CN111424399B - Control system and method for variable frequency washing machine based on direct current brushless motor drive - Google Patents
Control system and method for variable frequency washing machine based on direct current brushless motor drive Download PDFInfo
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- CN111424399B CN111424399B CN202010115831.9A CN202010115831A CN111424399B CN 111424399 B CN111424399 B CN 111424399B CN 202010115831 A CN202010115831 A CN 202010115831A CN 111424399 B CN111424399 B CN 111424399B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/18—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual dc motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/08—Arrangements for controlling the speed or torque of a single motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2203/00—Indexing scheme relating to controlling arrangements characterised by the means for detecting the position of the rotor
- H02P2203/03—Determination of the rotor position, e.g. initial rotor position, during standstill or low speed operation
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- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention relates to the technical field of automatic control, in particular to a control system and a control method of a frequency conversion washing machine based on DC brushless motor drive, which comprises a transformer T1, a rectifier, a voltage stabilizer, a current converter, a water level sensor, a water inlet valve, a water discharge valve, a key board, a vibration sensor, a DC brushless motor rotor positioning unit and a controller, wherein mains supply is transformed by the transformer T1, then is converted into DC power by the rectifier, is stabilized by the voltage stabilizer and then is input into the current converter, three windings of the DC brushless motor are connected with the current converter, three Hall sensors of the DC brushless motor are connected with the controller, and the DC brushless motor rotor positioning unit is arranged at the rotor of the DC brushless motor. The substantial effects of the invention are as follows: the accuracy and the safety of control when having improved direct current brushless motor and starting have then improved frequency conversion washing machine's security and reliability.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a control system and a control method for a frequency conversion washing machine based on direct current brushless motor driving.
Background
The brushless direct current motor is composed of a motor main body and a driver, and is a typical electromechanical integration product. The stator winding of the motor is mostly made into a three-phase symmetrical star connection method, which is very similar to a three-phase asynchronous motor. The rotor of the motor is adhered with a magnetized permanent magnet, and in order to detect the polarity of the rotor of the motor, a position sensor, usually a hall sensor, is arranged in the motor. The driver is composed of power electronics, integrated circuits, etc., and functions are: receiving starting, stopping and braking signals of the motor to control the starting, stopping and braking of the motor; receiving a position sensor signal and a positive and negative rotation signal, and controlling the on-off of each power tube of the current converter to generate continuous torque; different rotating speeds are generated by controlling the PMW frequency and the duty ratio of each power tube. The dc motor has a fast response, a large starting torque, and a capability of providing a rated torque from a zero rotation speed to a rated rotation speed, and thus is widely used in home appliances. The core of the household variable frequency washing machine is the direct current brushless motor, and the effective control of the direct current brushless motor is the quality guarantee of the variable frequency washing machine. However, the existing variable frequency washing machine lacks the rotor positioning support for the starting control of the direct current brushless motor, has poor starting control, easily generates the problems of vibration, overcurrent and the like, and has potential safety hazards.
