential value, that is, the difference between the current error value and the previous error value, integral represents the integral value, that is, the sum of the previous eight error values, Cur represents the current value passed into the motor coil, and Cur_max represents the maximum current value;

[0049] Step 3: The single-chip microcomputer simultaneously outputs PWM signals to the control module to control the on-time ratio of the insulated gate bipolar transistor (IGBT), converts DC power into three-phase power and provides it to the motor stator. By controlling the current and frequency flowing through the coil, the instantaneous heat consumption of the coil is changed, so that the coil is energized and self-heated, realizing automatic heating of the stator coil and real-time temperature adjustment.

[0050] Figure 4 This is the PWM waveform output by the microcontroller. The phase difference between adjacent PWM waveforms is 60°. After being amplified by the insulated gate bipolar transistor (IGBT) controller, the waveform can drive three dual-tube insulated gate bipolar transistors (IGBT) to convert DC power into three-phase power for the motor stator. A current of 200A can heat the motor coil to 100℃ in half an hour.

[0051] Table 1 is the experimental data table

[0052] Serial number Current (A) Temperature(℃) Time (min) 1 30 41 5 2 50 62 10 3 100 78 15 4 150 81 20 5 200 98 30 6 250 111 35

[0053] From the above test data, it can be seen that by changing the input stator winding current, the stator winding temperature can be changed, and the heating accuracy can reach + 2℃.

[0054] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0055] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0056] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A motor stator winding adaptive heating device, characterized in that: The invention comprises an equipment support (1), a cantilever control box (2), a motor stator (3), a thermocouple (4), a clamping claw cylinder (5), a stator clamping claw (6), an electrical box (7) and a DC regulated power supply (8); the cantilever control box (2) is fixed on the equipment support (1); the upper layer of the equipment support (1) is provided with a stator clamping claw (6); the lower layer is provided with an electrical box (7) and a DC regulated power supply (8); the stator clamping claw (6) is connected to the clamping claw cylinder (5); the clamping claw cylinder (5) drives the stator clamping claw (6) to clamp the motor stator (3) to be heated delivered by the robot; the clamping claw cylinder (5) and the single chip microcomputer (MCU) of the electrical box (7) are connected to each other. 10), the thermocouple (4) is arranged above the stator clamp (6) and is used to detect the temperature of the motor stator (3) in real time, and convert the temperature signal into an electrical signal and send it to the single-chip microcomputer (10) of the electrical box (7), and the actual required current value is obtained through PID adjustment and comparison of the single-chip microcomputer, and the required current is provided by the DC regulated power supply (8); the single-chip microcomputer (10) simultaneously outputs a PWM signal to the control module of the insulated gate bipolar transistor to control the on and off time ratio of the insulated gate bipolar transistor, converts the DC power into three-phase power and provides it to the motor stator (3), and finally realizes automatic heating of the stator coil and real-time temperature adjustment.

2. The motor stator winding adaptive heating device according to claim 1, characterized in that: The cantilever control box (2) is provided with the functions of starting, stopping, emergency stop, resetting of the stator clamp, temperature setting, temperature display and temperature recording.

3. The motor stator winding adaptive heating device according to claim 1, characterized in that: The cantilever control box (2) is fixed on the equipment support (1) via a right-angle cantilever rod and a cantilever rod base, and the cantilever rod base can rotate 360 ​​degrees, making it convenient for staff to operate.

4. The motor stator winding adaptive heating device according to claim 1, characterized in that: The electrical box (7) comprises a control module (9) and a single-chip microcomputer (10). The single-chip microcomputer (10) is used to receive the temperature signal sent by the thermocouple (4) in real time, and perform PID feedback adjustment to compare and obtain the actual required current value, and the DC voltage-stabilized power supply (8) provides the required current; the single-chip microcomputer (10) simultaneously outputs a PWM signal to the control module (9) to control the on-time ratio of the insulated gate bipolar transistor and the off-time ratio, converts the DC power into three-phase power and provides it to the motor stator, thereby finally realizing automatic heating of the stator coil and real-time temperature adjustment.

5. The motor stator winding adaptive heating device according to claim 4, characterized in that: The number of the control modules (9) is three, each of which controls a corresponding insulated gate bipolar transistor.

6. The motor stator winding adaptive heating device according to claim 4, characterized in that: The electrical box (7) also includes a power switch (11) for controlling the 24V power supply and the DC regulated power supply (8).

7. A heating method for a motor stator winding adaptive heating device as claimed in claim 1, characterized in that: The specific steps include: Step 1: The stator clamp is driven by the clamp cylinder to clamp the motor stator to be heated delivered by the robot; Step 2: Use thermocouples to detect the temperature of the motor stator to be heated in real time, and convert the temperature signal into an electrical signal and send it to the single-chip microcomputer; the single-chip microcomputer calculates the actual required current value through PID adjustment and compares it with the set temperature value, and sends it to the DC regulated power supply, which provides the required current; Step 3: The single-chip microcomputer simultaneously outputs PWM signals to the control module to control the on-time ratio of the insulated gate bipolar transistor, converts the DC power into three-phase power and provides it to the motor stator. By controlling the current and frequency flowing through the coil, the instantaneous heat consumption of the coil is changed, so that the coil is energized and self-heated, realizing automatic heating of the stator coil and real-time temperature adjustment.

8. A heating method for a motor stator winding adaptive heating device as claimed in claim 7, characterized in that: In step 2, the PID adjustment is specifically as follows: Proportional kp = 20, integral ki = 3, differential kd = 1, the maximum value of PID output value output is 100. When the calculated PID is greater than 100, it is recorded as 100, and when it is less than 0, it is recorded as 0; output=((Kp*error+Kd*derivative+Ki*integral); Cur=output*Cur_max / 100 Among them, error represents the temperature difference between the set value and the current temperature, derivative represents the differential value, that is, the difference between the current error value and the previous error value, integral represents the integral value, that is, the sum of the previous eight error values, Cur represents the current value passed into the motor coil, and Cur_max represents the maximum current value.

Images