An intelligent variable frequency fan cooling system for a motor

Abstract

The present invention discloses an intelligent variable frequency fan cooling system for a motor, relates to the field of electric power, and solves the problem of poor cooling effect of existing variable frequency fan cooling systems. The system comprises a temperature data module: used for obtaining a temperature monitoring cycle, obtaining a first fan operating coefficient by monitoring the ambient temperature of the working environment of the motor, and obtaining a second fan operating coefficient by monitoring the working temperature of the motor body, thereby obtaining motor temperature monitoring data; a current data module: used for obtaining a circuit cycle monitoring coefficient of each current sensor within the current monitoring cycle, averaging the obtained multiple circuit cycle monitoring coefficients to obtain a third fan operating coefficient; and a fan control module: used for controlling the cooling of the variable frequency fan by analyzing the first fan operating coefficient, the second fan operating coefficient, and the third fan operating coefficient. The present invention can improve the control efficiency of the variable frequency fan and save power resources.

Description

Technical Field

[0001] The present invention belongs to the field of electric power and relates to electric power control technology, in particular to an intelligent variable frequency fan cooling system for a motor. Background Art

[0002] The existing intelligent variable frequency fan cooling system has the following specific defects when cooling the motor:

[0003] 1. The existing motor cooling system cannot automatically adjust the working power of the cooling fan according to the ambient temperature and operating temperature of the motor, which easily causes the motor temperature to be too high, thereby damaging the insulation material;

[0004] 2. Existing motor cooling systems are unable to automatically adjust the cooling fan's operating power based on the motor's cycle current value and current change rate. As a result, the fan cannot promptly increase its cooling capacity when the current load increases, shortening the motor's lifespan.

[0005] To this end, we propose an intelligent variable frequency fan cooling system for motors. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the present invention aims to provide an intelligent variable frequency fan cooling system for a motor. The present invention is based on obtaining a temperature monitoring cycle, and obtains a first fan operating coefficient by monitoring the ambient temperature of the working environment of the motor. The second fan operating coefficient is obtained by monitoring the working temperature of the motor body. The first fan operating coefficient and the second fan operating coefficient are defined as motor temperature monitoring data. Several current sensors are installed in the motor, and the periodic monitoring current value and the periodic current change rate of each current sensor within the current monitoring cycle are obtained respectively, and the circuit periodic monitoring coefficient is obtained by analysis. The average of the multiple circuit periodic monitoring coefficients obtained is calculated to obtain a third fan operating coefficient. The fan judgment control coefficient is obtained by analyzing the first fan operating coefficient, the second fan operating coefficient and the third fan operating coefficient. The fan judgment control coefficient threshold is obtained and compared with the fan judgment control coefficient for numerical comparison, and the variable frequency fan is cooled and controlled according to the numerical comparison result.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an intelligent variable frequency fan cooling system for a motor, wherein the specific working process of each module is as follows:

[0008] Temperature data module: used to obtain the temperature monitoring cycle, obtain the first fan operating coefficient by monitoring the ambient temperature of the working environment of the motor, and obtain the second fan operating coefficient by monitoring the working temperature of the motor body. The first fan operating coefficient and the second fan operating coefficient are defined as motor temperature monitoring data;

[0009] Current data module: used to install several current sensors in the motor, respectively obtain the periodic monitoring current value and periodic current change rate of each current sensor within the current monitoring period, analyze and obtain the circuit periodic monitoring coefficient, and average the obtained multiple circuit periodic monitoring coefficients to obtain the third fan working coefficient;

[0010] Fan control module: used to obtain the fan judgment and control coefficient by analyzing the first fan working coefficient, the second fan working coefficient and the third fan working coefficient, obtain the fan judgment and control coefficient threshold and perform numerical comparison with the fan judgment and control coefficient, and perform cooling control on the variable frequency fan according to the numerical comparison result.

[0011] Furthermore, the temperature data module includes a motor temperature unit and an ambient temperature unit;

[0012] In the process of temperature monitoring of the motor, the time value corresponding to the current moment is marked as the first cycle characteristic time point, a second cycle characteristic time point is marked in the period before the first cycle characteristic time point, and the period between the first cycle characteristic time point and the second cycle characteristic time point is marked as the temperature monitoring period;

[0013] In the temperature monitoring period, a plurality of temperature monitoring time points with the same time interval are marked, and the marked temperature monitoring time points are named as the first temperature monitoring time point to the wth temperature monitoring time point respectively;

[0014] The ambient temperature unit monitors the temperature of the motor working environment during the temperature monitoring period to obtain a first fan working coefficient;

[0015] The motor temperature unit monitors the temperature of the motor in the temperature monitoring period to obtain a second fan operating coefficient;

[0016] The first fan operating coefficient and the second fan operating coefficient are defined as motor temperature monitoring data.

