Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
  • F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D25/00—Pumping installations or systems
  • F04D25/02—Units comprising pumps and their driving means
  • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
  • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
  • F05D2270/00—Control
  • F05D2270/30—Control parameters, e.g. input parameters
  • F05D2270/304—Spool rotational speed
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
  • F05D2270/00—Control
  • F05D2270/30—Control parameters, e.g. input parameters
  • F05D2270/335—Output power or torque
• • 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

Definitions

• the invention relates to a method for measuring the air volume of a fan motor.
• the motor in the traditional household air conditioner generally adopts single-phase AC motor PSC, single-phase AC motor, low efficiency, relatively energy consumption, high noise, and controllable intelligence. The degree is low.
• 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.
• ECM electrostatic clutched motor
• BLDC MOTOR Brushless DC motor
• the DC motor control board is connected to the air conditioner main board.
• 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.
• 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.
• the object of the present invention is to provide a method for measuring the air volume of a fan motor, which can accurately determine the air filter network. It blocks and outputs a signal alarm, and the mathematical model is simple, the control is reliable, and the precision is high.
• a method for measuring air volume by a fan motor characterized in that: it comprises the following steps:
• CFM0 CFMi+ (CFMi- 1-CFMi) X (ni-no) ⁇ (ni- ni- 1).
• the several air volume points CFMi described above include the maximum output air volume and the minimum output air volume.
• the fan motor described above adopts a BLDC motor or an ECM motor, including 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 assembly, a permanent magnet rotor assembly and a stator assembly.
• the stator assembly includes a stator core and a coil winding wound on the stator core
• the motor controller includes a tantalum processor, 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 ⁇ processor, the output end of the ⁇ processor controls the inverter circuit, and the ⁇ processor inputs the set target air volume, and detects the air volume in real time.
• CFM0 is lower than the set target air volume, and the output signal is alarmed.
• the fan motor described above operates in a constant air volume control mode, and the ⁇ processor 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 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 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 invention has the following effects:
• the mathematical model is simple, the control is reliable, and the accuracy is high.
• the fan motor works in the constant air volume control mode.
• the ⁇ processor 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 Q1 and the set air volume Q0 is determined.
• the scheme is simple, ⁇ processing The amount of calculation is small and the feasibility is high.
• FIG. 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;
• 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 11 is a graph showing the fitting curve of the experimental data of the arbitrary input air volume by using the interpolation method of the fan motor of the present invention.
• Figure 12 is a control logic diagram of a constant air volume control method of the fan motor of the present invention.
• FIG. 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
• Fig. 16 is a schematic diagram of the wind volume measurement of the fan motor of the present invention.
• the present invention is shown in Fig. 1.
• a typical air conditioning ventilation duct referred to as a duct
• an air blowing system such as a gas stove or an air handler
• the figure is replaced by "motor + wind wheel”.
• 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. As a result, the actual air volume will vary depending on the blast system of the conventional single-phase AC motor-PSC motor in different pipes.
• the fan motor used in the invention is a BLDC motor or an ECM motor.
• 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.
• the motor controller includes a ⁇ processor MCU or DSP electronic board for motor control. It has a power supply section that supplies power to each part of the controller circuit. The power supply is to set a DC bus 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.
• 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.
• Tube Road 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.
• 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 chirp processor, 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 ⁇ processor.
• the bus current detecting circuit inputs the detected bus circuit to the ⁇ processor, and the bus voltage detecting circuit inputs the DC bus voltage to the ⁇ processor, and the ⁇ processor controls the inverse.
• the variable circuit controls the on and off of the coil windings of the respective phases of the stator assembly 12.
• the fan motor is a 3-phase brushless DC permanent magnet synchronous motor
• 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-step 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.
• the inverter circuit is composed of electronic switch tubes Ql, Q2, Q3, Q4, Q5, Q6, and the control terminals of the electronic switch tubes Ql, Q2, Q3, Q4, Q5, Q6 are respectively processed by the processor
• the output 6 PWM signals (Pl, P2, P3, P4, P5, P6) are 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 Go to the processor.
• the motor input power control is controlled by the electronic switch tube Q7, and the 1-channel P! signal output by the ⁇ processor is P0 to control the electronic switch tube. Q7's on-time to control motor input power.
• 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
• the motor controller includes ⁇ processor, 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 ⁇ processor
• the ⁇ processor calculates the real-time speed n of the motor according to the rotor position signal, the bus current detecting circuit inputs the bus current to the ⁇ processor, the bus voltage detecting circuit inputs the DC bus voltage to the ⁇ processor, and the ⁇ processor controls the inverter circuit.
• the inverter circuit controls the on and off of the coil windings of the stator components of the stator assembly, and the ⁇ processor controls the motor input power control circuit, and the following features:
• Step A) Start the motor controller, receive or preset the target air volume value IN-CFM;
