CN115076888A - Motor temperature control method and device and air conditioner - Google Patents

Motor temperature control method and device and air conditioner Download PDF

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Publication number
CN115076888A
CN115076888A CN202210492338.8A CN202210492338A CN115076888A CN 115076888 A CN115076888 A CN 115076888A CN 202210492338 A CN202210492338 A CN 202210492338A CN 115076888 A CN115076888 A CN 115076888A
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China
Prior art keywords
motor
temperature
rotating speed
controlling
cooling device
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CN202210492338.8A
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Chinese (zh)
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CN115076888B (en
Inventor
郝明
张稳
陈体宁
谢金锋
李金玉
刘合心
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/33—Responding to malfunctions or emergencies to fire, excessive heat or smoke
    • F24F11/34—Responding to malfunctions or emergencies to fire, excessive heat or smoke by opening air passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/52—Indication arrangements, e.g. displays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Fluid Mechanics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

The invention discloses a motor temperature control method, a motor temperature control device and an air conditioner, and relates to the technical field of air conditioners, wherein the motor temperature control method comprises the following steps: after the motor is started to operate, monitoring the motor temperature of the motor; wherein, the motor is covered with a cooling device; when the temperature of the motor is greater than or equal to a first preset temperature, controlling the cooling device to be started; and periodically calculating a temperature change value of the motor temperature, and controlling the rotating speed of the motor based on the temperature change value. The invention can avoid the damage of the motor due to overhigh temperature, can ensure that the motor can exert the maximum energy efficiency while ensuring that the temperature is not overhigh, and improves the reliability of the temperature control of the motor.

Description

Motor temperature control method and device and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a motor temperature control method and device and an air conditioner.
Background
At present, a motor is required to be used in a plurality of household electrical appliances, such as a fan motor is required to be used in an air conditioner, the motor is a key component of the electrical appliances, and in the use process of the electrical appliances, because the motor generally needs to continuously do work and has large heat productivity, the maximum rotating speed or the maximum operating current of the motor is generally limited in order to avoid the damage of the motor caused by overhigh temperature of the motor. However, the use scene of the household electrical appliance is complex, if the heat dissipation of the use environment is poor or the household electrical appliance runs for a long time and is dirty, the temperature rise of the motor is still easy to be too high and the motor is damaged, and if the rotating speed limit value of the motor is too low, the maximum energy efficiency of the motor cannot be exerted, so that the cost is wasted, and therefore, the current motor temperature control technology has the problem of low reliability.
Disclosure of Invention
In order to solve the problems, the invention provides a motor temperature control method, a motor temperature control device and an air conditioner, which can avoid damage of the motor due to overhigh temperature, can ensure that the motor can exert the maximum energy efficiency while ensuring that the temperature is not overhigh, and improve the reliability of motor temperature control.
According to an embodiment of the present invention, in one aspect, a method for controlling a temperature of a motor is provided, including: monitoring the motor temperature of the motor after the motor is started to operate; wherein, a cooling device is covered on the motor; when the temperature of the motor is greater than or equal to a first preset temperature, controlling the cooling device to be started; and periodically calculating a temperature change value of the motor temperature, and controlling the rotating speed of the motor based on the temperature change value.
Through adopting above-mentioned technical scheme, cover the heat sink on the motor, and open the heat sink when monitoring motor temperature higher and cool down for the motor, ensure that motor temperature is in reasonable within range, avoid motor temperature too high and damage, through when opening the heat sink, according to the temperature variation value control motor rotational speed of the motor that periodic calculation obtained, it is low excessively to avoid motor rotational speed, make the motor can exert the biggest energy efficiency when guaranteeing that the temperature can not be too high, avoid setting up the lower cost waste that leads to because of the rotational speed limit value, the production complexity and the development complexity of motor have been reduced simultaneously, the reliability of motor temperature control has been promoted.
Preferably, the step of periodically calculating a temperature change value of the motor temperature and controlling the rotation speed of the motor based on the temperature change value includes: calculating the difference value between the motor temperature in the current period and the motor temperature in the previous period to obtain the temperature change value; and when the temperature change value is less than or equal to a second preset temperature, controlling the rotating speed of the motor to rise at a preset change rate until the target rotating speed set by a user is reached.