[0017] Furthermore, the ambient temperature unit obtains the first fan operating coefficient as follows:

[0018] In the working environment of the motor, a number of ambient temperature monitoring points are randomly selected, and a sample ambient temperature monitoring point is marked at the selected number of ambient temperature monitoring points;

[0019] Perform temperature monitoring on the sample environment monitoring point to obtain the ambient temperature monitoring coefficient corresponding to the sample environment monitoring point;

[0020] Repeat the process of obtaining the ambient temperature monitoring coefficient corresponding to the sample environmental monitoring point, obtain the ambient temperature monitoring coefficient corresponding to each ambient temperature monitoring point respectively, obtain multiple ambient temperature monitoring coefficients, and calculate the average of the multiple ambient temperature monitoring coefficients obtained to obtain the first fan working coefficient.

[0021] Furthermore, the ambient temperature unit obtains the ambient temperature monitoring coefficient corresponding to the sample environmental monitoring point, as follows:

[0022] Obtain the monitoring temperature values ​​corresponding to the first temperature monitoring time point to the wth temperature monitoring time point of the sample environment monitoring point, and obtain the first ambient temperature value to the wth ambient temperature value;

[0023] Calculate the average of the first to wth ambient temperature values ​​to obtain an average ambient temperature value;

[0024] Compare the values ​​of the first to the wth ambient temperature values, and mark the ambient temperature value with the largest value as the peak ambient temperature value;

[0025] Calculate the variance of the first ambient temperature value to the wth ambient temperature value to obtain the ambient temperature variance;

[0026] The ambient temperature monitoring coefficient corresponding to the sample environmental monitoring point is obtained by calculating the average ambient temperature value, the peak ambient temperature value and the ambient temperature variance;

[0027] Calculate the ambient temperature monitoring coefficient corresponding to the sample environmental monitoring point. The specific formula is as follows:

[0028] ;

[0029] Among them, Hwy is the ambient temperature monitoring coefficient corresponding to the sample environmental monitoring point, Hwp is the average value of the ambient temperature, Hwf is the peak ambient temperature value, and Hfc is the ambient temperature variance.

[0030] Furthermore, the motor temperature unit obtains the second fan operating coefficient as follows:

[0031] In the motor body area, a number of motor temperature monitoring points are randomly selected, and a sample motor monitoring point is marked at the selected number of motor temperature monitoring points;

[0032] Perform temperature monitoring on the sample motor monitoring points to obtain the motor temperature monitoring coefficient corresponding to the sample motor monitoring points;

[0033] Repeat the process of obtaining the motor temperature monitoring coefficient corresponding to the sample motor monitoring point, obtain the motor temperature monitoring coefficient corresponding to each motor temperature monitoring point respectively, obtain multiple motor temperature monitoring coefficients, and calculate the average of the multiple motor temperature monitoring coefficients obtained to obtain the second fan working coefficient.

[0034] Furthermore, the motor temperature unit obtains the motor temperature monitoring coefficient corresponding to the sample motor monitoring point, as follows:

[0035] Obtain the monitoring temperature values ​​corresponding to the first temperature monitoring time point to the wth temperature monitoring time point of the sample motor monitoring point, and obtain the first motor temperature value to the wth motor temperature value;

[0036] Calculate the average of the first motor temperature value to the wth motor temperature value to obtain the average motor temperature value;

[0037] Compare the values ​​of the first motor temperature value to the wth motor temperature value, and mark the motor temperature value with the largest value as the peak motor temperature value;

[0038] Calculate the variance of the first motor temperature value to the wth motor temperature value to obtain the motor temperature variance;

[0039] The motor temperature monitoring coefficient corresponding to the sample motor monitoring point is obtained by calculating the average motor temperature value, the peak motor temperature value and the motor temperature variance;

[0040] Calculate the motor temperature monitoring coefficient corresponding to the sample motor monitoring point. The specific formula is as follows:

[0041] ;

[0042] Where Dwy is the motor temperature monitoring coefficient corresponding to the sample motor monitoring point, Dwp is the average motor temperature value, Dwf is the peak motor temperature value, and Dfc is the motor temperature variance.

[0043] Furthermore, the current data module obtains the third fan operating coefficient as follows:

[0044] During the process of monitoring the current of the motor, the time value corresponding to the current moment is marked as a first current cycle time point, a second current cycle time point is selected in the period before the first current cycle time point, and the period between the first current cycle time point and the second current cycle time point is marked as a current monitoring period;

[0045] In the current monitoring period, a number of current monitoring time points are marked respectively, and the interval between each two consecutive current monitoring time points is equal, and the marked current monitoring time points are named as the first current monitoring time point to the dth current monitoring time point respectively;

[0046] In the motor body, several different power positions are selected, a current sensor is installed at each power position to obtain multiple current sensors, and a sample current sensor is selected from the multiple installed current sensors;

[0047] Analyzing the current data of the sample current sensor in the current monitoring cycle to obtain the circuit cycle monitoring coefficient;

[0048] Repeat the circuit cycle monitoring coefficient corresponding to the sample current sensor, obtain the circuit cycle monitoring coefficient corresponding to each current sensor respectively, obtain multiple circuit cycle monitoring coefficients, and calculate the average of the obtained multiple circuit cycle monitoring coefficients to obtain the third fan working coefficient.

