CN115622478B - Method for controlling pre-tightening force of motor bearing - Google Patents
Method for controlling pre-tightening force of motor bearing Download PDFInfo
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- CN115622478B CN115622478B CN202211636213.4A CN202211636213A CN115622478B CN 115622478 B CN115622478 B CN 115622478B CN 202211636213 A CN202211636213 A CN 202211636213A CN 115622478 B CN115622478 B CN 115622478B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/25—Devices for sensing temperature, or actuated thereby
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
Abstract
The invention relates to the technical field of rolling bearings, in particular to a method for controlling the pre-tightening force of a motor bearing, which comprises a control mechanism, a shell, a rotor, a bearing, a base and a pre-tightening mechanism, wherein the rotor, the pre-tightening mechanism and the base are all arranged in the shell, and the bearing is sleeved between the rotor and the shell; the base is connected in pretension mechanism, pretension mechanism is including the elastic component, adjust the axial thrust that the base drove the elastic component and applyed to the bearing through control mechanism, can provide the compensation to the pretightning force of the spring that is in different rotational speeds in real time, the influence of factors such as the motor difference rotational speed of having alleviated that exists among the prior art, decide rotor axial expansion size difference, lead to spring deflection and bearing pretightning force also to change, the condition of bearing under pretension or pretension takes place easily, long-term operation can accelerate the technical problem of bearing wearing and tearing, the service life of equipment has been promoted.
Description
Technical Field
The invention relates to the technical field of rolling bearing motors, in particular to a method for controlling pre-tightening force of a motor bearing.
Background
The fluid machine is a machine which takes fluid as working medium to carry out energy conversion, and is widely applied to production and manufacturing in industries such as petrochemical industry and the like along with popularization of energy conservation and emission reduction; with the development of fluid machinery, higher and larger requirements are also put forward on the rotating speed and the power of a motor; according to the prior art it has been shown that the motor speed is normally set above 20000 rad/m.
At present, a high-speed motor usually adopts a magnetic suspension bearing and an angular contact bearing to realize the bearing work of the motor; however, the magnetic suspension bearing is complex to control and is not suitable for all working conditions due to high bearing cost and a plurality of matched devices; although the cost of the angular contact bearing is reduced compared with a magnetic suspension bearing, the angular contact bearing needs to be pre-tightened by the spring deformation when in use, and the spring deformation and the bearing pre-tightening force are also changed under the influence of factors such as different rotating speeds and heating of a motor, different axial expansion sizes of a stator and a rotor and the like, so that the condition that the bearing is under-pre-tightened or over-pre-tightened is easy to occur, the bearing is accelerated to be worn after long-term operation, the vibration among bearing parts is promoted, and the service life of equipment is shortened.
Disclosure of Invention
The invention aims to provide a method for controlling pre-tightening force of a motor bearing, which aims to solve the technical problems that in the prior art, because an angular contact bearing needs to be pre-tightened by spring deformation when in use, the spring deformation and the bearing pre-tightening force are changed and the bearing is easy to be under-pre-tightened or over-pre-tightened due to the influence of factors such as different rotating speeds and heating of motors, different axial expansion sizes of stators and rotors and the like, the bearing abrasion is accelerated after long-term operation, the vibration among bearing parts is promoted, and the service life of equipment is shortened.
