CN104734578B - A kind of brshless DC motor water pump - Google Patents
A kind of brshless DC motor water pump Download PDFInfo
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- CN104734578B CN104734578B CN201410784937.2A CN201410784937A CN104734578B CN 104734578 B CN104734578 B CN 104734578B CN 201410784937 A CN201410784937 A CN 201410784937A CN 104734578 B CN104734578 B CN 104734578B
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Abstract
The present invention proposes a kind of brshless DC motor water pump.Including one drive circuit, diode, main Absorption Capacitance, discharge resistance, pull-up resistor are suppressed by main control chip, Schottky diode, voltage transient and constituted；The anode termination power positive end mouthful of the Schottky diode, the cathode terminal of Schottky diode connects the positive source port that the voltage transient suppresses cathode terminal, main Absorption Capacitance, discharge resistance, pull-up resistor and the main control chip of diode simultaneously；The voltage transient suppresses the anode tap of diode and another termination power cathode port of main Absorption Capacitance and discharge resistance；The dutycycle speed-regulating instruction input pin of the main control chip is connected with the pull-up resistor other end；The motor phase windings connection pin of the main control chip is connected with 3 U/V/W windings of three-phase brushless motor respectively；Three phase windings of the brushless electric machine use star connection.The present invention improves pump efficiency, reduces noise and Oscillation Amplitude, improves stability when water pump is used.
Description
Technical field
The invention belongs to family's electro-technical field, and in particular to a kind of brshless DC motor water pump.
Background technology
Air conditioner has generation cold air and the ability to indoor air-supply, in indoor hot-air to be carried out to heat exchanging process,
Condensed water can be produced on the heat exchanger, so being generally provided with draining pump in air conditioner, mainly avoid natural drainage not smooth
When, it is easy to discharge condensed water.At present, drainage pump of air conditioner typically more uses split-pole draining pump, but the split-pole draining efficiency of pump is low,
Typically 12% or so, but also it can produce that noise is big, the bad influence such as pump vibration is big.
Meanwhile, also there is defect in the drive circuit of conventional water pump：(1) conventional motor-drive circuit is, single master
The external Gate Drive circuits of the external MOSFET+ of chip+6 are controlled, are designed and line, due to the device in design
Part selects more, and line is complicated, and whole circuit control system reliability is relatively low；(2) routine MOSFET manufacturing process, its electric conduction
Resistance is general more than 0.5 ohm, and chip exterior needs the metal fin for connecting larger area to be radiated；(3) conventional nothing
Brush motor, using 120 degree of conducting technologies, the conducting and switching of motor phase windings are bursts, and current waveform is similar to square wave ripple
Shape, its rush of current harmony wave component is very big, and larger noise is carried out to motor belt motor；(4) conventional driving circuit of brushless electric machine, one
As do not account for the practical situations of reverse power connection and EMI abnormal voltage spikes, designed circuit is often because of operation
Person's wiring error, static electricity on human body, EMI interference etc., cause circuit premature failure, this is also that many conventional products reliabilities are not high
A major reason.
On the whole, due to there is above-mentioned technical problem in existing water water pump so that existing pump efficiency is low, noise big, shake
Dynamic big, performance is unstable.
The content of the invention
It is an object of the invention to propose a kind of brshless DC motor water pump, which raises pump efficiency, noise is reduced
And Oscillation Amplitude, improve stability when water pump is used.
Solve above-mentioned technical problem technical scheme be：A kind of brshless DC motor water pump, including one drive circuit, are used to
Driven by power and the control of the brushless electric machine are provided；The drive circuit includes main control chip, Schottky diode, voltage
Transient supression diode, main Absorption Capacitance, discharge resistance, pull-up resistor；Wherein, the anode termination electricity of the Schottky diode
Source positive pole port, the cathode terminal of Schottky diode connects the voltage transient and suppresses the cathode terminal of diode, main absorption simultaneously
Electric capacity, discharge resistance, the positive source port of pull-up resistor and main control chip；The voltage transient suppresses the anode of diode
The other end of end and main Absorption Capacitance and discharge resistance connects power cathode port；The dutycycle speed governing of the main control chip refers to
Input pin is made to be connected with the pull-up resistor other end；The main control chip motor phase windings connection pin respectively with three-phase brushless
3 U/V/W windings connection of motor；The coiling end of three phase windings of the brushless electric machine welds together.