[0049] Furthermore, the current data module obtains the circuit cycle monitoring coefficient as follows:

[0050] Acquire monitoring current values ​​corresponding to the first current monitoring time point to the dth current monitoring time point of the sample current sensor to obtain the first monitoring current value to the dth monitoring current value;

[0051] Calculate the average of the first monitoring current value to the dth monitoring current value to obtain a periodic monitoring current value;

[0052] Get the periodic current change rate;

[0053] The cycle monitoring current value and the cycle current change rate are calculated to obtain the circuit cycle monitoring coefficient corresponding to the sample current sensor;

[0054] Calculate the circuit cycle monitoring coefficient corresponding to the sample current sensor. The specific formula is as follows:

[0055] ;

[0056] Wherein, Ijx is the circuit cycle monitoring coefficient corresponding to the sample current sensor, Dlp is the cycle monitoring current value, and Bhl is the cycle current change rate.

[0057] Furthermore, the current data module acquires the periodic current change rate as follows:

[0058] In the existing broken line statistical graph template, the first current monitoring time point to the dth current monitoring time point are used as the horizontal axis, and the first monitoring current value to the dth monitoring current value are used as the vertical axis to establish a current change broken line graph;

[0059] In the current change line graph, the coordinate points corresponding to the first current monitoring time point to the dth current monitoring time point are named as the first current coordinate point to the dth current coordinate point respectively;

[0060] Connect the first current coordinate point and the second current coordinate point with a straight line to obtain a first current line segment, connect the second current coordinate point and the third current coordinate point with a straight line to obtain a second current line segment, and so on, connect the d-1th current coordinate point and the dth current coordinate point with a straight line to obtain a d-1th current line segment;

[0061] In the rectangular coordinate system of the current change plane, the first current coordinate point and the second current coordinate point are calculated to obtain the slope of the first current line segment;

[0062] The slope of the first current segment is calculated using the following formula:

[0063] ;

[0064] Wherein, Xl1 is the slope of the first current line segment, (x1, y1) is the plane rectangular coordinate corresponding to the first current coordinate point, and (x2, y2) is the plane rectangular coordinate corresponding to the first current coordinate point;

[0065] The line segment slopes corresponding to the second current line segment to the d-1th current line segment are respectively obtained to obtain the slope of the second current line segment to the d-1th current line segment, and the slope of the first current line segment to the d-1th current line segment are averaged to obtain the periodic current change rate.

[0066] Furthermore, the fan control module performs cooling control on the variable frequency fan as follows:

[0067] Acquire motor temperature monitoring data, and acquire a first fan operating coefficient and a second fan operating coefficient respectively according to the motor temperature monitoring data;

[0068] Get the working coefficient of the third fan;

[0069] The fan judgment control coefficient is obtained by calculating the first fan working coefficient, the second fan working coefficient and the third fan working coefficient;

[0070] Calculate the fan control coefficient. The specific formula is as follows:

[0071] ;

[0072] Among them, Fsk is the fan judgment control coefficient, Fgx1 is the first fan working coefficient, Fgx2 is the second fan working coefficient, and Fgx3 is the third fan working coefficient;

[0073] Obtain a fan judgment and control coefficient threshold, compare the fan judgment and control coefficient threshold with the fan judgment and control coefficient, and perform cooling control on the variable frequency fan based on the comparison result.

[0074] The details are as follows:

[0075] Obtaining a first fan operating coefficient threshold, a second fan operating coefficient threshold, and a third fan operating coefficient threshold respectively;

[0076] The first fan operating coefficient threshold, the second fan operating coefficient threshold and the third fan operating coefficient threshold are calculated to obtain a fan judgment control coefficient threshold;

[0077] When the fan judgment control coefficient is greater than the fan judgment control coefficient threshold, the operating power of the variable frequency fan is increased until the fan judgment control coefficient is equal to the fan judgment control coefficient threshold;

[0078] When the fan judgment control coefficient is less than the fan judgment control coefficient threshold, the operating power of the variable frequency fan is reduced until the fan judgment control coefficient is equal to the fan judgment control coefficient threshold;

[0079] When the fan judgment control coefficient is equal to the fan judgment control coefficient threshold, there is no need to adjust the operating power of the variable frequency fan.

