Cooling fan control method and system of traction motor and freight train

[0052]Example one

[0053]Such asfigure 1 As shown, the cooling fan control method of the rail train traction motor of the present application embodiment includes the following steps:

[0054]Step S100: The central control unit acquires the status of the traction inverter, the state of the cooling fan and the cooling index information;

[0055]Step S200: Depending on the status of the traction inverter, the condition of the cooling fan, and the cooling indicator information, determine whether or not the cooling fan operation request is issued;

[0056]Wherein, the central control unit acquires the state of the traction inverter from the traction control unit, and acquires the condition of the cooling fan from the electrically switching of the cooling fan power line, and acquires the cooling index information from the system where the cooling indicator information acquisition device is located.

[0057]The control method of the rail train traction motor of the present application example is a single body, a central control unit CCU. The central control unit CCU obtains the state of the traction inverter from the traction control unit, and acquires the condition of the cooling fan from the electrically switching of the cooling fan power line, and acquires the cooling indicator information from the system where the cooling indicator information acquisition device is located. That is, the traction control unit transmits the state of the traction inverter directly to the central control unit, the electric switch of the cooling fan power supply line directs the state of the cooling fan to the central control unit, the system where the cooling indicator information acquisition device is located directly, the cooling indicator information is directly Send to the central control unit. Thereafter, the central control unit determines whether or not a cooling fan operation request is issued based on the state of the traction inverter, the state of the cooling fan and the cooling indicator information. Since the central control unit CCU is the brain of the train, the status data of all the systems of the train, the data information is comprehensive, including but not limited to the state of the traction inverter, the state of the cooling fan, and the cooling index information. The central control unit CCU directly utilizes the state of the traction inverter, the state of the cooling fan, and determines whether or not the cooling fan operation request is issued without the need for additional data transfer steps. The cooling fan running request is the basis for the control of the cooling fan. Therefore, the cooling fan control method of the rail train traction motor of the present application is determined whether or not the efficiency of the cooling fan operation request is high, the response is fast, provides the basis for the high efficiency and rapid response of the control of the cooling fan.

[0058]Specifically, the cooling index information includes, but is not limited to, the current speed of the train, the stator temperature of the traction motor, the temperature of the traction motor drives the bearing.

[0059]In implementation, such asfigure 2 As shown, the control method also includes the following steps:

[0060]Step 300: The central control unit acquires whether the secondary power supply system allows the cooling fan to start information, the state of the cooling fan;

[0061]Step S400: Whether the information of the cooling fan is allowed to activate, whether there is a cooling fan operation request, the condition of the cooling fan, and determines whether or not a cooling fan operation command is issued.

[0062]After the Central Control Unit CCU is issued to run the cooling fan, it is necessary to consider the situation of the rail train, and integrated whether or not the cooling fan operation instruction is issued, and the cooling fan operation command is used to implement the final control of the cooling fan. The situation in which the track train needs to be considered includes whether the auxiliary power supply system allows the cooling fan to start and cool the fan. Since the cooling fan belongs to a large power medium voltage, it is considered that its starting current is large, and cannot be started simultaneously with other high-power medium on the track train. It must rely on the central control unit CCU to accurately manage all medium pressure load on the track train. start up. The final control of the cooling fan cannot be achieved when there is a failure of the cooling fan. Therefore, depending on whether the auxiliary power supply system allows the cooling fan to start the information, there is a cooling fan operation request, the state of the cooling fan, determines whether or not a cooling fan operation command is issued. The control method of the cooling fan control method is high, and the response is fast.

[0063]In the implementation, the cooling fan can have two cooling methods: high speed air cooling and low speed air cooling. Correspondingly, the control of the cooling fan also includes operational control of high-speed air-cooled, and operating control of low-speed air cooling.

[0064]The operation control of high-speed air-cooled is as follows:

[0065]It is determined whether or not the cooling fan operation request is issued, including: determining whether or not a cooling fan is high-speed running request; it is determined whether or not the cooling fan operation command is issued, including: determining whether or not a cooling fan high speed operation command;

[0066]The operation control of low-speed air-cooled is as follows:

[0067]The step of judging whether or not the cooling fan is running, the specifically includes: determining whether or not a cooling fan is low-speed running request; it is determined whether or not the cooling fan operation command is issued, including: determining whether or not a cooling fan is low-speed operation instruction.

