CN111953137A - Motor heat dissipation device and method and electrical equipment - Google Patents
Motor heat dissipation device and method and electrical equipment Download PDFInfo
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- CN111953137A CN111953137A CN202010851001.2A CN202010851001A CN111953137A CN 111953137 A CN111953137 A CN 111953137A CN 202010851001 A CN202010851001 A CN 202010851001A CN 111953137 A CN111953137 A CN 111953137A
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- 230000017525 heat dissipation Effects 0.000 title claims abstract description 57
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
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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
- H02K11/25—Devices for sensing temperature, or actuated thereby
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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
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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
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
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Abstract
The invention discloses a motor heat dissipation device, a motor heat dissipation method and electrical equipment. Wherein, the device includes: the fan blade is arranged on a rotating shaft of the motor; the fan cover covers the motor, an air inlet and an air outlet are formed in the fan cover, the air inlet is located at one end, far away from the fan blades, of the fan cover, the air outlet is located at one end, close to the fan blades, of the fan cover, and the size of the air inlet is adjustably arranged. According to the invention, when the heat dissipation effect of the motor is poor, the air inlet is enlarged, more air flow is led in, the heat dissipation of the surface of the motor is accelerated, the temperature of the motor is favorably reduced, and the service life of the motor is prolonged.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a motor heat dissipation device, a motor heat dissipation method and electrical equipment.
Background
The electric appliances on the market are various in types, and most of the electric appliances are provided with motors. When the motor runs at high speed, the winding temperature of the motor is always kept high, and the surface temperature of the motor is also high according to the inference of temperature gradient data. At the moment, although the environment temperature of the motor is lower than the surface temperature of the motor shell, the temperature difference is small, and the motor cannot dissipate heat because the surface temperature of the motor is not greatly different from the nearby environment temperature. The motor winding can seriously lose the material of the winding when working at high temperature for a long time, and the service life of the motor is influenced, so that the reliability and the service life of the whole electrical equipment are influenced.
Aiming at the problem that the motor cannot dissipate heat due to the fact that the temperature difference between the surface of the motor and the nearby environment is small in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a motor heat dissipation device, a motor heat dissipation method and electrical equipment, and aims to solve the problem that in the prior art, the temperature difference between the surface of a motor and the nearby environment is small, so that the motor cannot dissipate heat.
In order to solve the above technical problem, the present invention provides a heat dissipation device for a motor, wherein the heat dissipation device comprises:
the fan blade is arranged on a rotating shaft of the motor;
the fan cover covers the motor, an air inlet and an air outlet are formed in the fan cover, the air inlet is located at one end, far away from the fan blades, of the fan cover, the air outlet is located at one end, close to the fan blades, of the fan cover, and the size of the air inlet is adjustably arranged.
Further, the apparatus further comprises:
the at least one blade is hinged with the edge of the air inlet, and the size of the air inlet is adjusted by adjusting the opening angle of the blade; the opening angle is an included angle which is larger than zero and formed by the plane where the blades are located and the axial direction of the motor.
Further, the apparatus further comprises:
and one end of the supporting mechanism is connected with the base of the motor, and the other end of the supporting mechanism supports the blade and is used for driving the blade to open and close.
Further, the length or the inclination angle of the support mechanism is adjustable.
Further, along the air inlet to the air outlet direction, the cross-sectional area of the fan housing is gradually reduced.
Further, the apparatus further comprises:
and the driving mechanism is connected with the motor and is used for driving the motor to move between the air inlet and the air outlet.
Further, the apparatus further comprises:
the first temperature sensor is arranged on the surface of the motor and used for detecting the surface temperature of the motor;
the second temperature sensor is arranged at the air inlet and used for detecting the air inlet temperature of the fan cover;
the third temperature sensor is arranged at the air outlet and used for detecting the air outlet temperature of the fan cover; the surface temperature of the motor, the air inlet temperature and the air outlet temperature are used for adjusting the size of the air inlet.
The invention also provides electrical equipment which comprises the motor and the motor heat dissipation device.
Further, the electrical device comprises at least one of:
air conditioner, washing machine, refrigerator, water heater, fan, drying-machine, air purifier, water purification machine.