In a first aspect, the invention provides a method for controlling a pre-tightening force of a motor bearing, which comprises a control mechanism, a shell, a rotor, a bearing, a base, a pre-tightening mechanism and a stator, wherein the rotor, the pre-tightening mechanism and the base are all arranged in the shell, and the bearing is sleeved between the rotor and the shell;
the base is connected with the pre-tightening mechanism, the pre-tightening mechanism comprises an elastic part, and the control mechanism is used for adjusting axial thrust which is applied to the bearing by the elastic part driven by the base;
the control mechanism comprises a controller and a sensor assembly, the sensor assembly comprises a temperature sensor, and the controller is connected with the temperature sensor;
and the temperature sensors are used for respectively acquiring the temperature data of the stator, and the method comprises the following steps:
s11, acquiring temperature rise data of the stator and axial displacement data of the rotor, determining a proportional relation between temperature rise change of the stator and axial displacement change of the rotor according to the acquired data, and setting the proportional relation as a first proportional coefficient;
s12, collecting temperature rise data of the base and axial expansion data of the base, determining the proportional relation between the temperature rise change of the base and the axial expansion change of the base according to the collected data, and setting the proportional relation as a second proportional coefficient;
s13, determining the proportional relation between the temperature rise of the stator and the temperature rise of the base according to the axial displacement variation of the rotor and the axial expansion variation of the base, and setting the proportional relation as a third proportional coefficient;
the controller respectively sets a base reference temperature change value and a stator reference temperature change value according to a third proportionality coefficient;
s14, starting the motor, receiving a first output frequency of a frequency converter of the motor by the controller, obtaining the temperature rise of the motor, and comparing the sum of the temperature rise data of the motor and the ambient temperature of the motor with the temperature of the stator after the temperature sensor collects the temperature of the stator in real time;
s15, when the sum of the temperature rise data of the motor and the ambient temperature where the motor is located is larger than the temperature of the stator, the controller raises the temperature of the base according to a third proportionality coefficient;
when the sum of the temperature rise data of the motor and the temperature of the environment where the motor is located is smaller than the temperature of the stator, the controller reduces the temperature of the base according to a third proportionality coefficient;
and stopping the adjustment of the temperature of the base by the controller until the difference value between the temperature difference value of the stator and the sum of the temperature rise data of the motor and the ambient temperature where the motor is located is smaller than the base reference temperature change value.
With reference to the first aspect, the present invention provides a first possible implementation manner of the first aspect, wherein the controller adjusts the base reference temperature change value of one unit for the base according to the third scaling factor for each change of the temperature rise of the stator by the stator reference temperature change value of one unit.
In combination with the first aspect, the present invention provides a second possible implementation manner of the first aspect, wherein,
and when the temperature rise of the stator changes by one unit of the stator reference temperature change value, the controller adjusts one unit of the base reference temperature change value for the base according to the third proportionality coefficient.
With reference to the first possible implementation manner of the first aspect, the present disclosure provides a third possible implementation manner of the first aspect, wherein the sensor assembly further includes a shaft displacement sensor for monitoring an axial expansion amount of the rotor;
the base comprises a temperature control unit, and the controller is connected to the temperature control unit; the method comprises the following steps:
s21, starting the motor, collecting the temperature of the temperature control unit after the controller receives the output power of the motor, and starting the shaft displacement sensor;
s22: the controller sets a reference shaft displacement variation, and the reference shaft displacement variation and the base reference temperature variation are set according to the second proportional coefficient;
s23, when the axial displacement sensor monitors that the axial variation of the rotor is larger than the axial displacement variation of the base, the controller raises the temperature of the base;
when the axial displacement sensor monitors that the axial variation of the rotor and the axial variation of the rotor at the previous time are smaller than the axial displacement variation of the base, the controller reduces the temperature of the base;
and when the axial expansion amount of the rotor is smaller than the displacement variation of the seat shaft, the controller stops adjusting the temperature of the base.
With reference to the first possible implementation manner of the first aspect, the present invention provides a fourth possible implementation manner of the first aspect, wherein when the motor is changed to the second output power, the controller readjusts the temperature of the base according to the data collected by the shaft displacement sensor.
With reference to the first possible implementation manner of the first aspect, the present invention provides a fifth possible implementation manner of the first aspect, wherein a heat generating element is disposed in the base, the base can be heated to generate expansion along the elastic direction of the elastic element, and the base can be cooled to generate retraction opposite to the expansion direction.
With reference to the first possible implementation manner of the first aspect, the present invention provides a sixth possible implementation manner of the first aspect, wherein the pre-tightening mechanism further includes a push plate, a bearing seat is disposed between the bearing and the push plate, and the push plate is connected between the bearing seat (410) and the elastic member (610).
