WO2016011617A1

WO2016011617A1 - Filter screen clogging detection method for air supply device and air supply device using same

Info

Publication number: WO2016011617A1
Application number: PCT/CN2014/082813
Authority: WO
Inventors: 王继忠; 赵勇; 张先胜; 孙海荣; 周一桥; 张政
Original assignee: 中山大洋电机股份有限公司
Priority date: 2014-07-23
Filing date: 2014-07-23
Publication date: 2016-01-28

Abstract

A filter screen clogging detection method for an air supply device and an air supply device using same; the air supply device comprises an air intake port (104), an air exhaust port (105), an air duct, a fan or a wind rotor (102), a fan motor (101) and an air filter screen (103); the air filter screen is installed on the air duct; the fan motor drives the fan or the wind rotor to rotate, causing air to enter the air duct through the air intake port and pass through the air filter screen, and exit from the air exhaust port; the fan motor is used as an element testing an air volume, and upon detecting that the deviation between the air volume and a preset air volume has reached a fixed value, determines that the air filter screen is clogged and outputs a signal alarm. The detection method and air supply device do not require any additional hardware, are easy to install and are low in cost.

Description

Filter clogging detection method for air supply device and air supply device thereof

Technical field:

The invention relates to a filter clogging detecting method of a blowing device and a blowing device thereof.

Background technique :

In recent years, with the increasingly fierce competition in the electrical field, the technical requirements for products have been continuously improved, such as requiring energy conservation and environmental protection, high degree of controllability, short development cycle, and low noise. As the core component - the motor, it is undoubtedly the key component to solve the above technical problems. The motor in the traditional domestic air conditioner generally adopts single-phase AC motor PSC, single-phase AC motor, low efficiency, relatively energy consumption, loud noise, controllable The level of sexual intelligence is low. With the development of motor technology, DC motors have gradually replaced AC motors. DC motors have motor controllers, which use motor controllers to achieve the purpose of electronic commutation of currents. Therefore, there are also some people in the industry called ECM (electronically commutated motor) or Brushless DC motor (BLDC MOTOR), which has the characteristics of high energy saving, high reliability and controllability, low noise, easy to realize intelligence, etc., can solve the shortage of single-phase AC motor, therefore, the existing air conditioner inside The single-phase AC motor is gradually replaced by a DC brushless motor or an ECM motor.

Air conditioners in China or other Asian countries. The DC motor control board is connected to the air conditioner main board. There are 5 connection signals, which are: GND port, VDC port, VCC port, VSP port, FG port. The interface of the air-conditioning main board inputs the target speed to the DC motor control board through the output VSP voltage port, and the motor feeds back the actual speed of the motor through the FG port to realize the closed-loop control of the speed of the DC motor. When the air inlet and outlet air filter or air duct is blocked, the air outlet of the air conditioner will decrease, which will affect the air conditioning cooling or heating effect. This is not desirable for air conditioning systems. For this reason, it is necessary to implement a constant air volume or air volume monitoring/alarm function on a conventional BLDC motor.

Existing solutions: Some air pressure gauges are installed in the air outlets or air ducts to judge the air volume. Some install air flow meters to measure the air volume. However, this requires additional hardware, installation wiring troubles, and additional extras. cost.

Summary of the invention:

The object of the present invention is to provide a filter clogging detecting method for a blowing device and a blowing device thereof The fan motor is used as the component for detecting the air volume. When the detected air volume is lower than the set air volume, it is judged that the air filter is clogged and the signal alarm is output, without adding any hardware, the installation is simple, and the cost is low.

The object of the present invention is achieved by the following technical solutions.

A filter clogging detecting method for a blowing device, wherein the air blowing device comprises an air inlet, an air outlet, a duct, a fan or a wind wheel, a fan motor and an air filter, the air filter is installed on the air duct, and the fan motor The fan or the wind wheel is rotated to allow air to enter the air duct from the air inlet and pass through the air filter, and then output from the air outlet. The utility model is characterized in that: the fan motor is used as the component for detecting the air volume, and when the detected air volume is lower than the set air volume, the air is judged. Blocks the air filter and outputs a signal alarm.

The air supply device is a split air conditioner, or a cabinet air conditioner, or a window air conditioner, or a multi-connected air conditioner, or a duct air conditioner, or a commercial coiler air conditioner, or a patio air conditioner. , or HVAC system, or air freshener, or air purifier.

The fan motor adopts a BLDC motor or an ECM motor, and includes a motor unit and a motor controller. The motor unit includes a rotating shaft, a permanent magnet rotor assembly, a stator assembly and a casing assembly, a permanent magnet rotor assembly and a stator assembly. Forming a magnetic coupling, the stator assembly includes a stator core and a coil winding wound on the stator core, the motor controller including a microprocessor, an inverter circuit, and an operating parameter detecting circuit, and an output end of the inverter circuit The coil winding is connected, the operating parameter detecting circuit inputs the detected signal to the microprocessor, the output end of the microprocessor controls the inverter circuit, the microprocessor sets the function of the air volume calculation, and the measured air volume calculated by the air volume function and the real-time operation of the motor Related to parameters.

The function of the air volume calculation described above is Q=F(P0WER,n), where POWER is the input power of the motor and n is the speed of the motor.

The fan motor described above operates in a constant air volume control mode, and the microprocessor first measures whether the actual power reaches the rated power. If the measured actual power reaches the rated power, and the deviation between the detected air volume and the set air volume reaches a certain value, Alarm; When it is detected that the air volume deviates from the set air volume within the allowable range, choose not to alarm.