Through adopting above-mentioned technical scheme, control motor speed and continuously rise when motor temperature's temperature variation value is less, when guaranteeing that motor temperature can not be too high, make the motor can exert the biggest efficiency, but promoted the rotational speed operating range of motor, avoid causing the cost extravagant because of the parameter setting problem.
Preferably, the motor temperature control method further includes: and when the temperature change value is greater than the second preset temperature, controlling the motor to maintain the current rotating speed to operate, and if the duration of the temperature change value greater than the second preset temperature reaches the preset duration, sending a motor temperature abnormity prompt.
By adopting the technical scheme, the motor is controlled to maintain the current rotating speed to operate when the temperature change value of the motor temperature is large, the damage caused by overhigh temperature rise of the motor due to the continuous rising of the rotating speed of the motor is avoided, the high-temperature protection of the motor can be realized without setting a lower rotating speed limit value for the motor, and the production and development complexity of the motor is reduced; through when the temperature variation is continuously in higher level, send motor temperature to the user and remind unusually to remind the user in time to maintain the motor, avoid motor temperature further to rise and damage.
Preferably, the motor temperature control method further includes: when the temperature of the motor is greater than or equal to a third preset temperature and less than the first preset temperature, detecting the current rotating speed of the motor, and calculating a rotating speed difference value between a target rotating speed set by a user and the current rotating speed; and controlling the rotating speed of the motor and the opening and closing state of the cooling device according to the rotating speed difference.
By adopting the technical scheme, the motor rotating speed and the switch of the cooling device are controlled according to the rotating speed difference value between the target rotating speed and the current rotating speed of the motor, so that the influence of the rotating speed change on the stability of the motor is pre-judged, and the influence of the temperature change hysteresis on the temperature control reliability of the motor is avoided.
Preferably, the step of controlling the rotation speed of the motor and the open/close state of the cooling device according to the rotation speed difference includes: when the rotating speed difference value is smaller than or equal to a first rotating speed, controlling the cooling device to be in a closed state, and controlling the motor to operate based on a target rotating speed set by a user; and when the rotating speed difference value is greater than the first rotating speed, controlling the cooling device to be started, and controlling the motor to operate based on a target rotating speed set by a user.
By adopting the technical scheme, when the rotating speed difference value is small, the cooling device is controlled to be in a closed state, the motor is controlled to operate based on the target rotating speed set by the user, the power consumption of the motor can be reduced, and the operation safety of the motor is ensured while the user requirements are met; by opening the cooling device in advance when the rotating speed difference value is large, the risk that the temperature of the motor exceeds the standard when the motor reaches the target rotating speed is reduced, and the stability and the reliability of the operation of the motor are ensured.
Preferably, the motor temperature control method further includes: and when the temperature of the motor is lower than the third preset temperature, controlling the cooling device to be in a closed state, and controlling the motor to operate based on a target rotating speed set by a user.
Through adopting above-mentioned technical scheme, control heat sink is in the off-state when motor temperature is lower, and control motor speed continuously rises to the target rotational speed that the user set up, when guaranteeing that motor temperature can not be too high, satisfies the rotational speed demand of user to the motor.
Preferably, the cooling device covers all or part of the surface of the motor in a surrounding manner, and the cooling device is a semiconductor refrigeration sheet or a refrigerant radiating pipe.
Through adopting above-mentioned technical scheme, encircle at the motor surface and cover the heat sink, can realize the initiative rapid cooling to the motor, avoid appearing dirty stifled temperature rise out of control and damage because of motor service environment heat dissipation is bad or long-term operation, promoted the temperature control effect of motor, reduced the development complexity and the production complexity of motor.
According to an embodiment of the present invention, in another aspect, there is provided a motor temperature control apparatus including: the monitoring module is used for monitoring the motor temperature of the motor after the motor is started to operate; wherein, a cooling device is arranged at the periphery of the motor; the first control module is used for controlling the cooling device to be started when the temperature of the motor is greater than or equal to a first preset temperature; and the second control module is used for periodically calculating the temperature change value of the motor temperature and controlling the rotating speed of the motor based on the temperature change value.