It is preferred that the Schottky diode is used to prevent from damaging brshless DC motor water pump because of power supply mistakenly reversal connection
Whole circuit；The voltage transient, which suppresses diode, to be used for by the voltage clamp at its two ends in a certain number range, for preventing
Only input voltage is extremely over-pressed；The main Absorption Capacitance is used for burning voltage, absorbs EMI voltage surges；The discharge resistance is used
The electric charge released when motor is being closed on main Absorption Capacitance.
It is preferred that the integrated multiple unit control circuits of main control chip, and by 6 metal oxide semiconductcor field effects
Should pipe composition inverter bridge；The multiple unit control circuit includes：Analog to digital conversion circuit, for that will refer to from dutycycle speed governing
Make the digital dutycycle speed-regulating instruction signal of input pin be converted into analog quantity, and be sent to sine-wave drive circuit；Sine wave
Wave generator circuit, according to the signal of motor-field position detecting circuit, produces slightly concave " bell " waveform in a centre, sends
Give MOSFET gate drive circuits；MOSFET gate drive circuits, for driving corresponding MOSFET element in inverter bridge；Excessively stream
Protection circuit, the electric current for detecting motor phase windings, when electric current exceedes a certain threshold value, turns off machine winding；Reference voltage
Reference circuit, for carrying out correct operating voltage to internal each unit circuit；Pulse width modulation oscillation generating circuit, it is internal
PWM duty cycle hunting of frequency benchmark is set, the PWM duty cycle modulating frequency in machine winding is determined；Start-up logic controls circuit,
For brushless electric machine in power-up moment until being switched to the drive control in counter electromotive force commutation stage.
It is preferred that the multiple unit control circuit also includes overheating protection circuit, set when the temperature of main control chip exceedes
After fixed temperature, the three-phase for cutting off brushless electric machine is exported.
It is preferred that the multiple unit control circuit also includes motor-field position detecting circuit, for detecting motor three
The counter electromotive force of phase winding, is converted according to counter electromotive force, obtains magnetic field position signal during the correct commutation of machine winding, and
It is sent to sine waveform and occurs circuit.
It is preferred that also including housing, brushless electric machine and the drive circuit are encapsulated in the housing, and drive circuit is pacified
In a driving plate；The rotary shaft of the brushless electric machine stretches out hull outside；The pump fixed with the hull outside rotary shaft
Impeller；The water outlet lid fixed and covered on the impeller of pump with the housing；The hull outside is provided with U-shaped buckle；Institute
Stating housing includes pump housing upper casing and pump housing lower casing, and pump housing upper casing and pump housing lower casing offer multiple connections in correspondence position respectively
Pump housing upper casing, is fixedly connected by hole with will pass through holding screw with pump housing lower casing；It is located at the pump housing in the brushless electric machine rotary shaft
Place one retaining ring of suit on the inside of upper casing；Water outlet mouth sealing ring is provided between the impeller of pump and water outlet lid.
It is preferred that the buckle of mutual cooperation is provided with the pump housing upper casing and water outlet lid, to be fixedly connected with the pump housing
Upper casing and water outlet lid.
It is preferred that being fixed with installation foot pad and shock-absorbing foot pad on the outside of the pump housing lower casing.
It is preferred that the brushless electric machine includes the electric motor end cap assembled successively, Graphite pad, rubber seal, rotor set
Part, oiliness bearing component, plastic packaging stator component；Wherein, the bearing block lower end of the oiliness bearing component is placed on stator module
In internal cavities, the rotor assembly is sleeved on the oiliness bearing of oiliness bearing component, and the Graphite pad is bonded in motor
In the shrinkage pool of end cap, the rubber seal is arranged on the step on the outside of plastic packaging stator component, and the electric motor end cap is pressed in modeling
Seal and on the step of stator module rubber seal is pressed in middle and fixed.
It is preferred that the plastic packaging stator component includes the multiple stator cores being arranged on plastic skeleton, the plastics bone
Rounded cavity is used to install oiliness bearing component inside frame；Coil of the coiling outside the stator core；The plastics
Skeleton is fixed in driving plate, and the outlet of the coil is welded in the driving plate and is connected with power line；The driving plate
On tension disc is installed, for compressing power line；The multiple stator core and the plastic skeleton shape in driving plate by plastic packaging
Into plastic packaging stator component.