[0080] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0081] 1. The present invention obtains a first fan operating coefficient by monitoring the ambient temperature of the working environment of the motor, and obtains a second fan operating coefficient by monitoring the working temperature of the motor body, thereby improving the comprehensiveness of the monitoring of the motor temperature data;

[0082] 2. The present invention obtains the fan judgment and control coefficient by analyzing the first fan working coefficient, the second fan working coefficient and the third fan working coefficient, obtains the fan judgment and control coefficient threshold and performs numerical comparison with the fan judgment and control coefficient, and controls the cooling of the variable frequency fan according to the numerical comparison result, thereby realizing automatic control of the motor cooling system, improving the utilization efficiency of power resources, and increasing the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0084] Figure 1 is a block diagram of the overall system of the present invention;

[0085] Figure 2 It is a line graph of current change of the present invention;

[0086] Figure 3 It is a schematic diagram of a local area of ​​the present invention. DETAILED DESCRIPTION

[0087] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0088] Example 1

[0089] See also Figure 1 The present invention provides a technical solution: an intelligent variable frequency fan cooling system for a motor, comprising a temperature data module, a current data module, a fan control module and a server, wherein the temperature data module, the current data module and the fan control module are respectively connected to the server, and the server controls the temperature data module, the current data module and the fan control module respectively;

[0090] The temperature data module obtains the first fan working coefficient and the second fan working coefficient respectively to obtain the motor temperature monitoring coefficient;

[0091] The temperature data module includes a motor temperature unit and an ambient temperature unit;

[0092] In the process of temperature monitoring of the motor, the time value corresponding to the current moment is marked as the first cycle characteristic time point, a second cycle characteristic time point is marked in the period before the first cycle characteristic time point, and the period between the first cycle characteristic time point and the second cycle characteristic time point is marked as the temperature monitoring period;

[0093] In the temperature monitoring period, a plurality of temperature monitoring time points with the same time interval are marked, and the marked temperature monitoring time points are named as the first temperature monitoring time point to the wth temperature monitoring time point respectively;

[0094] It should be noted here that:

[0095] In this application, as the time value corresponding to the current moment changes, the first cycle characteristic time point and the second cycle characteristic time point also change accordingly, thereby achieving dynamic update of the temperature monitoring cycle;

[0096] The ambient temperature unit monitors the temperature of the motor working environment during the temperature monitoring period to obtain a first fan working coefficient;

[0097] The details are as follows:

[0098] In the working environment of the motor, a number of ambient temperature monitoring points are randomly selected, and a sample ambient temperature monitoring point is marked at the selected number of ambient temperature monitoring points;

[0099] Perform temperature monitoring on the sample environment monitoring point to obtain the ambient temperature monitoring coefficient corresponding to the sample environment monitoring point;

[0100] The details are as follows:

[0101] Obtain the monitoring temperature values ​​corresponding to the first temperature monitoring time point to the wth temperature monitoring time point of the sample environment monitoring point, and obtain the first ambient temperature value to the wth ambient temperature value;

[0102] Calculate the average of the first to wth ambient temperature values ​​to obtain an average ambient temperature value;

[0103] Compare the values ​​of the first to the wth ambient temperature values, and mark the ambient temperature value with the largest value as the peak ambient temperature value;

[0104] Calculate the variance of the first ambient temperature value to the wth ambient temperature value to obtain the ambient temperature variance;

[0105] The ambient temperature monitoring coefficient corresponding to the sample environmental monitoring point is obtained by calculating the average ambient temperature value, the peak ambient temperature value and the ambient temperature variance;

[0106] Calculate the ambient temperature monitoring coefficient corresponding to the sample environmental monitoring point. The specific formula is as follows:

[0107] ;

[0108] Among them, Hwy is the ambient temperature monitoring coefficient corresponding to the sample environmental monitoring point, Hwp is the average value of the ambient temperature, Hwf is the peak ambient temperature value, and Hfc is the ambient temperature variance;

[0109] Repeat the process of obtaining the ambient temperature monitoring coefficient corresponding to the sample environmental monitoring point, obtain the ambient temperature monitoring coefficient corresponding to each ambient temperature monitoring point respectively, obtain multiple ambient temperature monitoring coefficients, and average the obtained multiple ambient temperature monitoring coefficients to obtain the first fan operating coefficient;

[0110] The motor temperature unit monitors the temperature of the motor in the temperature monitoring period to obtain a second fan operating coefficient;

[0111] The details are as follows:

[0112] See also Figure 3, in the working environment where the motor is located, a number of motor temperature monitoring points are randomly selected, and a motor temperature monitoring point is randomly selected from the multiple selected motor temperature monitoring points as a sample motor monitoring point;

[0113] It should be noted here that:

[0114] The multiple motor temperature monitoring points involved here are located in different parts of the motor, and the motor parts involved here include but are not limited to the motor housing, motor circuit and motor inverter;

[0115] It should be noted here that:

[0116] In this application, Figure 3 This is a schematic diagram of a local area of ​​the intelligent variable frequency fan cooling system. In the figure, the location where the temperature sensor is arranged is the motor temperature monitoring point, and the area where the current sensor is arranged is the current monitoring point. The intelligent system can store and transmit the data obtained by the temperature sensor and current sensor in real time. During the cooling process, the motor temperature and ambient temperature are obtained through the temperature sensor, and the current sensor obtains the internal current of the motor. The intelligent control system analyzes the obtained data to determine whether the motor power and current match the fan heat dissipation efficiency, and controls the fan to dissipate heat.