According to an embodiment of the present invention, in another aspect, an air conditioner is provided, including a motor, a cooling device, and a motor controller, where the motor controller includes a computer-readable storage medium storing a computer program and a processor, and when the computer program is read and executed by the processor, the method according to any one of the first aspect is implemented.
According to an embodiment of the present invention, in another aspect, a computer-readable storage medium is provided, which stores a computer program, which when read and executed by a processor, implements the method according to any one of the first aspect.
The invention has the following beneficial effects: through covering heat sink on the motor, and open the heat sink when monitoring motor temperature higher and for the motor cooling, ensure that motor temperature is in reasonable within range, avoid motor temperature too high and damage, through when opening heat sink, according to the temperature variation value control motor rotational speed of the motor that periodic calculation obtained, it is low excessively to avoid motor rotational speed, make the motor can give play to the biggest efficiency when guaranteeing that the temperature can not be too high, avoid setting up the lower cost waste that leads to because of the rotational speed limit, the production complexity and the development complexity of motor have been reduced simultaneously, the reliability of motor temperature control has been promoted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a flow chart of a method for controlling the temperature of a motor according to the present invention;
FIG. 2 is a schematic view of a motor structure according to the present invention;
FIG. 3 is a logic diagram of motor temperature control according to the present invention;
fig. 4 is a schematic structural diagram of a motor temperature control device provided by the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. 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.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The present embodiment provides a motor temperature control method, which can be applied to a controller of a motor in an electrical device, referring to a flow chart of the motor temperature control method shown in fig. 1, and the method mainly includes the following steps S102 to S106:
step S102: and after the motor is started to operate, monitoring the motor temperature of the motor.
Referring to the schematic structural diagram of the motor shown in fig. 2, a cooling device 21 covers the periphery of the motor 20, and a temperature sensor 22 is further disposed on the motor 20 for detecting the temperature of the motor. When the running current or the rotating speed of the motor is detected to be larger than a certain value, the motor is determined to be started to run, and the temperature of the motor is detected in real time based on a temperature sensor arranged on the motor.
In one embodiment, the cooling device may cover all or part of the surface of the motor in a surrounding manner, and the cooling device is a semiconductor cooling plate with adjustable output power or a cooling medium heat dissipation pipe with adjustable cooling medium flow. As shown in fig. 2, the cooling device can cover the whole surface of the motor in a surrounding manner, so that the temperature of the motor can be uniformly and rapidly reduced when the temperature of the motor is higher, and the temperature of the motor is prevented from rising too fast. Through surrounding at the motor surface and covering the heat sink, can realize the initiative rapid cooling to the motor, avoid appearing filthy stifled temperature rise out of control and damage because of motor service environment heat dissipation is bad or long-term operation, promoted the temperature control effect of motor, compare in because of the more needs of motor user demand frequently test the motor temperature rise, reduced the development complexity and the production complexity of motor.
Step S104: and when the temperature of the motor is greater than or equal to a first preset temperature, controlling the cooling device to be started.
Whether the detected motor temperature is larger than or equal to a first preset temperature or not is judged in real time, when the motor temperature is judged to be larger than or equal to the first preset temperature, the current motor temperature is higher, the cooling device is controlled to be started to operate to cool the motor, and the motor is prevented from being burnt due to the fact that the motor temperature continues to rise. The value range of the first preset temperature can be 80-100 ℃, and the preferred value is 90 ℃.
In a feasible implementation manner, after the cooling device is controlled to be started, the operating power or the refrigerant flow of the cooling device can be controlled according to the change condition of the temperature of the motor, when the temperature of the motor rises faster after the cooling device is started, such as when the temperature change value of the motor is greater than a certain value, the output power of the semiconductor refrigeration sheet can be controlled to be increased, or the refrigerant flow of the refrigerant radiating pipe is controlled to be increased, so that the cooling speed of the temperature of the motor is increased.
Step S106: and periodically calculating a temperature change value of the motor temperature, and controlling the rotating speed of the motor based on the temperature change value.