With reference to the first possible implementation manner of the first aspect, the present invention provides a seventh possible implementation manner of the first aspect, wherein the bearing seat is provided with a baffle plate adapted to the push plate.
With reference to the first possible implementation manner of the first aspect, the present invention provides an eighth possible implementation manner of the first aspect, wherein the controller is a PLC, and the PLC is respectively connected to the shaft displacement sensor and the temperature sensor.
With reference to the first possible implementation manner of the first aspect, the present invention provides a ninth possible implementation manner of the first aspect, wherein the shaft displacement sensor is mounted on a peripheral side of the elastic member.
The embodiment of the invention has the following beneficial effects: the controller can determine a third proportionality coefficient of the temperature rise of the stator and the temperature rise of the base according to the combination of the first proportionality coefficient and the second proportionality coefficient, and can adjust the temperature of the base according to the third proportionality coefficient according to the data collected by the temperature sensor, and the elastic element connected with the base can apply axial thrust to the bearing under the change of the temperature of the base; the technical problem that the angular contact bearing is subjected to pre-tightening through the spring deformation when in use, the spring deformation and the bearing pre-tightening force are changed due to the influences of factors such as different rotating speeds, different heating of motors, different axial expansion sizes of stators and rotors and the like, the bearing under-pre-tightening or over-pre-tightening condition is easy to occur, the bearing is subjected to accelerated bearing abrasion in long-term operation is solved, and the service life of equipment is prolonged.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of an internal structure of an apparatus for controlling a preload of a bearing of a motor according to an embodiment of the present invention;
fig. 2 is a schematic control logic diagram of a control mechanism in the method for controlling the preload of the motor bearing according to the embodiment of the invention.
Icon: 100-a control mechanism; 110-a controller; 120-a sensor assembly; 121-axis displacement sensor; 122-a temperature sensor; 200-a housing; 300-a rotor; 400-a bearing; 410-a bearing seat; 500-a base; 510-a temperature control unit; 600-a pre-tightening mechanism; 610-an elastic member; 620-push plate.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The physical quantities in the formula, if not individually labeled, are to be understood as basic quantities of the international system of units, or derived quantities derived from the basic quantities by mathematical operations such as multiplication, division, differentiation or integration.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the control mechanism may be in a "manual mode", "electric mode", "pneumatic mode", "gas-liquid linkage", "electro-hydraulic linkage", or the like. The specific meaning of the above-described manner of action in the present invention can be understood in a specific case by those of ordinary skill in the art.
Example one
As shown in fig. 1 and fig. 2, the method for controlling the pre-tightening force of the motor bearing 400 provided by the present invention includes a control mechanism 100, a housing 200, a rotor 300, a bearing 400, a base 500, a pre-tightening mechanism 600 and a stator, wherein the rotor 300, the pre-tightening mechanism 600 and the base 500 are all installed in the housing 200, and the bearing 400 is sleeved between the rotor 300 and the housing 200; the base 500 is connected to the pre-tightening mechanism 600, the pre-tightening mechanism 600 includes an elastic member 610, and the control mechanism 100 is configured to adjust an axial thrust force applied to the bearing 400 by the elastic member 610 driven by the base 500; the control mechanism 100 comprises a controller 110 and a sensor assembly 120, wherein the sensor assembly 120 comprises a temperature sensor 122, and the controller 110 is connected to the temperature sensor 122; and the temperature sensors 122 are used for respectively collecting the temperature data of the stator, and the steps thereof are as follows:
s11, collecting temperature rise data of a stator and axial displacement data of the rotor 300, determining a proportional relation between temperature rise change of the stator and axial displacement change of the rotor 300 according to the collected data, and setting as a first proportional coefficient;
s12, acquiring temperature rise data of the base 500 and axial expansion data of the base, determining the proportional relation between the temperature rise change of the base 500 and the axial expansion change of the base 500 according to the acquired data, and setting the proportional relation as a second proportional coefficient;