The invention also provides a motor heat dissipation method, which is applied to the motor heat dissipation device and comprises the following steps:
acquiring the surface temperature of the motor, the air inlet temperature of the fan cover and the air outlet temperature of the fan cover;
and adjusting the size of an air inlet of the fan cover according to the surface temperature of the motor, the air inlet temperature and the air outlet temperature.
Further, according to the surface temperature of motor, the inlet air temperature with the size of the air intake of air-out temperature regulation fan housing, include:
calculating a first difference value between the air outlet temperature and the air inlet temperature;
calculating a second difference value between the surface temperature of the motor and the air outlet temperature;
adjusting the opening angle of the blades on the fan cover according to the relative deviation of the second difference and the first difference; wherein the greater the relative deviation, the greater the opening angle.
Further, the relative deviation is calculated according to the following formula:
the relative deviation is (second difference-first difference)/Ln (second difference/first difference).
Further, after acquiring the surface temperature of the motor, the inlet air temperature of the fan housing, and the outlet air temperature of the fan housing, the method further includes:
calculating a first difference value between the air outlet temperature and the air inlet temperature;
and controlling the motor to move along the axial direction of the motor according to the first difference.
Further, controlling the motor to move along the axial direction thereof according to the first difference value comprises:
if the first difference is larger than or equal to a first preset value, controlling the motor to move towards the air inlet;
if the first difference value is greater than or equal to a second preset value and smaller than the first preset value, controlling the motor to keep still;
and if the first difference value is smaller than the second preset value, controlling the motor to move towards the air outlet.
Further, before controlling the motor to move along the axial direction thereof according to the first difference, the method further comprises:
determining the magnitude of the movement from the first difference.
Further, after calculating a first difference between the outlet air temperature and the inlet air temperature, the method further includes:
obtaining the temperature change rate of the taking wind;
and correcting the first difference value according to the change rate of the air outlet temperature.
Further, the first difference value is corrected according to the change rate of the outlet air temperature, and the correction is realized according to the following formula:
the corrected first difference is equal to the first difference + the change rate of the outlet air temperature.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described motor heat dissipation method.
By applying the technical scheme of the invention, the fan cover is arranged and covers the outside of the motor, the fan cover is provided with the air inlet and the air outlet, the air inlet is arranged at one end, far away from the fan blade, of the fan cover, the air outlet is arranged at one end, close to the fan blade, of the fan cover, the size of the air inlet can be adjustably arranged, and the air guide area can be adjusted by adjusting the size of the air inlet, so that the air inlet can be enlarged, more air flow can be introduced, the surface heat dissipation of the motor can be accelerated, the temperature of the motor can be reduced, and the service life of the motor can be prolonged.
Drawings
Fig. 1 is a structural view of a heat dissipating device according to an embodiment of the present invention;
fig. 2 is a structural view of a heat dissipating device according to another embodiment of the present invention;
FIG. 3 is an internal structural view of a support mechanism according to the present invention
FIG. 4 is a schematic view of a blade opening and closing process according to an embodiment of the present invention;
FIG. 5 is a schematic view of a blade opening and closing process according to another embodiment of the present invention;
fig. 6 is an internal structural view of a drive mechanism according to an embodiment of the present invention;
FIG. 7 is a flow chart of a heat dissipation method according to an embodiment of the invention;
fig. 8 is a control architecture diagram of a method of dissipating heat from a motor according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe differences in embodiments of the present invention, these differences should not be limited to these terms. These terms are only used to distinguish between different differences. For example, a first difference may also be referred to as a second difference, and similarly, a second difference may also be referred to as a first difference, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
This embodiment provides a heat dissipation device for a motor, and fig. 1 is a structural diagram of the heat dissipation device according to the embodiment of the present invention, as shown in fig. 1, the heat dissipation device includes:
the fan blade 1 is arranged on a rotating shaft 3 of the motor 2 and is driven by the rotating shaft 3 to rotate; the fan cover 4 covers the motor 2, an air inlet 41 and an air outlet 42 are formed in the fan cover 4, the air inlet 41 is located at one end, far away from the fan blades 1, of the fan cover 4, the air outlet 42 is located at one end, close to the fan blades 1, of the fan cover 4, and the size of the air inlet 41 is adjustable.