Compared with prior art, it is of the invention to be significantly a little, it is (1) specially designed electric machine built-in driving structure, outer
Rotor structure, outer rotor shell go out axle construction and plastic package structure, realize efficient, energy-conservation, emission reduction, install and safeguard all very convenient, together
When realize the high degree of protection of comparison；(2) waterproof is considered in the design of motor, stator and circuit board section have been carried out whole
The plastic packaging of body, circuit part is completely isolated with water, even if directly contacting the danger that there will not be short circuit with water；(3) pump shell
U-shaped buckle, convenience quick for installation are installed；(4) shock-absorbing foot pad and installation foot pad installed significantly reduce the vibrations of motor；(5)
Gate Drive circuits and 6 MOSFET elements are all integrated into single U1 main control chips by the present invention so that on circuit board
Main control chip U1 peripheral circuit is very succinct, significantly reduces the entire area of circuit board, can install and be built into and be " micro-
It is small-sized " brushless electric machine in, whole electric system is reliably substantially improved；(6) present invention application 180 degree sine wave drive skill
Art, reduces the noise that Motor torque is impacted, phase conversion impact is brought；(7) in the present invention, surge absoption and counnter attack are applied
Connect, the technology such as voltage breakdown is held back to, so as to the circuit that is prevented effectively from caused by power supply wiring mistake, circuit devcie overvoltage etc. and
The problems such as failure and damage of component and big noise.
Brief description of the drawings
Fig. 1 is the driving circuit principle block diagram in the present invention.
Fig. 2 is the integrated multiple unit control circuit fundamental diagrams of main control chip in the present invention, wherein, VSP is duty
Than speed-regulating instruction input pin, FG is that tacho-pulse feeds back output pin；OUTA/OUTBOUTC is motor phase windings connecting tube
Pin；GND is that power cathode connects pin, and VREG is reference voltage base, and Protection is current foldback circuit, Gate
Drive is MOSFET gate drive circuits, and Sine Drive Waveshape are that circuit occurs for sine waveform, and ADC is modulus
Change-over circuit；TSD is overheating protection circuit, and StartUP Logic are that start-up logic controls circuit, and 30KHz PWM OSC are
30KHz pulse width modulation oscillation generating circuits, Position Detect are motor-field position detecting circuit.
Fig. 3 is electric machine built-in drive waveforms figure in the present invention.
Fig. 4 is brshless DC motor water pump stereogram of the present invention.
Fig. 5 is brshless DC motor water pump explosive view of the present invention.
Fig. 6 is the brshless DC motor explosive view that the present invention is used.
Fig. 7 is stereogram of the motor stator before plastic packaging in the present invention.
Fig. 8 is the explosive view of motor oiliness bearing component in the present invention.
Number explanation in accompanying drawing：
1：Pump outlet；2：Sealing ring；3：Impeller of pump；4：Upper pump casing；5：Retaining ring；6：Brushless electric machine；7：Lower pump body；
8：Foot pad is installed；9：Shock-absorbing foot pad；10：Holding screw；6-1：Electric motor end cap；6-2：Graphite pad；6-3：Rubber seal；6-
4：Rotor assembly；6-5：Oiliness bearing component；6-6：Plastic packaging stator component；6-5-1：Bearing cap；6-5-2：Oiliness bearing；6-5-
3：Lubricating oil；6-5-4：Bearing block；6-6-1：Stator core；6-6-2：Plastic skeleton；6-6-3：Coil；6-6-4：Driving plate；
6-6-5：Tension disc；6-6-7：Power line.
Embodiment
It is readily appreciated that, according to technical scheme, in the case where not changing the connotation of the present invention, this area
Those skilled in the art can imagine the numerous embodiments of brshless DC motor water pump of the present invention.Therefore, it is real in detail below
It is only the exemplary illustration to technical scheme to apply mode and accompanying drawing, and is not to be construed as the whole of the present invention or regards
For the limitation or restriction to technical solution of the present invention.
Brshless DC motor water pump of the present invention includes a drive circuit, and the electric power to provide the brushless electric machine 6 drives
Dynamic and control.The drive circuit includes main control chip U1, Schottky diode SD1, voltage transient and suppresses diode TD1, master
Absorption Capacitance C1, discharge resistance R1, pull-up resistor R2；
Schottky diode SD1 anode termination power positive end mouthful VCC, Schottky diode SD1 cathode terminal is simultaneously
Connect cathode terminal, main Absorption Capacitance C1, discharge resistance R1, pull-up resistor R2 and master control core that voltage transient suppresses diode TD1
Piece U1 VCC positive sources port；
Voltage transient suppresses diode TD1 anode tap and main Absorption Capacitance C1 and discharge resistance R1 another termination electricity
Source negative pole port GND；
Main control chip U1 PWMI pin (the VSP pins in dutycycle speed-regulating instruction input pin, as Fig. 7) and pull-up electricity
The R2 other ends are hindered to be connected；
Main control chip U1 U/V/W pin (motor phase windings connection pin), respectively with 3 U/V/W of 3 phase brushless electric machines around
Group connection.