s13, determining the proportional relation between the temperature rise of the stator and the temperature rise of the base 500 according to the axial displacement variation of the rotor 300 and the axial expansion variation of the base 500, and setting the proportional relation as a third proportional coefficient;
the controller 110 respectively sets a base reference temperature change value and a stator reference temperature change value according to the third proportionality coefficient;
s14, starting the motor, wherein the controller 110 receives the first output frequency of the frequency converter of the motor and obtains the temperature rise of the motor, and after the temperature sensor 122 collects the temperature of the stator in real time, the controller 110 compares the sum of the temperature rise data of the motor and the ambient temperature where the motor is located with the temperature of the stator;
s15, when the sum of the temperature rise data of the motor and the ambient temperature of the motor is greater than the temperature of the stator, the controller 110 raises the temperature of the base 500 according to a third proportionality coefficient;
when the sum of the temperature rise data of the motor and the ambient temperature of the motor is less than the temperature of the stator, the controller 110 reduces the temperature of the base 500 according to the third proportionality coefficient;
the controller 110 stops the adjustment of the temperature of the base 500 until the difference between the sum of the temperature rise data of the motor and the ambient temperature where the motor is located and the temperature of the stator is less than the base reference temperature variation value.
The rotor 300, the pre-tightening mechanism 600 and the base are all installed in the housing 200, and the bearing 400 is sleeved between the rotor 300 and the housing 200, the base is connected to the pre-tightening mechanism 600, the pre-tightening mechanism 600 comprises an elastic member 610, when the pre-tightening force of the bearing 400 is adjusted, because the temperature rise change of the stator and the axial displacement change of the rotor 300 are in a linear relationship, and the temperature rise change of the base 500 and the axial expansion change of the base 500 are also in a linear relationship, therefore, the controller 110 can determine a third proportionality coefficient between the temperature rise of the stator and the temperature rise of the base 500 through the combination of the first proportionality coefficient and the second proportionality coefficient, because the controller 110 is connected to the temperature sensor 122, the controller 110 can adjust the temperature of the base 500 according to the data collected by the temperature sensor 122, and can apply axial thrust to the bearing 400 by the elastic member 610 connected to the base 500 under the change of the temperature of the base 500; the technical problem that the angular contact bearing 400 is easy to be under-pre-tightened or over-pre-tightened due to the fact that the angular contact bearing 400 is pre-tightened by the spring deformation when in use, the spring deformation and the pre-tightening force of the bearing 400 are changed under the influence of factors such as different rotating speeds and different heating of motors, different axial expansion sizes of the stator and the rotor 300 and the like in the prior art, the abrasion of the bearing 400 is accelerated after long-term operation is solved, and the service life of equipment is prolonged.
It should be noted that, the above technical solution is applicable to machines such as fluid machines, in which the rotation speed of the motor is proportional to the power of the motor, and the rotation speed of the fluid machine depends on the output frequency of the frequency converter, that is, the output frequency of the frequency converter is proportional to the temperature of the motor, so that the user can calculate the temperature rise data of the motor by the output frequency of the frequency converter.
Further, the controller 110 adjusts the base reference temperature variation value of one unit for the base 500 according to the third scale factor for every stator reference temperature variation value of one unit of the temperature rise of the stator.
When the motor runs, the pretightening force of the bearing 400 changes along with the heating expansion of the rotor 300, the pretightening force is gradually reduced when the temperature of the rotor 300 is higher, when the pretightening force of the bearing 400 approaches the lower limit, the controller 110 controls the temperature of the base at the moment, the expansion speed of the base is gradually increased to be the same as the change rate of the heating expansion of the rotor 300, and the pretightening force of the bearing 400 stops descending.
It should be noted that the reference temperature change value indicates that when the preload approaches the limit, the temperature change of the base, which makes the preload return to the initial position due to thermal stability, is determined by a user according to a limited number of experiments, so as to ensure that the preload of the bearing is always in a good range.