For example, chinese patent CN202099582U, published 2012, 1 month and 4 days, relates to a variable frequency washing machine, which comprises a machine body, a washing tub, an upper computer for controlling the washing machine to work, a permanent magnet synchronous motor, and a frequency converter for controlling the rotation speed of the permanent magnet synchronous motor. The frequency converter comprises a rectifying circuit, an inverter circuit, a current detection circuit, a voltage detection circuit, a control circuit and a communication interface connected with an upper computer. The input end of the control circuit is respectively connected with the current detection circuit and the voltage detection circuit, the output end of the control circuit is connected with the inverter circuit, and the control circuit is in communication connection with the communication interface. According to the technical scheme, the frequency converter of the variable frequency washing machine adopts current closed-loop control, so that the influences of installation errors of a Hall sensor in a motor and a motor tooth socket effect can be compensated, the requirement on the motor is obviously reduced, and the efficiency is higher; in addition, the current waveform is more sinusoidal and thus easier to pass EMC testing. However, current detection and the hall sensor both need to generate signals under the condition of motor rotation, and cannot acquire the accurate position of a motor rotor when starting, so that the starting control is poor, and the safety is low.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the technical problem that the control accuracy of the existing variable frequency washing machine is not high is solved. A control system and method for a frequency conversion washing machine based on a direct current brushless motor drive with more accurate control are provided.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a control system of a frequency conversion washing machine based on a direct current brushless motor drive comprises a transformer T1, a rectifier, a voltage stabilizer, a current converter, a water level sensor, a water inlet valve, a water outlet valve, a key board, a vibration sensor, a direct current brushless motor rotor positioning unit and a controller, wherein the transformer T1, the rectifier, the voltage stabilizer and the current converter are sequentially connected, a primary coil of a transformer T1 is connected with a mains supply, the mains supply is transformed by a transformer T1 and then is converted into direct current through the rectifier and input into the current converter after being stabilized by the voltage stabilizer, three windings of the direct current brushless motor are connected with the current converter, three Hall sensors of the direct current brushless motor are connected with the controller, the controller controls the direct current brushless motor to rotate and commutate according to a preset washing scheme through the current converter, the direct current brushless motor rotor positioning unit is installed at a direct current brushless motor rotor to detect the position of the direct current motor, the water inlet valve, the water discharge valve, the key board, the vibration sensor and the direct current brushless motor rotor positioning unit are all connected with the controller. The commercial power is transformed into a stable direct current voltage after transformation, rectification and voltage stabilization, and then the stable direct current voltage is input into a current converter, which is also called an inverter bridge. The controller controls the on-off of each power tube of the current converter to realize the rotation control of the motor. The rotor positioning unit of the direct current brushless motor can detect the position of the electronic rotor, so that the motor can be controlled more accurately during starting or reversing starting.
Preferably, the rectifier includes a filter inductor Lf, a capacitor C1, a diode D1, and a diode D2, the secondary winding of the transformer T1 has a center tap, the anode of the diode D1 and the anode of the diode D2 are respectively connected to two ends of the secondary winding of the transformer T1, the cathode of the diode D1 and the cathode of the diode D2 are both connected to one end of the filter inductor Lf, the other end of the filter inductor Lf is connected to the anode of the capacitor C1, the cathode of the capacitor C1 is connected to the center tap of the secondary winding of the transformer T1, and the capacitor C1 is an electrolyte capacitor. After being rectified by the diode D1 and the diode D2, the capacitor C1 obtains direct-current voltage, and the filter inductor Lf can reduce the fluctuation amplitude of the direct-current voltage.
Preferably, the voltage regulator is a three-terminal voltage regulator U1, an input end of the three-terminal voltage regulator U1 is connected with a positive electrode of the capacitor C1, a ground end of the three-terminal voltage regulator U1 is connected with a negative electrode of the capacitor C1, and an output end of the three-terminal voltage regulator U1 is connected with the inverter as a direct current power supply end. The three-terminal voltage regulator U1 can provide stable direct current voltage to supply power for the direct current brushless motor.
Preferably, the rotor positioning unit of the brushless direct current motor comprises a rotary table and a camera, the rotary table is coaxially and fixedly connected with a rotor of the brushless direct current motor, a plurality of marking scales are printed on the rotary table along the circumference of the rotary table, the marking scales are in non-circle-center symmetrical distribution, the camera is fixedly installed below the rotary table, the camera shoots an image of the rotary table and is connected with the controller, and the controller obtains the position of the rotor of the brushless direct current motor by analyzing the image of the rotary table. The rotor upper rotating disk image is obtained through the camera, the position of the rotor can be obtained when the rotor is static, and the accuracy of motor starting control is improved.