The fan motor described above operates in a constant torque control mode. When the deviation between the detected air volume and the set air volume reaches a certain value, it is determined that the air filter is clogged and an alarm is issued. The fan motor described above operates in the constant speed control mode. When the deviation between the detected air volume and the set air volume reaches a certain value, it is determined that the air filter is clogged and alarmed.

The utility model relates to a air supply device, which comprises a body, a air duct is arranged in the machine body, a fan motor, a wind wheel and an air filter net are installed in the air body, an air inlet and an air outlet are arranged in the air duct, and an air filter net and a wind wheel are installed in the air duct. The fan motor drives the wind wheel to rotate. The fan motor uses a BLDC motor or an ECM motor, and includes a motor unit and a motor controller. The motor unit includes a rotating shaft, a permanent magnet rotor assembly, a stator assembly and a casing assembly. The permanent magnet rotor assembly and the stator assembly form a magnetic coupling, the stator assembly includes a stator core and a coil winding wound on the stator core, and the motor controller includes a microprocessor, an inverter circuit, and an operating parameter detecting circuit. The output end of the inverter circuit is connected to the coil winding, the operating parameter detecting circuit inputs the detected signal to the microprocessor, and the output end of the microprocessor controls the inverter circuit, wherein the fan motor inputs the set air volume, and the fan motor acts as The component that detects the air volume determines that the air filter is clogged when the detected air volume is lower than the set air volume.

The air supply device described above is a split air conditioner, or a cabinet air conditioner, or a window air conditioner, or a multi-connected air conditioner, or a duct air conditioner, or a commercial coiler air conditioner, or a patio machine. Air conditioning, or HVAC system, or air freshener, or air purifier.

When the detected air volume is lower than the factory setting value, it is determined that the air filter is clogged.

The air blowing device described above is provided with a device controller, and the device controller inputs a set air volume to the fan motor, and the microprocessor detects the air volume in real time. When the deviation between the detected air volume and the set air volume reaches a certain value, the microprocessor controls The alarm circuit alarms, indicating that the air filter is clogged.

The alarm circuit described above may be an audible alarm circuit or a photoelectric alarm circuit.

The alarm circuit described above can be placed in the device controller or in the motor controller.

The alarm circuit described above may include an original liquid crystal display of the air supply device, the microprocessor first transmits an alarm signal to the device controller, and the empty device controller outputs a signal to the liquid crystal display, and uses a text or a pattern to prompt the air filter to be clogged. .

The fan motor described above operates in a constant air volume control mode, and detects the deviation between the air volume and the set air volume. When a certain value is reached, an alarm is issued; when it is detected that the air volume deviates from the set air volume within the allowable range, the alarm is not selected.

The fan motor described above operates in the constant speed control mode. When the deviation between the detected air volume and the set air volume reaches a certain value, it is determined that the air filter is clogged and alarmed.

The fan motor described above operates in the constant torque control mode. When the deviation between the detected air volume and the set air volume reaches a certain value, it is determined that the air filter is clogged and an alarm is issued.

Compared with the prior art, the invention has the following effects:

1) Using the fan motor as the component for detecting the air volume, when the deviation between the detected air volume and the set air volume reaches a certain value, it is judged that the air filter is clogged and outputs a signal alarm, without adding any hardware, the installation is simple and the cost is low;

2) The fan motor works in the control mode of constant air volume. The microprocessor first measures whether the actual power reaches the rated power. If the measured actual power reaches the rated power, then the deviation between the detected air volume and the set air volume is judged. The scheme is simple, the microprocessor operation Small amount, high feasibility;

3) The alarm circuit is arranged in the motor controller, and it is not necessary to change the circuit structure of the total control circuit board of the air conditioning system, which is more convenient and simple;

4) The alarm circuit may include a liquid crystal display of the air supply device, and the microprocessor first transmits an alarm signal to the device controller of the air supply device, and the device controller outputs a signal to the liquid crystal display, prompting the air filter to block using text or a pattern. Make full use of existing resources and air-conditioning system friendly interface to alarm and save costs.

BRIEF DESCRIPTION OF THE DRAWINGS:

1 is a schematic structural view of a conventional air conditioning fan system;

Figure 2 is a schematic view showing the installation of the fan motor of the present invention;

Figure 3 is a perspective view of the fan motor of the present invention;

Figure 4 is a perspective view of the motor controller of the fan motor of the present invention;

Figure 5 is a cross-sectional view of the fan motor of the present invention;

Figure 6 is a block diagram showing an implementation circuit of a motor controller of the fan motor of the present invention; Figure 7 is a circuit diagram corresponding to Figure 6;

8 is a control flow chart of a constant air volume control method of the fan motor of the present invention;

9 is a fitting curve of a family of constant winds obtained by experimentally testing the fan motor of the present invention;

Figure 10 is a graph showing the experimental data fitting of the direct power control constant air volume of the fan motor of the present invention;

Figure U is a fitting curve of the experimental data of the fan motor of the present invention using an interpolation method to solve an arbitrary input air volume;

Figure 12 is a control logic diagram of a constant air volume control method of the fan motor of the present invention;

Figure 13 is a schematic diagram of a control process of the constant air volume control method of the fan motor of the present invention; Figure 14 is a schematic diagram of another control process of the constant air volume control method of the fan motor of the present invention; Figure 15 is a constant air volume control of the fan motor of the present invention; The experimentally verified test result chart of the method; FIG. 16 is a schematic diagram of the wind volume measurement of the fan motor of the present invention;

Figure 17 is a schematic view showing the structure of an air cleaner of the present invention.

detailed description:

The present invention will be described in detail below with reference to the embodiments and drawings.