Further, when the motor is changed to the second output power, the controller 110 compares the sum of the temperature rise data of the motor at the second output power and the ambient temperature of the motor with the temperature of the stator again.
When the output power of the inverter in the motor changes, because the output power and the temperature rise of the motor have a linear relationship, the controller 110 needs to compare the temperature rise data of the motor at the second output power with the temperature of the environment where the motor is located, and then the temperature of the base 500 is adjusted according to the third proportionality coefficient, so as to realize displacement compensation.
Further, a heating element is disposed in the base 500, the base 500 can be heated to expand along the elastic direction of the elastic element 610, and the base 500 can be cooled to retract in the direction opposite to the expansion direction.
Further, the pre-tightening mechanism 600 further comprises a push plate 620, a bearing seat 410 is arranged between the bearing 400 and the push plate 620, and the push plate 620 is connected between the bearing seat 410 and the elastic member 610.
Further, the bearing housing 410 is provided with a baffle adapted to the push plate 620.
When the rotor 300 rotates, one end of the rotor 300 close to the bearing 400 drives the bearing 400 to move, and since the bearing seat 410 is arranged between the bearing 400 and the push plate 620, the push plate 620 is connected between the bearing seat 410 and the elastic member 610, and the elastic member 610 drives the push plate 620 to push the baffle of the bearing seat 410 under the expansion action of the base 500, thereby applying a pre-tightening force to the bearing 400.
Example two
According to the method for controlling the pre-tightening force of the motor bearing, provided by the invention, the sensor assembly 120 further comprises a shaft displacement sensor 121, wherein the shaft displacement sensor 121 is used for monitoring the axial expansion amount of the rotor;
the base 500 includes a temperature control unit 510, and the controller 110 is connected to the temperature control unit 510; the method comprises the following steps:
s21, starting the motor, collecting the temperature of the temperature control unit 510 after the controller 110 receives the output power of the frequency converter of the motor, and starting the shaft displacement sensor 121;
s22: the controller 110 sets a reference axis displacement variation, and the reference axis displacement variation and the reference temperature variation of the base 500 are set according to a second proportionality coefficient;
s23, when the axial displacement sensor 121 monitors that the axial change of the rotor is larger than the axial displacement change of the base 500, the controller 110 raises the temperature of the base 500;
when the axial displacement sensor 121 monitors that the difference between the axial variation of the rotor and the axial variation of the previous rotor is smaller than the axial displacement variation of the base 500, the controller 110 reduces the temperature of the base 500;
until the axial expansion amount of the rotor is smaller than the seat shaft displacement variation amount, the controller 110 stops the adjustment of the temperature of the base 500.
When the rotation speed of the motor is not proportional to the power of the motor, the axial variation of the rotor can be directly collected by the shaft displacement sensor 121 through the arrangement of the shaft displacement sensor 121 and the temperature control unit 510, and as the temperature rise of the base 500 and the axial expansion of the base 500 are in a linear relationship, as can be seen from the above, the displacement variation of the shaft of the base 500 can be set to represent the displacement generated by the shaft displacement of the base 500 during the period that the pretightening force is close to the limit value, that is, during the period of the base reference temperature variation value.
Can be equipped with the temperature sensing material that can carry out temperature regulation and control such as resistance wire in the base 500, during the axial displacement variation volume of accessible sensor subassembly 120 with rotor 300 spreads into controller 110 into, controller 110 sends the signal to base 500, realizes the control of base 500 temperature, specifically is:
when the data of the axial displacement variation of the rotor 300 is greater than the reference shaft displacement variation, the controller 110 sends a temperature increase signal to the base 500, the temperature of the base 500 increases under the action of a temperature sensing material arranged inside the base 500, and the base 500 expands under heat, so as to push the elastic member 610, and enable the elastic member 610 to apply an axial thrust to the bearing 400, thereby achieving the pre-tightening effect of the bearing 400;
when the motor runs for a period of time, the motor is converted from a hot state to a cold state, the output power page of the frequency converter connected with the motor is decreased, and when the controller 110 monitors that the data of the absolute value of the difference between the axial displacement variation of the rotor 300 and the previous axial displacement variation is smaller than the reference shaft displacement variation, it indicates that the pretightening force applied by the elastic member 610 to the bearing 400 approaches a required value, and the controller 110 stably reduces the temperature of the base 500 according to a first proportional coefficient between the temperature rise data of the base 500 and the axial expansion data of the base 500, so that the pretightening force of the bearing 400 is adjusted more flexibly.
