CN110985391B - A kind of dynamic driving torque measuring device and measuring method of electric scroll compressor - Google Patents

A kind of dynamic driving torque measuring device and measuring method of electric scroll compressor Download PDF

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CN110985391B
CN110985391B CN201911097520.8A CN201911097520A CN110985391B CN 110985391 B CN110985391 B CN 110985391B CN 201911097520 A CN201911097520 A CN 201911097520A CN 110985391 B CN110985391 B CN 110985391B
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scroll compressor
rotor
stator
motor
speed
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CN110985391A (en
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刘忠民
李�昊
陆文舒
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Hangzhou Dianzi University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/02—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

本发明提供了一种车用空调电动涡旋压缩机动态负载力矩测量装置及测量方法，涉及车用空调电动涡旋压缩机领域。该装置包括电流传感器和电源控制器，所述电流传感器测量电动涡旋压缩机定子线圈电流，所述电源控制器采集电流传感器信号，计算定子与转子之间感生电动势。当规定转子相位所对应的感生电动势超过限值时，判断电动涡旋压缩机负载力矩存在异常，降低定子驱动电压与频率，保护电动涡旋压缩机。该测量装置及矩测量方法可以评价涡旋压缩机动态工作状况，避免车用电动空调压缩机寒区工作发生“液击”故障。

Figure 201911097520

The invention provides a dynamic load torque measuring device and a measuring method of an electric scroll compressor for an air conditioner for a vehicle, and relates to the field of an electric scroll compressor for an air conditioner for a vehicle. The device includes a current sensor and a power supply controller, the current sensor measures the stator coil current of the electric scroll compressor, and the power supply controller collects the current sensor signal to calculate the electromotive force induced between the stator and the rotor. When the induced electromotive force corresponding to the specified rotor phase exceeds the limit value, it is judged that the load torque of the electric scroll compressor is abnormal, the stator driving voltage and frequency are reduced, and the electric scroll compressor is protected. The measuring device and the moment measuring method can evaluate the dynamic working condition of the scroll compressor, and avoid the "liquid shock" failure in the cold area of the vehicle electric air-conditioning compressor.