Embodiment 1:

The air supply device is a split air conditioner, or a cabinet air conditioner, or a window air conditioner, or a multi-connected air conditioner, or a duct air conditioner, or a commercial coiler air conditioner, or a patio air conditioner. , or HVAC system, or air freshener, or air purifier. The fan motor adopts a BLDC motor or an ECM motor, and includes a motor unit and a motor controller. The motor unit includes a rotating shaft, a permanent magnet rotor assembly, a stator assembly and a casing assembly, and the permanent magnet rotor assembly and the stator assembly are formed. The magnetic coupling, the stator assembly includes a stator core and a coil winding wound on the stator core, the motor controller includes a microprocessor, an inverter circuit and an operating parameter detecting circuit, and an output end and a coil of the inverter circuit The winding connection, the operating parameter detecting circuit inputs the detected signal to the microprocessor, the output end of the microprocessor controls the inverter circuit, the microprocessor sets the function of the air volume calculation, the measured air volume calculated by the air volume function and the real-time running parameter of the motor related. The operating parameter detecting circuit includes a rotor position detecting circuit, a phase current detecting circuit, a bus current detecting circuit, a bus voltage detecting circuit, and the like for detecting various operating states of the motor in real time. The function of the air volume calculation is Q=F( P0WER,n), where POWER is the input power of the motor and n is the speed of the motor. The fan motor can work in the constant air volume control mode. The microprocessor first measures whether the actual power reaches the rated power. If the measured actual power reaches the rated power, and the deviation between the detected air volume and the set air volume reaches a certain value, an alarm is issued; If the detected air volume is within the allowable range, the fan motor can work in the constant torque control mode. When the deviation between the detected air volume and the set air volume reaches a certain value, it is judged that the air filter is clogged. Call the police. The fan motor can work in the constant speed control mode. When the deviation between the detected air volume and the set air volume reaches a certain value, it is determined that the air filter is clogged and alarmed. The circuit structure of the fan motor and the measurement and control principle of the air volume used in the present invention are first described below:

The present invention is shown in Fig. 1. In a typical air conditioning ventilation duct (referred to as a duct), an air blowing system (such as a gas stove or an air handler) is installed, and the figure is replaced by "motor + wind wheel". There is also an air filter in the pipeline. When the motor starts, the air blows. Since the number of air outlets and air inlets is related to the number of rooms, there is no uniform standard for the design of the pipeline, and the air filter may have different pressure drops. The blast system with a conventional single-phase AC motor-PSC motor is used in different pipes, and the actual air volume will be different. The fan motor used in the invention is a BLDC motor or an ECM motor.

As shown in Figure 2, 1) The control of the product is an air conditioning system controller that controls all product operating devices and sends peripheral circuit and protocol setting information through a customized interface to the motor controller. 2) The motor controller includes a microprocessor, a single-chip microcomputer or a DSP electronic board for motor control. It has a power supply part to supply power to each part of the controller circuit, and the power supply is to set a DC mother. Line voltage and current. Therefore, the control of the motor will perform power transfer. Low-cost and mass-produced motor controllers typically use shunt resistors as current and voltage sensing hardware, as system feedback to control motor drive to perform motor control, such as vector control, direct torque control, and other types of sensors or none. Sensor control. It is well known that any change in the operating period of an electronic component is the cause of the accuracy and durability of the test. 3) There is a magnet body and structure on the rotor of the fan motor, and there are multi-phase windings on the stator side or slot. When the temperature changes, the permanent magnet and winding resistance change, which may cause different changes in the motor control. The motor manufacturing process usually produces a certain degree of change, motor aging, new motors and old motors, contributing factors to control accuracy and durability, at the time of life, etc., the magnetic flux from the magnet's motor will change due to temperature , demagnetization, etc. In addition, the possible risks of motor shaft failure, system safety, and detection or real-time monitoring. 4) Blower: The blower is mounted on the motor shaft and the airflow generated by the rotation is at a certain speed. The location of the installation may affect operation, increase friction, low flow, and even incorrect direction of rotation. 5) Air filter: The air filter should be replaced and repaired regularly. But this may be lost tracking for a long time. This will increase the frictional influence on the airflow pressure. 6) Pipeline Control: The piping system may change the cause of pressure changes due to dust and pipe rupture, zone control and on/off wind port system. According to the above situation, if the constant air volume control will produce a lot of instability factors.