And calculating the difference between the currently detected motor temperature and the motor temperature detected before the time t1 every time t1, and recording the difference as a temperature change value. When the temperature change value of the motor temperature is smaller, the temperature rise of the motor temperature is obviously reduced after the cooling device is started, the cooling effect of the cooling device can meet the heating requirement of the motor, and the rotating speed of the motor can be controlled to be continuously increased so as to meet the rotating speed requirement of electrical equipment on the motor; when the temperature change value of the motor temperature is large, the temperature rise of the motor is still high, the cooling effect of the cooling device cannot meet the requirement of heating of the motor, and the rotating speed of the motor cannot be controlled to be increased, so that the motor is prevented from being burnt due to overhigh temperature rise.
Because the air conditioner designs the wind speed demand more when using the motor, need frequently test motor temperature rise, the work load is great and the material commonality of production and research and development is relatively poor, through when opening the heat sink, according to the temperature variation value control motor speed of motor, on the one hand, need not to set up lower rotational speed limit value for the motor, ensure that the motor can exert the maximum efficiency, on the other hand, but make motor speed operating range wider, the adaptation scope is wider, the production complexity and the development complexity of motor have been reduced simultaneously.
The motor temperature control method provided by the embodiment comprises the steps of covering a cooling device on a motor, opening the cooling device to cool the motor when the temperature of the motor is monitored to be higher, ensuring that the temperature of the motor is within a reasonable range, avoiding damage of the motor due to overhigh temperature, controlling the rotating speed of the motor according to the temperature change value of the motor obtained through periodic calculation when the cooling device is opened, avoiding that the rotating speed of the motor is too low, ensuring that the motor can not exert the maximum energy efficiency when the temperature is not overhigh, avoiding cost waste due to lower setting of the rotating speed limit value, reducing the production complexity and the development complexity of the motor, and improving the reliability of motor temperature control.
In one embodiment, in order to enable the motor to exhibit maximum energy efficiency, the embodiment provides an implementation mode that a temperature change value of the motor temperature is periodically calculated, and the rotation speed of the motor is controlled based on the temperature change value, and the following steps (1) to (3) are specifically referred to for execution:
step (1): and calculating the difference value between the motor temperature in the current period and the motor temperature in the previous period to obtain a temperature change value.
Calculating the temperature change value delta T of the current detected motor temperature and the motor temperature detected before T1 time every T1 time now ＝T now -T (now-1) The value of the duration t1 of each period can be 5-30 s, preferably 10 s.
Step (2): and when the temperature change value is less than or equal to a second preset temperature, controlling the rotating speed of the motor to rise at a preset change rate until the target rotating speed set by a user is reached.
When the temperature change value of the motor temperature is less than or equal to the second preset temperature, the temperature of the motor is indicated to be not increased or decreased under the action of the cooling device, the cooling effect of the cooling device can meet the heating requirement of the motor, the rotating speed of the motor can be increased continuously at a preset change rate until the rotating speed of the motor reaches the target rotating speed set by a user or the rotating speed corresponding to the target gear set by the user, and the rotating speed of the motor is not increased any more.
The preset change rate can be increased by N1 r/min every t3 time, and the value range of t3 can be 10-30 s, preferably 20 s; the value of N1 can be 10-50, preferably 30. The rotating speed of the motor is controlled to continuously rise when the temperature change value of the motor temperature is smaller, the motor temperature is ensured not to be too high, the maximum energy efficiency can be exerted by the motor, the rotating speed running range of the motor is enlarged, and the cost waste caused by the problem of parameter setting is avoided.
And (3): and when the temperature change value is greater than the second preset temperature, controlling the motor to maintain the current rotating speed to operate, and if the duration of the temperature change value greater than the second preset temperature reaches the preset duration, sending a motor temperature abnormity prompt.
The value range of the preset duration can be 5-30 min, and the preferred value is 10 min. When the temperature variation value of the motor temperature is greater than the second preset temperature, the temperature of the motor still rises when the cooling device is opened, the cooling effect of the cooling device cannot meet the heating speed of the motor, the current rotating speed of the motor is detected, the motor is controlled to maintain the current rotating speed to operate, the situation that the motor is damaged due to overhigh temperature rise caused by the fact that the rotating speed of the motor continues to rise is avoided, high-temperature protection of the motor can be achieved without setting a lower rotating speed limit value for the motor, and the production and development complexity of the motor is reduced.
