DC motor with running monitoring and alarm function

Abstract

The present invention relates to the field of DC motors and is used to solve the problem that the external motor operation monitoring system affects the operation monitoring and alarm function of the DC motor due to insufficient installation coupling. Specifically, it is a DC motor with an operation monitoring and alarm function. In the present invention, through the built-in sensors and monitoring system, the operation of the motor can be directly and effectively monitored, so as to obtain the most accurate motor operation data. By comparing the motor operation power with vibration anomalies and output anomalies in the form of a time axis plot, it can be confirmed whether the motor operation is within the allowable range. At the same time, the correlation between the motor operation vibration and the motor power can be determined. The temperature of the motor itself and the temperature of the motor heat dissipation components are detected. When an abnormal alarm occurs in the motor temperature, it can assist the management personnel in judging the temperature fault location of the DC motor, facilitating the management personnel to carry out targeted maintenance on the motor and ensuring the normal operation of the motor operation monitoring and alarm system.

Description

Technical Field

[0001] The present invention relates to the field of DC motors, and in particular to a DC motor with an operation monitoring and alarm function. Background Art

[0002] A DC motor refers to a rotating electrical machine that can convert DC electrical energy into mechanical energy or convert mechanical energy into DC electrical energy; it is an electrical machine that can realize the mutual conversion of DC electrical energy and mechanical energy; when it operates as a motor, it is a DC motor that converts electrical energy into mechanical energy. The structure of a DC motor should consist of two major parts: a stator and a rotor. When a DC motor is operating, the stationary part is called the stator, and the main function of the stator is to generate a magnetic field, which is composed of a frame, main poles, commutating poles, end covers, bearings, and a brush device, etc.; the rotating part during operation is called the rotor, and its main function is to generate electromagnetic torque and induced electromotive force, which is the hub for the energy conversion of a DC motor, so it is usually also called the armature, and it is composed of a shaft, an armature core, an armature winding, a commutator, and a fan, etc.

[0003] Currently, there are still deficiencies in the DC motors in the prior art. The existing DC motors need external monitoring components to monitor the operation of the DC motors during operation. When the external monitoring components are installed, abnormal data supervision may occur due to insufficient installation coupling, and there is a lag and a large error in the abnormal supervision of the operation of the DC motors, which has an adverse impact on the monitoring and alarm function during the operation of the DC motors;

[0004] In view of the above technical problems, the present application proposes a solution. Summary of the Invention

[0005] In the present invention, when monitoring the operation of a DC motor, through the built-in sensors and monitoring system, the operation of the motor can be directly and effectively monitored, so as to obtain the most accurate motor operation data, and by means of plotting on the time axis, the motor operation power is compared with vibration abnormalities and output abnormalities, which can confirm whether the motor operation is within the allowable range, and at the same time, the correlation between the motor operation vibration and the motor power can be determined, which is convenient for management personnel to carry out targeted maintenance on the motor, ensure the normal operation of the motor operation monitoring and alarm system, and solve the problem that the external motor operation monitoring system affects the operation monitoring and alarm function of the DC motor due to insufficient installation coupling, and thus a DC motor with an operation monitoring and alarm function is proposed.

[0006] The object of the present invention can be achieved by the following technical solutions:

[0007] A DC motor with a running monitoring and alarm function includes a motor body. A base is fixedly installed on the lower surface of the motor body, and the installation of the DC motor is achieved through the base. An output shaft is installed on one side of the motor body. A connection plate is fixedly installed on the same side as the output shaft. A plurality of mounting holes are circumferentially distributed on the outer side of the connection plate, and the output position of the DC motor is fixed through the mounting holes. A control box is fixedly installed on the upper surface of the motor body. A heat dissipation window is opened at one end of the motor body opposite to the output shaft, and a heat dissipation fan is arranged inside the heat dissipation window;

[0008] A variety of sensors for detecting the operation of the motor are installed inside the control box. The operation parameters of the motor are collected by the sensors and sent to the DC motor monitoring system inside the control box.