As shown in FIG. 3, FIG. 4 and FIG. 5, the fan motor is generally composed of a motor controller 2 and a motor unit 1, and the motor unit 1 includes a stator assembly 12, a rotor assembly 13 and a casing assembly 11, and the stator assembly 13 Mounted on the casing assembly 11, the motor unit 1 is mounted with a Hall sensor 14 for detecting the position of the rotor, the rotor assembly 13 is assembled inside or outside the stator assembly 12, and the motor controller 2 includes a control box 22 and is mounted on the control box. The control circuit board 21 inside 22, the control circuit board 21 generally includes a power supply circuit, a microprocessor, a bus current detecting circuit, an inverter circuit, and a rotor position measuring circuit 14 (ie, a Hall sensor), and the power circuit supplies power to each part of the circuit. The rotor position measuring circuit detects the rotor position signal and inputs it to the microprocessor. The bus current detecting circuit inputs the detected bus circuit to the microprocessor, and the bus voltage detecting circuit inputs the DC bus voltage to the microprocessor, and the microprocessor controls the inverse. The variable circuit controls the on and off of the coil windings of the respective phases of the stator assembly 12. As shown in Fig. 6 and Fig. 7, it is assumed that the fan motor is a 3-phase brushless DC permanent magnet synchronous motor, and the rotor position measuring circuit 14 generally adopts three Hall sensors, and three Hall sensors respectively detect a 360-degree electrical angle cycle. The rotor position changes the energization of each phase coil winding of the stator assembly 12 every 120 degrees of electrical angle to form a 3-phase 6-turn control mode. AC INPUT After the full-wave rectification circuit consisting of diodes D7, D8, D9, and D10, DC bus voltage Vbus is output at one end of capacitor C1. DC bus voltage Vbus is related to input AC voltage, AC input ( After the voltage of AC INPUT) is determined, the line voltage UP of the 3-phase winding is the PWM chopping output voltage, UP=Vbus*w, w is the duty ratio of the PWM signal input from the microprocessor to the inverter circuit, and the line voltage is changed. The DC bus current Ibus can be changed. The inverter circuit is composed of electronic switch tubes Ql, Q2, Q3, Q4, Q5 and Q6. The control terminals of the electronic switch tubes Ql, Q2, Q3, Q4, Q5 and Q6 are respectively output by the microprocessor. The 6-channel P-signal (Pl, P2, P3, P4, P5, P6) is controlled, the inverter circuit is also connected with a resistor R1 for detecting the bus current Ibus, and the bus current detecting circuit converts the detected bus current Ibus of the resistor R1 and transmits To the microprocessor. The motor input power control is controlled by the electronic switch tube Q7. The one-way P-signal output of the microprocessor, P0, controls the on-time of the electronic switch tube Q7 to control the motor input power.

As shown in FIG. 8, a constant air volume control method for direct power control of a fan motor in an air conditioning system, the fan motor driving a wind wheel and having a stator assembly, a permanent magnet rotor assembly, and a motor controller, wherein the motor controller includes Microprocessor, inverter circuit, rotor position measuring circuit, bus current detecting circuit, bus voltage detecting circuit and motor input power control circuit (not shown), rotor position measuring circuit detects rotor position signal and inputs to microprocessor The microprocessor calculates the real-time rotational speed n of the motor according to the rotor position signal, the bus current detecting circuit inputs the bus current to the microprocessor, and the bus voltage detecting circuit inputs the DC bus voltage to the microprocessor, and the microprocessor controls the inverter circuit. The inverter circuit controls the on/off of the coil windings of the stator components of the stator assembly, and the microprocessor controls the motor input power control circuit, which is characterized in that: the following steps are included:

Step A) Start the motor controller, receive or preset the target air volume value IN- CFM;

Step B) Obtain a corresponding function P= f (n) according to the target air volume value IN-CFM, where n is the rotational speed and P is the input power of the motor; Step c) Enter the direct power control constant air volume control mode: When the motor or motor speed is zero, the motor is started, so that it reaches a stable working point (A, A) along the control track of the function P= f(n) _; P„n _t is a pair of input power and rotational speed on a trajectory satisfying the constant air volume control function P=f(n);

Step D) Maintain direct power control Constant air volume control mode: Calculate the real-time input power of the motor according to the motor operating parameters Pi; i calculate Δρ=| corpse _ΑΊ;

歩 Ε) If the power increment value Δ Ρ is less than the set value P _set , the existing working point is maintained;

Step F) If the power increment value ΔΡ is greater than or equal to the set value, the power/speed control logic will calculate whether the operating time of the speed loop is reached; if the operating time of the speed loop is not reached, the existing working point is maintained;

Step G) If the operating time of the speed loop has been reached, enter the speed control loop and press

Adjust the speed, ni is the real-time speed, and realize the new working point (Pi, ni) on the trajectory, that is, let Pt=Pi, nt=ni, return to step C.

The above-mentioned function P=f(n) is obtained as follows: First, the original data is collected, and the target air volume is adjusted from low static pressure to high static pressure for a plurality of target air volumes, and the static pressure can cover the application. The actual static pressure range, in the process of adjusting the static pressure, let the motor be at constant speed control, and maintain the air volume as the target air volume by adjusting the motor speed n and the real-time input power of the motor Pi, and record the steady state speed n and corresponding of the motor at this time. The real-time input power Pi of the motor, so that for a number of target air volumes, a set of speed n and the real-time input power Pi of the motor are generated, and then a curve fitting method is used to generate a plurality of target air volumes, each of which corresponds to a function P. = f(n).

If the external input target air volume value IN-CFM is not equal to one of the above-mentioned measured target air volumes, the above calculation may be performed by interpolation, fitting calculation and any external input target air volume value.

The corresponding function of IN-CFM P = f(n). The constant air volume control of the arbitrary target air volume is realized.

What is the function relationship described above? = f (n) is a polynomial function:

Where cc ₂ ,..., ^ is the coefficient, n is the motor speed value, and each target air volume corresponds to a group

C ₁₅ C ₂ ,..., C _m coefficient is stored and the microprocessor obtains a corresponding set of CC ₂ ,..., C _m coefficients according to the input target air volume value IN-CFM by table lookup or interpolation method, thereby obtaining a functional relationship. Style? = f (n) o

The function relation P = f(n) is a second-order function:

.