If the motor does not increase the rotating speed any more and keeps the current rotating speed running, the temperature variation is still continuously larger than the second preset temperature, the heating value of the motor is shown to exceed the designed heating value, abnormal heating such as filth blockage or locked rotor and the like can occur in the motor, and the abnormal temperature prompt of the motor is sent to a user to prompt the user to maintain the motor in time, so that the damage caused by the further temperature rise of the motor is avoided. The motor temperature abnormity reminding can comprise any one or more of sound alarm reminding, indicator light reminding and character display reminding.
In an embodiment, in order to reduce the influence of the motor temperature control on the electrical equipment, the motor temperature control method provided in this embodiment further includes the following steps 1) to 3):
step 1): and when the temperature of the motor is greater than or equal to the third preset temperature and less than the first preset temperature, detecting the current rotating speed of the motor, and calculating a rotating speed difference value between the target rotating speed set by the user and the current rotating speed.
The value range of the third preset temperature can be 70-79 ℃, and the preferred value is 75 ℃; when the detected temperature of the motor is greater than or equal to the third preset temperature and less than the first preset temperature, the temperature of the motor is slightly high, the current rotating speed of the motor is further detected, and the rotating speed difference is calculated to be the target rotating speed-the current rotating speed, so that whether the cooling device needs to be started for active cooling is judged according to the difference between the current rotating speed and the target rotating speed.
Step 2): and controlling the rotating speed of the motor and the opening and closing state of the cooling device according to the rotating speed difference.
When the motor temperature is greater than or equal to the third preset temperature and less than the first preset temperature, although the motor temperature does not reach a high state, the risk of exceeding the motor temperature also exists, and whether the motor needs to be actively cooled in advance is further judged according to the difference value between the target rotating speed and the current rotating speed of the motor. The switch of the motor rotating speed and the cooling device is controlled according to the rotating speed difference value between the target rotating speed and the current rotating speed of the motor, so that the influence of rotating speed change on the stability of the motor is predicted, and the influence of temperature change hysteresis on the temperature control reliability of the motor is avoided.
And when the rotating speed difference value is less than or equal to the first rotating speed, controlling the cooling device to be in a closed state, and controlling the motor to operate based on the target rotating speed set by the user. The value range of the first rotating speed can be 30-100 r/min, and preferably 50 r/min.
When the motor temperature is greater than or equal to the third preset temperature and is less than the first preset temperature, if the rotating speed difference value between the target rotating speed and the current rotating speed is small, the fact that the current rotating speed of the motor is close to the target rotating speed set by a user is indicated, and then the fact that the current temperature of the motor is close to the temperature when the motor reaches the target rotating speed is indicated, the motor temperature cannot change greatly. The cooling device is controlled to be in a closed state, so that the power consumption of the motor can be reduced, and the motor is controlled to operate based on the target rotating speed set by the user, so that the operation safety of the motor is guaranteed while the user requirements are met.
And when the rotating speed difference value is greater than the first rotating speed, the cooling device is controlled to be started, and the motor is controlled to operate based on the target rotating speed set by the user. When the difference value between the target rotating speed and the current rotating speed is large, the difference between the current rotating speed of the motor and the target rotating speed is large, if the rotating speed of the motor continues to rise to the target rotating speed, the power and the current of the motor can be greatly increased, and the temperature of the motor can also rise more, so that the current temperature of the motor is far lower than the temperature of the motor at the target rotating speed, the current temperature of the motor is close to a critical value, in order to avoid the continuous increase of the temperature rise of the temperature of the motor, a cooling device is controlled to be started, the motor is actively cooled, and the motor is controlled to run based on the target rotating speed set by a user, so that the rotating speed of the motor gradually rises to the target rotating speed. The cooling device is started in advance to actively cool the motor when the rotating speed difference is large, so that the risk that the temperature of the motor exceeds the standard when the motor reaches the target rotating speed is reduced, and the stability and the reliability of the operation of the motor are guaranteed. The temperature of the motor is actively cooled, so that the cost of the motor is reduced to the maximum extent (the motor can run at a higher rotating speed under the same material design cost); meanwhile, the development complexity of the motor is reduced, the production complexity is reduced (the motor has wider rotating speed range and stronger adaptability), and the universality is improved (the motor models are reduced).