Preferably, the number of the marked scales is 8, the central angles between the 8 marked scales are 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees, 70 degrees and 80 degrees in sequence, and intervals are formed between every two adjacent marked scales. Selecting a point on a turntable as a reference point, wherein the reference point is positioned in the radial range of a mark scale, the position of the reference point corresponding to the pixel coordinate of a camera shooting image is fixed, after a rotor rotates and stops, the camera shooting image is transmitted to a controller, the controller extracts an image near the reference point corresponding to the pixel coordinate to obtain a central angle between adjacent mark scales at two sides of the reference point corresponding to the pixel coordinate, if the corresponding pixel coordinate of the reference point is just overlapped with the mark scale, the controller searches for the adjacent mark scales in the clockwise direction to obtain the central angle, which interval is rotated to the original reference point position can be known through the central angle, the interval is increased by 0.1 degrees from the initial angle of the interval, the image is circularly compared with the image rotated by 0 degrees after the image is rotated along the set direction until the overlap ratio of the image rotated with the image rotated by 0 degrees reaches a set threshold value, the degree of image rotation uniquely determines the position of the rotor.
Preferably, the system further comprises an overcurrent protection unit which is connected between the primary coil of the transformer T1 and the mains supply in series.
Preferably, the overcurrent protection unit comprises a current transformer, a current-limiting resistor R1, a spring, a fixed contact and a movable contact, the movable contact is connected with a mains supply through an electric lead, the fixed contact is connected with a primary coil of a transformer T1, the movable contact is pressed on the fixed contact by the spring, the current transformer is coupled with the electric lead, the output end of the current transformer is connected with the current-limiting resistor R1 and two ends of the spring in series, one end of the spring is fixedly connected with the movable contact, and the other end of the spring is fixed. When the current is too large, the current sensed by the current transformer is also large enough, and the spring overcomes the reaction force generated by the pre-compression amount of the spring under the action of the induced current, so that the spring is further contracted, and the moving contact and the static contact are driven to be separated, so that the current is cut off, and subsequent electronic components are protected.
Preferably, the moving contact is provided with a protrusion, and the fixed contact is provided with a recess matched with the protrusion. The convex side surface of the moving contact is a conical surface. The contact area of the moving contact and the static contact can be increased by the protrusion and the depression, and the contact resistance is reduced.
Preferably, the overcurrent protection unit further comprises an electric pin and a contact sensor, the electric pin is arranged on one side of the moving contact, the moving contact is provided with a step matched with the electric pin, the contact sensor is fixedly installed on one side, far away from the static contact, of the moving contact, the contact sensor is triggered when the moving contact is separated from the static contact by a certain distance, the electric pin simultaneously clamps the step, and the electric pin and the contact sensor are both connected with the controller. The electric pin and the contact sensor can avoid the repeated vibration of the moving contact.
A control method for a frequency conversion washing machine based on direct current brushless motor driving is suitable for the control system for the frequency conversion washing machine based on direct current brushless motor driving, and comprises the following steps: A) the key board receives the settings of opening, water level setting and washing mode; B) after the input of the key board is started, the controller controls the water inlet valve to be opened and the water discharge valve to be closed until the water injection reaches the water level setting; C) the controller obtains starting of the brushless direct current motor according to the position of the rotor, generates a corresponding PMW sequence according to the washing mode setting, and controls the brushless direct current motor to commutate according to the washing mode; D) the controller controls the water inlet valve and the water discharge valve according to the washing mode to complete a preset washing mode; E) and the controller opens the drain valve, and when the water level sensor detects that the water level drops to a preset value, the brushless direct current motor is started and the drain valve is kept open for drying until the water level sensor detects that the water level drops to a second preset threshold value.
Preferably, in the step E), while drying, the controller simultaneously monitors the vibration amplitude detected by the vibration sensor, and when the vibration amplitude exceeds a set threshold, opens the water inlet valve and closes the water discharge valve until the water injection reaches the water level setting in the step a), and then starts the brushless dc motor to rotate for a period of time, and then re-enters the step E) to execute.
The substantial effects of the invention are as follows: the controller controls the on-off of each power tube of the current converter to realize the rotation control of the motor; the rotor positioning unit of the direct current brushless motor can detect the position of the electronic rotor, so that the motor can be controlled more accurately during starting or reversing starting; the accuracy and the safety of control when having improved direct current brushless motor and starting have then improved frequency conversion washing machine's security and reliability.