The development of the Direct P Control for Constant Airflow Control Apparatus Method and the establishment of the mathematical model are as follows: Generally, in a ventilation system, the fan is driven by a fan motor in a stable manner. The state of the air produced by the air. A constant air volume control is achieved by speed and power control under a static pressure condition, see the following relationship: CFM = F( P, speed, pressure) , where CFM is the air volume, P is the power, speed, is the speed, Pressure is static pressure. When the static pressure changes, the constant air volume is maintained by the control of power and speed. As the static pressure increases, the power and speed change. A cluster of constant air volume CFM curves can be tested, as shown in Figure 9. Based on these constant air volume CFM curves, a control model is developed that, when product control determines the air volume requirement, provides a constant air volume CFM at a specific static pressure by controlling power and speed. In Figure 9, the characteristic curve represents the constant wind volume physical characteristics that maintain control power and speed. For all motor rated power ranges, for any type of airflow system designed air conditioning manufacturer, based on power test results and speed curves, It is concluded that a typical quadratic function can be well used to develop modeling as a typical function, P = C _{1 +} C ₂ x _{n +} C ₃ x _n ² , by selecting three on the curve To be fixed (A, B and C), the data on the corresponding coordinates are (pl, nl), (p2, n2), (p3, n3). Obtain the coefficients Cl, C2, C3, as shown in the following formula:

F(A, B, C) = ^ "! (Yi -(Cl + C2*n + C3* n ² )† , by solving the equation by a F/3A = 0, = 0, and dF/dC = 0 , m=3.

The process of curve fitting is to select a polynomial to describe the curve, and the coefficients of the polynomial can be obtained by the least squares method. In theory, P = C ₁ + C ₂ x _n + C ₃ x _n ² + ... + Cmxn ^m - ^{1 can be used} , and the binomial can be selected to meet the general needs. The function relation P = f(n) is a second-order function: P = C _{1 +} C ₂ x _{n +} C ₃ xn ² , where _Cl , ^ and ^ are coefficients, n is the motor speed value, several of the tests Any target air volume in the target air volume corresponds to a set of _Ci , ^, and ^ coefficients and is stored. The microprocessor obtains a corresponding set of C^PC ₃ coefficients according to the input target air volume value IN-CFM, thereby obtaining a function. The relation P=f(n), each target air volume in a load corresponds to a group, C^PC ₃ coefficient The details are as shown in Table 1 below:

Table 1

Figure 10 is a plot of the experimental data of the direct power control H constant air volume of a 1 / 3 HP fan motor in a small pipe air conditioning system. For a given target airflow, the system selects some typical air volume CFM as a test point. A database is used to build a mathematical model. These typical points include minimum and maximum air volume values, with some intermediate points added according to product specifications. Typical air volume CFM is used as test points for five, 150 I 300 I 450 / 600 and 750 CFM.

Table 2 shows an example of the test data results. The speed of the motor ranges from 200 to 1400 rpm; the static pressure of the system ranges from 0.1 to 1 H ₂ 6». Maintain the preset constant air volume CCFM output and obtain a value corresponding to the motor input power of Figure 10 to form a database.

Table 2

1163 32. 4% Using the least squares method, each predetermined CFM air volume corresponds to a quadratic function of power and speed, obtained in a standard calculation method: These equations define the power of any system with a specific static pressure The speed of the work point. When the set air volume IN-CFM preset is input, the motor system defines a function corresponding to it, and the trajectory of its working point follows the function definition. Equations (3) through (7) can be expressed as a standard equation, and Cl, C2, and C3 are constants.

Power(150) = 0.3388 (-^—) ² - 0.1551 (-^—) + 0.0458 (3)

1000 1000

Power (300) = 0.4423 ( - 0.2113 ( ) + 0.0765

1000 1000

Power(450) = 0.3987( Γ - 0.0308 ( ) + 0.0294 (5)

1000 1000

Power (600) = 0.2580 ( + 0.3983 ( ) - 0.1379

1000 1000

Power (750) = 0.1385 ( ) + 0.8150 ( ) - 0.3139 (7)

1000 1000

That is, P=C _{1 +} C ₂ x _{n +} C ₃ xn ^{2 is obtained} . Equations (3) to (7) The modeling curve provides the trajectories of five selected operating points for several constant air volume CFM requirements. Power is power, n It is the speed.

As shown in Figure 11, if the requested constant air volume IN-CFM requirement is not one of the modeling curves, an interpolation method is used to obtain a new characteristic equation to fit the requested constant air volume IN-CFM, for example when requested The constant air volume IN-CFM=525cfm is required to be received, and the adjacent two curves CFMl_600cfm and CFM2-450cfm can be identified. Then two corresponding equations can be used to calculate the new equation for the IN_CFM=525cfm curve. Based on the demand IN-CFM=525cfm, three selected speeds ω 1 , ω 2 , ω 3 , determine the power values calculated at these speeds, using the equations corresponding to the two model curves for the dual power points At the selected speed, linear weighted interpolation can be used to calculate the P value. First

The matrix data is listed below.

For a pair of power points (/3⁄4, /3⁄4) corresponding to a selected velocity ω, the selected velocity ω 1 , ω 2 , ω 3 corresponds to 3 pairs of power points (p _u , p _2i linear weighted interpolation can be used to calculate Pi value

= ― ).

