Stator winding electric heating system

Abstract

The utility model relates to the technical field of electric heating control, in particular to a stator winding electric heating system. The heating loop and the temperature feedback loop are connected with the industrial personal computer, and the heating loop comprises a direct current power supply, an IGBT inversion module, an electric slip ring assembly and a stator winding which are connected in sequence; the temperature feedback loop comprises two loops connected to the stator winding, namely a sensor temperature feedback loop and an electrical parameter temperature feedback loop, and the sensor temperature feedback loop comprises an infrared sensor connected to the stator winding; the electrical parameter temperature feedback loop comprises a multi-channel voltage measurement module which is connected to the stator winding through an electric slip ring assembly. The heating efficiency is high, the heating rate is convenient to control, the heating device is suitable for heating a three-phase winding, temperature feedback of a sensor can be separated in most of the time in the heating process, and the integration difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric heating control, in particular to a stator winding electric heating system. Background Art

[0002] The stator winding needs to be heated during the paint coating process. The current stator winding heating methods are divided into oven heating method, induction heating method, electric heating method, etc. according to the heating principle, and divided into infrared sensor method, resistance measurement method, and calculated resistance method according to the temperature control method. In actual applications, it is found that heating efficiency and temperature control accuracy are two important factors affecting the quality of painting. In terms of the influence of heating efficiency, if the heating is too slow, the heat will diffuse in the paint bucket, causing the paint liquid to deteriorate, reducing the quality of painting and the utilization rate of the paint liquid; if the heating is too slow, it will cause temperature overshoot and damage the insulation layer of the winding copper wire; in terms of the influence of temperature control accuracy, The more mainstream insulating paints include epoxy solvent-free insulating paint (epoxy paint for short) and unsaturated polyester insulating paint (polyester paint for short), both of which require heating and curing. The temperature conditions required for polyester paint are more stringent. Deviation from the temperature requirements will cause fluctuations in the quality of the paint. The general safe process requirements are within ±5°C. Since the stator needs to rotate and dip during the paint coating process, if the infrared sensor is required to continuously align with a certain point, the tooling design requirements are extremely high, and the temperature of the stator below the paint surface cannot be measured. If the sensor deviates from the stator position during the process, it will cause temperature feedback errors and temperature runaway, causing serious consequences. The resistance measurement method can avoid the risks of the infrared sensor method to a certain extent, but since the stator cannot be powered on during resistance measurement, if it is used in electric heating scenarios, it is necessary to frequently stop the power supply, affecting the heating efficiency.

[0003] Therefore, it is necessary to develop a stator winding heating system with controllable heating speed and high temperature control accuracy to solve the problems existing in the prior art. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a stator winding electric heating system.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A stator winding electric heating system includes an industrial computer, and a heating circuit and a temperature feedback circuit connected to the industrial computer, wherein:

[0007] The heating circuit includes a DC power supply, an IGBT inverter module, an electric slip ring assembly and a stator winding which are connected in sequence; the DC power supply converts the DC power into AC power through the IGBT inverter module and transmits the AC power to the stator winding through the electric slip ring assembly;

[0008] The temperature feedback loop includes two loops connected to the stator winding: a sensor temperature feedback loop and an electrical parameter temperature feedback loop, wherein:

[0009] a sensor temperature feedback loop including an infrared sensor connected to the stator winding;

[0010] A temperature feedback loop of electrical parameters, comprising a multi-channel voltage measurement module connected to the stator winding via an electrical slip ring assembly;

[0011] In addition, the infrared sensor and the multi-channel voltage measurement module are connected to the industrial computer respectively.

[0012] This technical solution achieves precise control of the stator winding heating process through closed-loop control and temperature feedback of two loops, thereby improving the safety and reliability of the system. Specifically, the industrial computer adjusts the power of the heating loop according to the temperature of the stator winding to maintain the stator winding within a specific temperature range; the infrared sensor and the multi-channel voltage measurement module provide two temperature feedback mechanisms, which together ensure accurate perception and rapid response to the stator winding temperature; by adjusting the output of the heating loop in real time, it responds quickly when the stator winding is overheated or overcooled, ensuring that the stator winding always operates within the optimal temperature range.

[0013] In addition, the stator winding electric heating system proposed in the utility model may also have the following additional technical features:

[0014] According to an embodiment of the utility model, the infrared sensor is fixed on the tooling bracket, is aligned with the stator when the stator temperature needs to be measured, and is connected to the industrial computer through a serial port.