Step 3): and when the temperature of the motor is lower than a third preset temperature, controlling the cooling device to be in a closed state, and controlling the motor to operate based on a target rotating speed set by a user.
When the motor temperature is detected to be lower than the third preset temperature, the current motor temperature is lower, the motor temperature does not have the risk of exceeding the standard, the cooling device is controlled to be in a closed state, the rotating speed of the motor is controlled to continuously rise to the target rotating speed set by a user, and the rotating speed requirement of the user on the motor is met while the motor temperature is not too high.
The motor temperature control method provided by the embodiment monitors the motor temperature, controls the cooling device and the motor rotating speed according to the interval where the motor temperature is located, avoids damage caused by out-of-control fan temperature rise due to insufficient motor scene consideration, unreasonable parameter setting or device aging and the like, and actively cools the motor when high-temperature risk exists in the motor, exerts the motor energy efficiency to the maximum extent, avoids cost waste caused by low motor rotating speed limit value, and meanwhile, the motor can run at a wider wind speed range and has a wider adaptation range, and production complexity and development workload are reduced.
Corresponding to the motor temperature control method provided in the foregoing embodiment, an embodiment of the present invention provides an example of performing motor temperature control by using the above motor temperature control method, referring to a motor temperature control logic diagram shown in fig. 3, and specifically referring to the following steps 1 to 4:
step 1, after the motor is started, continuously detecting the current motor temperature T now Current motor speed F now Target motor speed F object The cooling device is not turned on by default. On the premise of ensuring the operation reliability of the motor, the energy consumption of the air conditioner is saved as much as possible.
Step 2, if the motor temperature T now And (4) opening the cooling device to control the rotating speed of the motor according to the temperature change value of the motor, wherein the temperature is not less than T1.
Calculating the temperature difference delta T of the motor every T1 time now ＝T now -T (now-1) If Δ T now T2 is not more than, the cooling effect of the cooling device can meet the requirement that the motor generates heat, the rotating speed of the motor can be continuously increased, and the rotating speed of the motor is controlled to be increased by N1 r/min every T3 time until the target rotating speed is reached.
If Δ T now If the rotating speed is more than T2, the cooling effect of the cooling device cannot meet the requirement of heating of the motor, and the motor is controlled to maintain the current rotating speed F now If the motor lasts for T2 time, maintain delta T now If the temperature is more than T2, the abnormal temperature of the motor is indicated.
Wherein the range of the T1 is 80-100 ℃, and the preferred temperature is 90 ℃; the range of T2 is-3-1 ℃, and 0 ℃ is preferred; the range of t1 is 5-30 s, preferably 10 s; the t2 is in the range of 5-30 min, preferably 10 min.
Step 3, if the temperature T3 of the motor is not more than T now If T1 is less than the preset value, the rotating speed difference value between the target rotating speed and the current rotating speed of the motor is calculated (F is equal to F) object -F now )。
Referring to a table showing the control relation among the motor temperature, the rotating speed difference value and the cooling device in the following table, if delta F is less than or equal to N1, the cooling device is not started, the rotating speed of the motor freely runs, and the rotating speed of the motor is controlled to gradually increase to the target rotating speed. When the difference value of the rotating speeds is small, the motor temperature is close to the stable motor temperature with the final rotating speed reaching the target, and the motor temperature cannot change greatly; if the motor temperature has allowance at the moment, the temperature requirement can be met, the risk is controllable, and active cooling is not needed.
If delta F is larger than N1, the cooling device is started in the front, the rotating speed of the motor runs freely, and the rotating speed of the motor is controlled to gradually rise to the target rotating speed. The larger the difference value of the rotating speeds is, the larger the difference between the current rotating speed of the motor and the target rotating speed is, when the final target rotating speed is reached, the power and the current of the motor can be increased greatly, and the temperature can be increased greatly, namely: at the moment, the temperature of the motor is far lower than that of the motor at the target rotating speed; and at the moment, the temperature reaches the critical temperature, so a cooling device needs to be started in front, the risk that the temperature of the motor exceeds the standard when the rotating speed of the motor reaches the target rotating speed is reduced, and the running reliability of the motor is ensured. The range of the T3 is 70-79 ℃, and the preferred value is 75 ℃; the range of N1 is 30-100 r/min, preferably 50 r/min.