Drawings
Fig. 1 is a block diagram of a control system of an inverter washing machine according to an embodiment.
Fig. 2 is a schematic structural diagram of a rotor positioning unit of a dc brushless motor according to an embodiment.
Fig. 3 is a schematic structural diagram of an overcurrent protection unit according to an embodiment.
Fig. 4 is a flow chart of a control method of an inverter washing machine according to an embodiment.
Wherein: 100. the overcurrent protection device comprises an overcurrent protection unit 101, a current transformer 102, a movable contact 103, a fixed contact 104, an electric pin 105, a contact sensor 106, a spring 201, a PMW converter 202, a Hall sensor 301, an MCU 302, a drain valve 303, a water inlet valve 304, a key board 305, a vibration sensor 306, a water level sensor 401, a rotor 500, a camera 501, a rotary table 502, a mark scale 503 and a reference point.
Detailed Description
The following provides a more detailed description of the present invention, with reference to the accompanying drawings.
The first embodiment is as follows:
a control system of a frequency conversion washing machine based on a DC brushless motor drive is disclosed, as shown in figure 1, the embodiment comprises a transformer T1, a rectifier, a voltage stabilizer, a current converter, a water level sensor 306, a water inlet valve 303, a water outlet valve 302, a key board 304, a vibration sensor 305, a DC brushless motor rotor 401 positioning unit and a controller 301, the transformer T1, the rectifier, the voltage stabilizer and the current converter are sequentially connected, a primary coil of the transformer T1 is connected with commercial power, the commercial power is transformed into DC power by the transformer T1 and then is input to the current converter after being stabilized by the voltage stabilizer, three windings of the DC brushless motor are connected with the current converter, three Hall sensors 202 of the DC brushless motor are connected with the controller 301, the controller 301 controls the DC brushless motor to rotate and commutate according to a preset washing scheme by the current converter, the DC brushless motor rotor 401 positioning unit is installed at the DC brushless motor rotor 401, the position of the dc brushless motor rotor 401 is detected, and the water inlet valve 303, the water outlet valve 302, the key board 304, the vibration sensor 305, and the positioning unit of the dc brushless motor rotor 401 are connected to the controller 301. The inverter comprises six electronic switches and a PMW converter 201, the six electronic switches are VT1, VT2, VT3, VT4, VT5 and VT6 respectively, the VT1, VT2, VT3, VT4, VT5 and VT6 are all connected with the PMW converter 201, and the PMW converter 201 is connected with the controller 301.
The rectifier comprises a filter inductor Lf, a capacitor C1, a diode D1 and a diode D2, a secondary coil of the transformer T1 is provided with a center tap, an anode of a diode D1 and an anode of a diode D2 are respectively connected with two ends of the secondary coil of the transformer T1, a cathode of the diode D1 and a cathode of the diode D2 are both connected with one end of the filter inductor Lf, the other end of the filter inductor Lf is connected with an anode of a capacitor C1, a cathode of the capacitor C1 is connected with the center tap of a secondary coil of the transformer T1, and the capacitor C1 is an electrolyte capacitor. The voltage stabilizer is a three-terminal voltage stabilizer U1, the input end of the three-terminal voltage stabilizer U1 is connected with the anode of the capacitor C1, the grounding end of the three-terminal voltage stabilizer U1 is connected with the cathode of the capacitor C1, and the output end of the three-terminal voltage stabilizer U1 is connected with the current converter as a direct current power supply end. The three-terminal voltage regulator U1 can provide stable direct current voltage to supply power for the direct current brushless motor.