[0009] As a preferred embodiment of the present invention, the DC motor monitoring system includes a vibration monitoring unit, a thermoelectric monitoring unit, an output monitoring unit, and a central control unit. The central control unit is used to control the operating power of the DC motor, obtain the operating power, and generate a power time axis according to the operating power;

[0010] The output monitoring unit monitors the output power of the output end of the DC motor, generates an output time axis, and analyzes according to the output time axis and the power time axis to generate an output normal signal or an output damaged signal;

[0011] The thermoelectric monitoring unit monitors the temperature and heat dissipation temperature of the DC motor, analyzes the heat dissipation capacity according to the monitoring results, and generates a heat dissipation abnormal signal or an abnormal heating signal;

[0012] The vibration monitoring unit analyzes the vibration condition of the DC motor, and obtains the motor vibration analysis result and the vibration correlation signal according to the vibration condition.

[0013] As a preferred embodiment of the present invention, the central control unit collects and records the power of the DC motor when the DC motor is working, draws a time axis according to the collection time of the operating power in chronological order, and records the operating power according to the collection time in the time axis, denoted as the power time axis.

[0014] As a preferred embodiment of the present invention, the output monitoring unit draws a time axis based on the time of detecting the output power of the DC motor output terminal, records the output power on the time axis to obtain the output time axis. The output monitoring unit obtains the power time axis through the central control unit, compares the power time axis with the output time axis coaxially, calculates the difference between the output power and the operating power at the same time point to obtain the output power difference, and calculates the variance of the output power difference at each time point using the variance formula to obtain the average output power difference. The average output power difference is compared with a preset output loss threshold. If the output power difference is greater than the preset output loss threshold, an output damaged signal is generated. If the average output power difference is less than or equal to the preset output loss threshold, an output normal signal is generated.

[0015] As a preferred embodiment of the present invention, the thermoelectric monitoring unit detects the temperature of the DC motor and compares the temperature of the DC motor with a preset temperature threshold. If the temperature of the DC motor is greater than or equal to the preset temperature threshold, a temperature too high signal is generated. If the temperature of the DC motor is less than the preset temperature threshold, a temperature normal signal is generated;

[0016] After the thermoelectric monitoring unit generates a temperature too high signal, the thermoelectric monitoring unit collects the temperature of the gas discharged from the heat dissipation window and records it as the heat dissipation temperature, collects the amount of gas discharged from the heat dissipation window and records it as the exhaust gas volume. The thermoelectric monitoring unit analyzes the formula based on the exhaust gas volume, heat dissipation temperature, and the temperature of the DC motor to obtain the heat dissipation coefficient of the DC motor. The thermoelectric monitoring unit compares the heat dissipation coefficient with a preset heat dissipation coefficient. If the heat dissipation coefficient is greater than or equal to the preset coefficient threshold, indicating that the heat dissipation ability is qualified, an abnormal heating signal is generated. If the heat dissipation coefficient is less than the preset coefficient threshold, indicating that the heat dissipation ability is unqualified, a heat dissipation abnormal signal is generated.

[0017] As a preferred embodiment of the present invention, the vibration information collected by the vibration monitoring unit for the DC motor is the vibration amplitude. The vibration detection unit records the time point of collecting the vibration information as the collection point, draws the time axis of the collection point in the horizontal direction, and marks the vibration information on the time axis according to the collection time, denoted as the vibration time axis;

[0018] The vibration monitoring unit obtains the maximum vibration amplitude on the vibration time axis and compares the maximum vibration amplitude with a preset amplitude threshold. If the maximum vibration amplitude is greater than the preset amplitude threshold, an amplitude exceeding standard signal is generated;

[0019] If the maximum vibration amplitude is less than the preset amplitude threshold, a preset low amplitude value is selected through the cloud. All the vibration amplitudes on the vibration time axis are compared with the preset low amplitude value. The acquisition points with vibration amplitudes greater than the preset low amplitude value are recorded as valid vibration points, and the acquisition points with vibration amplitudes less than the preset low amplitude value are recorded as invalid vibration points. The vibration monitoring unit calculates the proportion of valid vibration points among all the acquisition points, which is recorded as the vibration ratio. The vibration monitoring unit compares the vibration ratio with the ratio threshold. If the vibration ratio is greater than the ratio threshold, a vibration anomaly signal is generated. If the vibration ratio is less than the ratio threshold, a vibration normal signal is generated.