Figure 201911097520

Description

Dynamic driving torque measuring device and method for electric scroll compressor
Technical Field
The invention relates to the technical field of vehicle air conditioner electric scroll compressors, in particular to a device and a method for measuring dynamic driving torque of a vehicle air conditioner electric scroll compressor.
Background
The scroll compressor for vehicle air conditioner is a compressor with compressible volume composed of a fixed involute scroll and an involute scroll which is in eccentric rotary translation. During the working process of air suction, compression and exhaust, the fixed disc is fixed on the frame, and the movable disc is driven by the eccentric shaft and restricted by the anti-rotation mechanism to rotate around the center of the base circle of the fixed disc in a plane with a small radius. The air is sucked into the periphery of the fixed disc through the air filter element, and along with the rotation of the eccentric shaft, the air is gradually compressed in a plurality of crescent compression cavities formed by fitting the movable fixed disc and then is continuously discharged from the axial hole of the central part of the fixed disc. In cold winter or in perennial low-temperature areas such as the north, the traditional vehicle air conditioner needs to be preheated at a low rotating speed for three to five minutes in the starting process. This is because under the low temperature state, there may be liquid refrigerant in the compression chamber, under the high-speed rotation of scroll compressor, because the incompressible of refrigerant, the pressure in the compression chamber can be very big, this makes the scroll compressor be in very abominable operating condition, seriously influences the life of compressor spare part. The starting preheating time of the electric scroll compressor for the vehicle is long, and the comfort of a passenger compartment in the vehicle is influenced, so that a measuring method and a measuring device for judging the working state of the electric scroll compressor are required to be provided, and the starting preheating time of the electric scroll compressor is shortened.
The movable plate and the fixed plate of the scroll compressor are in a constantly-changing meshing state, and along with the gradual increase of the rotation angle of the motor rotor, the compression ratio of gas in the crescent cavity between the fixed plate and the movable plate is gradually increased, so that the driving moment of the eccentric shaft is gradually increased. In the final exhaust process of the compression cavity, the driving torque is suddenly reduced along with the sudden exhaust of the gas in the compression cavity, so that the driving torque of the compressor is in a state of quick change, and the rotating speed of the driving motor is also fluctuated violently along with the change of the driving torque.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a device and a method for measuring the dynamic driving torque of an electric scroll compressor of an air conditioner for a vehicle.
The technical scheme of the invention is as follows: the utility model provides a dynamic drive torque measuring device of vehicle air conditioner electric scroll compressor, includes scroll compressor, the scroll compressor power is provided by electrical source controller, be connected with current sensor between electrical source controller and the scroll compressor, current sensor's output is connected with the electrical source controller electricity, current sensor's input is connected with the scroll compressor electricity, electrical source controller and turbocompressor are connected with the driver electricity respectively.
The scroll compressor comprises a shell, a first bearing, a second bearing, an eccentric shaft, an eccentric part, a stator, a rotor, a movable disc, a fixed disc, an air inlet and an air outlet, wherein the first bearing and the second bearing are arranged in the shell, the eccentric shaft is inserted into the axle center of the first bearing and the axle center of the second bearing, the eccentric part is arranged in the middle of the eccentric shaft, the stator is fixedly arranged on the inner wall of the shell, the rotor is arranged at the position, corresponding to the stator, on the eccentric shaft, the movable disc is fixedly connected with the eccentric part at one end of the eccentric shaft, the fixed disc is arranged at the position, corresponding to the movable disc, of the inner wall of the shell, the fixed disc and the movable disc are fitted with each.
The stator is hollow and provided with a winding, and the rotor is fixedly provided with magnetic steel.
The stator is located between the first bearing and the second bearing.
The outer wall of casing is close to keeping away from driving disk one side of deciding the dish and is provided with the gas outlet, the outer wall of casing is close to keeping away from deciding the dish one side of dish and is provided with the air inlet of moving disk.
A measuring method based on a vehicle air conditioner electric scroll compressor dynamic load moment measuring device comprises the following steps:
1) starting the electric scroll compressor, and providing starting excitation voltage and frequency control for the stator by the power supply controller;