[0068]The high-speed air-cooled mode of the cooling fan is suitable for situations where the heat generated by the traction motor is large, and it is necessary to rapid heat dissipation; the low-speed air-cooled cooling method is suitable for the heat generated by the traction motor, and requires general heat dissipation. It is possible to save energy according to the heat generated by the traction motor.

[0069]The high-speed air-cooled operation control and the operational control of low-speed air-cooled operation will be described in detail below.

[0070]In the implementation, in the operating control of high-speed air-cooled, it is determined whether or not the cooling fan high-speed operation instruction is issued, including the following steps:

[0071]In the low-speed operation instruction without cooling fan, the auxiliary power supply system allows the cooling fan to start, with a cooling fan high-speed operation request, and the cooling fan is high-speed air-cooled, the cooling fan high-speed operation command is issued;

[0072]Among them, the cooling fan high-speed operation instruction is used to control the cooling fan for high-speed air cooling operation.

[0073]Other situations, the cooling fan high speed operation is not issued. For example, if there is a cooling fan low-speed operation instruction, the auxiliary power supply system does not allow cooling fan to start, no cooling fan high-speed operation request, cooling fan high-speed air cooling is faulty, any condition is satisfied, does not issue a cooling fan high-speed operation instruction.

[0074]The two cooling methods of the cooling fan is high-speed air-cooled and low-speed air cooling. Only one of the cooling methods can only be run. The cooling fan has failed, and the cooling fan cannot start the high-speed air cooling. In this way, when it is determined whether or not a cooling fan is running high-speed operation instruction, it is considered whether the cooling fan is faulty. When the cooling fan is faulty, the fan high-speed running instruction is not issued directly. Thus, when the cooling fan is issued, the chance of being performed by the cooling fan is greatly increased, and the accuracy of the control is high.

[0075]Determine a specific implementation process of the steps of the cooling fan high-speed operation instruction, such asimage 3 As shown, including:

[0076]Step S411: Judging whether there is a cooling fan low-speed operation instruction: there is a cooling fan low speed run command, then perform step S416; no cooling fan low speed operation command, then perform step S412;

[0077]Step S412: The auxiliary power supply system allows the cooling fan to start: The cooling fan is not allowed to start, then step S416 is performed; allowing the cooling fan to start, step S413 is performed;

[0078]Step S413: Judging whether there is a cooling fan high-speed run request: no cooling fan high-speed run request, then step S416 is executed; if there is a cooling fan high-speed run request, step S414 is executed;

[0079]Step S414: Whether there is a high-speed air open fault or high speed start fault: there is a high-speed air-opening fault or high speed start fault, then step S416 is executed; there is no high-speed air-opening fault or high speed failure, step S415 is executed; high-speed airfair or High-speed start fault, that is, the cooling fan is faulty, and it is unable to carry out high-speed air cooling. It is a condition of cooling fan.

[0080]Step S415: Send a cooling fan high-speed operation command;

[0081]Step S416: Do not issue a cooling fan high-speed operation command.

[0082]Among them, step S414 is to determine whether the cooling fan is high-speed air cooling, high-speed air-opening fault is a high-speed air-cooled power supply circuit of a cooling fan, and is in a closed vacant, in the case of disconnection; high-speed start fault is a high-speed air of the cooling fan. The relay of the cold power supply circuit cannot be applied. The high-speed air cooling of the cooling fan is faulty and / or high-speed startup faults and / or high-speed start.

[0083]In the implementation, in the operating control of low-speed air-cooled, it is determined whether or not a cooling fan is low-speed operation instruction, which includes the following steps:

[0084]On the high speed operation instruction without cooling fan, the auxiliary power supply system allows the cooling fan to start, the cooling fan is low-speed windless, there is a cooling fan at low speed operation request or no low speed operation request and the cooling fan is high-speed air cooling. Fan low speed running instruction.

[0085]Other situations, the cooling fan is not transmitted; if there is a cooling fan high-speed operation instruction, the auxiliary power supply system does not allow the cooling fan to start, there is no low-speed running request and the cooling fan is high-speed air-cooled, any condition satisfied Do not send a cooling fan at low speed operation instructions.