[0117] Perform temperature monitoring on the sample motor monitoring points to obtain the motor temperature monitoring coefficient corresponding to the sample motor monitoring points;

[0118] The details are as follows:

[0119] Obtain the monitoring temperature values ​​corresponding to the first temperature monitoring time point to the wth temperature monitoring time point of the sample motor monitoring point, and obtain the first motor temperature value to the wth motor temperature value;

[0120] Calculate the average of the first motor temperature value to the wth motor temperature value to obtain the average motor temperature value;

[0121] Compare the values ​​of the first motor temperature value to the wth motor temperature value, and mark the motor temperature value with the largest value as the peak motor temperature value;

[0122] Calculate the variance of the first motor temperature value to the wth motor temperature value to obtain the motor temperature variance;

[0123] The motor temperature monitoring coefficient corresponding to the sample motor monitoring point is obtained by calculating the average motor temperature value, the peak motor temperature value and the motor temperature variance;

[0124] Calculate the motor temperature monitoring coefficient corresponding to the sample motor monitoring point. The specific formula is as follows:

[0125] ;

[0126] Where Dwy is the motor temperature monitoring coefficient corresponding to the sample motor monitoring point, Dwp is the average motor temperature value, Dwf is the peak motor temperature value, and Dfc is the motor temperature variance;

[0127] Repeat the process of obtaining the motor temperature monitoring coefficient corresponding to the sample motor monitoring point, obtain the motor temperature monitoring coefficient corresponding to each motor temperature monitoring point respectively, obtain multiple motor temperature monitoring coefficients, and average the obtained multiple motor temperature monitoring coefficients to obtain the second fan operating coefficient;

[0128] The first fan operating coefficient and the second fan operating coefficient are defined as motor temperature monitoring data;

[0129] The temperature data module acquires the motor temperature monitoring data and transmits it to the fan control module;

[0130] The current data module installs several current sensors in the motor, obtains the periodic monitoring current value and periodic current change rate of each current sensor within the current monitoring period, analyzes and obtains the circuit periodic monitoring coefficient, and averages the obtained multiple circuit periodic monitoring coefficients to obtain the third fan working coefficient;

[0131] The details are as follows:

[0132] During the process of monitoring the current of the motor, the time value corresponding to the current moment is marked as a first current cycle time point, a second current cycle time point is selected in the period before the first current cycle time point, and the period between the first current cycle time point and the second current cycle time point is marked as a current monitoring period;

[0133] It should be noted here that:

[0134] In this application, the current monitoring period and the temperature monitoring period involved here correspond to the same time range;

[0135] In the present application, as the time value corresponding to the current moment changes, the first current cycle time point and the second current cycle time point also change accordingly, thereby achieving dynamic update of the current monitoring cycle;

[0136] In the current monitoring period, a number of current monitoring time points are marked respectively, and the interval between each two consecutive current monitoring time points is equal, and the marked current monitoring time points are named as the first current monitoring time point to the dth current monitoring time point respectively;

[0137] It should be noted here that:

[0138] In this application, d referred to herein is the quantity value corresponding to the current monitoring time point, and d is an integer greater than 0;

[0139] In the motor body, several different power positions are selected, a current sensor is installed at each power position to obtain multiple current sensors, and a sample current sensor is selected from the multiple installed current sensors;

[0140] Analyzing the current data of the sample current sensor in the current monitoring cycle to obtain the circuit cycle monitoring coefficient;

[0141] The details are as follows:

[0142] Acquire monitoring current values ​​corresponding to the first current monitoring time point to the dth current monitoring time point of the sample current sensor to obtain the first monitoring current value to the dth monitoring current value;

[0143] Calculate the average of the first monitoring current value to the dth monitoring current value to obtain a periodic monitoring current value;

[0144] Get the periodic current change rate;

[0145] The details are as follows:

[0146] See also Figure 2 In the existing broken line statistical graph template, the first current monitoring time point to the dth current monitoring time point is used as the horizontal axis, and the first monitoring current value to the dth monitoring current value is used as the vertical axis to establish a current change broken line graph;

[0147] In the current change line graph, the coordinate points corresponding to the first current monitoring time point to the dth current monitoring time point are named as the first current coordinate point to the dth current coordinate point respectively;

[0148] Connect the first current coordinate point and the second current coordinate point with a straight line to obtain a first current line segment, connect the second current coordinate point and the third current coordinate point with a straight line to obtain a second current line segment, and so on, connect the d-1th current coordinate point and the dth current coordinate point with a straight line to obtain a d-1th current line segment;

[0149] In the rectangular coordinate system of the current change plane, the first current coordinate point and the second current coordinate point are calculated to obtain the slope of the first current line segment;

[0150] The slope of the first current segment is calculated using the following formula:

[0151] ;

[0152] Wherein, Xl1 is the slope of the first current line segment, (x1, y1) is the plane rectangular coordinate corresponding to the first current coordinate point, and (x2, y2) is the plane rectangular coordinate corresponding to the first current coordinate point;

[0153] Obtain the line segment slopes corresponding to the second current line segment to the d-1th current line segment respectively, obtain the slope of the second current line segment to the d-1th current line segment slope, and calculate the average of the slope of the first current line segment to the d-1th current line segment to obtain the periodic current change rate;