In above-mentioned drive circuit：
Schottky diode SD1 is used to prevent from damaging brshless DC motor water pump because of power supply mistakenly reversal connection entirely electric
Road；
Voltage transient suppresses diode TD1, can be by the voltage clamp at its two ends at certain based on the avalanche effect of electronics
One numerically, for preventing the exception of input voltage over-pressed, protects whole circuit；
Main Absorption Capacitance C1 is used for burning voltage, absorbs EMI voltage surges；
Discharge resistance R1 is used for the electric charge released when closing motor on main Absorption Capacitance C1；
Pull-up resistor R2, because brushless electric machine 6 need not carry out rotating speed speed governing, therefore directly passes through resistance by PWMI pins
R2 is pulled upward to VCC positive sources, the need for meeting PWMI pin input logic high level；
Three phase windings of motor use the coiling starting end of the phase winding of star connection, i.e., three to be respectively defined as U/V/W, will
The coiling end of 3 phase windings welds together, and is defined as COM ends, and " neutral point " of star winding is also at COM ends.
The drive circuit is installed on circuit boards, in above-mentioned drive circuit：Schottky diode SD1 and voltage transient
Suppressing diode TD1 realizes surge absoption and counnter attack connection technology, wherein, Schottky diode SD1 has unilateral conduction, such as
Fruit power supply is just connect, and Schottky diode SD1 forward conductions are opened, and whole circuit loop is unimpeded；If reverse power connection, now Xiao Te
Based diode SD1 is in " reverse bias " state, very high resistance is showed, equivalent to "off" state, whole circuit pathways
Blocked by SD1, no reverse current flows through；And be not allow to flow counterflow through electric current in main control chip U1, so as to be prevented effectively from
Circuit is damaged because of power supply wiring mistake.Voltage transient suppresses diode TD1, when cathode voltage exceeds " breakdown threshold ",
The semiconductor PN that voltage transient suppresses in diode TD1 will be in " electron avalanche " state, (several to receive within the extremely short time
Second) PN junction reverse breakdown, under this reverse breakdown state, its PN junction voltage will be maintained at predetermined " snowslide " value (only than " hitting
Wear threshold value " slightly higher), so that model of the voltage clamp being connected with voltage transient suppression diode TD1 two ends in a safety
In enclosing, it is to avoid circuit devcie over-voltage breakdown and damage.The avalanche breakdown effect that voltage transient suppresses diode TD1 is different there is provided EMI
The conducting loop of normal high pressure spike energy, and the abnormal peak voltages of EMI are clamped down in the scope of a safety, it is to avoid circuit and
The failure and damage of component.
Further, in above-mentioned drive circuit, main control chip U1 is integrated with multiple unit control circuits, and by 6
The inverter bridge of MOSFET (metal oxide semiconductor field effect tube) compositions；Each unit control circuit realiration brushless electric machine 6 is had
The every control function having and various defencive functions, as shown in fig. 7, multiple unit control circuits include：
TSD circuits (overheating protection circuit), after main control chip U1 temperature exceedes the temperature of setting, such as main control chip
U1 temperature reaches after 150 degrees Celsius that TSD circuit operations, the three-phase of cut-out brushless electric machine 6 is exported, machine winding and power supply VCC
Will be switched off, motor stalling, it is to avoid because brushless electric machine 6 is overheated and to the infringement caused by main control chip U1；
Adc circuit (analog to digital conversion circuit), for numeral " dutycycle speed-regulating instruction " signal from PWMI to be converted into
One analog quantity, is sent to Sine Drive Waveshape (sine-wave drive circuit)；For modulating during three-phase windings conducting
Dutycycle, reach the purpose debugged to brushless electric machine 6；
Sine Drive Waveshape circuits (sine waveform generation circuit), according to Position Detect (motors
Magnetic field position detect circuit) signal, produce slightly concave " bell " waveform in a centre, be sent to Gate Drive (MOSFET
Pole drive circuit), when after MOSFET pipes conducting, machine winding access VCC power supplys, it turns on waveform and is shown in Fig. 8, in Fig. 8,
OUTA/OUTB/OUTC is three phase electric machine U/V/W windings connection end, and iA/iB/iC is respectively the electricity in motor phase windings U/V/W
Stream, shows perfect sine waveform；
Gate Drive (MOSFET gate drive circuits), are directly controlled by Sine Drive Waveshape circuits,
For driving corresponding MOSFET element in inverter bridge, turn it on, machine winding is connected into power supply VCC loops；The present invention