As shown in fig. 2, the positioning unit of the dc brushless motor rotor 401 includes a turntable 501 and a camera 500, the turntable 501 is coaxially and fixedly connected with the rotor 401 of the dc brushless motor, a plurality of marking scales 502 are printed on the turntable 501 along the circumference of the turntable 501, the marking scales 502 are non-circularly and symmetrically distributed, the camera 500 is fixedly installed below the turntable 501, the camera 500 shoots an image of the turntable 501 and is connected with the controller 301, and the controller 301 obtains the position of the rotor 401 of the dc brushless motor by analyzing the image of the turntable 501. The camera 500 is used for acquiring images of the turntable 501 on the rotor 401, so that the position of the rotor 401 can be acquired when the rotor 401 is static, and the accuracy of motor starting control is improved.
The number of the marked scales 502 is 8, the central angles between the 8 marked scales 502 are 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees, 70 degrees and 80 degrees in sequence, and an interval is formed between every two adjacent marked scales 502. A point is selected on a turntable 501 as a reference point 503, the reference point 503 is located in the radial range of a mark scale 502, the position of the reference point 503 corresponding to the pixel coordinate of the image shot by a camera 500 is fixed, after a rotor 401 rotates and stops, the image shot by the camera 500 is transmitted to a controller 301, the controller 301 extracts the image near the pixel coordinate corresponding to the reference point 503 to obtain the central angle between the adjacent mark scales 502 on the two sides of the pixel coordinate corresponding to the reference point 503, if the pixel coordinate corresponding to the reference point 503 is just overlapped with the mark scale 502, the adjacent mark scale 502 is searched clockwise to obtain the central angle, which interval is rotated to the position of the original reference point 503 can be known through the central angle, the interval is started from the initial angle of the interval and is increased by 0.1 degree, the image after the image rotates along the set direction is compared with the image when the image rotates by 0 degree in a circulating mode until the image overlapping degree when the image rotates by 0 degree reaches the set threshold value, the degree of image rotation uniquely determines the position of rotor 401.
As shown in fig. 3, the overcurrent protection unit 100 is connected in series between the primary coil of the transformer T1 and the mains. The overcurrent protection unit 100 comprises a current transformer 101, a current-limiting resistor R1, a spring 106, a fixed contact 103 and a movable contact 102, wherein the movable contact 102 is connected with a mains supply through an electric lead, the fixed contact 103 is connected with a primary coil of a transformer T1, the movable contact 102 is pressed on the fixed contact 103 by the spring 106, the current transformer 101 is coupled with the electric lead, the output end of the current transformer 101 is connected with the current-limiting resistor R1 and two ends of the spring 106 in series, one end of the spring 106 is fixedly connected with the movable contact 102, and the other end of the spring 106 is fixed. When the current is too large, the current induced by the current transformer 101 is also large enough, and the spring 106 overcomes the reaction force generated by the pre-compression amount of the spring 106 under the action of the induced current, so that the spring 106 further contracts and drives the moving contact 102 to be separated from the static contact 103, thereby cutting off the current and protecting subsequent electronic components. The moving contact 102 has a protrusion and the stationary contact 103 has a recess matching the protrusion. The convex side of the movable contact 102 is a conical surface. The protrusion and the recess can increase the contact area of the movable contact 102 and the fixed contact 103, and reduce the contact resistance. The electric pin 104 is arranged on one side of the movable contact 102, the movable contact 102 is provided with a step matched with the electric pin 104, the contact sensor 105 is fixedly arranged on one side, away from the fixed contact 103, of the movable contact 102, the contact sensor 105 is triggered when the movable contact 102 is separated from the fixed contact 103 by a certain distance, the electric pin 104 simultaneously blocks the step, and the electric pin 104 and the contact sensor 105 are both connected with the controller 301. The electric pin 104 and the contact sensor 105 can prevent the movable contact 102 from vibrating repeatedly.