[0154] The cycle monitoring current value and the cycle current change rate are calculated to obtain the circuit cycle monitoring coefficient corresponding to the sample current sensor;

[0155] Calculate the circuit cycle monitoring coefficient corresponding to the sample current sensor. The specific formula is as follows:

[0156] ;

[0157] Where Ijx is the circuit cycle monitoring coefficient corresponding to the sample current sensor, Dlp is the cycle monitoring current value, and Bhl is the cycle current change rate;

[0158] Repeating the circuit cycle monitoring coefficient corresponding to the sample current sensor, respectively obtaining the circuit cycle monitoring coefficient corresponding to each current sensor to obtain multiple circuit cycle monitoring coefficients, and averaging the obtained multiple circuit cycle monitoring coefficients to obtain a third fan operating coefficient;

[0159] The current data module obtains the working coefficient of the third fan and transmits it to the fan control module;

[0160] The fan control module obtains a fan judgment control coefficient by analyzing the first fan operating coefficient, the second fan operating coefficient, and the third fan operating coefficient, obtains a fan judgment control coefficient threshold, compares the value with the fan judgment control coefficient, and controls the cooling of the variable frequency fan according to the comparison result.

[0161] The details are as follows:

[0162] Acquire motor temperature monitoring data, and acquire a first fan operating coefficient and a second fan operating coefficient respectively according to the motor temperature monitoring data;

[0163] Get the working coefficient of the third fan;

[0164] The fan judgment control coefficient is obtained by calculating the first fan working coefficient, the second fan working coefficient and the third fan working coefficient;

[0165] Calculate the fan control coefficient. The specific formula is as follows:

[0166] ;

[0167] Among them, Fsk is the fan judgment control coefficient, Fgx1 is the first fan working coefficient, Fgx2 is the second fan working coefficient, and Fgx3 is the third fan working coefficient;

[0168] Obtain a fan judgment and control coefficient threshold, compare the fan judgment and control coefficient threshold with the fan judgment and control coefficient, and perform cooling control on the variable frequency fan based on the comparison result.

[0169] The details are as follows:

[0170] Obtaining a first fan operating coefficient threshold, a second fan operating coefficient threshold, and a third fan operating coefficient threshold respectively;

[0171] The first fan operating coefficient threshold, the second fan operating coefficient threshold and the third fan operating coefficient threshold are calculated to obtain a fan judgment control coefficient threshold;

[0172] It should be noted here that:

[0173] The first fan operating coefficient threshold, the second fan operating coefficient threshold, and the third fan operating coefficient threshold involved herein are respectively the first fan operating coefficient, the second fan operating coefficient, and the third fan operating coefficient when there is no need to adjust the operating power of the variable frequency fan;

[0174] The fan control coefficient threshold is calculated using the following formula:

[0175] ;

[0176] Among them, Fsky is the fan judgment control coefficient threshold, Fgxy1 is the first fan working coefficient threshold, Fgxy2 is the second fan working coefficient threshold, and Fgxy3 is the third fan working coefficient threshold;

[0177] When the fan judgment control coefficient is greater than the fan judgment control coefficient threshold, the operating power of the variable frequency fan is increased until the fan judgment control coefficient is equal to the fan judgment control coefficient threshold;

[0178] When the fan judgment control coefficient is less than the fan judgment control coefficient threshold, the operating power of the variable frequency fan is reduced until the fan judgment control coefficient is equal to the fan judgment control coefficient threshold;

[0179] When the fan judgment control coefficient is equal to the fan judgment control coefficient threshold, there is no need to adjust the operating power of the variable frequency fan;

[0180] In this application, if a corresponding calculation formula appears, the above calculation formula is dimensionless and its numerical calculation is performed. The weight coefficient, proportional coefficient and other coefficients in the formula are set to a result value obtained by quantifying each parameter. Regarding the size of the weight coefficient and the proportional coefficient, as long as it does not affect the proportional relationship between the parameter and the result value, it is acceptable.