[0015] In this technical solution, the tooling bracket provides a stable installation platform for the infrared sensor, ensuring that the sensor can be accurately aligned with the stator, thereby obtaining accurate temperature data; the infrared sensor is installed on the stator winding to monitor the temperature of the stator winding in real time.

[0016] According to an embodiment of the utility model, the electric slip ring assembly is fixed on the tooling bracket, and includes a busbar electric slip ring and a sampling electric slip ring; one end of the busbar electric slip ring is connected to the output end of the IGBT inverter module, and the other end of the busbar electric slip ring is connected to the stator winding; one end of the sampling electric slip ring is connected to the multi-channel voltage measurement module, and the other end of the sampling electric slip ring is connected to the stator winding.

[0017] This technical solution establishes an electrical connection between the stator winding and the stationary parts by means of sliding contact, so as to realize the transmission of electric energy and the monitoring of signals. Specifically, the busbar electric slip ring is used to transmit high current to drive the stator winding, one end of which is connected to the output end of the IGBT inverter module, and the other end is directly connected to the stator winding; after the IGBT inverter module converts the direct current into alternating current, the busbar electric slip ring is responsible for safely and reliably transmitting these currents to the stator winding, thereby heating the stator; the sampling electric slip ring is used to transmit low current signals, especially the signals from the stator winding to the multi-channel voltage measurement module, the signals include parameters such as temperature, voltage, and current, and are used to monitor the working status of the stator winding; one end of the sampling electric slip ring is connected to the multi-channel voltage measurement module, and the other end is connected to the stator winding to ensure that these signals can be transmitted accurately and without interference. By fixing the electric slip ring assembly on the tooling bracket, it can be easily installed, debugged and maintained.

[0018] According to one embodiment of the utility model, the industrial computer is electrically connected to the temperature sensor via RS232 bus I, and the temperature sensor is aligned with the stator winding to form a temperature feedback loop of the sensor; the industrial computer is connected to the DC power supply via RS232 bus II, and the industrial computer is connected to the multi-channel voltage measurement module via LAN bus II, and the multi-channel voltage measurement module is electrically connected to the stator winding via an electric slip ring to form a temperature feedback loop of the electrical parameters.

[0019] In this technical solution, the temperature sensor is aligned with the stator winding to measure the temperature of the stator winding in real time; the temperature sensor is electrically connected to the industrial computer through RS232 bus I and sends the temperature data to the industrial computer; after receiving the temperature data, the industrial computer can understand the temperature state of the stator winding in real time and adjust the heating or cooling strategy as needed; the industrial computer and the DC power supply are connected through RS232 bus II to realize the control and monitoring of the power supply, and control instructions are sent to the DC power supply through RS232 bus II, such as adjusting the output voltage, current and other parameters to meet the heating requirements of the stator winding. The DC power supply can also feed back its own working status information (such as output voltage, current, temperature, etc.) to the industrial computer through RS232 bus II for the industrial computer to monitor and diagnose faults; the industrial computer and the multi-channel The multi-channel voltage measurement modules are connected through LAN bus II to achieve high-speed and stable data transmission. The industrial computer receives the stator winding voltage data sent by the multi-channel voltage measurement module through LAN bus II, and then analyzes the electrical parameter state of the stator winding; the multi-channel voltage measurement module is electrically connected to the stator winding through the electric slip ring to measure the voltage of the stator winding in real time; while the stator winding rotates, the electric slip ring maintains a stable connection with the multi-channel voltage measurement module to ensure accurate transmission of voltage data; the multi-channel voltage measurement module sends the measured voltage data to the industrial computer through LAN bus II to form a temperature feedback loop of electrical parameters; based on the received voltage data, the industrial computer can analyze the electrical parameter state of the stator winding, such as resistance, power, etc., and then determine the temperature state or potential fault of the stator winding.

[0020] According to an embodiment of the utility model, the system further comprises an IGBT drive module, the industrial computer is connected to the IGBT drive module via LAN bus I, the IGBT drive module is connected to the input end of the IGBT inverter module; the IGBT inverter module performs cyclic heating on the stator winding via high-speed switching, and the cyclic state composition is as follows:

[0021] UV / UW-V / WV / W-VU / WU / VW-U / VU / V-UW / VW / UV-W / UW / U-VW / UV

[0022] UV means that the current flows in from the U phase terminal and out from the V phase terminal, UW-V means that the current flows in from the UW terminal and out from the V terminal, and the same applies to the other states.