The rotation of the fan blades 1 drives the surrounding air to flow, and the pressure intensity at the position with large air flow velocity is small, so that the pressure intensity of the air outlet 42 of the fan cover is lower than that of the air inlet 41, low-temperature air in the environment where the motor is located enters from the air inlet 41 due to pressure difference, the air outlet 42 is discharged, the low-temperature air is limited in a certain space range through the fan cover 4, and the low-temperature air is discharged after being subjected to sufficient heat exchange with the surface of the motor. The air hood is used for isolating the air area to form air pressure difference so as to change the air flow speed on the surface of the motor, thereby realizing the cooling of the surface of the motor.
The motor heat dissipation device of this embodiment, set up fan housing 4, the cover is established in the outside of motor 2, air intake 41 and air outlet 42 have been seted up on the fan housing, air intake 41 is located the one end of keeping away from fan blade 1 on the fan housing, air outlet 42 is located the one end that is close to fan blade 1 on fan housing 4, the size of air intake 41 is adjustable to be set up, through the size of adjusting air intake 41, adjust the wind-guiding area, can be when motor 2 radiating effect is relatively poor, increase air intake 41, leading-in more air current, accelerated motor 2 surface cooling, be favorable to reducing the temperature of motor 2, improve motor 2's life.
Example 2
In this embodiment, another heat dissipation apparatus for a motor is provided, and fig. 2 is a structural diagram of a heat dissipation apparatus according to another embodiment of the present invention, in order to implement changing the size of the air inlet 41, as shown in fig. 2, the apparatus includes:
the blade 5 is hinged with the edge of the air inlet 41, and the size of the air inlet 41 is adjusted by adjusting the opening angle of the blade 5; the opening angle is an included angle theta formed by a plane where the blade 5 is located and the axial direction of the motor 2, wherein theta is larger than zero. In this embodiment, the shape of the air inlet 41 is a rectangle, the number of the blades is two, and the two blades are respectively and correspondingly disposed on two opposite sides of the rectangular air inlet 41, of course, the air inlet 41 may also be set as polygons such as a triangle and a pentagon, or irregular shapes, as long as at least one of the sides is a straight line, the blades can be hinged thereon, the number of the blades may also be set according to the air inlet 41 and actual needs, and may be 1 or 2, or more, the setting mode may be interval setting, and may be set on two opposite sides of the air inlet, or may be one blade on each side of the air inlet 41.
Since the size of the air inlet 41 needs to be adjusted by opening and closing the blades 5, and the opening and closing of the blades 5 needs power, as shown in fig. 2, the above-mentioned apparatus further includes: the supporting mechanism 6 is preferably a supporting rod, one end of the supporting mechanism 6 is connected with the base 7 of the motor 2, and the other end of the supporting mechanism 6 supports the blade 5 and is used for driving the blade 5 to open and close; the base 7 is connected with the motor 2 through the rotating shaft 3.
Fig. 3 is an internal structure view of a support mechanism according to the present invention, in which the opening angle θ of the blade 5 is adjusted by adjusting the length of the support mechanism 6, specifically, as shown in fig. 3, the support mechanism 6 is a telescopic bar, the bar includes at least a first section 61 and a second section 62, the hollow portion of the second section 62 forms a cylinder 63, and the length of the overlapping portion of the first section 61 and the second section 62 is shortened and the bar is extended by charging air into the cylinder 63, wherein the length of the bar is longer as the air charged into the cylinder is larger, and the air in the cylinder is not changed after the adjustment to a desired length, thereby stabilizing the bar at a certain length. It should be noted that, this embodiment only shows a specific implementation manner of changing the length of the supporting mechanism, and in the specific implementation process, the length of the loop bar may also be changed by other manners, for example, by using a snap connection, a threaded connection, etc. between different sections of the loop bar, and by changing the length of the overlapping portion between different sections of the loop bar, the loop bar is extended and retracted.
Fig. 4 is a schematic view illustrating the opening and closing processes of the vane according to the embodiment of the present invention, as shown in fig. 4, the supporting mechanism 6 is fixed on the base 7, the opening angle θ of the vane 5 becomes larger when the supporting mechanism 6 is extended, and the opening angle θ of the vane 5 becomes smaller when the supporting mechanism 6 is shortened.