A control method for a dc brushless motor-based variable frequency washing machine, which is suitable for the control system for a dc brushless motor-based variable frequency washing machine, as shown in fig. 4, includes the following steps: A) the key board 304 receives the settings of the opening, the water level setting and the washing mode; B) after the input of the key board 304 is started, the controller 301 controls the water inlet valve 303 to be opened and the water discharge valve 302 to be closed until the water injection reaches the water level setting; C) the controller 301 obtains the starting of the brushless direct current motor according to the position of the rotor 401, the controller 301 generates a corresponding PMW sequence according to the washing mode setting, and controls the brushless direct current motor to commutate according to the washing mode; D) the controller 301 controls the water inlet valve 303 and the water outlet valve 302 according to the washing mode to complete a preset washing mode; E) the controller 301 opens the drain valve 302, and when the water level sensor 306 detects that the water level drops to a preset value, the brushless dc motor is started and the drain valve 302 is kept open to dry until the water level sensor 306 detects that the water level drops to a second preset threshold value.
In the step E), during drying, the controller 301 simultaneously monitors the vibration amplitude detected by the vibration sensor 305, and when the vibration amplitude exceeds a set threshold, opens the water inlet valve 303 and closes the water discharge valve 302 until the water injection reaches the water level setting in the step a), and then starts the brushless dc motor to rotate for a period of time, and then re-enters the step E) to execute.
The embodiment has the beneficial effects that: the controller 301 controls the on-off of each power tube of the converter to realize the rotation control of the motor; the positioning unit of the direct current brushless motor rotor 401 can detect the position of the electronic rotor 401, so that the motor can be controlled more accurately during starting or reversing starting; the accuracy and the safety of control when having improved direct current brushless motor and starting have then improved frequency conversion washing machine's security and reliability.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (7)
1. A control system of a frequency conversion washing machine based on a DC brushless motor drive is characterized in that,
the device comprises a transformer T1, a rectifier, a voltage stabilizer, a current converter, a water level sensor, a water inlet valve, a water discharge valve, a key board, a vibration sensor, a direct current brushless motor rotor positioning unit and a controller, wherein the transformer T1, the rectifier, the voltage stabilizer and the current converter are sequentially connected, a primary coil of the transformer T1 is connected with mains supply, the mains supply is transformed by a transformer T1 and then converted into direct current through the rectifier, the direct current is stabilized by the voltage stabilizer and then input into the current converter, three windings of the direct current brushless motor are connected with the current converter, three Hall sensors of the direct current brushless motor are connected with the controller, the controller controls the direct current brushless motor to rotate and commutate according to a preset clothes washing scheme through the current converter, the direct current brushless motor rotor positioning unit is installed at a direct current brushless motor rotor to detect the position of the direct current brushless motor rotor, and the water inlet valve, the key board, the water discharge valve, the key board and the controller are connected with the voltage regulator, the direct current brushless motor rotor positioning unit is connected with the motor rotor positioning unit, and the motor, the motor rotor positioning unit are connected with the transformer, and the motor, so that the motor rotor, the motor are connected with the motor, and the motor, the motor, Vibration sensor and brushless DC motor rotor positioning unit all are connected with the controller, brushless DC motor rotor positioning unit includes carousel and camera, carousel and brushless DC motor's the coaxial fixed connection of rotor, the printing has a plurality of mark scale along the carousel circumference on the carousel, the mark scale is non-centre of a circle symmetric distribution, camera fixed mounting is in carousel below, the camera shoots the carousel image and is connected with the controller, the controller obtains brushless DC motor's rotor position through analysis carousel image, the mark scale is total 8, the central angle between 8 mark scales is 10 °, 20 °, 30 °, 40 °, 50 °, 60 °, 70 ° and 80 ° in proper order, constitutes the interval between two adjacent mark scales, select a point on carousel 501 as the reference point 503, reference point 503 is located mark scale 502 in radial scope, the reference point 503 is fixed corresponding to the pixel coordinate position of the image captured by the camera 500, and after the rotor 401 rotates and stops, the camera 500 captures an image and transmits the image to the controller 301, the controller 301 extracts an image near a pixel coordinate corresponding to the reference point 503 to obtain a central angle between adjacent marking scales 502 on both sides of the pixel coordinate corresponding to the reference point 503, if the pixel coordinate corresponding to the reference point 503 is exactly overlapped with the marking scales 502, the adjacent marked scales 502 are searched clockwise, a central angle is obtained, which section is rotated to the position of the original reference point 503 can be known through the central angle, the section is started from the starting angle and is increased by 0.1 degrees, the image is circularly rotated along the set direction and then compared with the image rotated by 0 degrees, until the coincidence degree of the image rotated by the image and the image rotated by 0 degrees reaches the set threshold value, and the degree of image rotation uniquely determines the position of the rotor 401.