[0086]Determine a specific implementation process of the step of the cooling fan low-speed operation instruction, such asFigure 4 As shown, including:

[0087]Step S421: Determine whether there is a cooling fan high-speed operation instruction: there is a cooling fan high-speed operation command, then perform step S427; no cooling fan high speed operation command, step S422 is executed;

[0088]Step S422: The auxiliary power supply system allows the cooling fan to start: The cooling fan is not allowed to start, then step S427 is performed; allowing the cooling fan to start, step S423 is performed;

[0089]Step S423: Determine whether there is a cooling fan low-speed run request: no cooling fan low speed run request, then step S426 is executed; the cooling fan is low-speed running request, then step S424 is executed;

[0090]Step S424: Whether there is a low-speed air open fault or a low speed start fault: there is a low-speed air-opening fault or a low speed start fault, then step S427 is executed; there is no low-speed air-opening fault or a low speed start fault, then step S425; low speed air failure or Low speed start fault, that is, the cooling fan is low-speed and cold, and low-speed wind cool is unable to carry out the state of the cooling fan. The cooling fan is low-speed wind and cold. It is a failure of low-speed air failures and / or low speed startup failures.

[0091]Step S425: Send a cooling fan low speed operation command;

[0092]Step S426: Whether there is a high-speed air-opening fault or high speed start fault: there is no high-speed air open fault or high speed start fault, then step S427 is executed; there is a high-speed air-opening fault or high speed start fault, then perform step S424;

[0093]Step S427: Do not issue a cooling fan at low speed operation instructions.

[0094]Example 2

[0095]The cooling fan control method of the rail train traction motor of the present application embodiment has the following characteristics on the basis of the first example.

[0096]In the implementation, in the operating control of high-speed air-cooled, it is determined whether or not the high-speed running request of the cooling fan is specifically included in the following steps:

[0097]A plurality of sub-steps that judge whether or not the cooling fan is high-speed operation;

[0098]In any sub-step of determining whether or not the cooling fan is running high-speed operation request, the result is a cooling fan high-speed operation request when the cooling fan is running at a high speed running request.

[0099]Specifically, a plurality of steps that determine whether or not the sub-step of the cooling fan is running high speed, including:

[0100]In the case where the traction inverter is operated, and the cooling fan is very air cooled without failure;

[0101]When the current speed of the train is greater than or equal to the second preset high speed, a cooling fan high-speed operation request is issued;

[0102]When the current speed of the train is greater than or equal to the second preset high speed, it continues to remain in a cooling fan high-speed operation request when it is less than the second preset high speed, and is greater than or equal to the first preset high speed.

[0103]When the current speed of the train drops to less than the first preset high speed, the cooling fan high speed operation request is issued;

[0104]The cooling indicator information includes the current speed of the train; specifically, the first preset high speed is 55 kilometers per hour, and the second preset high speed is 60 kilometers per hour.

[0105]In this way, when the current speed of the train is greater than or equal to the second preset high speed, a cooling fan high-speed operation request is issued; the speed is smaller than the second preset high speed, and is greater than or equal to the first preset high speed, continue to operate the cooling fan high speed operation. request. During the train from the high speed, the traction motor needs to be continuously cooled to reduce the temperature of the traction motor.

[0106]Specifically, the current speed of the train is collected by the speed sensor of the brake control system, and is fed back to the central control unit by the communication bus such as the MVB bus.

[0107]Determine whether or not a sub-step step of the cooling fan is a specific implementation process, such asFigure 5 As shown, including:

[0108]Step S211: The TCU rectifier and the inverter pulse are activated, then step S212; the TCU rectifier and the inverter pulse activation, that is, the traction control unit outputs the rectifier and the inverter pulse activation, indicating that the traction inverter is in operation, The state of the traction inverter.

[0109]Step S212: Whether there is a cooling fan high-speed air-cooled fault: The high speed of the cooling fan is faulty, then step S216 is executed; the cooling fan is high-speed air cooling, then step S213;

[0110]Step S213: Determines if the current speed of the train is greater than or equal to the second preset high speed: the current speed of the train is greater than or equal to the second preset high speed, then perform step S214; the current speed of the train is less than the second preset high speed, then perform step S215;

[0111]Step S214: Send a cooling fan high-speed run request;

[0112]Step S215: Determines if the current speed of the train is less than the first high speed: the current speed of the train is smaller than the first high speed, perform step S216;

[0113]Step S216: Do not issue a cooling fan high-speed run request.