[0020] As a preferred embodiment of the present invention, after generating the vibration anomaly signal, the vibration monitoring unit obtains the power time axis through the central control unit, overlaps the power time axis and the vibration time axis, records the operating power corresponding to the valid vibration points therein as i, and records the operating power corresponding to the invalid vibration points therein as m. The vibration monitoring unit sums i to obtain the total vibration power I, sums m to obtain the total steady power M. The vibration monitoring unit obtains the vibration distribution ratio through I / M. If the vibration distribution ratio is within the preset ratio range, a vibration non-correlation signal is generated. If the vibration distribution ratio is less than the lower limit of the preset ratio range, a vibration negative correlation signal is generated. If the vibration distribution ratio is greater than the upper limit of the preset ratio range, a vibration positive correlation signal is generated.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. In the present invention, when monitoring the operation of a DC motor, through the built-in sensors and monitoring system, the motor can be directly and effectively monitored during operation, so as to obtain the most accurate motor operation data, avoiding the data monitoring errors and the lack of fine data acquisition easily caused by insufficient installation coupling of the external monitoring system, and ensuring the normal operation of the motor operation monitoring and alarm system.

[0023] 2. In the present invention, when monitoring the abnormal vibration during the operation of the motor, the real-time changes of the motor operating power and the real-time changes of the motor operation abnormality are obtained by means of time axis plotting, and the real-time changes of the motor operating power and the real-time changes of the motor operation abnormality are compared. It can not only confirm whether the motor operation vibration is within the allowable range, but also determine the correlation between the motor operation vibration and the motor power and speed indicators, which is convenient for managers to carry out targeted maintenance of the motor when a motor operation alarm is generated.

[0024] 3. In the present invention, when monitoring the temperature of the motor, the temperature of the motor itself and the temperature of the motor heat dissipation component are synchronously monitored, so that when an abnormal alarm occurs in the motor temperature, it can assist the management personnel to judge the temperature fault location of the DC motor, and improve the maintenance efficiency and accuracy of the DC motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] For the convenience of those skilled in the art to understand, the present invention will be further described below in conjunction with the accompanying drawings.

[0026] Figure 1 is the front view schematic diagram of the structure of the present invention;

[0027] Figure 2 is the schematic diagram of the heat dissipation window of the present invention;

[0028] Figure 3 is the system block diagram of the present invention.

[0029] In the figure: 1, motor main body; 2, output shaft; 3, connection disk; 4, control box; 5, base; 6, heat dissipation window. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Embodiment 1:

[0032] Please refer to Figure 1 - Figure 3 As shown, a DC motor with an operation monitoring and alarm function includes a motor main body 1. A base 5 is fixedly installed on the lower surface of the motor main body 1, and the DC motor is installed through the base 5. The bottom of the base 5 is shock-absorbed by rubber foot pads. An output shaft 2 is installed on one side of the motor main body 1. A connection disk 3 is fixedly installed on the same side as the output shaft 2. A plurality of mounting holes are circumferentially distributed on the outer side of the connection disk 3, and the output position of the DC motor is fixed through the mounting holes. When the connection disk 3 is connected to the external structure, it is also shock-absorbed by rubber shock-absorbing foot pads. A control box 4 is fixedly installed on the upper surface of the motor main body 1. A heat dissipation window 6 is opened at the end of the motor main body 1 opposite to the output shaft 2, and a heat dissipation fan is arranged inside the heat dissipation window 6;

[0033] Inside the control box 4, there are various sensors for detecting the operation of the motor. The operation parameters of the motor are collected by the sensors and sent to the DC motor monitoring system inside the control box 4. The DC motor monitoring system includes a vibration monitoring unit, a thermoelectric monitoring unit, an output monitoring unit, and a central control unit. The central control unit can control the DC motor to work, adjust the power of the DC motor at the same time, store and record the operating power of the DC motor in the form of data, and send the stored operating power to the vibration monitoring unit, the thermoelectric monitoring unit, and the output monitoring unit. The central control unit draws a time axis according to the time sequence of the acquisition time of the operating power, and records the operating power on the time axis according to the acquisition time, which is recorded as the power time axis.