Table-motor temperature, rotation speed difference and cooling device control relation table
Figure BDA0003632115870000111
Step 4, if the motor temperature T now If the rotating speed is less than T1, the rotating speed of the motor runs freely without starting the cooling device, and the rotating speed of the motor is controlled to gradually rise to the target rotating speed.
Corresponding to the motor temperature control method provided in the foregoing embodiment, an embodiment of the present invention provides a motor temperature control apparatus, which may be applied to a motor controller, and referring to a schematic structural diagram of the motor temperature control apparatus shown in fig. 4, the apparatus includes the following modules:
the monitoring module 41 is used for monitoring the motor temperature of the motor after the motor is started to operate; wherein, the periphery of the motor is provided with a cooling device.
And the first control module 42 is used for controlling the cooling device to be started when the temperature of the motor is greater than or equal to a first preset temperature.
And the second control module 43 is used for periodically calculating the temperature change value of the motor temperature and controlling the rotating speed of the motor based on the temperature change value.
The above-mentioned motor temperature control device that this embodiment provided, through cover the heat sink on the motor, and open the heat sink when monitoring motor temperature higher and cool down for the motor, ensure that motor temperature is in reasonable within range, avoid motor temperature too high and damage, through when opening the heat sink, according to the temperature variation value control motor rotational speed of the motor that periodic calculation obtained, it is low to avoid motor rotational speed, make the motor can exert the biggest efficiency when guaranteeing that the temperature can not be too high, avoid setting up the lower cost waste that leads to because of the rotational speed limit value, the production complexity and the development complexity of motor have been reduced simultaneously, the reliability of motor temperature control has been promoted.
In an embodiment, the second control module 43 is further configured to calculate a difference between a motor temperature in a current period and a motor temperature in a previous period, so as to obtain a temperature variation value; and when the temperature change value is less than or equal to a second preset temperature, controlling the rotating speed of the motor to rise at a preset change rate until the target rotating speed set by a user is reached.
In an embodiment, the second control module 43 is further configured to control the motor to maintain the current rotation speed when the temperature variation value is greater than a second preset temperature, and send a warning that the temperature of the motor is abnormal if a duration that the temperature variation value is greater than the second preset temperature reaches a preset duration.
In one embodiment, the above apparatus further comprises:
the third control module is used for detecting the current rotating speed of the motor and calculating the rotating speed difference value between the target rotating speed set by the user and the current rotating speed when the temperature of the motor is greater than or equal to a third preset temperature and less than the first preset temperature; and controlling the rotating speed of the motor and the opening and closing state of the cooling device according to the rotating speed difference.
In an embodiment, the third control module is further configured to control the cooling device to be in a closed state when the rotation speed difference is less than or equal to the first rotation speed, and control the motor to operate based on a target rotation speed set by a user; and when the rotating speed difference value is greater than the first rotating speed, the cooling device is controlled to be started, and the motor is controlled to operate based on the target rotating speed set by the user.
In one embodiment, the above apparatus further comprises:
and the fourth control module is used for controlling the cooling device to be in a closed state when the temperature of the motor is lower than a third preset temperature, and controlling the motor to operate based on the target rotating speed set by the user.
In one embodiment, the cooling device is a semiconductor cooling plate or a cooling medium heat dissipation pipe, and covers all or part of the surface of the motor in a surrounding manner.
The above-mentioned motor temperature control device that this embodiment provided, through monitoring motor temperature, and locate interval control heat sink and motor speed according to motor temperature, avoid considering inadequately because of the motor scene, the parameter sets up unreasonable or the device is ageing etc. and causes fan temperature rise out of control and damage, through initiatively cooling the motor when there is high temperature risk in the motor, furthest performance motor efficiency, avoid causing the cost extravagant because of the motor speed limit value is lower, but the motor operation wind speed scope is wider simultaneously, the adaptation scope is wider, production complexity and development work load have been reduced.
Corresponding to the motor temperature control method provided by the above embodiment, the embodiment provides an air conditioner, which includes a motor, a cooling device, and a motor controller, where the motor controller stores a computer readable storage medium of a computer program and a processor, and when the computer program is read and executed by the processor, the motor temperature control method provided by the above embodiment is implemented.