Fig. 5 is a schematic view of the opening and closing process of the blade according to another embodiment of the present invention, as shown in fig. 5, one end of the supporting mechanism 6 is movably connected to the blade 5, and the other end is movably connected to the base 7, and the opening angle of the blade 5 is adjusted by adjusting the inclination angle of the supporting mechanism 6, wherein the smaller the inclination angle β of the supporting mechanism 6 relative to the plane of the base 7 is, the larger the opening angle θ of the blade 5 is, and the larger the inclination angle β of the supporting mechanism 6 relative to the plane of the base 7 is, the smaller the opening angle θ of the blade 5 is.
It should be noted that, as can be seen from fig. 1 in the above embodiment, after the opening angle of the vane 5 exceeds 90 °, the opening angle of the opening vane is further increased, and the size of the tuyere is not changed, so in the actual control process, θ is smaller than 90 °.
In the above embodiment, due to the action of the fan blades, the low-temperature gas flows in the fan housing, and according to the venturi principle, when the gas or liquid flows in the pipeline, the dynamic pressure reaches the maximum value at the narrowest part of the pipeline, the static pressure reaches the minimum value, and the speed of the gas rises due to the reduction of the cross-sectional area of the through-flow. The entire inrush current is subjected to the pipe reduction process at the same time, and the pressure is reduced at the same time. Thereby creating a pressure differential that can be used to provide an external suction to the fluid. Therefore, in order to increase the flow rate of the gas, the flow area of the gas flow is gradually reduced along the direction from the air inlet 41 to the air outlet 42, that is, the area of the air inlet 41 is relatively large, and the area of the air outlet 42 is relatively small, the cross-sectional area of the fan housing is gradually decreased along the direction from the air inlet 41 to the air outlet 42, and the shape of the fan housing is similar to the shape of a tilted funnel, so that the flow speed of the gas at the air outlet 42 is increased.
Because of the combined action of the fan blade and the fan housing, the air flow speed at the air outlet 42 is the fastest, the air flow speed at the air inlet 41 is the slowest, the faster the air flow speed is, and the faster the heat dissipation is, therefore, in order to adjust the heat dissipation speed of the motor surface, the heat dissipation of the motor can be accelerated or slowed down by moving the motor 2 in the direction of the air inlet 41 or in the direction of the air outlet 42, and in order to make the motor 2 move along the axial direction thereof, the device further comprises:
a driving mechanism 8 connected to the motor 2 for driving the motor 2 to move between the air inlet 42 and the air outlet 41, fig. 6 is an internal structure diagram of the driving mechanism according to the embodiment of the present invention, as shown in fig. 6, the driving mechanism 8 includes a first air chamber 81, a second air chamber 82, an air wall 83, a piston 84, and a push rod 85, two ends of the push rod 85 are respectively fixedly connected to the motor 2 and the piston 84, when the heat dissipation effect of the motor 2 is good, the motor is moved toward the air inlet 41 to achieve the balance of the heat dissipation speed, and when the heat dissipation effect of the motor 2 is poor, the motor is moved toward the air outlet 42 to accelerate the surface heat dissipation of the motor 2; if the motor 2 needs to move towards the air inlet (right direction in the figure), the first air chamber 81 is filled with air, the piston 84 is pushed to move rightwards, the second air chamber 82 is exhausted, the push rod 85 is pushed to move rightwards at the same time, and the motor 2 is driven to move rightwards, similarly, if the motor 2 needs to move towards the air outlet (left direction in the figure), the second air chamber 82 is filled with air, the piston 84 is pushed to move leftwards, the first air chamber 81 is exhausted, and the push rod 85 is pushed to move leftwards at the same time, so that the motor 2 is driven to move leftwards.
According to the difference and distance induction of the air outlet temperature and the air inlet temperature of the fan cover, the relative position between the fan and the fan cover is regulated and controlled by a driving mechanism 8 connected with a rotating shaft 3 of the motor 2, and the air flow speed on the surface of the fan is controlled.