[0181] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An intelligent variable frequency fan cooling system for a motor, characterized in that: include: Temperature data module: used to obtain the temperature monitoring cycle, obtain the first fan operating coefficient by monitoring the ambient temperature of the working environment of the motor, and obtain the second fan operating coefficient by monitoring the working temperature of the motor body. The first fan operating coefficient and the second fan operating coefficient are defined as motor temperature monitoring data; Current data module: used to install several current sensors in the motor, respectively obtain the periodic monitoring current value and periodic current change rate of each current sensor within the current monitoring period, analyze and obtain the circuit periodic monitoring coefficient, and average the obtained multiple circuit periodic monitoring coefficients to obtain the third fan working coefficient; Fan control module: used to obtain a fan judgment and control coefficient by analyzing the first fan operating coefficient, the second fan operating coefficient, and the third fan operating coefficient, obtain a fan judgment and control coefficient threshold, compare the value with the fan judgment and control coefficient, and perform cooling control on the variable frequency fan according to the comparison result; The fan control module performs cooling control on the variable frequency fan as follows: Acquire motor temperature monitoring data, and acquire a first fan operating coefficient and a second fan operating coefficient respectively according to the motor temperature monitoring data; Get the working coefficient of the third fan; The fan judgment control coefficient is obtained by calculating the first fan working coefficient, the second fan working coefficient and the third fan working coefficient; Calculate the fan control coefficient. The specific formula is as follows: ； Among them, Fsk is the fan judgment control coefficient, Fgx1 is the first fan working coefficient, Fgx2 is the second fan working coefficient, and Fgx3 is the third fan working coefficient; Obtain a fan judgment and control coefficient threshold, compare the fan judgment and control coefficient threshold with the fan judgment and control coefficient, and perform cooling control on the variable frequency fan based on the comparison result. The details are as follows: Obtaining a first fan operating coefficient threshold, a second fan operating coefficient threshold, and a third fan operating coefficient threshold respectively; The first fan operating coefficient threshold, the second fan operating coefficient threshold and the third fan operating coefficient threshold are calculated to obtain a fan judgment control coefficient threshold; When the fan judgment control coefficient is greater than the fan judgment control coefficient threshold, the operating power of the variable frequency fan is increased until the fan judgment control coefficient is equal to the fan judgment control coefficient threshold; When the fan judgment control coefficient is less than the fan judgment control coefficient threshold, the operating power of the variable frequency fan is reduced until the fan judgment control coefficient is equal to the fan judgment control coefficient threshold; When the fan judgment control coefficient is equal to the fan judgment control coefficient threshold, there is no need to adjust the operating power of the variable frequency fan.

2. The intelligent variable frequency fan cooling system for a motor according to claim 1, characterized in that: The temperature data module includes a motor temperature unit and an ambient temperature unit; In the process of temperature monitoring of the motor, the time value corresponding to the current moment is marked as the first cycle characteristic time point, a second cycle characteristic time point is marked in the period before the first cycle characteristic time point, and the period between the first cycle characteristic time point and the second cycle characteristic time point is marked as the temperature monitoring period; In the temperature monitoring period, a plurality of temperature monitoring time points with the same time interval are marked, and the marked temperature monitoring time points are named as the first temperature monitoring time point to the wth temperature monitoring time point respectively; The ambient temperature unit is used to monitor the temperature of the motor working environment during the temperature monitoring period to obtain a first fan working coefficient; The motor temperature unit is used to monitor the temperature of the motor during a temperature monitoring period to obtain a second fan operating coefficient; The first fan operating coefficient and the second fan operating coefficient are defined as motor temperature monitoring data.

3. The intelligent variable frequency fan cooling system for a motor according to claim 2, characterized in that: The ambient temperature unit obtains the first fan operating coefficient as follows: In the working environment of the motor, a number of ambient temperature monitoring points are randomly selected, and a sample ambient temperature monitoring point is marked at the selected number of ambient temperature monitoring points; Perform temperature monitoring on the sample environment monitoring point to obtain the ambient temperature monitoring coefficient corresponding to the sample environment monitoring point; The ambient temperature monitoring coefficient corresponding to each ambient temperature monitoring point is obtained respectively to obtain a plurality of ambient temperature monitoring coefficients, and the obtained plurality of ambient temperature monitoring coefficients are averaged to obtain a first fan operating coefficient.

4. The intelligent variable frequency fan cooling system for a motor according to claim 3, characterized in that: The ambient temperature unit obtains the ambient temperature monitoring coefficient corresponding to the sample environmental monitoring point, as follows: Obtain the monitoring temperature values ​​corresponding to the first temperature monitoring time point to the wth temperature monitoring time point of the sample environment monitoring point, and obtain the first ambient temperature value to the wth ambient temperature value; Calculate the average of the first to wth ambient temperature values ​​to obtain an average ambient temperature value; Compare the values ​​of the first to the wth ambient temperature values, and mark the ambient temperature value with the largest value as the peak ambient temperature value; Calculate the variance of the first ambient temperature value to the wth ambient temperature value to obtain the ambient temperature variance; The ambient temperature monitoring coefficient corresponding to the sample environmental monitoring point is obtained by calculating the average ambient temperature value, the peak ambient temperature value and the ambient temperature variance; Calculate the ambient temperature monitoring coefficient corresponding to the sample environmental monitoring point. The specific formula is as follows: ； Among them, Hwy is the ambient temperature monitoring coefficient corresponding to the sample environmental monitoring point, Hwp is the average value of the ambient temperature, Hwf is the peak ambient temperature value, and Hfc is the ambient temperature variance.

5. The intelligent variable frequency fan cooling system for a motor according to claim 2, characterized in that: The motor temperature unit obtains the second fan operating coefficient as follows: In the motor body area, a number of motor temperature monitoring points are randomly selected, and a sample motor monitoring point is marked at the selected number of motor temperature monitoring points; Perform temperature monitoring on the sample motor monitoring points to obtain the motor temperature monitoring coefficient corresponding to the sample motor monitoring points; The motor temperature monitoring coefficient corresponding to each motor temperature monitoring point is obtained respectively to obtain a plurality of motor temperature monitoring coefficients, and the average of the obtained plurality of motor temperature monitoring coefficients is calculated to obtain a second fan operating coefficient.