[0023] In this technical solution, the IGBT drive module receives control signals from the industrial computer and converts these signals into signals that can drive the IGBT inverter module to work; by accurately controlling the on and off time of the IGBT, the IGBT drive module can achieve precise control of the stator winding heating process. The stator winding is composed of multi-phase windings (such as U, V, and W three-phases). The IGBT inverter module generates a circulating current path between different phases of the stator winding through high-speed switching. These circulating states (such as UV, UW-V, etc.) ensure that the stator winding can be heated evenly, avoiding local overheating or uneven temperature problems; by accurately controlling the switching frequency and current size of the IGBT inverter module, the stator winding heating process can be precisely controlled to meet different heating requirements.

[0024] According to an embodiment of the utility model, the system further includes a cabinet, in which a DC power supply, a multi-channel voltage measurement module, an IGBT inverter module, an IGBT drive module, and an industrial computer are arranged.

[0025] In the technical solution, the cabinet is a rectangular frame, and a tooling bracket is provided inside the cabinet for fixing the DC power supply, multi-channel voltage measurement module, IGBT inverter module, IGBT drive module, and industrial computer located therein.

[0026] Compared with the prior art, the utility model has the following beneficial effects:

[0027] (1) The DC power supply uses constant current output, and the current is circulated into the stator winding through inverter switching. The current is uninterrupted during the process, which improves the heating efficiency;

[0028] (2) The winding resistance is obtained by sampling the voltage / output current, and the temperature is obtained indirectly through the winding resistance. This allows the real-time temperature to be obtained without infrared sensor measurement during most of the heating and temperature maintenance time. There is no need to design complex tooling for the infrared sensor to ensure that it is always aligned with a certain position on the stator during the paint dripping process. This also avoids the risk of temperature deviation due to inaccurate infrared sensor alignment.

[0029] (3) High efficiency and convenient control of heating rate. It is suitable for heating three-phase windings. During the heating process, the temperature can be separated from the sensor feedback temperature for most of the time, which reduces the difficulty of integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a block diagram of the electric heating system of the utility model.

[0031] Figure 2 It is an electrical diagram of the switching logic and sequence of the utility model.

[0032] In the figure: 1. Industrial computer; 2. RS232 bus I; 3. Infrared sensor; 4. Stator winding; 5. Bus slip ring; 6. Sampling slip ring; 7. RS232 bus II; 8. DC power supply; 9. LAN bus I; 10. IGBT drive module; 11. IGBT inverter; 12. LAN bus II; 13. Multi-channel voltage measurement module. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] Example 1

[0035] like Figure 1 and Figure 2 As shown, this embodiment provides a stator winding electric heating system, including an industrial computer 1, and a heating circuit and a temperature feedback circuit connected to the industrial computer 1, wherein:

[0036] The heating circuit includes a DC power supply 8, an IGBT inverter module, an electric slip ring assembly and a stator winding 4 which are connected in sequence; the DC power supply 8 converts DC power into AC power through the IGBT inverter module and transmits the AC power to the stator winding 4 through the electric slip ring assembly;

[0037] The temperature feedback loop includes two loops connected to the stator winding 4: a sensor temperature feedback loop and an electrical parameter temperature feedback loop, wherein:

[0038] A sensor temperature feedback loop includes an infrared sensor 3 connected to a stator winding 4;

[0039] The temperature feedback loop of the electrical parameters comprises a multi-channel voltage measurement module 13 connected to the stator winding 4 via an electrical slip ring assembly;

[0040] In addition, the infrared sensor 3 and the multi-channel voltage measurement module 13 are connected to the industrial computer 1 respectively.

[0041] like Figure 1 and Figure 2As shown, the technical solution realizes precise control of the heating process of the stator winding 4 through closed-loop control and temperature feedback of two loops, thereby improving the safety and reliability of the system. Specifically, the industrial computer 1 adjusts the electric energy of the heating loop according to the temperature of the stator winding 4 to maintain the stator winding 4 within a specific temperature range; the infrared sensor 3 and the multi-channel voltage measurement module 13 provide two temperature feedback mechanisms, which together ensure accurate perception and rapid response to the temperature of the stator winding 4; by adjusting the output of the heating loop in real time, it responds quickly when the stator winding 4 is overheated or overcooled, ensuring that the stator winding 4 always works within the optimal temperature range.

[0042] In addition, the stator winding electric heating system proposed in the utility model may also have the following additional technical features:

[0043] According to an embodiment of the present utility model, the infrared sensor 3 is fixed on a tooling bracket, is aligned with the stator when the stator temperature needs to be measured, and is connected to the industrial computer 1 through a serial port.