2) starting an excitation voltage and frequency which are far lower than a rated value, and aiming at driving an electric scroll compressor to enable an air-conditioning refrigerant to start circulating and checking whether liquid refrigerant is deposited in the compressor or not;
3) the power supply controller measures stator exciting current through a current sensor, and calculates stator induced electromotive force and magnetic flux corresponding to a specified rotor rotation angle phase through the following formula:
U＝KEΦn+IaRa；
wherein U is an excitation voltage; kEIs the structural coefficient of the motor; phi is the magnetic flux between the stator and the rotor; n is the actual rotating speed of the motor; i isaIs the stator exciting current; raWinding of the stator coil;
4) when liquid refrigerant enters the compression cavity of the scroll compressor, the load of the driving motor is rapidly increased, the actual rotating speed n of the motor is rapidly reduced, so that the magnetic flux phi corresponding to the stator coil reversing phase is obviously increased, and the exciting current IaSharply decreases;
5) the power supply controller measures the time difference delta t between two excitation current troughs through the current sensor, and can be calculated by the following formula:
Figure GDA0002809500430000031
Figure GDA0002809500430000032
wherein
Figure GDA0002809500430000033
The initial rotation speed of the rotor is the first period;
Figure GDA0002809500430000034
the end point rotating speed of the rotor in the first period is set;
Figure GDA0002809500430000035
the two excitation current wave troughs correspond to the rotor rotation angle phase difference; delta t is the time difference between two excitation current troughs;
Figure GDA0002809500430000036
the average driving torque of the rotor is obtained;
Figure GDA0002809500430000037
the average load moment borne by the rotor; i isRThe moment of inertia of the rotor and the rotor of the scroll compressor; kTIs the structural coefficient of the motor;
6) in the second cycle, there are
Figure GDA0002809500430000038
Remeasure Δ t and IaBy performing iterative calculations
Figure GDA0002809500430000039
7) Setting the rotation speed by the power supply controller
Figure GDA00028095004300000310
The initial value is obtained, iterative calculation can be gradually close to the actual rotating speed n of the motor through continuous measurement for multiple times, and when the difference delta n between the actual rotating speed n of the motor and the set rotating speed exceeds the limit value, the situation that the load moment of the scroll compressor is abnormal can be considered, and the rotating speed of the motor is reduced for working; when a plurality of continuous delta n cycles meet the requirement of the limit value, the scroll compressor is considered to work normally, and the rotating speed can be increased to the rated value.
The invention has the following beneficial effects: the problem that the conventional torque measuring method of the scroll compressor cannot reflect the relation that the load torque continuously changes along with the change of the compression process is solved, the dynamic working condition of the scroll compressor is evaluated, and the preparation time is shortened for starting the vehicle air conditioner. The problem of current vehicle air conditioner start-up preheating time long is solved.
Drawings
Fig. 1 is a schematic structural diagram of a dynamic load moment measuring device of an electric scroll compressor of a vehicle air conditioner.
Fig. 2 is a structural axial sectional view of the electric scroll compressor of the air conditioner for a vehicle according to the present invention.
Fig. 3 is a radial sectional view showing the structure of the electric scroll compressor for vehicle air conditioner according to the present invention.
Fig. 4 is a graph of supply voltage, induced voltage and current over time in accordance with the present invention.
In the figure: 100-scroll compressor, 101-power controller, 102-current sensor, 103-driver, 1-casing, 2-first bearing, 3-eccentric shaft, 4-rotor, 5-stator, 6-winding, 7-second bearing, 8-magnetic steel, 9-eccentric part, 10-movable disk, 11-fixed disk, 12-air outlet and 13-air inlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
As shown in FIG. 1, the invention provides a dynamic load torque measuring device for an electric scroll compressor of an air conditioner for a vehicle, which comprises a scroll compressor 100, wherein the power supply of the scroll compressor 100 is provided by a power supply controller 101, a current sensor 102 is connected between the power supply controller 101 and the scroll compressor 100, the output end of the current sensor 102 is connected to the power supply controller 101 through a circuit, the input end of the current sensor 102 is electrically connected with the scroll compressor 100, and the power supply controller 101 and the scroll compressor 100 are respectively and electrically connected with a driver 104.