[0034] The vibration monitoring unit collects the vibration information of the DC motor through the sensor. The collected vibration information is the vibration amplitude. The vibration detection unit records the time point of collecting the vibration information as the acquisition point, draws the time axis in the horizontal direction with the time of the acquisition point, and marks the vibration information on the time axis according to the acquisition time, which is recorded as the vibration time axis;

[0035] The vibration monitoring unit obtains the maximum vibration amplitude on the vibration time axis, and compares the maximum vibration amplitude with the preset amplitude threshold. If the maximum vibration amplitude is greater than the preset amplitude threshold, an amplitude over-limit signal is generated. If the maximum vibration amplitude is less than the preset amplitude threshold, a preset low amplitude value is selected through the cloud, and all the vibration amplitudes on the vibration time axis are compared with the preset low amplitude value. The acquisition points with vibration amplitudes greater than the preset low amplitude value are recorded as effective vibration points, and the acquisition points with vibration amplitudes less than the preset low amplitude value are recorded as invalid vibration points. The vibration monitoring unit calculates the proportion of the effective vibration points in all the acquisition points, which is recorded as the vibration ratio. The vibration monitoring unit compares the vibration ratio with the ratio threshold. If the vibration ratio is greater than the ratio threshold, a vibration anomaly signal is generated. If the vibration ratio is less than the ratio threshold, a vibration normal signal is generated;

[0036] After generating a vibration anomaly signal, the vibration monitoring unit obtains the power time axis through the central control unit, overlaps the power time axis and the vibration time axis to achieve coaxial comparison, records the operating power corresponding to the effective vibration points among them as i, and records the operating power corresponding to the invalid vibration points among them as m. The vibration monitoring unit sums up i to obtain the total vibration power I, sums up m to obtain the stable total power M. The vibration monitoring unit obtains the vibration distribution ratio by I / M. If the vibration distribution ratio is within the preset ratio range, it generates a vibration non-correlation signal, indicating that there is no obvious correlation between the vibration intensity of the motor and the operating power of the motor. If the vibration distribution ratio is less than the lower limit of the preset ratio range, it generates a vibration negative correlation signal, indicating that the vibration amplitude of the motor will increase as the operating power of the motor decreases. If the vibration distribution ratio is greater than the upper limit of the preset ratio range, it generates a vibration positive correlation signal, indicating that the vibration amplitude of the motor will increase as the operating power of the motor increases;

[0037] The vibration monitoring unit sends the vibration anomaly signal and the amplitude exceeding standard signal to the central control unit, and the central control unit generates corresponding alarm reminders. At the same time, the vibration monitoring unit displays the vibration positive correlation signal, the vibration negative correlation signal and the vibration non-correlation signal through the display device.

[0038] Embodiment 2:

[0039] Please refer to Figure 1 - Figure 3 As shown, the thermoelectric monitoring unit detects the temperature of the DC motor through the temperature sensor, and compares the temperature of the DC motor with the preset temperature threshold. If the temperature of the DC motor is greater than or equal to the preset temperature threshold, it generates a temperature too high signal. If the temperature of the DC motor is less than the preset temperature threshold, it generates a temperature normal signal. After the thermoelectric monitoring unit generates a temperature too high signal, the thermoelectric monitoring unit collects the temperature of the gas discharged from the heat dissipation window 6 and records it as the heat dissipation temperature T, collects the gas volume discharged from the heat dissipation window 6 and records it as the exhaust volume S. The thermoelectric monitoring unit obtains the heat dissipation coefficient X of the DC motor through formula analysis. Where q is the preset weight coefficient, the value range of q is greater than 1, t is the temperature of the DC motor. The thermoelectric monitoring unit compares the heat dissipation coefficient with the preset heat dissipation coefficient. If the heat dissipation coefficient is greater than or equal to the preset coefficient threshold, indicating that the heat dissipation ability is qualified, it generates an abnormal heating signal. If the heat dissipation coefficient is less than the preset coefficient threshold, indicating that the heat dissipation ability is unqualified, it generates a heat dissipation anomaly signal;