[0044] In this technical solution, the tooling bracket provides a stable installation platform for the infrared sensor 3, ensuring that the sensor can be accurately aligned with the stator, thereby obtaining accurate temperature data; the infrared sensor 3 is installed on the stator winding 4 to monitor the temperature of the stator winding 4 in real time.

[0045] According to an embodiment of the utility model, the electric slip ring assembly is fixed on the tooling bracket, and includes a busbar electric slip ring 5 and a sampling electric slip ring 6; one end of the busbar electric slip ring 5 is connected to the output end of the IGBT inverter module, and the other end of the busbar electric slip ring 5 is connected to the stator winding 4; one end of the sampling electric slip ring 6 is connected to the multi-channel voltage measurement module 13, and the other end of the sampling electric slip ring 6 is connected to the stator winding 4.

[0046] This technical solution establishes an electrical connection between the stator winding 4 and the stationary parts by means of sliding contact, so as to realize the transmission of electric energy and the monitoring of signals. Specifically, the busbar electric slip ring 5 is used to transmit high current to drive the stator winding 4, one end of which is connected to the output end of the IGBT inverter module, and the other end is directly connected to the stator winding 4; after the IGBT inverter module converts the direct current into alternating current, the busbar electric slip ring 5 is responsible for safely and reliably transmitting these currents to the stator winding 4, thereby heating the stator; the sampling electric slip ring 6 is used to transmit low current signals, especially signals from the stator winding 4 to the multi-channel voltage measurement module 13, the signals include parameters such as temperature, voltage, and current, and are used to monitor the working state of the stator winding 4; one end of the sampling electric slip ring 6 is connected to the multi-channel voltage measurement module 13, and the other end is connected to the stator winding 4, so as to ensure that these signals can be transmitted accurately and without interference. By fixing the electric slip ring assembly on the tooling bracket, it can be easily installed, debugged and maintained.

[0047] According to one embodiment of the utility model, the industrial computer 1 is electrically connected to the temperature sensor via the RS232 bus Ⅰ2, and the temperature sensor is aligned with the stator winding 4 to form a temperature feedback loop of the sensor; the industrial computer 1 is connected to the DC power supply 8 via the RS232 bus Ⅱ7, and the industrial computer 1 is connected to the multi-channel voltage measurement module 13 via the LAN bus Ⅱ12, and the multi-channel voltage measurement module 13 is electrically connected to the stator winding 4 via an electric slip ring to form a temperature feedback loop of the electrical parameters.

[0048] In the present technical solution, the temperature sensor is aligned with the stator winding 4 to measure the temperature of the stator winding 4 in real time; the temperature sensor is electrically connected to the industrial computer 1 through the RS232 bus Ⅰ2 and sends the temperature data to the industrial computer 1; after receiving the temperature data, the industrial computer 1 can understand the temperature state of the stator winding 4 in real time and adjust the heating or cooling strategy as needed; the industrial computer 1 and the DC power supply 8 are connected through the RS232 bus Ⅱ7 to realize the control and monitoring of the power supply, and control instructions are sent to the DC power supply 8 through the RS232 bus Ⅱ7, such as adjusting the output voltage, current and other parameters to meet the heating requirements of the stator winding 4. The DC power supply 8 can also feed back its own working status information (such as output voltage, current, temperature, etc.) to the industrial computer 1 through the RS232 bus Ⅱ7 for the industrial computer 1 to monitor and diagnose faults; the industrial computer 1 and the multi-channel voltage measurement The measurement modules 13 are connected through the LAN bus II 12 to achieve high-speed and stable data transmission. The industrial computer 1 receives the stator winding 4 voltage data sent by the multi-channel voltage measurement module 13 through the LAN bus II 12, and then analyzes the electrical parameter state of the stator winding 4; the multi-channel voltage measurement module 13 is electrically connected to the stator winding 4 through the electric slip ring, and measures the voltage of the stator winding 4 in real time; while the stator winding 4 rotates, the electric slip ring maintains a stable connection with the multi-channel voltage measurement module 13 to ensure accurate transmission of voltage data; the multi-channel voltage measurement module 13 sends the measured voltage data to the industrial computer 1 through the LAN bus II 12 to form a temperature feedback loop of electrical parameters; the industrial computer 1 can analyze the electrical parameter state of the stator winding 4, such as resistance, power, etc., according to the received voltage data, and then judge the temperature state or potential fault of the stator winding 4.