CFM - CFM 2

: The value W is calculated like this: w =

CFM1 - CFM 2

Note the CFM2 IN-CFM CFM1, etc. 0 W 1. The matrix equation below can be calculated,

The corresponding function P = + C ₂ xn + C ₃ xn ² of IN_CFM = 525 cfm can be obtained. To solve this matrix equation, the coefficients for Cl, C2, and C3 can be calculated. Therefore, the power equation can be obtained for any required input air volume IN-CFM. Since this process is completed by the microprocessor-microcontroller in the motor controller, the power calculation does not need to consume more real-time CPU resources.

It can be seen that this direct power control DPC (Direct Power Control) uses speed control to achieve power control. The function of the power/speed control logic is to coordinate the power/speed loop time constant to ensure system stability. Control can be controlled by controlling the precise control of the motor and torque control. Whether in scalar or vector control, speed control is more effective than torque control. Improve control accuracy.

DPC control is speed controlled through unique power and fan load speed characteristics. From zero speed to high speed, the power is also increased from zero to increasing. The speed of the motor will rise until it reaches a pair of operating points A (power, speed), which is the static pressure point. As shown in Figure 13, when the static pressure suddenly increases, the motor provides more power in the speed control mode (or Greater torque) Maintaining speed, due to the high static pressure requires a large power requirement. The power will suddenly rise to a higher level when the motor system reaches one For a new working point of "B" at the same speed, the algorithm will know if this is at a constant CFM trajectory curve operating point, thus determining a pair of power/speed points "C". But point C is not a stable working point, due to the high power requirements, then go to the "D" point, repeat, and so on to converge to a new stable working point "G", ending.

In implementation, we can reduce the sudden increase in power fluctuations by using limited power gain control. It is shown in Figure 14, and the incremental power can be specified as Δ Ρ. As long as the power changes beyond this power increment Δ Ρ, the speed control will perform speed control. In this way, all operating points operate at a positive and negative bandwidth corresponding to the constant air volume CFM trajectory curve. The airflow control system during the static pressure change transition is stable.

As shown in Figure 15, the above-mentioned motor direct power control constant air volume control method and algorithm have been tested on our wind turbine controller, and all system performance meets the requirements shown in Figure 15.

Figure 12 is a logic block diagram of the algorithm in the scalar control application of the fan motor. The input power is calculated from the DC bus voltage and current. The power and speed will be limited to the maximum power ^, and the speed.

The real-time input power value Pi of the motor is calculated by the feedback DC bus current/voltage. Then, according to the externally input air volume IN-CFM and the power/speed data, the calculated value Pt of the motor input power is obtained, and the calculated value Pt of the motor input power is compared with The real-time output power Pi of the motor obtains the power difference Δ Ρ, and the power difference Δ Ρ is limited to avoid the power difference Δ Ρ being too large, and the adjustment power fluctuation is large. The power difference Δ Ρ is output through the power/speed control logic, and the speed loop is controlled. The PWM inverter performs the speed control. The scalar control is used to collect the real-time bus current I _bus and the real-time bus voltage to calculate the real-time input power of the motor P = / _te x V _bus . The principle of air volume measurement of fan motor is as follows:

Based on the above theoretical analysis: Figure 10 is the experimental data fitting curve of the direct power control constant air volume of the 1 / 3HP fan motor in the small pipe air conditioning system, the air volume CFM as the test point has 5, respectively 150, 300, Equations (3) through (7) are obtained at 450, 600, and 750 CFM. Table 2 shows an example of the test data results. The speed of the motor ranges from 200 to 1400 rpm; the static pressure of the system ranges from 0.1 to 1 H ₂ 6», maintaining the preset constant air volume CCFM output, obtaining a corresponding figure 10 Machine input power standard value. And describe the input of any air volume data that is no longer the above five working points, such as the function of IN-CFM=525cfm

+ ^ χη ² can be obtained. Solve the matrix equation and calculate the Cl, C2, and C3 coefficients. Therefore, the power equation can be obtained for any required input air volume IN-CFM. That is, the target air volume of any input can obtain the constant air volume control function P= C ₁ + C ₂ xn + C ₃ xn ^{2 corresponding to the} target air volume.

Reverse reasoning according to the above principle: Then, when the motor is operating in a steady state, the current real-time power Po and the speed no of the motor are measured, as shown in Fig. 16, through the point M ((Po, no), we It can be inferred that the point (Po, no) is on the curve CFM0 of the constant air volume control, and the air volume value corresponding to the point M ( Ρο, ηο) is also known. The derivation process is as follows:

It is between the two known air volume curves. We substitute Ρ0 into equations (3) to (7) to obtain the rotational speeds η (150), η (300), η (450), η (600), and η (750) corresponding to the five air volumes. No is between the two known constant air volume curves. It is assumed that the point M ( Po, no) is between the constant air volume curves CFM1 and CFM2. When the input power is equal to Po, the constant air volume curves CFM1 and CFM2 correspond to the respective rotational speeds. For nl, n2, the constant air volume value of the point M (Po, no) is CFM0=CFM2+ (CFM1-CFM2) X (n2- no) ÷ (n2-nl), where CFMK CFM2 is the air volume 150, n (300), One of 450, 600, 750. From the above derivation, it can be known that the real-time power Po and the rotational speed no of the motor are known to obtain the air volume value CFM0 output by the air-conditioning system. When the deviation of the detected air volume is less than the set air volume, the air filter is clogged and Output signal alarm.