Gate Drive circuits and 6 MOSFET elements are all integrated into single main control chip U1 so that main on drive circuit board
The peripheral circuit for controlling chip U1 is very succinct, significantly reduces the entire area of circuit board, can install and be built into and be " small
In the brushless electric machine of type ", whole electric system is reliably substantially improved；Meanwhile, " Sine Drive Waveshape " and
" application of 180 degree sinewave drive technique in the present invention of Gate Drive " circuit realirations, it is whole by controlling MOSFET to manage
In individual turn-on cycle, the PWM duty cycle size in different time region is (see Fig. 8, Motor Terminal PWM (OUTA) ripple
Shape) so that the equivalent voltage waveform on OUTA obtains slightly concave " bell " waveform in a centre, finally obtain in the windings one it is complete
Beautiful sine-wave current waveform；The electromagnetic torque that this sine-wave current waveform passed through in the winding is formed, will tend to be constant,
Commutation between phase and phase is seamlessly transitted, and can reduce torsional impact, the noise that phase conversion impact is brought；
Protection (current foldback circuit), the electric current for detecting motor phase windings, when electric current exceedes a certain threshold value
When, machine winding is turned off, the purpose of limiting motor winding current is realized；
VREG circuits (reference voltage base circuit), are powered that there is provided a correct work to internal each unit circuit
Make voltage；
Position Detect (motor-field position detecting circuit), by detecting the counter electromotive force of motor three-phase windings,
Converted according to counter electromotive force, obtain magnetic field position signal during the correct commutation of machine winding, be ultimately sent to Sine
Drive Waveshape circuits；
30KHz PWM OSC (30KHz pulse width modulations oscillation generating circuit), internal PWM duty cycle hunting of frequency base
Standard, is fixed as 30KHz；The final PWM duty cycle modulating frequency determined in machine winding；
StartUP Logic (start-up logic control circuit), for motor in power-up moment, until being switched to counter electromotive force
The drive control in commutation stage；
Foregoing each unit controls circuit by semiconductor fabrication process, is made on same Silicon Wafer.
During brshless DC motor pump working of the present invention, VCC and GND is connected to the both positive and negative polarity of dc source respectively
Afterwards, Schottky diode SD1 forward conductions；Supply voltage is correctly added on main control chip U1.It is each built in main control chip U1
Individual unit control circuit starts action：
First, StartUP Logic circuits start constantly to carry out break-make control to 6 MOSFET according to " start-up algorithm "
System, machine winding U/V/W is constantly powered and cut off successively, the magnetic field of a rotation is formed on the stator of motor, according to magnetic
Between " homopolar-repulsion, there is a natural attraction between the sexes " principle, and on rotor magnetic field (rotor inner wall equipped with one circle magnet steel, N S magnetic poles it is equal
Even distribution) interaction, produce electromagnetic torque motor and continuously rotate.When Position Detect electric circuit inspections
During to sufficiently large U/V/W phase winding back-emfs, " sine wave " drive pattern is automatically switched to, one is formed in machine winding
Sine-wave current waveform, to reduce noise.
The present invention is brshless DC motor water pump, is mainly used in air conditioner discharging condensed water, its monnolithic case such as Fig. 4 institutes
Show, internal structure is as shown in figure 5, including water pump water outlet lid 1, water outlet mouth sealing ring 2, impeller of pump 3, pump housing upper casing 4, retaining ring
5th, brushless electric machine 6, pump housing lower casing 7, installation foot pad 8, shock-absorbing foot pad 9 and holding screw 10.
Pump housing upper casing 4 and pump housing lower casing 7 are used to contain brushless electric machine 6, and during assembling, brushless electric machine 6 is placed under the pump housing
In shell 7, then pump housing upper casing 4 is fixed with pump housing lower casing 7；Its center of middle pump body upper casing 4 is provided with wears for the rotary shaft of brushless electric machine 6
The hole crossed.As preferably selection scheme, pump housing upper casing 4 offers multiple connecting holes in correspondence position respectively with pump housing lower casing 7,
Pump housing upper casing 4 is fixedly connected with pump housing lower casing 7 with will pass through holding screw 10.
In one embodiment of the invention, it is increase sealing, pump housing upper casing can be located in the rotary shaft of brushless electric machine 6
Place one retaining ring 5 of suit of 4 inner sides, with prevent water by the hole of pump housing upper casing 4 and rotary shaft gap into brushless
Motor 6.