[0114]In the implementation, the steps of determining whether or not the sub-step of the cooling fan is running high speed, including:

[0115]In the case of the working state of the traction inverter, and the cooling fan is very air-cooled, there is no fault,

[0116]Take the larger value in both the stator temperature of the first traction motor of the same steering frame and the stator temperature of the second traction motor, as the stator temperature of the traction motor;

[0117]When the stator temperature of the traction motor is greater than or equal to the second preset high temperature of the stator, the cooling fan high speed operation request is issued;

[0118]The stator temperature of the traction motor is lowered from the stator second preset high temperature to less than the second preset high temperature of the stator, and is greater than or equal to the first preset high temperature of the stator, continue to remain in the cooling fan high speed operation;

[0119]When the stator temperature of the traction motor is lowered to less than the first preset high temperature of the stator, the cooling fan is not issued;

[0120]The cooling indicator information further includes a stator temperature of the first traction motor of the same steering frame and a stator temperature of the second traction motor. Specifically, the first preset of the stator is 179 degrees Celsius, and the stator second preset is 189 degrees Celsius.

[0121]Thus, when the stator temperature of the traction motor is greater than or equal to the second preset high temperature of the stator; the cooling fan is high-speed operation request; cooling to less than the second preset high temperature of the stator, and is greater than or equal to the first preset high temperature, continue to remain cooling Fan high speed running request. During the stator temperature of the traction motor, the traction motor is continuously cooled during the high temperature cooling process to reduce the stator temperature of the traction motor.

[0122]Specifically, the stator temperature and the stator temperature of the first traction motor of the same steering frame are collected by the axial temperature monitoring system, and the communication bus is fed back to the central control unit by the communication bus, such as the MVB bus. When the axial temperature monitoring system collects the axial temperature data, the temperature of the stator temperature and the drive end of the traction motor driven the bearing and the non-driving end are also acquired. And the axial temperature monitoring system is originally communicated with the central processing unit CCU. Therefore, the central processing unit CCU is used alone, and the partial data communication between the traction control unit TCU and the central control unit CCU is reduced while the traction control unit TCU is not rely on communication data, control accuracy. High, the control is executed fast.

[0123]Judging whether there is another process for the sub-step of the cooling fan high-speed running request, such asFigure 6 As shown, including:

[0124]Step S221: The TCU rectifier and the inverter pulse are activated, then step S222 is performed;

[0125]Step S222: Whether there is a cooling fan high-speed air-cooled failure: the high speed of the cooling fan is faulty, then step S223 is performed; the cooling fan is very air cooled, then step S224 is performed;

[0126]Step S223: Do not issue a cooling fan high-speed operation request;

[0127]Step S224: Determine the stator temperature of the traction motor;

[0128]Step S225: Determine whether the stator temperature of the traction motor is greater than or equal to the second preset high temperature of the stator: The stator temperature of the traction motor is greater than or equal to the second preset high temperature of the stator, and performs step S226: The stator temperature of the traction motor is less than the second preset high temperature of the stator. , Perform step S227;

[0129]Step S226: Send a cooling fan high-speed run request.

[0130]Step S227: Judging whether the stator temperature of the traction motor is less than the stator first preset high temperature: the stator temperature of the traction motor is smaller than the stator first preset high temperature, and step S223 is performed.

[0131]In the implementation, the steps of determining whether or not the sub-step of the cooling fan is running high speed, including:

[0132]In the case of the working state of the traction inverter, and the cooling fan is very air-cooled, there is no fault,

[0133]The driving end temperature and the non-drive end temperature of the same bracket drive the bearing and the driving end temperature of the second traction motor drive the bearing and the non-driving end temperature takes a large value in four, as a traction motor drive bearing temperature;

[0134]When the temperature of the drive bearing of the traction motor is greater than or equal to the second preset high temperature of the drive bearing, the cooling fan high speed operation request is issued;

[0135]The temperature of the traction motor drive bearing is higher than or equal to the second preset high temperature of the drive bearing to less than the driving bearing second preset high temperature, and is greater than or equal to the first preset high temperature of the drive bearing, continue to remain emit a cooling fan high-speed operation request;

[0136]When the temperature of the traction motor driven bearing is lowered to less than the driving bearing first preset high temperature, the transmission of the cooling fan high speed operation request is stopped;

[0137]Wherein the cooling index information further includes a driving end temperature of the first traction motor of the same steering frame and a non-driving end temperature and the driving end temperature of the second traction motor and the non-driving end temperature. Specifically, the first preset high temperature of the drive bearing is 85 degrees Celsius, and the drive bearing second preset is 95 degrees Celsius.