When the difference between the data of the axial displacement variation of the rotor 300 and the reference shaft displacement variation is negative, it indicates that the pretightening force applied by the elastic member 610 to the bearing 400 exceeds the tolerance range, and the temperature of the base 500 needs to be reduced by the controller 110, and meanwhile, the controller 110 does not change the temperature of the base 500 until the axial displacement variation of the rotor 300 is within the preset tolerance range.
It should be noted that, what reference shaft displacement variation shows is that when the pretightening force is close to the limit, the maximum distance that the base thermal stability makes the pretightening force return to the initial position, and the user can confirm this reference temperature variation value according to the experiment of limited number, guarantees that the bearing pretightening force is in a good scope all the time.
Further, when the motor is changed to the second output power, the controller adjusts the temperature of the susceptor 500 again according to the data collected by the shaft displacement sensor 121.
Further, the sensor assembly 120 includes a shaft displacement sensor 121 and a temperature sensor 122, and the controller 110 is a PLC connected to the shaft displacement sensor 121 and the temperature sensor 122, respectively.
The shaft displacement sensor 121 is configured to monitor data such as an axial displacement variation of the rotor 300 and an axial expansion amount of the base 500, and the temperature sensor 122 is configured to monitor data such as a temperature rise of the base 500 and a temperature rise of the stator.
Further, the shaft displacement sensor 121 is mounted on the circumferential side of the elastic member 610.
The shaft displacement sensor 121 is mounted on the periphery of the elastic member 610, so that data collection of the shaft displacement sensor 121 is guaranteed, and collection precision is improved.
It should be noted that, when acquiring the temperature rise data of the stator, the axial displacement variation of the rotor 300, the temperature rise of the susceptor 500, and the axial expansion amount data of the susceptor 500, the initial point may be set to O degrees, or other temperatures may be set as required.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The method for controlling the pre-tightening force of the motor bearing is characterized by comprising a control mechanism (100), a shell (200), a rotor (300), a bearing (400), a base (500), a pre-tightening mechanism (600) and a stator, wherein the rotor (300), the pre-tightening mechanism (600) and the base (500) are all installed in the shell (200), and the bearing (400) is sleeved between the rotor (300) and the shell (200);
the base (500) is connected to the pre-tightening mechanism (600), the pre-tightening mechanism (600) comprises an elastic part (610), and the control mechanism (100) is used for adjusting the axial thrust which is applied to the bearing (400) by the base (500) and drives the elastic part (610);
the control mechanism (100) comprises a controller (110) and a sensor assembly (120), wherein the sensor assembly (120) comprises a temperature sensor (122), and the controller (110) is connected to the temperature sensor (122);
and the temperature sensors (122) are used for respectively collecting the temperature data of the stator, and the steps are as follows:
s11, acquiring temperature rise data of the stator and axial displacement data of the rotor (300), determining a proportional relation between temperature rise change of the stator and axial displacement change of the rotor (300) according to the acquired data, and setting the proportional relation as a first proportional coefficient;
s12, acquiring temperature rise data of the base (500) and axial expansion data of the base (500), determining a proportional relation between temperature rise change of the base (500) and axial expansion change of the base (500) according to the acquired data, and setting the proportional relation as a second proportional coefficient;
s13, determining the proportional relation between the temperature rise of the stator and the temperature rise of the base (500) according to the axial displacement variation of the rotor (300) and the axial expansion variation of the base (500), and setting as a third proportional coefficient;
the controller (110) respectively sets a base reference temperature change value and a stator reference temperature change value according to a third proportional coefficient;
s14, starting the motor, receiving a first output frequency of a frequency converter of the motor by the controller (110), obtaining the temperature rise of the motor, and comparing the sum of the temperature rise data of the motor and the ambient temperature of the motor with the temperature of the stator by the controller (110) after the temperature sensor (122) collects the temperature of the stator in real time;
s15, when the sum of the temperature rise data of the motor and the ambient temperature where the motor is located is larger than the temperature of the stator, the controller (110) raises the temperature of the base (500) according to a third proportionality coefficient;
when the sum of the temperature rise data of the motor and the ambient temperature of the motor is less than the temperature of the stator, the controller (110) reduces the temperature of the base (500) according to a third proportionality coefficient;
and stopping the adjustment of the temperature of the base (500) by the controller (110) until the difference between the temperature difference between the stator and the sum of the temperature rise data of the motor and the ambient temperature where the motor is located is smaller than the reference temperature change value of the base (500).