[0040] The thermoelectric monitoring unit sends abnormal heating signals, over-temperature signals, and abnormal heat dissipation signals to the central control unit. The central control unit generates corresponding alarm reminders according to the signal types and sends them to the management personnel. When the temperature of the DC motor in the over-temperature signal reaches the preset shutdown temperature, the central control unit controls the output part of the DC motor to stop working and controls the fan in the heat dissipation window 6 to continue working.

[0041] Embodiment Three:

[0042] Please refer to Figure 1 - Figure 3 As shown, the output monitoring unit detects the output power at the output end of the DC motor, draws a time axis according to the detection time, records the output power on the time axis to obtain the output time axis. The output monitoring unit obtains the power time axis through the central control unit, makes a coaxial comparison between the power time axis and the output time axis, calculates the difference between the output power and the operating power at the same time point to obtain the output power difference, and calculates the variance of the output power difference at each time point using the variance formula to obtain the average output power difference. The average output power difference is compared with the preset output loss threshold. If the output power difference is greater than the preset output loss threshold, it indicates that there is a large power loss when the DC motor is performing power output, and the bearing friction and coil of the DC motor are damaged, then an output damage signal is generated. If the average output power difference is less than or equal to the preset output loss threshold, an output normal signal is generated;

[0043] The output monitoring unit sends the output damage signal to the central control unit, and the central control unit generates an output damage alarm and issues an audible and visual alarm.

[0044] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only the specific implementation manners. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the relevant technical field can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A DC motor with operation monitoring and alarm function, characterized in that: The motor body (1) comprises a motor main body (1), a base (5) is fixedly mounted on the lower surface of the motor main body (1), and the DC motor is mounted via the base (5); an output shaft (2) is mounted on one side of the motor main body (1), and a connecting plate (3) is fixedly mounted on the same side of the output shaft (2); a plurality of mounting holes are circumferentially distributed on the outer side of the connecting plate (3), and the output position of the DC motor is fixed via the mounting holes; a control box (4) is fixedly mounted on the upper surface of the motor main body (1); a heat dissipation window (6) is provided at the end of the motor main body (1) opposite to the output shaft (2), and a heat dissipation fan is arranged inside the heat dissipation window (6); A plurality of sensors for detecting the operation of the motor are installed inside the control box (4), and the operating parameters of the motor are collected by the sensors and sent to a DC motor monitoring system inside the control box (4); The DC motor monitoring system includes a vibration monitoring unit, a thermoelectric monitoring unit, an output monitoring unit and a central control unit, wherein the central control unit is used to control the operating power of the DC motor, obtain the operating power, and generate a power time axis according to the operating power; The output monitoring unit monitors the output power of the output end of the DC motor, generates an output time axis, performs analysis based on the output time axis and the power time axis, and generates an output normal signal or an output damaged signal; The thermoelectric monitoring unit monitors the temperature and heat dissipation temperature of the DC motor, analyzes the heat dissipation capacity according to the monitoring results, and generates a heat dissipation abnormality signal or an abnormal heating signal; The vibration monitoring unit analyzes the vibration condition of the DC motor and obtains the motor vibration analysis result and the vibration correlation signal according to the vibration condition; The vibration information collected by the vibration monitoring unit for the DC motor is the vibration amplitude, the vibration detection unit records the time point of collecting the vibration information as the collection point, draws the time axis in the horizontal direction of the collection point, and marks the vibration information on the time axis according to the collection time, which is recorded as the vibration time axis; The vibration monitoring unit obtains the maximum vibration amplitude on the vibration time axis, and compares the maximum vibration amplitude with a preset amplitude threshold, and generates an amplitude exceeding standard signal if the maximum vibration amplitude is greater than the preset amplitude threshold; If the maximum vibration amplitude is less than the preset amplitude threshold, a preset low amplitude value is selected through the cloud, all vibration amplitudes on the vibration time axis are compared with the preset low amplitude value, and the collection points with vibration amplitudes greater than the preset low amplitude value are recorded as valid vibration points, and the collection points with vibration amplitudes less than the preset low amplitude value are recorded as invalid vibration points. The vibration monitoring unit calculates the proportion of valid vibration points in all collection points and records it as the vibration ratio. The vibration monitoring unit compares the vibration ratio with the ratio threshold. If the vibration ratio is greater than the ratio threshold, a vibration abnormality signal is generated. If the vibration ratio is less than the ratio threshold, a vibration normal signal is generated. After generating an abnormal vibration signal, the vibration monitoring unit obtains the power time axis through the central control unit, overlaps the power time axis with the vibration time axis, records the operating power corresponding to the valid vibration point as i, and records the operating power corresponding to the invalid vibration point as m. The vibration monitoring unit sums i to obtain the total vibration power I, and sums m to obtain the smooth total power M. The vibration monitoring unit obtains the vibration distribution ratio through I / M. If the vibration distribution ratio is within a preset ratio range, a vibration unrelated signal is generated. If the vibration distribution ratio is less than the preset lower limit of the ratio range, a vibration negative correlation signal is generated. If the vibration distribution ratio is greater than the preset upper limit of the ratio range, a vibration positive correlation signal is generated.