Impeller of pump 3 is sleeved in the rotary shaft of the brushless electric machine 6 in the outside of pump housing upper casing 4, and water pump water outlet lid 1 has pump leaf
The adaptable cavity of wheel 3 is used to accommodate impeller of pump 3, and water pump water outlet lid 1 is fixed on the outside of pump housing upper casing 4.Impeller of pump 3 and water pump
Water outlet mouth sealing ring 2 is additionally provided between water outlet lid 1 to strengthen sealing.It is used as preferably selection scheme, the He of pump housing upper casing 4
Water pump water outlet lid 1 is provided with the buckle of mutual cooperation, to be fixedly connected with pump housing upper casing 4 and water pump water outlet lid 1.
As preferably selection scheme, the outside of pump housing lower casing 7 can also install foot pad 8 and shock-absorbing foot pad 9, what is used
During play a part of damping, protection motor is given a shock, and can also obstruct the vibrations of motor in itself.
As shown in fig. 6, brushless electric machine 6 includes electric motor end cap 6-1, Graphite pad 6-2, the rubber seal 6- assembled successively
3rd, rotor assembly 6-4, oiliness bearing component 6-5, plastic packaging stator component 6-6；Wherein, oiliness bearing component 6-5 bearing block 6-
5-4 lower ends are placed in stator module 6-6 internal cavities, and rotor assembly 6-4 is sleeved on oiliness bearing component 6-5 oiliness bearing
On 6-5-2, Graphite pad 6-2 is bonded in electric motor end cap 6-1 shrinkage pool, and rubber seal 6-3 is arranged on plastic packaging stator component
On step on the outside of 6-6, electric motor end cap 6-1 is pressed on plastic packaging stator component 6-6 step is pressed in centre rubber seal 6-3
And it is fixed, rubber seal 6-3 can play sealed effect, while can also play a part of obstructing the noise of motor.Motor
End cap 6-1 press-fits after stator module 6-6, whole motor installation, and now Graphite pad 6-2 can withstand rotor assembly 6-4
Rotating shaft, prevent rotor assembly 6-4 play.
As shown in fig. 7, plastic packaging stator component 6-6 includes the multiple stator core 6-6- being arranged on plastic skeleton 6-6-2
Rounded cavity is used to install oiliness bearing component 6-5 inside 1, plastic skeleton 6-6-2, and coiling is outside stator core 6-6-1
The coil 6-6-3 in portion, plastic skeleton 6-6-2 are fixed on driving plate 6-6-4, and coil 6-6-3 outlet is welded on driving plate 6-
6-4 is upper and is connected with power line 6-6-7, and tension disc 6-6-5 is provided with driving plate 6-6-4, for compressing power line 6-6-7,
Multiple stator core 6-6-1 and plastic skeleton 6-6-2 are by plastic packaging in driving plate 6-6-4 formation plastic packaging stator components 6-6.
Claims (9)
1. a kind of brshless DC motor water pump, it is characterised in that including one drive circuit, to provide the brshless DC motor
Driven by power and control；The drive circuit include main control chip, Schottky diode, voltage transient suppress diode,
Main Absorption Capacitance, discharge resistance, pull-up resistor；Wherein,
The anode termination power positive end mouthful of the Schottky diode, the cathode terminal of Schottky diode connects the electricity simultaneously
Press the power positive end of cathode terminal, main Absorption Capacitance, discharge resistance, pull-up resistor and the main control chip of transient supression diode
Mouthful；
The other end of anode tap and main Absorption Capacitance and discharge resistance that the voltage transient suppresses diode connects power supply and born
Extreme mouth；
The dutycycle speed-regulating instruction input pin of the main control chip is connected with the pull-up resistor other end；
The motor phase windings connection pin of the main control chip is connected with the U/V/W windings of three-phase brushless dc motor respectively；
The integrated multiple unit control circuits of main control chip, and be made up of 6 metal oxide semiconductor field effect tubes
Inverter bridge；The multiple unit control circuit includes：
Analog to digital conversion circuit, for the digital dutycycle speed-regulating instruction signal from dutycycle speed-regulating instruction input pin to be changed
Into analog quantity, and it is sent to sine-wave drive circuit；
Circuit occurs for sine waveform, according to the signal of motor-field position detecting circuit, produces the slightly concave " clock in a centre
Type " waveform, is sent to MOSFET gate drive circuits；
MOSFET gate drive circuits, for driving corresponding MOSFET element in inverter bridge；
Current foldback circuit, the electric current for detecting motor phase windings, when electric current exceedes a certain threshold value, turns off machine winding；
Reference voltage base circuit, for carrying out correct operating voltage to internal each unit circuit；
Pulse width modulation oscillation generating circuit, inside sets PWM duty cycle hunting of frequency benchmark, determines in machine winding
PWM duty cycle modulating frequency；
Start-up logic controls circuit, for brshless DC motor in power-up moment until being switched to the drive in counter electromotive force commutation stage
Dynamic control.