• the interpolation function may be used to calculate a function corresponding to any external input target air volume value IN-CFM. f (n). The constant air volume control of the arbitrary target air volume is realized.
• Equation P f (n).
• the function relation P f (n) is a second-order function: .
• 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.
• the characteristic curve represents the constant wind volume physical characteristics that maintain control power and speed, based on the rated power range of all motors, for any type of air conditioning system designed for air conditioning systems, based on Power test results and speed curves, it can be concluded that a typical quadratic function can be well used to develop modeling as a typical function, P + xn + C ⁇ n 2 , by selecting on the curve
• the three to-be-determined points (A, B and C), the corresponding coordinates on the data are ( ⁇ , ⁇ ), ( ⁇ 2, ⁇ 2), ( ⁇ 3, ⁇ 3) take the coefficients Cl, C2, C3, see the following formula :
• 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.
• P C 1 + C 2 x n + C 3 x n 2 + ... + Cmxn m - 1
• P f(n) is a second order function: + ⁇ 2 , where Cl , ⁇ and ⁇ are coefficients, n is the motor speed value, and any one of the target air volumes tested corresponds to a set, C ⁇ PC 3 coefficient and stored, and the processor is based on the input.
• each target air volume corresponds to a group, ⁇ and ⁇ coefficients. The details are as shown in Table 1 below:
• Figure 10 is a plot of the experimental data of the direct power control of a 1 / 3 HP fan motor in a small pipe air conditioning system. For a given target airflow, the system selects some typical wind CFM as a test point to build a The database is used to build mathematical models. These typical points include the most Small and maximum air volume values, with some intermediate points added according to product specifications, typical air volume CFM as test points are 5, 150 I 300 I 450 / 600 and 750 CFM respectively
• 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.
• each predetermined CFM wind volume corresponds to a quadratic function of power and speed, obtained in a standard calculation method:
• These equations define the power and the speed of the operating point of any system at a particular static pressure.
• 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 C3 is a constant.
• the modeling curve provides the trajectory of five selected operating points for several constant air volume CFM requirements, Power is power and n is speed.
• the matrix data is listed below.
• this direct power control DPC uses speed control for 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.
• the motor rotates from zero to high speed, and 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.
• A power, speed
• the algorithm will know if this is at a constant CFM trajectory curve operating point, thus determining a pair of power / Speed point "C;”. But point C is not a stable working point, due to the high power requirement, then go to the "D" point, repeat, and so on to converge to a new stable working point "G", ending.
• 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 /7.
• the real-time input power value Pi of the motor is calculated by the feedback DC bus current/voltage.
• 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 ⁇ , and the power difference ⁇ is limited to avoid the power difference ⁇ being too large, and the adjustment power fluctuation is large.
• the power difference ⁇ is output through the power/speed control logic, and the speed loop is controlled.
• the PWM inverter performs the speed control.
• the principle of air volume measurement of fan motor is as follows:
• 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, At 450, 600, and 750 CFM, equations (3) through (7) are obtained.
• Table 2 shows an example of the test data results.
• the motor's speed range is from 200 to 1400 rpm; the system's static pressure is from 0.1 to 1H 2 6», and the preset constant air volume CCFM output is maintained to obtain a value corresponding to the motor input power of Figure 10.
• any air volume data that is no longer the above five working points.
• 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, any input target air volume can get the constant air volume control letter corresponding to the target air volume.
• the speeds corresponding to the lines CFMI and CFM2 are respectively nl, n2, and the constant air volume value CFM0-CFM2+ (CFM1-CFM2) X (n2- no) ⁇ (n2-nl) of the point M (Po, no), where CFMK CFM2 is One of the air volumes 150, n (300), 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, it is determined that the air filter is clogged and Output signal alarm.
• Embodiment 2 is a diagrammatic representation of Embodiment 1:
• a method for measuring air volume by a fan motor characterized in that: it comprises the following steps:
• CFM0 CFMi+ (CFMi- 1-CFMi) X (ni-no) ⁇ (ni- ni- 1). .
• F (n ) is obtained by: collecting the original data first, in the air duct equipment, for the M target air volume, from the low static pressure to the high static pressure, the static pressure can cover The actual static pressure range of the application, in the process of adjusting the static pressure, let the motor be
• the fan motor works 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 judged that the air filter is clogged and alarmed. There are at least five M air volume points to ensure that the real-time detection air volume CFM0 is calculated. Precision.
• Embodiment 3 is a certain value.
• a method for measuring air volume by a fan motor characterized in that: it comprises the following steps:
• CFM0 CFMi+ (CFMi- 1-CFMi) X (ni-no) ⁇ (ni- ni- 1). .
• F (n ) The motor output torque Q is proportional to the operating current of the motor, so the motor output torque Q can be calculated by detecting the operating current of the motor.
• the fan motor works 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 and alarmed, and at least 5 M air volume points are used to ensure the meter.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Aviation & Aerospace Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Control Of Motors That Do Not Use Commutators (AREA)
• Control Of Positive-Displacement Air Blowers (AREA)
• Control Of Electric Motors In General (AREA)

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• 2014
  • 2014-07-23 CA CA2934585A patent/CA2934585C/en active Active
  • 2014-07-23 MX MX2016007013A patent/MX351652B/es active IP Right Grant
  • 2014-07-23 WO PCT/CN2014/082814 patent/WO2016011618A1/zh not_active Ceased
  • 2014-07-23 JP JP2016530183A patent/JP6254276B2/ja active Active
  • 2014-07-23 KR KR1020167018552A patent/KR101815408B1/ko active Active
• 2015
  • 2015-10-19 US US14/886,118 patent/US10233933B2/en active Active

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