2. The DC motor with operation monitoring and alarm function according to claim 1 is characterized in that: The central control unit collects and records the power of the DC motor when the DC motor is working, draws a time axis according to the time sequence of the collection time of the operating power, and records the operating power in the time axis according to the collection time, which is recorded as the power time axis.

3. The DC motor with operation monitoring and alarm function according to claim 1 is characterized in that: The output monitoring unit draws a time axis according to the time of detecting the output power of the output end of the DC motor, records the output power on the time axis, and obtains the output time axis. The output monitoring unit obtains the power time axis through the central control unit, compares the power time axis with the output time axis coaxially, calculates the difference between the output power and the operating power at the same time point to obtain the output power difference, and calculates the variance of the output power difference at each time point using the variance formula to obtain the average output power difference, and compares the average output power difference with a preset output loss threshold. If the output power difference is greater than the preset output loss threshold, an output damaged signal is generated, and if the average output power difference is less than or equal to the preset output loss threshold, an output normal signal is generated.

4. The DC motor with operation monitoring and alarm function according to claim 1 is characterized in that: The thermoelectric monitoring unit detects the temperature of the DC motor and compares the temperature of the DC motor with a preset temperature threshold. If the temperature of the DC motor is greater than or equal to the preset temperature threshold, a high temperature signal is generated; if the temperature of the DC motor is less than the preset temperature threshold, a normal temperature signal is generated; After the thermoelectric monitoring unit generates an overtemperature signal, the thermoelectric monitoring unit collects the temperature of the gas discharged from the heat dissipation window (6) and records it as the heat dissipation temperature, collects the amount of gas discharged from the heat dissipation window (6) and records it as the exhaust volume, and the thermoelectric monitoring unit performs a formula analysis based on the exhaust volume, the heat dissipation temperature and the temperature of the DC motor to obtain the heat dissipation coefficient of the DC motor. The thermoelectric monitoring unit compares the heat dissipation coefficient with a preset heat dissipation coefficient. If the heat dissipation coefficient is greater than or equal to a preset coefficient threshold, it indicates that the heat dissipation capacity is qualified, and an abnormal heating signal is generated. If the heat dissipation coefficient is less than the preset coefficient threshold, it indicates that the heat dissipation capacity is unqualified, and a heat dissipation abnormality signal is generated.

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