2. brshless DC motor water pump as claimed in claim 1, it is characterised in that
The Schottky diode is used to prevent from damaging the whole circuit of brshless DC motor water pump because of power supply mistakenly reversal connection；
The voltage transient, which suppresses diode, to be used for by the voltage clamp at its two ends in a certain number range, for preventing input
Electric voltage exception overvoltage；
The main Absorption Capacitance is used for burning voltage, absorbs EMI voltage surges；
The discharge resistance is used for the electric charge released when closing motor on main Absorption Capacitance；
The coiling end of three phase windings of the brshless DC motor welds together.
3. brshless DC motor water pump as claimed in claim 1, it is characterised in that the multiple unit control circuit also included
Thermal protection circuit, after the temperature of main control chip exceedes the temperature of setting, the three-phase for cutting off brshless DC motor is exported.
4. brshless DC motor water pump as claimed in claim 1, it is characterised in that the multiple unit control circuit also includes electricity
Machine magnetic field position detects circuit, and the counter electromotive force for detecting motor three-phase windings is converted according to counter electromotive force, obtains electricity
Magnetic field position signal during the correct commutation of machine winding, and be sent to sine waveform and occur circuit.
5. brshless DC motor water pump as claimed in claim 1, it is characterised in that also including housing, brshless DC motor and institute
Drive circuit is stated to be encapsulated in the housing, and drive circuit is arranged in a driving plate；
The rotary shaft of the brshless DC motor stretches out hull outside；The impeller of pump fixed with the hull outside rotary shaft；With
The water outlet lid that the housing is fixed and covered on the impeller of pump；The hull outside is provided with U-shaped buckle；The housing bag
Pump housing upper casing and pump housing lower casing are included, pump housing upper casing and pump housing lower casing offer multiple connecting holes in correspondence position respectively, to lead to
Holding screw is crossed to be fixedly connected with pump housing upper casing with pump housing lower casing；It is located in the brshless DC motor rotary shaft in pump housing upper casing
Place one retaining ring of suit of side；Water outlet mouth sealing ring is provided between the impeller of pump and water outlet lid.
6. brshless DC motor water pump as claimed in claim 5, it is characterised in that set in the pump housing upper casing and water outlet lid
There is the buckle of mutual cooperation, to be fixedly connected with pump housing upper casing and water outlet lid.
7. brshless DC motor water pump as claimed in claim 5, it is characterised in that installation foot pad is fixed with the outside of pump housing lower casing
And shock-absorbing foot pad.
8. brshless DC motor water pump as claimed in claim 5, it is characterised in that brshless DC motor includes the electricity assembled successively
Generator terminal lid, Graphite pad, rubber seal, rotor assembly, oiliness bearing component, plastic packaging stator component；Wherein, the oil-containing axle
The bearing block lower end of bearing assembly is placed in stator module internal cavities, and the rotor assembly is sleeved on containing for oiliness bearing component
On oil bearing, the Graphite pad is bonded in the shrinkage pool of electric motor end cap, and the rubber seal is arranged on plastic packaging stator component
On the step in outside, the electric motor end cap is pressed on the step of plastic packaging stator component to be pressed in middle and fixes rubber seal.