[0138]In this way, when the temperature of the traction motor drive bearing is greater than or equal to the second preset high temperature of the drive bearing; the cooling fan is high-speed operation request; cooling to less than the driving bearing second preset high temperature, and is greater than or equal to the driving bearing first preset high temperature, Continue to maintain a high-speed run request for a cooling fan. During the drive bearing temperature of the traction motor, the traction motor is continuously cooled from the high temperature cooling process to reduce the stator temperature of the traction motor.

[0139]Judging whether the sub-step of the cooling fan high-speed running request is once again a specific implementation, such asFigure 7 As shown, including:

[0140]Step S231: The TCU rectifier and the inverter pulse are activated, then step S232 is performed;

[0141]Step S232: Whether there is a cooling fan high speed air cooling failure: The cooling fan is faulty, then performs step S233; the cooling fan is high-speed air-cooled, then the step S234 is executed;

[0142]Step S233: Do not issue a cooling fan high-speed run request;

[0143]Step S234: Determine the stator temperature of the traction motor;

[0144]Step S235: Determine whether the stator temperature of the traction motor is greater than or equal to the second preset high temperature of the stator: The stator temperature of the traction motor is greater than or equal to the second preset high temperature of the stator, and performs step S236: The stator temperature of the traction motor is less than the second preset high temperature of the stator. , Perform step S237;

[0145]Step S236: Send a cooling fan high-speed run request.

[0146]Step S237: Determine if the stator temperature of the traction motor is smaller than the stator first preset high temperature: the stator temperature of the traction motor is smaller than the stator first preset high temperature, and step S233 is performed.

[0147]Specifically, the driving end temperature of the first traction motor drives the bearing and the driving end temperature and the non-driving end temperature of the second traction motor drive bearing are collected by the axial temperature monitoring system, and the communication bus, such as the MVB bus feedback Central control unit.

[0148]In the implementation, when there is a cooling fan low-speed operation request, the cooling fan is low-speed, and the cooling fan cannot enter the low speed operation, and the cooling fan high-speed operation request will be issued. Specifically, in the case where the traction inverter is operated, and the cooling fan is very air cooled, there is no failure.

[0149]When the current speed of the train is greater than or equal to the second preset low speed, the cooling fan high speed operation request is issued when the cooling fan is low-speed.

[0150]Thus, when there is a cooling fan low-speed operation request, the cooling fan is unable to issue a cooling fan at low speed operation instructions, and the cooling fan is unable to issue a cooling fan. Further, according to the step of the control method, the auxiliary power supply system allows the cooling fan to activate, with a cooling fan high-speed operation request, the cooling fan is high-speed air cooled, and the various conditions are satisfied, and the cooling fan is issued. High-speed running instructions. The cooling fan cools the traction motor in accordance with the high-speed air-cooled cooling. In this way, the degree of cooling is high, and the traction motor does not cause damage, and the traction motor is protected.

[0151]Determine whether or not a sub-step step of the cooling fan is a specific implementation process, such asFigure 8 As shown, including:

[0152]Step S241: The TCU rectifier and the inverter pulse are activated, then step S242 is performed;

[0153]Step S242: Whether there is a cooling fan high-speed air-cooled fault: The high speed of the cooling fan is faulty, then step S243 is performed; the cooling fan is high-speed air cooling, then the step S246 is performed;

[0154]Step S243: Determine whether the current speed of the train is greater than or equal to the second preset low speed: the current speed of the train is greater than or equal to the second preset low speed, perform step S244; the current speed of the train is less than the second preset low speed, return to perform step S243;

[0155]Step S244: Whether the cooling fan low-speed wind is faulty: When the cooling fan is low-speed, step S245 is performed.

[0156]Step S245: Send a cooling fan high-speed operation request;

[0157]Step S246: Do not issue a cooling fan high-speed run request.

[0158]The cooling fan control method of the rail train traction motor of the present application, through the current speed of the train, the stator temperature of the traction motor, the driving end temperature of the traction motor drives the bearing, the monitoring of the non-driving end temperature, comprehensive consideration of the auxiliary power supply system The pressure load starts the control timing, and the state of the cooling fan, realizes the automatic start-stop control of the high-speed air-cooled cooling fan, and can heat the traction motor to protect the traction motor.

[0159]Example three

[0160]The cooling fan control method of the rail train traction motor of the present application embodiment has the following characteristics based on the second embodiment.

[0161]In the implementation, in the operating control of low-speed air-cooled, it is determined whether or not the cooling fan is low-speed running request, which includes the following steps:

[0162]A plurality of sub-steps that determine whether or not to make a cooling fan at low speed operation requests;

[0163]In any sub-step that determines whether or not the cooling fan is low-speed running request, the result is a low speed request for a cooling fan when a cooling fan is issued.