2. The method for motor bearing pretension control according to claim 1, wherein said controller (110) adjusts said base (500) for a base reference temperature change value of one unit per change of stator reference temperature change value of one unit of temperature rise of said stator according to said third scaling factor.
3. The method for motor bearing pretension control according to claim 2, wherein when the motor is modified to a second output power, the controller (110) re-compares the temperature rise data of the motor at the second output power with the temperature of the environment in which the motor is located after adding the temperature rise data to the temperature of the stator.
4. The method for motor bearing preload control as claimed in claim 2, wherein said sensor assembly further comprises a shaft displacement sensor (121), said shaft displacement sensor (121) being adapted to monitor an amount of axial expansion of said rotor;
the base (500) comprises a temperature control unit (510), and the controller (110) is connected to the temperature control unit (510);
the method comprises the following steps:
s21, starting the motor, collecting the temperature of the temperature control unit (510) after the controller (110) receives the output power of the frequency converter of the motor, and starting the shaft displacement sensor (121);
s22: the controller sets a reference shaft displacement variation, and the reference shaft displacement variation and the base reference temperature variation are set according to the second proportional coefficient;
s23, when the axial displacement sensor (121) monitors that the axial variation of the rotor is larger than the axial displacement variation of the base, the controller (110) raises the temperature of the base (500);
when the shaft displacement sensor (121) monitors that the difference between the axial variation of the rotor and the axial variation of the rotor at the previous time is smaller than the base shaft displacement variation, the controller (110) reduces the temperature of the base (500);
and when the axial expansion amount of the rotor is smaller than the seat shaft displacement variation, the controller stops adjusting the temperature of the base (500).
5. The method for motor bearing pretension control according to claim 4, characterized in that when the motor is modified to a second output power, the controller (110) readjusts the temperature of the base (500) according to the data collected by the shaft displacement sensor (121).
6. The method for controlling the preload of the motor bearing as claimed in claim 3, wherein a heat generating element is provided in the base (500), the base (500) is heated to expand along the elastic direction of the elastic element (610), and the base (500) is cooled to retract opposite to the expansion direction.
7. The method for motor bearing preload control as claimed in claim 5, wherein the preload mechanism (600) further comprises a push plate (620), a bearing seat (410) is provided between the bearing (400) and the push plate (620), and the push plate (620) is connected between the bearing seat (410) and the elastic member (610).
8. The method for motor bearing preload control as claimed in claim 7, wherein said bearing seat (410) is provided with a baffle adapted to said push plate (620).
9. The method for motor bearing preload control as claimed in claim 5, wherein the controller (110) is a PLC and the PLC is connected to the shaft displacement sensor (121) and the temperature sensor (122), respectively.
10. The method for motor bearing preload control as claimed in claim 8, wherein said shaft displacement sensor (121) is mounted on a peripheral side of said elastic member (610).
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