[0049] like Figure 2 As shown, the system further includes an IGBT drive module 10, the industrial computer 1 is connected to the IGBT drive module 10 via the LAN bus I9, and the IGBT drive module 10 is connected to the input end of the IGBT inverter module; the IGBT inverter module performs cyclic heating on the stator winding 4 through high-speed switching, and the cyclic state composition is as follows:

[0050] UV / UW-V / WV / W-VU / WU / VW-U / VU / V-UW / VW / UV-W / UW / U-VW / UV

[0051] UV means that the current flows in from the U-phase terminal and out from the V-phase terminal, and UW-V means that the current flows in from the UW terminal and out from the V terminal, and the same applies to the other states. The advantage of this switching method is that it ensures the constant current output of the power supply to improve the heating efficiency, and at the same time ensures that there will be no voltage mutation during the output process to avoid IGBT damage.

[0052] The temperature feedback of the stator winding 4 is obtained indirectly by the winding resistance. To obtain the temperature from the resistance, the material temperature coefficient a, the initial winding temperature T0 and the initial winding resistance R0 must be known in advance. The material coefficient is obtained as follows: for stators of the same specification, the material temperature coefficient a is obtained by fitting the RT curve points when the first stator produced by the production line is heated, the resistance R is obtained by calculation, and the temperature T is measured by the infrared sensor 3 (the material temperature coefficient used for the actual calculation of the temperature may not be consistent with the material temperature coefficient of the winding material, and the fitting result shall prevail); the initial winding temperature T0 is obtained by the infrared sensor 3; the initial resistance R0 is obtained by calculation.

[0053] During heating, the resistance value is calculated by the voltage across the winding and the current passing through the winding. The voltage sampling across the winding is measured by the multi-channel voltage sampling module, and the current passing through the winding is obtained by reading the output current of the DC power supply 8. The current resistance of the winding is calculated by using the winding voltage and current in a certain state, and the current temperature of the winding is calculated by combining the material coefficient, the initial winding temperature and the resistance value.

[0054] In this technical solution, the IGBT drive module 10 receives control signals from the industrial computer 1 and converts these signals into signals that can drive the IGBT inverter module to work; by accurately controlling the on and off time of the IGBT, the IGBT drive module 10 can achieve accurate control of the heating process of the stator winding 4. The stator winding 4 is composed of multi-phase windings (such as three-phase U, V, and W). The IGBT inverter module generates a circulating current path between different phases of the stator winding 4 through high-speed switching. These circulating states (such as UV, UW-V, etc.) ensure that the stator winding 4 can be heated evenly, avoiding local overheating or uneven temperature problems; by accurately controlling the switching frequency and current size of the IGBT inverter module, accurate control of the heating process of the stator winding 4 can be achieved, thereby meeting different heating requirements.

[0055] According to an embodiment of the present utility model, the system further comprises a cabinet, in which a DC power supply 8, a multi-channel voltage measurement module 13, an IGBT inverter module, an IGBT drive module 10, and an industrial computer 1 are arranged.

[0056] In the present technical solution, the cabinet is a rectangular frame, and a tooling bracket is provided inside the cabinet for fixing the DC power supply 8, the multi-channel voltage measurement module 13, the IGBT inverter module, the IGBT drive module 10, and the industrial computer 1 therein.

[0057] The usage process of the above embodiment is as follows:

[0058] The infrared sensor 3 is fixed on the tooling bracket, aligned with the stator winding 4 in real time, and sends the measured temperature data to the industrial computer 1 through the serial port connection; the multi-channel voltage measurement module 13 is connected to the stator winding 4 through the electric slip ring assembly, measures the voltage of the stator winding 4 in real time, and sends these data to the industrial computer 1 through the LAN bus II 12; the industrial computer 1 receives the temperature and voltage data from the infrared sensor 3 and the multi-channel voltage measurement module 13; based on the temperature data and voltage data, the industrial computer 1 can calculate the actual temperature state of the stator winding 4 and compare it with the preset temperature range; if the temperature of the stator winding 4 is lower than or equal to 0.03°C ... If the voltage is higher than the preset range, the industrial computer 1 will send a control instruction to the IGBT drive module 10 through the LAN bus Ⅰ9 to adjust the working state of the IGBT inverter module, thereby changing the heating power of the stator winding 4; the DC power supply 8 converts the DC power into AC power through the IGBT inverter module, and transmits the electric energy to the stator winding 4 through the bus electric slip ring 5 to heat the stator winding 4; the IGBT inverter module switches at high speed and performs cyclic heating on the stator winding 4 according to the preset cycle state (such as UV / UW-V / WV / , etc.) to ensure that the stator winding 4 is evenly heated; the entire heating process is a closed-loop control system. The industrial computer 1 continuously adjusts the power output of the heating circuit according to the temperature and voltage data received in real time to maintain the stator winding 4 within a specific temperature range; if the stator winding 4 is overheated or overcooled, the industrial computer 1 will respond quickly by adjusting the output of the IGBT inverter module to ensure that the stator winding 4 always operates within the optimal temperature range; by real-time monitoring of the temperature and voltage data of the stator winding 4, the industrial computer 1 can promptly detect potential faults or abnormal conditions and take corresponding measures to deal with them.