As shown in fig. 2 and 3, the scroll compressor 100 includes a casing 1, a first bearing 2, a second bearing 7, an eccentric shaft 3, an eccentric portion 9, a rotor 4, a stator 5, a winding 6, a magnetic steel 8, a movable disk 10, a fixed disk 11, an air inlet 13 and an air outlet 12, the casing 1 is internally provided with the first bearing 2 and the second bearing 7, the eccentric shaft 3 is inserted into the first bearing 2 and the second bearing 7, the eccentric portion 9 is arranged in the middle of the eccentric shaft 3, the eccentric shaft 3 penetrates through the second bearing 7 and extends forwards inside the casing 1 and rotates around the first bearing 2 and the second bearing 7, the outer wall of the eccentric shaft 3 is positioned between the first bearing 2 and the second bearing 7 and is fixedly provided with the rotor 4, the inner wall of the casing 1 is fixedly provided with the stator 5 corresponding to the rotor 4, and the stator 5 is positioned between the first bearing 2 and the second. Stator 5 inside cavity just is provided with winding 6, 4 inside fixed magnet steels 8 that are provided with of rotor, eccentric shaft 3 is located the one end fixed mounting that first bearing 2 was kept away from to second bearing 7 has driving disk 10, the inner wall of casing 1 is provided with the price fixing 11 that corresponds with driving disk 10, driving disk 10 and 11 interfitting of price fixing and eccentric settings, the driving disk 10 one side of keeping away from that the outer wall of casing 1 is close to price fixing 11 is provided with gas outlet 12, the outer wall of casing 1 is close to that the price fixing 11 one side of keeping away from of driving disk 10 and is provided with air inlet 13.
A measuring method based on a vehicle air conditioner electric scroll compressor dynamic load moment measuring device comprises the following steps:
1) the electric scroll compressor is started and the power controller 101 provides a starting excitation voltage and frequency control to the stator 5.
2) The starting excitation voltage and the frequency are far lower than the rated value, and the purpose is to drive the electric scroll compressor to enable the air-conditioning refrigerant to start circulating, check whether the liquid refrigerant is deposited in the compressor or not, and avoid the damage of the compressor caused by the liquid refrigerant entering a compression cavity.
3) The power controller 101 measures a stator exciting current by the current sensor 102, and obtains a stator induced electromotive force and a magnetic flux corresponding to a specified rotor rotational angle phase by calculation through the following formula.
U＝KEΦn+IaRaFormula 1;
u is excitation voltage; kEIs the structural coefficient of the motor; phi is the magnetic flux between the stator and the rotor; n is the actual rotating speed of the motor; i isaIs the stator exciting current; raIs a stator coil winding.
4) When liquid refrigerant enters the compression cavity of the scroll compressor, the load of the driving motor is rapidly increased, the actual rotating speed n of the motor is rapidly reduced, so that the magnetic flux phi corresponding to the stator coil reversing phase is obviously increased, and the exciting current IaAnd sharply decreases.
5) The power controller 101 measures the time difference Δ t between two excitation current troughs through the current sensor 102, which can be calculated by the following formula:
Figure GDA0002809500430000051
Figure GDA0002809500430000052
Figure GDA0002809500430000053
the initial rotation speed of the rotor is the first period;
Figure GDA0002809500430000054
the end point rotating speed of the rotor in the first period is set;
Figure GDA0002809500430000055
the two excitation current wave troughs correspond to the rotor rotation angle phase difference; delta t is the time difference between two excitation current troughs;
Figure GDA0002809500430000056
the average driving torque of the rotor is obtained;
Figure GDA0002809500430000057
the average load moment borne by the rotor; i isRThe moment of inertia of the rotor and the rotor of the scroll compressor; kTIs the structural coefficient of the motor.
6) In the second cycle, there are
Figure GDA0002809500430000058
Remeasure Δ t and IaBy performing iterative calculations
Figure GDA0002809500430000059
7) Setting the rotation speed by the power supply controller
Figure GDA00028095004300000510
The initial value is obtained, iterative calculation can be gradually close to the actual rotating speed n of the motor through continuous measurement for multiple times, and when the difference delta n between the actual rotating speed n of the motor and the set rotating speed exceeds the limit value, the situation that the load moment of the scroll compressor is abnormal can be considered, and the rotating speed of the motor is reduced for working; when the delta n continuously meets the requirement of the limit value for a plurality of cycles, the scroll compressor is considered to work normally, and the rotating speed can be increased to the rated value.
When the induced electromotive force corresponding to the specified rotor phase exceeds the limit value, the load moment of the electric scroll compressor is judged to be abnormal, the driving voltage and frequency of the stator are reduced, and the electric scroll compressor is protected. The measuring device and the moment measuring method can evaluate the dynamic working condition of the scroll compressor, avoid the liquid impact fault in the cold region work of the vehicle electric air conditioner compressor, and shorten the preparation time for starting the vehicle air conditioner.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (1)