In order to obtain the heat dissipation condition of the motor 2, it is necessary to obtain the surface temperature of the motor, the inlet air temperature and the outlet air temperature of the fan housing, and therefore, the device further includes: a first temperature sensor 9 arranged on the surface of the motor 2 and used for detecting the temperature of the surface of the motor 2; the second temperature sensor 10 is arranged at the air inlet 41 and used for detecting the air inlet temperature of the fan cover; and the third temperature sensor 11 is arranged at the air outlet 42 and used for detecting the air outlet temperature of the fan cover. The heat dissipation condition of the motor is judged according to the surface temperature of the motor, the air inlet temperature and the air outlet temperature of the fan cover, and then the opening angle of the blade 5 and/or the movement of the motor are controlled. The motor heat dissipation device of the embodiment can adjust the heat dissipation speed in real time according to the actual heat dissipation condition, and the heat dissipation speed on the surface of the motor is guaranteed to be constant.
Example 3
This embodiment provides a heat dissipation method for a motor, and fig. 7 is a flowchart of the heat dissipation method according to the embodiment of the present invention, as shown in fig. 7, the method includes:
s501, acquiring the surface temperature Tc of the motor, the air inlet temperature Ti of the fan cover and the air outlet temperature To of the fan cover.
During specific implementation, the surface temperature of the motor is detected and obtained through the first temperature sensors arranged on the surface of the motor, during specific implementation, in order to guarantee data accuracy, a plurality of first temperature sensors can be arranged on the surface of the motor, a plurality of temperature measurement values are obtained, an average value is obtained, in order to further guarantee data accuracy, before the average value is calculated, a minimum temperature measurement value can be eliminated, a maximum temperature measurement value is eliminated, the rest temperature measurement values are averaged, or a temperature range is set, and after the temperature measurement values which are not in the temperature range are eliminated, the average value is calculated. For example: the temperature range [ Tave-0.5, Tave +0.5] is set, where Tave is the average of all temperature measurements.
The air inlet temperature of the fan cover is obtained through detection of the second temperature sensor at the air inlet, and the air inlet temperature of the fan cover is detected through the third temperature sensor arranged at the air outlet. It should be noted that, when detecting the inlet air temperature and the outlet air temperature, a method of obtaining a plurality of temperature measurement values and averaging may also be adopted, and the specific steps are similar to the detection of the surface temperature of the motor and are not described herein again.
And S502, adjusting the size of an air inlet of the fan cover according To the surface temperature Tc, the air inlet temperature Ti and the air outlet temperature To of the motor.
The heat dissipation condition of the motor can be judged through the surface temperature Tc of the motor, the air inlet temperature Ti and the air outlet temperature To of the fan cover, the size of the air inlet of the fan cover is adjusted according To the current heat dissipation speed of the motor, the air guide area of the air inlet is further adjusted, and the heat dissipation speed of the motor is further adjusted.
According To the motor heat dissipation method, the size of the air inlet is adjusted by obtaining the surface temperature Tc of the motor, the air inlet temperature Ti of the fan cover and the air outlet temperature To of the fan cover, so that the air guide area is adjusted, when the heat dissipation effect of the motor is poor, the air inlet can be enlarged, more air flows can be guided in, the surface heat dissipation of the motor is accelerated, the temperature of the motor is favorably reduced, and the service life of the motor is prolonged.
Example 4
In this embodiment, another motor heat dissipation method is provided, in order To accurately control the size of the air inlet of the fan housing based on the surface temperature Tc of the motor, the air inlet temperature Ti and the air outlet temperature To of the fan housing, the step S502 specifically includes: calculating a first difference value delta T1 between the outlet air temperature To and the inlet air temperature Ti; calculating a second difference value delta T2 between the surface temperature Tc of the motor and the air outlet temperature To; adjusting the opening angle of the vane according to the relative deviation of the second difference Δ T2 and the first difference Δ T1; if the relative deviation is small, the heat dissipation effect is better, and the opening angle of the blade is small, so that the heat dissipation requirement of the motor can be met; the relative deviation is great, and it is relatively poor to show the radiating effect, and the blade needs to open great angle and just can satisfy the radiating demand of motor, and consequently, the relative deviation is big more, and the opening angle of the blade of fan housing is big more. Specifically, the opening angle θ is (Δ T2- Δ T1)/Ln (Δ T2/Δ T1) × γ, where γ is an angle reference amount, as can be seen from fig. 1 in the above embodiment, if θ is less than 0 °, the function of expanding the air inlet cannot be performed, and after θ exceeds 90 °, the opening angle of the opening blade is further increased without changing the size of the air inlet, so that, in the actual control process, θ is greater than 0 ° and less than 90 °, when θ is obtained by calculation by the formula and is less than 0 °, θ is 0 °, and when θ is obtained by calculation by the formula and is greater than 90 °, θ is 90 °.