6. The intelligent variable frequency fan cooling system for a motor according to claim 5, characterized in that: The motor temperature unit obtains the motor temperature monitoring coefficient corresponding to the sample motor monitoring point, as follows: Obtain the monitoring temperature values ​​corresponding to the first temperature monitoring time point to the wth temperature monitoring time point of the sample motor monitoring point, and obtain the first motor temperature value to the wth motor temperature value; Calculate the average of the first motor temperature value to the wth motor temperature value to obtain the average motor temperature value; Compare the values ​​of the first motor temperature value to the wth motor temperature value, and mark the motor temperature value with the largest value as the peak motor temperature value; Calculate the variance of the first motor temperature value to the wth motor temperature value to obtain the motor temperature variance; The motor temperature monitoring coefficient corresponding to the sample motor monitoring point is obtained by calculating the average motor temperature value, the peak motor temperature value and the motor temperature variance; Calculate the motor temperature monitoring coefficient corresponding to the sample motor monitoring point. The specific formula is as follows: ； Where Dwy is the motor temperature monitoring coefficient corresponding to the sample motor monitoring point, Dwp is the average motor temperature value, Dwf is the peak motor temperature value, and Dfc is the motor temperature variance.

7. The intelligent variable frequency fan cooling system for a motor according to claim 1, characterized in that: The current data module obtains the third fan operating coefficient as follows: During the process of monitoring the current of the motor, the time value corresponding to the current moment is marked as a first current cycle time point, a second current cycle time point is selected in the period before the first current cycle time point, and the period between the first current cycle time point and the second current cycle time point is marked as a current monitoring period; In the current monitoring period, a number of current monitoring time points are marked respectively, and the interval between each two consecutive current monitoring time points is equal, and the marked current monitoring time points are named as the first current monitoring time point to the dth current monitoring time point respectively; In the motor body, several different power positions are selected, a current sensor is installed at each power position to obtain multiple current sensors, and a sample current sensor is selected from the multiple installed current sensors; Analyzing the current data of the sample current sensor in the current monitoring cycle to obtain the circuit cycle monitoring coefficient; The circuit cycle monitoring coefficient corresponding to each current sensor is acquired respectively to obtain a plurality of circuit cycle monitoring coefficients, and an average of the obtained plurality of circuit cycle monitoring coefficients is calculated to obtain a third fan operating coefficient.

8. The intelligent variable frequency fan cooling system for a motor according to claim 7, characterized in that: The current data module obtains the circuit cycle monitoring coefficient as follows: Acquire monitoring current values ​​corresponding to the first current monitoring time point to the dth current monitoring time point of the sample current sensor to obtain the first monitoring current value to the dth monitoring current value; Calculate the average of the first monitoring current value to the dth monitoring current value to obtain a periodic monitoring current value; Get the periodic current change rate; The cycle monitoring current value and the cycle current change rate are calculated to obtain the circuit cycle monitoring coefficient corresponding to the sample current sensor; Calculate the circuit cycle monitoring coefficient corresponding to the sample current sensor. The specific formula is as follows: ； Wherein, Ijx is the circuit cycle monitoring coefficient corresponding to the sample current sensor, Dlp is the cycle monitoring current value, and Bhl is the cycle current change rate.

9. The intelligent variable frequency fan cooling system for a motor according to claim 8, characterized in that: The current data module acquires the periodic current change rate as follows: In the existing broken line statistical graph template, the first current monitoring time point to the dth current monitoring time point are used as the horizontal axis, and the first monitoring current value to the dth monitoring current value are used as the vertical axis to establish a current change broken line graph; In the current change line graph, the coordinate points corresponding to the first current monitoring time point to the dth current monitoring time point are named as the first current coordinate point to the dth current coordinate point respectively; Connect the first current coordinate point and the second current coordinate point with a straight line to obtain a first current line segment, connect the second current coordinate point and the third current coordinate point with a straight line to obtain a second current line segment, and so on, connect the d-1th current coordinate point and the dth current coordinate point with a straight line to obtain a d-1th current line segment; In the rectangular coordinate system of the current change plane, the first current coordinate point and the second current coordinate point are calculated to obtain the slope of the first current line segment; The slope of the first current segment is calculated using the following formula: ； Wherein, Xl1 is the slope of the first current line segment, (x1, y1) is the plane rectangular coordinate corresponding to the first current coordinate point, and (x2, y2) is the plane rectangular coordinate corresponding to the second current coordinate point; The line segment slopes corresponding to the second current line segment to the d-1th current line segment are respectively obtained to obtain the slope of the second current line segment to the d-1th current line segment, and the slope of the first current line segment to the d-1th current line segment are averaged to obtain the periodic current change rate.

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