[0059] It should be noted that the algorithm used by the industrial computer 1 to perform calculations after collecting data belongs to conventional technical means, and the improvement of the present utility model is only in the hardware.

[0060] Although the utility model is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the utility model is not limited thereto. Without departing from the spirit and essence of the utility model, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the utility model, and these modifications or substitutions shall be within the scope of the utility model / any person of ordinary skill in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the utility model, and they shall be within the scope of protection of the utility model. Therefore, the scope of protection of the utility model shall be based on the scope of protection of the claims.

Claims

1. A stator winding electric heating system, characterized in that: It comprises an industrial computer (1), and a heating circuit and a temperature feedback circuit connected to the industrial computer (1), wherein: The heating circuit comprises a DC power supply (8), an IGBT inverter module, an electric slip ring assembly and a stator winding (4) which are connected in sequence; the DC power supply (8) converts DC power into AC power through the IGBT inverter module and transmits the AC power to the stator winding (4) through the electric slip ring assembly; The temperature feedback loop includes two loops connected to the stator winding (4): a sensor temperature feedback loop and an electrical parameter temperature feedback loop, wherein: A sensor temperature feedback loop includes an infrared sensor (3) connected to a stator winding (4); A temperature feedback loop for electrical parameters, comprising a multi-channel voltage measurement module (13) connected to a stator winding (4) via an electrical slip ring assembly; In addition, the infrared sensor (3) and the multi-channel voltage measurement module (13) are respectively connected to the industrial computer (1).

2. The stator winding electric heating system according to claim 1, characterized in that: The infrared sensor (3) is fixed on a tooling bracket, is aligned with the stator when the stator temperature needs to be measured, and is connected to the industrial control computer (1) via a serial port.

3. The stator winding electric heating system according to claim 1 or 2, characterized in that: The electric slip ring assembly is fixed on a tooling bracket, and comprises a busbar electric slip ring (5) and a sampling electric slip ring (6); one end of the busbar electric slip ring (5) is connected to the output end of the IGBT inverter module, and the other end of the busbar electric slip ring (5) is connected to the stator winding (4); one end of the sampling electric slip ring (6) is connected to the multi-channel voltage measurement module (13), and the other end of the sampling electric slip ring (6) is connected to the stator winding (4).

4. The stator winding electric heating system according to claim 3, characterized in that: The industrial computer (1) is electrically connected to a temperature sensor via an RS232 bus I (2), and the temperature sensor is aligned with the stator winding (4) to form a temperature feedback loop of the sensor; the industrial computer (1) is connected to a DC power supply (8) via an RS232 bus II (7), the industrial computer (1) is connected to a multi-channel voltage measurement module (13) via a LAN bus II (12), and the multi-channel voltage measurement module (13) is electrically connected to the stator winding (4) via an electric slip ring to form a temperature feedback loop of an electrical parameter.

5. The stator winding electric heating system according to claim 1, characterized in that: The system further comprises an IGBT drive module (10), the industrial computer (1) is connected to the IGBT drive module (10) via a LAN bus I (9), and the IGBT drive module (10) is connected to an input end of an IGBT inverter module; the IGBT inverter module performs cyclic heating on the stator winding (4) via high-speed switching, and the cyclic state is composed of: UV / UW-V / WV / W-VU / WU / VW-U / VU / V-UW / VW / UV-W / UW / U-VW / UV UV means that the current flows in from the U phase terminal and out from the V phase terminal, UW-V means that the current flows in from the UW terminal and out from the V terminal, and the same applies to the other states.

6. The stator winding electric heating system according to claim 5, characterized in that: The system also includes a cabinet, in which a direct current power supply (8), a multi-channel voltage measurement module (13), an IGBT inverter module, an IGBT drive module (10), and an industrial computer (1) are arranged.

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