9. brshless DC motor water pump as claimed in claim 8, it is characterised in that the plastic packaging stator component includes being arranged on modeling
Expect that cavity rounded inside multiple stator cores on skeleton, the plastic skeleton is used to install oiliness bearing component；Coiling
Coil outside the stator core；The plastic skeleton is fixed in driving plate, and the outlet of the coil is welded on described
It is connected in driving plate and with power line；Tension disc is installed in the driving plate, for compressing power line；The multiple stator iron
The heart and plastic skeleton form plastic packaging stator component by plastic packaging in driving plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410784937.2A CN104734578B (en) | 2013-12-18 | 2014-12-17 | A kind of brshless DC motor water pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310697504.9A CN103867455A (en) | 2013-12-18 | 2013-12-18 | Brushless direct-current motor for condensed-water discharging pump of fan coil of ceiling type air conditioner and water pump body |
| CN2013106975049 | 2013-12-18 | ||
| CN201410784937.2A CN104734578B (en) | 2013-12-18 | 2014-12-17 | A kind of brshless DC motor water pump |
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| CN104734578A CN104734578A (en) | 2015-06-24 |
| CN104734578B true CN104734578B (en) | 2017-08-04 |
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| CN201310697504.9A Pending CN103867455A (en) | 2013-12-18 | 2013-12-18 | Brushless direct-current motor for condensed-water discharging pump of fan coil of ceiling type air conditioner and water pump body |
| CN201410784937.2A Active CN104734578B (en) | 2013-12-18 | 2014-12-17 | A kind of brshless DC motor water pump |
| CN201420807237.6U Active CN204371699U (en) | 2013-12-18 | 2014-12-17 | A kind of brshless DC motor water pump |
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| CN201310697504.9A Pending CN103867455A (en) | 2013-12-18 | 2013-12-18 | Brushless direct-current motor for condensed-water discharging pump of fan coil of ceiling type air conditioner and water pump body |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420807237.6U Active CN204371699U (en) | 2013-12-18 | 2014-12-17 | A kind of brshless DC motor water pump |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105915124B (en) * | 2016-06-08 | 2019-11-19 | 汉宇集团股份有限公司 | The centrifugal pump of U-iron core single-phase permanent-magnet synchronous motor driving |
| CN106224258B (en) * | 2016-09-30 | 2018-05-25 | 克奥兹泵业（深圳）有限公司 | Automatic speed regulation energy-saving centrifugal water pump |
| JP2018091190A (en) * | 2016-12-01 | 2018-06-14 | 株式会社鷺宮製作所 | Drain pump and air conditioner |
| CN108880352B (en) * | 2018-08-01 | 2020-10-30 | 浙江东方机电有限公司 | Counter electromotive force balance adjusting device and method for permanent magnet synchronous motor |
| CN114448295A (en) * | 2022-01-07 | 2022-05-06 | 江阴市博今环保设备有限公司 | Control method of direct-current brushless motor for water pump |
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| CN2671197Y (en) * | 2003-11-14 | 2005-01-12 | 鼎沛股份有限公司 | D.C. motor protective circuit |
| CN201332347Y (en) * | 2008-11-27 | 2009-10-21 | 郑云峰 | Brushless motor water pump |
| CN202856673U (en) * | 2012-09-17 | 2013-04-03 | 西华大学 | Brushless direct current motor rotating speed control system for intelligent water pump based on INGA |
| CN104009682A (en) * | 2014-06-09 | 2014-08-27 | 浙江理工大学 | Brushless DC motor controller and control method |
| CN204408228U (en) * | 2014-12-17 | 2015-06-17 | 南京沃特电机有限公司 | A kind of brshless DC motor water pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3114866B2 (en) * | 1998-08-26 | 2000-12-04 | 株式会社日立製作所 | Motor speed control device |
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2013
- 2013-12-18 CN CN201310697504.9A patent/CN103867455A/en active Pending
-
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- 2014-12-17 CN CN201410784937.2A patent/CN104734578B/en active Active
- 2014-12-17 CN CN201420807237.6U patent/CN204371699U/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2671197Y (en) * | 2003-11-14 | 2005-01-12 | 鼎沛股份有限公司 | D.C. motor protective circuit |
| CN201332347Y (en) * | 2008-11-27 | 2009-10-21 | 郑云峰 | Brushless motor water pump |
| CN202856673U (en) * | 2012-09-17 | 2013-04-03 | 西华大学 | Brushless direct current motor rotating speed control system for intelligent water pump based on INGA |
| CN104009682A (en) * | 2014-06-09 | 2014-08-27 | 浙江理工大学 | Brushless DC motor controller and control method |
| CN204408228U (en) * | 2014-12-17 | 2015-06-17 | 南京沃特电机有限公司 | A kind of brshless DC motor water pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104734578A (en) | 2015-06-24 |
| CN204371699U (en) | 2015-06-03 |
| CN103867455A (en) | 2014-06-18 |
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Address after: 211200 Yihu Road, Lishui Economic Development Zone, Nanjing City, Jiangsu Province Co-patentee after: Sun Wangsheng Patentee after: NANJING WATT ELECTRIC Co.,Ltd. Address before: 211200 3 building, Pioneer Park, Yong Yang Town, Lishui District, Nanjing, Jiangsu Co-patentee before: Sun Wangsheng Patentee before: NANJING WATT ELECTRIC Co.,Ltd. |