In this embodiment, the relative deviation is (Δ T2- Δ T1)/Ln (Δ T2/Δ T1), and in other embodiments of the present invention, the relative deviation may also be calculated by constructing other functions for Δ T1 and Δ T2, for example, the relative deviation is Δ T1/(Δ T2- Δ T1).
Due To the combined action of the fan blades and the fan cover, the air at the air outlet has the fastest flowing speed, the air at the air inlet has the slowest flowing speed, the faster the air flowing speed is, and the faster the heat dissipation is, therefore, the heat dissipation of the motor can be accelerated or slowed down by moving the motor To the air inlet or the air outlet, and therefore, after the surface temperature Tc of the motor, the air inlet temperature Ti of the fan cover and the air outlet temperature To of the fan cover are obtained, the axial movement of the motor can be controlled according To the first difference value delta T1 between the air outlet temperature To and the air inlet temperature Ti.
Specifically, if Δ T1 is greater than or equal to T1, the difference between the temperature of the air outlet and the temperature of the air inlet is large, which indicates that the heat exchange effect is good, and the motor is controlled to move towards the air inlet; if T2 is less than or equal to delta T1 is less than T1, controlling the motor to keep still; if the delta T1 is less than T2, controlling the motor to move towards the air outlet direction; the value of T1 and T2 is determined according to a temperature range that the internal winding of the motor can bear, and when the temperature difference between the temperature of the air outlet and the temperature of the air inlet is greater than a predetermined value in the highest ambient environment, the temperature of the internal winding of the motor is lower than a lower maximum temperature limit that the internal winding of the motor can bear, the value is set to T1, and when the temperature difference between the temperature of the air outlet and the temperature of the air inlet is lower than a predetermined value in the highest ambient environment, the temperature of the internal winding of the motor exceeds an upper maximum temperature limit that the internal winding of the motor can bear, the value is set to T2.
In order to accurately control the motor movement, it is also necessary to determine the amplitude of the movement from said first difference Δ T1 before controlling the motor movement along its axis according to said first difference Δ T1. Specifically, when the motor is controlled to move towards the air inlet direction, the larger the first difference Δ T1 is, the larger the movement amplitude is, and assuming that the coordinate of a reference point on the motor in the initial state in the axial direction of the motor is η, the coordinate after the movement is η 1+ a × Δ T1, and the movement amplitude is proportional to Δ T1; when the motor is controlled to move towards the air outlet, the smaller the first difference value delta T1 is, the larger the movement amplitude is, the coordinate after movement is eta 2-eta-A/delta T1, the movement amplitude is in inverse proportion to delta T1, wherein A is a movement amplitude reference quantity, and the coordinate eta of a reference point in the axial direction of the motor is obtained through a position sensor.
In practical applications, the temperature of the outlet may change rapidly, and at this time, if the opening angle of the fan cover blade or the movement of the motor is controlled according To the first difference Δ T1, the control delay may be caused, and the control accuracy may be reduced, so that after the first difference Δ T1 between the outlet air temperature To and the inlet air temperature Ti is calculated, the method further includes: acquiring the change rate of the outlet air temperature To; correcting the first difference DeltaT 1 according To the change rate of the outlet air temperature To; the corrected first difference Δ T1 is the first difference Δ T1+ the outlet air temperature change rate Δ T3, and specifically, the outlet air temperature change rate Δ T3 is Tot-Tot-60Wherein, TotTo the current outlet air temperature, Tot-60The air outlet temperature is 60s before. By correcting the first difference Δ T1, more accurate control is achieved.