1.一种基于电动涡旋压缩机动态负载力矩测量装置的测量方法，其特征在于：包括如下步骤：1. a measuring method based on an electric scroll compressor dynamic load torque measuring device, is characterized in that: comprise the steps: 1)电动涡旋压缩机启动，电源控制器(101)为定子(5)提供启动励磁电压和频率控制；1) The electric scroll compressor is started, and the power controller (101) provides the stator (5) with starting excitation voltage and frequency control; 2)启动励磁电压与频率远低于额定值，目的在于驱动电动涡旋压缩机使空调制冷剂开始循环，检查压缩机内是否有液态制冷剂沉积；2) The starting excitation voltage and frequency are much lower than the rated value, the purpose is to drive the electric scroll compressor to make the air conditioner refrigerant start to circulate, and check whether there is liquid refrigerant deposition in the compressor; 3)电源控制器(101)通过电流传感器(102)测量定子励磁电流，通过以下公式计算规定转子转角相位所对应的定子感生电动势和磁通量：3) The power supply controller (101) measures the stator excitation current through the current sensor (102), and calculates the stator-induced electromotive force and magnetic flux corresponding to the specified rotor angle phase by the following formula: U＝KEΦn+IaRa；U=K E Φn+I a R a ; 其中U为励磁电压；KE为电机结构系数；Φ为定子与转子之间磁通量；n为电机实际转速；Ia为定子励磁电流；Ra为定子线圈绕阻；Wherein U is the excitation voltage; K E is the motor structure coefficient; Φ is the magnetic flux between the stator and the rotor; n is the actual speed of the motor; I a is the stator excitation current; R a is the stator coil winding resistance; 4)当液体制冷剂进入涡旋压缩机压缩腔内时，驱动电机负载急剧上升，电机实际转速n迅速下降，使得定子线圈换向相位所对应磁通量Φ显著升高，励磁电流Ia急剧降低；4) When the liquid refrigerant enters the compression chamber of the scroll compressor, the load of the drive motor increases sharply, and the actual speed n of the motor decreases rapidly, so that the magnetic flux Φ corresponding to the commutation phase of the stator coil increases significantly, and the excitation current I a decreases sharply; 5)电源控制器(101)通过电流传感器(102)测量两次励磁电流波谷之间的时间差Δt，可以通过下列公式计算得到：5) The power controller (101) measures the time difference Δt between two excitation current valleys through the current sensor (102), which can be calculated by the following formula:
Figure FDA0002809500420000011
Figure FDA0002809500420000011
Figure FDA0002809500420000012
Figure FDA0002809500420000012
 其中
Figure FDA0002809500420000013
为第一个周期转子初始转速；
Figure FDA0002809500420000014
为第一个周期转子终点转速；in
Figure FDA0002809500420000013
is the initial rotor speed in the first cycle;
Figure FDA0002809500420000014
is the rotor end speed of the first cycle;
Figure FDA0002809500420000015
为两次励磁电流波谷对应转子转角相位差；Δt为两次励磁电流波谷之间的时间差；
Figure FDA0002809500420000015
is the phase difference of the rotor angle corresponding to the two excitation current valleys; Δt is the time difference between the two excitation current valleys;
Figure FDA0002809500420000016
为转子所受平均驱动力矩；
Figure FDA0002809500420000017
为转子所受平均负载力矩；IR为转子与涡旋压缩机转子的转动惯量；KT为电机结构系数；
Figure FDA0002809500420000016
is the average driving torque of the rotor;
Figure FDA0002809500420000017
is the average load torque of the rotor; IR is the moment of inertia of the rotor and the scroll compressor rotor; K T is the motor structure coefficient; 6)在第二个周期，有
Figure FDA0002809500420000018
重新测量Δt和Ia，实现迭代计算得到
Figure FDA0002809500420000019
6) In the second cycle, there is
Figure FDA0002809500420000018
Re-measure Δt and I a to achieve iterative calculation to get
Figure FDA0002809500420000019
 7)以电源控制器设定转速
Figure FDA00028095004200000110
为初始值，通过连续多次测量，迭代计算可以逐渐接近电机实际转速n，当电机实际转速n与设定转速差Δn超过限值时，可以认为涡旋压缩机出现负载力矩异常，电机降低转速工作；当Δn连续多个循环满足限值要求时，则认为涡旋压缩机工作正常，可以提高转速至额定值。7) Set the speed with the power controller
Figure FDA00028095004200000110
It is the initial value. Through continuous multiple measurements, the iterative calculation can gradually approach the actual speed n of the motor. When the difference between the actual speed n of the motor and the set speed Δn exceeds the limit, it can be considered that the scroll compressor has abnormal load torque, and the motor reduces the speed. Work; when Δn meets the limit requirement for several consecutive cycles, it is considered that the scroll compressor is working normally, and the speed can be increased to the rated value.
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