Embodiment 2: An air cleaner, as shown in FIG. 17, includes a casing 100. An air purification unit 106, a fan motor 101, a wind wheel or a wind wheel 102, and an air filter 103 are installed in the casing 100. A air duct is disposed in the air casing 100. The air duct is provided with an air inlet 104 and an air outlet 105. The air filter 103 and the wind wheel 102 are installed in the air duct. The fan motor drives the fan or the wind wheel 102 to rotate, so that the air enters the air from the air inlet 1104. And passing through the purification process of the air filter 103 and the air purification unit 106, and then outputting from the air outlet 105, the fan motor 101 adopts a BLDC motor or an ECM motor, including The motor unit and the motor controller, the motor unit includes a rotating shaft, a permanent magnet rotor assembly, a stator assembly and a casing assembly, the permanent magnet rotor assembly and the stator assembly form a magnetic coupling, and the stator assembly includes a stator core and a winding The coil winding on the stator core, the motor controller comprises a microprocessor, an inverter circuit and an operating parameter detecting circuit, the output end of the inverter circuit is connected with the coil winding, and the operating parameter detecting circuit inputs the detected signal to The microprocessor, the output end of the microprocessor controls the inverter circuit, and the fan motor is used as the component for detecting the air volume. When the deviation between the detected air volume and the set air volume reaches a certain value, it is determined that the air filter is clogged and alarmed. The air purification unit 106 can be an ultraviolet lamp or a negative ion generator. The fan motor works in the constant air volume control mode. The microprocessor first measures whether the actual power reaches the rated power. If the measured actual power reaches the rated power, the deviation between the detected air volume and the set air volume is determined. When the set air volume below 90% is detected, it is judged that the air filter is clogged. When the deviation between the detected air volume and the set air volume reaches a certain value, the microprocessor controls the alarm circuit to alarm, indicating that the air filter is clogged, the alarm circuit may be an audible alarm circuit, or a photoelectric alarm circuit, and the alarm circuit is arranged in the motor controller. .

Embodiment 3:

An air conditioning system includes a body, and a compressor, a heat exchanger, a fan motor, a wind wheel, an air filter, and an air conditioning system total control circuit board are installed in the body, and a duct is arranged in the body, and an air inlet is arranged in the air duct. And an air outlet, an air filter and a wind wheel are installed in the air duct, the fan motor drives the wind wheel to rotate, and the fan motor uses a BLDC motor or an ECM motor, including a motor unit and a motor controller, and the motor unit The utility model comprises a rotating shaft, a permanent magnet rotor assembly, a stator assembly and a casing assembly, the permanent magnet rotor assembly and the stator assembly form a magnetic coupling, the stator assembly comprises a stator core and a coil winding wound on the stator core, the motor controller The utility model comprises a microprocessor, an inverter circuit and an operating parameter detecting circuit. The output end of the inverter circuit is connected with the coil winding, the operating parameter detecting circuit inputs the detected signal to the microprocessor, and the output end of the microprocessor controls the inverter circuit. The air conditioning system total control circuit board is electrically connected to the motor controller, and is characterized by: using the fan motor as the detection wind The component, when the detected air volume is lower than the set air volume, it is judged that the air filter is clogged, and the air conditioning system may be a split air conditioner, a cabinet air conditioner, a window air conditioner, a multi-line air conditioner, a duct air conditioner, a commercial coiler. Air conditioning, patio machine air conditioning. It can be set that when the set air volume is less than 90%, it is judged that the air filter is clogged. The air conditioning system total control circuit board inputs the set air volume to the fan motor, and the microprocessor detects the air volume in real time. When detecting the air volume and setting When the deviation of the air volume reaches a certain value, the microprocessor controls the alarm circuit to alarm, prompting the air filter to be blocked. The alarm circuit can be an audible alarm circuit or a photoelectric alarm circuit. The alarm circuit can be arranged on the air conditioning system total control circuit board, or The layout is in the motor controller. The alarm circuit can include the original liquid crystal display of the air conditioning system. The microprocessor first transmits the alarm signal to the air conditioning system total control circuit board. The air conditioning system always controls the circuit board output signal to the liquid crystal display, using text or A pattern to indicate that the air filter is clogged. The fan motor works in the constant air volume control mode. The microprocessor first measures whether the actual power reaches the rated power. If the measured actual power reaches the rated power, and then determines the deviation between the detected air volume and the set air volume, the fan motor can work in the constant air volume control mode. The microprocessor first measures whether the actual power reaches the rated power. If the measured actual power reaches the rated power, and the deviation between the detected air volume and the set air volume reaches a certain value, an alarm is issued; when the detected air volume deviates from the set air volume, Within the allowable range, choose not to alarm. The fan motor can work in the constant torque control mode. When the deviation between the detected air volume and the set air volume reaches a certain value, it is determined that the air filter is clogged and alarmed. The fan motor can work in the constant speed control mode. When the deviation between the detected air volume and the set air volume reaches a certain value, it is determined that the air filter is clogged and alarmed.

Claims

Rights request

1 . A filter plugging detection method for a wind blowing device, wherein the air blowing device comprises an air inlet, an air outlet, a air duct, a fan or a wind wheel, a fan motor and an air filter, and the air filter is installed on the air duct. The fan motor drives the fan or the wind wheel to rotate, so that the air enters the air duct from the air inlet and passes through the air filter, and then outputs from the air outlet. The utility model is characterized in that: the fan motor is used as the component for detecting the air volume, when the detected air volume is lower than the set air volume. , It is judged that the air filter is clogged and a signal alarm is output.