Example 5
In this embodiment, another method for dissipating heat from a motor is provided, and fig. 8 is a control architecture diagram of the method for dissipating heat from a motor according to an embodiment of the present invention, as shown in fig. 8, including a parameter setting module, a motherboard, and a display panel, the method comprises the steps of setting a first preset value T1 and a second preset value T2 through a parameter setting module, inputting a functional relation between the opening angle of blades of a fan cover and the inlet air temperature Ti and the outlet air temperature To of the fan cover and a functional relation between the moving amplitude and the inlet air temperature Ti and the outlet air temperature To of the fan cover, collecting a surface temperature signal of a motor, an inlet air temperature signal of the fan cover and a position signal of the motor by a mainboard controller, calculating and outputting a blade opening angle control signal of the fan cover and a moving direction and moving amplitude control signal of the motor through a control strategy, controlling the opening angle of the fan cover blade and the moving direction and amplitude of the motor through the analog quantity control signal and the digital quantity control signal; the current control information is displayed through the display panel.
The specific control method comprises the following steps:
s1, setting a calculation function relation of the fan cover blade control opening angle theta: θ (Δ T2- Δ T1/Ln (Δ T2/Δ T1)) × γ, the value of θ ranges from 0 to α, wherein α is smaller than 90 °; and setting a function relation of a first preset value T1, a second preset value T2 and the movement amplitude of the condition threshold value of the motor moving along the axial direction.
S2, monitoring the surface temperature Tc of the motor corresponding to the cold air outlet in real time, and in order to ensure the accuracy of data, arranging a plurality of temperature sensors on the surface of the motor, wherein the detection values of all the temperature sensors are T1, T2 and T3 … Tn respectively; calculating an average value, namely Tc (T1+ T2+ T3+ … Tn)/n;
s3, monitoring the air outlet temperature To and the air inlet temperature Ti of the fan cover in real time;
s4, calculating a control temperature difference delta T1 ═ To-Ti; calculating the end temperature difference delta T2 as Tc-To; calculating the wind temperature change rate delta T3 ═ Tot-Tot-60Wherein, TotTo the current outlet air temperature, Tot-60The air outlet temperature is 60s before.
And S5, controlling the opening angle theta according to the delta T1 and the delta T2.
S6, controlling the moving direction and amplitude of the motor according to the delta T1, the delta T2 and the delta T3, and specifically comprising the following steps:
when Δ T1+ Δ T3 is equal to or greater than T1, η 1 ═ η + a (Δ T1+ Δ T3); namely, the motor is controlled to move towards the air inlet, and the larger the value of delta T1+ delta T3 is, the larger the movement amplitude is;
when T2 is more than or equal to delta T1+ delta T3 is more than T1, eta is unchanged;
when the value of Δ T1+ Δ T3 is not greater than T2, η 2 is η -a/(Δ T1+ Δ T3), that is, the motor is controlled to move towards the air outlet, and the smaller the value of Δ T1+ Δ T3 is, the larger the movement amplitude is; wherein A is a movement amplitude reference quantity, and the values of T1 and T2 are determined according to the temperature control range of the internal winding of the motor given by the motor specification.
Through the steps, the requirement for cooling the surface of the motor can be met, the surface of the motor can be uniformly cooled, the problem that partial regions are excessively cooled to cause motor condensation or insufficient cooling to cause partial loss of the motor is avoided, and the purpose of prolonging the service life of the motor is achieved. Meanwhile, the invention also widens the working operation range of the motor, thereby improving the long-term climate adaptation capability of the dryer and further improving the long-term operation reliability of the whole electrical equipment.
Example 6
The embodiment of the invention provides electrical equipment, which comprises a motor and a motor heat dissipation device, wherein the motor heat dissipation device is used for increasing heat exchange airflow and accelerating the surface heat dissipation of the motor when the heat dissipation effect of the motor is poor, so that the temperature of the motor is reduced, the service life of the motor is prolonged, and the service life of the whole electrical equipment is prolonged. The electrical equipment at least comprises one of the following components:
air conditioner, washing machine, refrigerator, water heater, fan, drying-machine, air purifier, water purification machine.
Example 7
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the motor heat dissipation method in the above-described embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (18)
1. A heat sink for an electric motor, the heat sink comprising:
the fan blade (1) is arranged on a rotating shaft of the motor (2);
the fan cover (4) is covered outside the motor (2), an air inlet (41) and an air outlet (42) are formed in the fan cover (4), the air inlet (41) is formed in the fan cover (4) and is located at one end far away from the fan blade (1), the air outlet (42) is formed in the fan cover (4) and is located at one end close to the fan blade (1), and the size of the air inlet (41) is adjustably arranged.