2. The control system of the inverter washing machine based on the DC brushless motor driving according to claim 1,
the rectifier comprises a filter inductor Lf, a capacitor C1, a diode D1 and a diode D2, a secondary coil of the transformer T1 is provided with a middle tap, an anode of a diode D1 and an anode of a diode D2 are respectively connected with two ends of the secondary coil of the transformer T1, a cathode of a diode D1 and a cathode of a diode D2 are both connected with one end of the filter inductor Lf, the other end of the filter inductor Lf is connected with an anode of a capacitor C1, a cathode of the capacitor C1 is connected with the middle tap of a secondary coil of the transformer T1, and a capacitor C1 is an electrolyte capacitor.
3. The control system of the inverter washing machine based on the DC brushless motor driving according to claim 2,
the voltage stabilizer is a three-terminal voltage stabilizer U1, the input end of the three-terminal voltage stabilizer U1 is connected with the anode of a capacitor C1, the grounding end of the three-terminal voltage stabilizer U1 is connected with the cathode of a capacitor C1, and the output end of the three-terminal voltage stabilizer U1 is connected with the current converter as a direct-current power supply end.
4. The control system for the inverter washing machine based on the DC brushless motor driving according to claim 1, 2 or 3,
the transformer T1 is characterized by further comprising an overcurrent protection unit which is connected between the primary coil of the transformer T1 and the mains supply in series.
5. The control system of the inverter washing machine based on the DC brushless motor driving according to claim 4,
the overcurrent protection unit comprises a current transformer, a current-limiting resistor R1, a spring, a static contact and a moving contact, wherein the moving contact is connected with a mains supply through an electric lead, the static contact is connected with a primary coil of a transformer T1, the spring presses the moving contact on the static contact, the current transformer is coupled with the electric lead, the output end of the current transformer is connected with the current-limiting resistor R1 and two ends of the spring in series, one end of the spring is fixedly connected with the moving contact, and the other end of the spring is fixed.
6. A control method of a frequency conversion washing machine based on DC brushless motor drive, which is suitable for the control system of the frequency conversion washing machine based on DC brushless motor drive according to any one of claims 1 to 5,
the method comprises the following steps:
A) the key board receives the settings of opening, water level setting and washing mode;
B) after the input of the key board is started, the controller controls the water inlet valve to be opened and the water discharge valve to be closed until the water injection reaches the water level setting;
C) the controller obtains starting of the brushless direct current motor according to the position of the rotor, generates a corresponding PMW sequence according to the washing mode setting, and controls the brushless direct current motor to commutate according to the washing mode;
D) the controller controls the water inlet valve and the water discharge valve according to the washing mode to complete a preset washing mode;
E) and the controller opens the drain valve, when the water level sensor detects that the water level drops to a preset value, the brushless direct current motor is started, the drain valve is kept open, and drying is carried out until the water level sensor detects that the water level drops to a second preset threshold value.
7. The method for controlling the inverter washing machine based on the DC brushless motor driving according to claim 6,
and E), during drying, simultaneously monitoring the vibration amplitude detected by the vibration sensor by the controller, opening the water inlet valve and closing the water discharge valve until the water injection reaches the water level setting in the step A) when the vibration amplitude exceeds a set threshold value, and then starting the brushless direct current motor to rotate for a period of time and then entering the step E) again to execute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010115831.9A CN111424399B (en) | 2020-02-25 | 2020-02-25 | Control system and method for variable frequency washing machine based on direct current brushless motor drive |
Applications Claiming Priority (1)
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