The motor in the air conditioner can be a motor with adjustable rotating speed arranged in the fan, as shown in figure 2, a temperature sensor is arranged on the motor and used for detecting the temperature of the motor, a cooling device covers the periphery of the motor, and whether the cooling device is started or not is judged synchronously according to the difference value between the rotating speed of the motor and the target rotating speed by detecting the temperature of the motor based on the temperature sensor, so that the temperature of the motor is kept in a reasonable range. The limit of the temperature to the maximum wind speed of the motor is reduced to the maximum extent, the cost is reduced, the universality of the motor is enhanced, and the related development workload of the motor in the air conditioner fan is reduced.
The present embodiment further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the processes of the foregoing embodiment of the motor temperature control method, and can achieve the same technical effects, and in order to avoid repetition, the details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
Of course, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments may be implemented by instructing the control device to perform operations through a computer, and the programs may be stored in a computer-readable storage medium, and when executed, the programs may include the processes of the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, 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 process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The motor temperature control device and the air conditioner disclosed by the embodiment correspond to the motor temperature control method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A method of controlling temperature of a motor, comprising:
monitoring the motor temperature of the motor after the motor is started to operate; wherein, a cooling device is covered on the motor;
when the temperature of the motor is greater than or equal to a first preset temperature, controlling the cooling device to be started;
and periodically calculating a temperature change value of the motor temperature, and controlling the rotating speed of the motor based on the temperature change value.
2. The motor temperature control method according to claim 1, wherein the step of periodically calculating a temperature variation value of the motor temperature, and controlling the rotation speed of the motor based on the temperature variation value, comprises:
calculating the difference value between the motor temperature in the current period and the motor temperature in the previous period to obtain the temperature change value;
and when the temperature change value is less than or equal to a second preset temperature, controlling the rotating speed of the motor to rise at a preset change rate until the target rotating speed set by a user is reached.
3. The motor temperature control method of claim 2, further comprising:
and when the temperature change value is greater than the second preset temperature, controlling the motor to maintain the current rotating speed to operate, and if the duration of the temperature change value greater than the second preset temperature reaches the preset duration, sending a motor temperature abnormity prompt.
4. The motor temperature control method of claim 1, further comprising:
when the temperature of the motor is greater than or equal to a third preset temperature and less than the first preset temperature, detecting the current rotating speed of the motor, and calculating a rotating speed difference value between a target rotating speed set by a user and the current rotating speed;
and controlling the rotating speed of the motor and the opening and closing state of the cooling device according to the rotating speed difference.
5. The method according to claim 4, wherein the step of controlling the rotation speed of the motor and the open/close state of the temperature reducing device according to the rotation speed difference comprises:
when the rotating speed difference value is smaller than or equal to a first rotating speed, controlling the cooling device to be in a closed state, and controlling the motor to operate based on a target rotating speed set by a user;
and when the rotating speed difference value is greater than the first rotating speed, controlling the cooling device to be started, and controlling the motor to operate based on a target rotating speed set by a user.
6. The motor temperature control method of claim 4, further comprising:
and when the temperature of the motor is lower than the third preset temperature, controlling the cooling device to be in a closed state, and controlling the motor to operate based on a target rotating speed set by a user.
7. The motor temperature control method according to any one of claims 1 to 6, wherein the cooling device is a semiconductor cooling plate or a refrigerant heat dissipation pipe and covers all or part of the surface of the motor in a surrounding manner.
8. A temperature control apparatus for a motor, comprising:
the monitoring module is used for monitoring the motor temperature of the motor after the motor is started to operate; wherein, a cooling device is arranged at the periphery of the motor;
the first control module is used for controlling the cooling device to be started when the temperature of the motor is greater than or equal to a first preset temperature;
and the second control module is used for periodically calculating the temperature change value of the motor temperature and controlling the rotating speed of the motor based on the temperature change value.
9. An air conditioner comprising a motor, a cooling device, and a motor controller, the motor controller comprising a computer readable storage medium storing a computer program and a processor, the computer program being read by the processor and when executed, performing the method of any one of claims 1-7.
10. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method according to any one of claims 1-7.
CN202210492338.8A 2022-05-07 2022-05-07 Motor temperature control method and device and air conditioner Active CN115076888B (en)

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