2. The apparatus of claim 1, further comprising:
at least one blade (5) hinged with the edge of the air inlet (41), and the size of the air inlet (41) is adjusted by adjusting the opening angle of the blade (5); the opening angle is an included angle which is larger than zero and formed by the plane where the blades (5) are located and the axial direction of the motor (2).
3. The apparatus of claim 2, further comprising:
and one end of the supporting mechanism (6) is connected with the base (7) of the motor (2), and the other end of the supporting mechanism supports the blade (5) and is used for driving the blade (5) to open and close.
4. A device according to claim 3, characterized in that the length or the angle of inclination of the support means (6) is adjustable.
5. The device according to claim 1, wherein the cross-sectional area of the hood decreases gradually from the air inlet (41) to the air outlet (42).
6. The apparatus of claim 1, further comprising:
and the driving mechanism (8) is connected with the motor (2) and is used for driving the motor (2) to move between the air inlet (42) and the air outlet (41).
7. The apparatus of claim 1, further comprising:
a first temperature sensor (9) arranged on the surface of the motor (2) and used for detecting the surface temperature of the motor (2);
the second temperature sensor (10) is arranged at the air inlet (41) and used for detecting the air inlet temperature of the air cover;
the third temperature sensor (11) is arranged at the air outlet (42) and used for detecting the air outlet temperature of the fan cover; the surface temperature of the motor (2), the air inlet temperature and the air outlet temperature are used for adjusting the size of the air inlet (41).
8. An electrical apparatus comprising an electrical machine, characterized in that the electrical apparatus further comprises a heat sink for an electrical machine as claimed in any one of claims 1 to 7.
9. The electrical device of claim 8, wherein the electrical device comprises at least one of:
air conditioner, washing machine, refrigerator, water heater, fan, drying-machine, air purifier, water purification machine.
10. A heat dissipation method for a motor, applied to the heat dissipation device for a motor according to any one of claims 1 to 7, the method comprising:
acquiring the surface temperature of the motor, the air inlet temperature of the fan cover and the air outlet temperature of the fan cover;
and adjusting the size of an air inlet of the fan cover according to the surface temperature of the motor, the air inlet temperature and the air outlet temperature.
11. The method of claim 10, wherein adjusting the size of the air inlet of the hood based on the surface temperature of the motor, the inlet air temperature, and the outlet air temperature comprises:
calculating a first difference value between the air outlet temperature and the air inlet temperature;
calculating a second difference value between the surface temperature of the motor and the air outlet temperature;
adjusting the opening angle of the blades on the fan cover according to the relative deviation of the second difference and the first difference; wherein the greater the relative deviation, the greater the opening angle.
12. The method of claim 11, wherein the relative deviation is calculated according to the following equation:
the relative deviation is (second difference-first difference)/Ln (second difference/first difference).
13. The method of claim 10, wherein after obtaining the surface temperature of the motor, the inlet air temperature of the hood, and the outlet air temperature of the hood, the method further comprises:
calculating a first difference value between the air outlet temperature and the air inlet temperature;
and controlling the motor to move along the axial direction of the motor according to the first difference.
14. The method of claim 13, wherein controlling the motor to move axially along the motor based on the first difference comprises:
if the first difference is larger than or equal to a first preset value, controlling the motor to move towards the air inlet;
if the first difference value is greater than or equal to a second preset value and smaller than the first preset value, controlling the motor to keep still;
and if the first difference value is smaller than the second preset value, controlling the motor to move towards the air outlet.
15. The method of claim 13, wherein prior to controlling the motor to move axially along the motor based on the first difference, the method further comprises:
determining the magnitude of the movement from the first difference.
16. The method of any of claims 11 to 15, wherein after calculating the first difference between the outlet air temperature and the inlet air temperature, the method further comprises:
obtaining the temperature change rate of the taking wind;
and correcting the first difference value according to the change rate of the air outlet temperature.
17. The method of claim 16, wherein the first difference is modified based on the rate of change of the outlet air temperature by the following equation:
the corrected first difference is equal to the first difference + the change rate of the outlet air temperature.
18. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the method for dissipating heat of an electric motor according to any one of claims 10 to 17.
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| CN202010851001.2A CN111953137A (en) | 2020-08-21 | 2020-08-21 | Motor heat dissipation device and method and electrical equipment |
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