2 . The method for detecting clogging of a filter of a wind blowing device according to claim 1 , wherein: the air blowing device is a split air conditioner, or a cabinet air conditioner, or a window air conditioner, or It is a multi-connected air conditioner, or a duct air conditioner, or a commercial coiler air conditioner, or a patio air conditioner, or an HVAC system, or an air freshener, or an air purifier.

3 . The method for detecting clogging of a filter of a wind blowing device according to claim 1 , wherein: the fan motor adopts a BLDC motor or an ECM motor, and includes a motor unit and a motor controller, and the motor is The unit includes a rotating shaft, a permanent magnet rotor assembly, a stator assembly and a casing assembly, the permanent magnet rotor assembly and the stator assembly form a magnetic coupling, the stator assembly includes a stator core and a coil winding wound on the stator core, the motor The controller comprises a microprocessor, an inverter circuit and an operating parameter detecting circuit. The output end of the inverter circuit is connected with the coil winding, and the operating parameter detecting circuit inputs the detected signal to the microprocessor, and the output end of the microprocessor controls the inverse The variable circuit, the microprocessor sets the function of the air volume calculation, and the measured air volume calculated by the air volume function is related to the real-time running parameters of the motor.

4 . The method for detecting clogging of a filter of a wind blowing device according to claim 3 , wherein: the function of the air volume calculation is Q=F ( POWER , n), wherein POWER is the input power of the motor, and n is the motor. Rotating speed.

The method for detecting the jam of the screen of the air supply device according to claim 1 or 2 or 3, wherein: the fan motor operates in a constant air volume control mode, and the microprocessor first measures whether the actual power reaches the rated power. If the measured actual power reaches the rated power, and the deviation between the detected air volume and the set air volume reaches a certain value, an alarm is issued; when it is detected that the air volume deviates from the set air volume within the allowable range, the alarm is not selected.

The method for detecting the jam of the screen of the air blowing device according to claim 1 or 2 or 3, wherein: the fan motor operates in a constant torque control mode, and the deviation between the detected air volume and the set air volume reaches a certain value. When the value is determined, it is judged that the air filter is clogged and an alarm is issued.

7. The method according to claim 1 or 2 or 3, wherein the fan motor operates in a constant speed control mode, and the deviation between the detected air volume and the set air volume reaches a certain value. When the value is determined, it is judged that the air filter is clogged and an alarm is issued.

8. A blowing device, comprising a body, a wind tunnel is arranged in the body, a fan motor, a wind wheel and an air filter net are installed in the body, an air inlet and an air outlet are arranged in the air duct, and an air filter is installed in the air duct. And the wind wheel, the fan motor drives the wind wheel to rotate, the fan motor uses a BLDC motor or an ECM motor, and includes a motor unit and a motor controller, and the motor unit includes a rotating shaft, a permanent magnet rotor assembly, a stator assembly and a casing The assembly, the permanent magnet rotor assembly and the stator assembly form a magnetic coupling, the stator assembly includes a stator core and a coil winding wound on the stator core, the motor controller including a microprocessor, an inverter circuit, and an operating parameter detection The circuit, the output end of the inverter circuit is connected with the coil winding, the operating parameter detecting circuit inputs the detected signal to the microprocessor, and the output end of the microprocessor controls the inverter circuit, wherein the fan motor inputs the set air volume, the fan The motor is used as a component for detecting the air volume. When the detected air volume is lower than the set air volume, it is determined that the air filter is clogged.

9. The air blowing device according to claim 8, wherein the air blowing device is a split air conditioner, or a cabinet air conditioner, or a window air conditioner, or a multi-connected air conditioner, or a duct air conditioner. , or commercial coiler air conditioner, or patio air conditioner, or HVAC system, or air freshener, or air purifier.

10. A blower according to claim 8 or 9, wherein: when the detected air volume Q1 is lower than a factory set value, it is determined that the air filter is clogged.

11. The air blowing device according to claim 8 or 9, wherein: the air blowing device is provided with a device controller, the device controller inputs a set air volume to the fan motor, and the microprocessor detects the air volume in real time, when detecting When the deviation between the air volume and the set air volume reaches a certain value, the microprocessor controls the alarm circuit to alarm, indicating that the air filter is clogged.

12. A blower apparatus according to claim 11, wherein: the alarm circuit is an audible alarm circuit or a photoelectric alarm circuit.

13. A blower apparatus according to claim 12, wherein: the alarm circuit can be arranged in the device controller or in the motor controller.

14. The air blowing device according to claim 13, wherein: the alarm circuit comprises an original liquid crystal display of the air blowing device, and the microprocessor first transmits an alarm signal to the device controller, and the empty device controller outputs Signal to the LCD display, using text or graphics to alert the air filter to blockage.

15. The air blowing device according to claim 8 or 9, wherein: the fan motor operates in a constant air volume control mode, and when the deviation between the detected air volume and the set air volume reaches a certain value, an alarm is issued; If the air volume and the set air volume deviate within the allowable range, choose not to alarm.

16. The air blowing device according to claim 8 or 9, wherein: the fan motor operates in a constant speed control mode, and when the deviation between the detected air volume and the set air volume reaches a certain value, the air filter is determined. Blocked and alarmed.

17. The air blowing device according to claim 8 or 9, wherein: the fan motor operates in a constant torque control mode, and when the deviation between the detected air volume and the set air volume reaches a certain value, the air filter is determined. Blocked and alarmed.