[0164]Specifically, a plurality of steps that determine whether or not a sub-step of a cooling fan is low-speed operation request, including:

[0165]In the case where the state of the traction inverter is a working state, and the cooling fan is low-speed air and cold;

[0166]When the current speed of the train is greater than or equal to the second preset low speed, a cooling fan is issued at a low speed operation request;

[0167]When the current speed of the train is greater than or equal to the second preset low speed, the cooling fan is continuously operated by the second preset low speed, and is greater than or equal to the first preset low speed.

[0168]When the current speed of the train drops to less than the first preset low speed, the cooling fan is not issued low-speed operation request.

[0169]Specifically, the first preset low speed is 7 kilometers per hour, and the second preset low speed is 10 kilometers per hour. The faster the current speed of the train, the higher the power of the traction motor. Depending on the current speed of the train, the cooling fan is issued high-speed operation request, and the cooling fan is low-speed running request, which can save energy.

[0170]In the implementation, the steps of determining whether or not the sub-step of the cooling fan is low-speed operation request, including:

[0171]In the case where the traction inverter is working, and the cooling fan is low-speed and cold without failure.

[0172]Take the larger value in both the stator temperature of the first traction motor of the same steering frame and the stator temperature of the second traction motor, as the stator temperature of the traction motor;

[0173]When the stator temperature of the traction motor is greater than or equal to the second preset low temperature of the stator, a cooling fan is issued at a low speed operation request;

[0174]The stator temperature of the traction motor is less than or equal to the second preset low temperature of the stator to less than the stator second preset low temperature, and is greater than or equal to the first preset low temperature of the stator, continue to operate the cooling fan low speed operation request;

[0175]When the stator temperature of the traction motor is low-temperature cooling to less than the stator first preset low temperature, the cooling fan is not issued low-speed operation request.

[0176]Specifically, the first preset low temperature is 52 degrees Celsius, and the second preset low temperature of the stator is 60 degrees Celsius.

[0177]In the implementation, multiple steps of judging whether or not the sub-step of the cooling fan is low-speed, the specifically includes:

[0178]In the case where the traction inverter is working, and the cooling fan is low-speed and cold without failure.

[0179]The driving end temperature and the non-driving end temperature of the first traction motor driven by the same steering frame and the driving end temperature of the second traction motor drive the bearing, any temperature is greater than or equal to the driving bearing second preset low temperature When you send a cooling fan at low speed operation request;

[0180]The driving end temperature and the non-driving end temperature of the first traction motor and the non-driving end temperature and the driving end temperature of the second traction motor drive the bearing, the temperature is the highest temperature to the second preset cryogenic cooling to the drive bearing second preset low temperature. Small less than the second preset low temperature of the drive bearing, and is greater than the driving bearing first preset low temperature, continue to maintain a low speed operation request of the cooling fan;

[0181]The driving end temperature and the non-driving end temperature of the first traction motor and the non-driving end temperature and the driving end temperature of the second traction motor drive the bearing are smaller than the driving bearing first preset low temperature, no cooling fan Low speed running request.

[0182]Specifically, the drive bearing first preset low temperature is 50 degrees Celsius, and the drive bearing second preset low temperature is 60 degrees Celsius.

[0183]In the implementation, multiple steps of judging whether or not the sub-step of the cooling fan is low-speed, the specifically includes:

[0184]When the train is stationary, the stator temperature of the first traction motor and the stator temperature of the second traction motor are greater than the driving end temperature and the non-driving end temperature of the first traction motor drive bearing, or the first traction motor drive bearing. The driving end temperature of the two-traction motor drive bearing and the non-driving end temperature are greater than or equal to the first preset low temperature of the drive bearing, and the preset time long cooling fan is low-speed startup request.

[0185]Specifically, the preset time is 3 minutes, which can be adjusted according to energy saving or other circumstances.

[0186]The cooling fan control method of the rail train traction motor of the present application, through the current speed of the train, the stator temperature of the traction motor, the driving end temperature of the traction motor drives the bearing, the monitoring of the non-driving end temperature, comprehensive consideration of the auxiliary power supply system The pressure load starts the control timing, and the state of the cooling fan, realizes the automatic start-up control of the cooling fan low-speed wind cooling and stop operation, and can heat the traction motor to protect the traction motor.