CN1105887C - Drive for outdoor draft fan - Google Patents
Drive for outdoor draft fan Download PDFInfo
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- CN1105887C CN1105887C CN96103467A CN96103467A CN1105887C CN 1105887 C CN1105887 C CN 1105887C CN 96103467 A CN96103467 A CN 96103467A CN 96103467 A CN96103467 A CN 96103467A CN 1105887 C CN1105887 C CN 1105887C
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- brushless motor
- control
- signal
- mentioned
- fan
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- 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
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- 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
- F05D2260/00—Function
- F05D2260/85—Starting
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention relates to a drive for outdoor draft fan. The start control function of an outdoor fan has a deciding function for detecting the rotating direction and rotating speed of a brushless motor and a reverse stop function for stopping the rotation of the brushless motor when the rotating speed before starting is not higher than a preset specified value and the rotating direction is reverse. When a setting mode set meeting a normal rotation and a reverse rotation is not detected after the normal rotation or the reverse rotation of the brushless motor is detected from the change of the combination mode of the detected signal of a position detecting means, the abnormality of the position detecting means is decided, and the driving of an outdoor blower is stopped. As a result, even when the state of the outdoor fan changes depending on the difference in wind direction and wind velocity, the outdoor fan can be readily started.
Description
The present invention relates to drive the drive for outdoor draft fan of using brushless motor by a plurality of switching device speed control of bridge joint outdoor draft fan.
Present air conditioner adopts the brushless motor of difference drive compression machine and outdoor draft fan, three-phase brushless motor is the dc motor that a kind of U of having, V, W three phase windings and the drive circuit of using a plurality of switching devices of bridge joint drive control, especially requires the variable-ratio utilization.
When this brushless motor being carried out speed control, the switching device of underarm either party on the gapping switch device drive circuit is connected in control, connects the switching device that disconnects control the opposing party according to PWM (pulse width modulation) signal.At this moment, might start outdoor sending in the machine rotation because of wind.Therefore, by only giving the big voltage of an addition certain hour, when brushless motor was stopped, the pwm signal according to predetermined on-state (on duty) ratio began break-make control again during starting.
On the other hand, in the speed control after the starting, because of can causing speed, high wind descends sometimes.At this moment,, increase the on-state ratio of switching device,, will inevitably increase electric current to obtain predetermined speed if according to feedback speed signal.Therefore,, make its value of detecting be no more than preset value, prevent to damage switching device with this by the electric current of flowing through in the sense switch device.
The air conditioner of above-mentioned prior art, during starting by after brushless motor being stopped only for a big voltage that applies certain hour mutually, pwm signal according to predetermined on-state ratio carries out break-make control, is difficult to stop fully because of wind speed or wind direction relation sometimes in this way, is difficult to starting.
Use current transformer (CT) etc. have, owing to as the device of the electric current of sense switch device, unavoidably can cause control device to maximize again.
In addition, these problems are not limited to be present in the air conditioner, in the drive unit of general outdoor draft fan, also have this class common issue with.
The present invention is in order to address the above problem, and its first purpose is, even provide a kind of when starting under wind speed or the various different situations of wind direction, and the also drive for outdoor draft fan that can reliably start.
The present invention's second purpose is, provides a kind of and can realize the drive for outdoor draft fan of control device miniaturization thus without sensors such as CT.
First invention, owing to have: the brushless motor prestart detects the discriminating gear of brushless motor direction of rotation and rotary speed according to the output signal of position detecting device; When detected prestart rotary speed is reversed in the following direction of rotation of predetermined setting, make switching device the driving signal powered-on mode with from the consistent energising again of the integrated mode of the detection signal of position detecting device, the reverse arresting stop that the rotation of brushless motor is stopped, even so when starting the backing of wind, also can stop the back starting reliably.
In second invention, reverse arresting stop because be to increase gradually to revise the on-state ratio that drives signal, so can make it in short time reliably to stop.
In the 3rd invention, reverse arresting stop, because during the motor in stopping to reverse, can store the on-state ratio of the driving signal when stopping, and begin starting control to positive veer with the driving signal of this on-state ratio, control transition successfully so can make the pressure fan of reverse stop the back to the starting of positive veer, improve the starting rising edge.
In the 4th invention, discriminating gear, because after from the variation of the integrated mode of position detecting device detection signal, detecting brushless motor and just changeing or reverse, if do not detect and just changeing or when reversing the preassigned pattern of setting accordingly, then differentiating is the unusual of position detecting device, end the driving of outdoor draft fan, so can when differentiation is just being changeed reverse, differentiate the unusual of position detecting device.
The 5th invention, has the break-make control device, this device is at either party's switching device of connecting underarm in the control, and the time according to pwm signal break-make control the opposing party switching device, poor when according to corresponding to rotary speed instruction and rotary speed detected value, when making on-state carry out break-make control than different pwm signals, when in case the on-state of pwm signal ratio instructs first limits value that reaches predetermined corresponding to the brushless motor rotary speed, just ignore the rotary speed instruction of brushless motor, and carry out break-make control according to pwm signal corresponding to lower rotary speed instruction; In the 6th invention, even have the control of ignoring the rotary speed instruction, in the on-state of pwm signal when arriving than big predetermined second limits value of above-mentioned first limits value, so the also arresting stop that above-mentioned brushless motor is stopped is can prevent to start because of outdoor draft fan the time and the continuous overcurrent that external interference causes in the running motor of flowing through.
Have again, without sensors such as CT, so can realize the miniaturization of control device.
In the 7th invention, detect the swing circle of brushless motor according to the output signal of position detecting device, meanwhile, when detected swing circle is following than the low certain value of instruction swing circle of drive unit, make it to stop the break-make control of brushless motor, can prevent that therefore external disturbance in the running continuously from causing the flow through phenomenon of motor of overcurrent.Have, actual swing circle utilizes natural wind to make pressure fan be in rotation status in short-term in the running again, so can conservation of power.
Below, with reference to the accompanying drawings shown in preferred embodiment describe the present invention in detail.
Fig. 1 is for being used to illustrate one embodiment of the invention action, the flow chart of the concrete handling procedure of expression main composition key element;
Fig. 2 is for being used to illustrate one embodiment of the invention action, the flow chart of the concrete handling procedure of expression main composition key element;
Fig. 3 is for being used to illustrate one embodiment of the invention action, the figure of the output waveform of expression main composition key element;
Fig. 4 is for being used to illustrate one embodiment of the invention action, the flow chart of the concrete handling procedure of expression main composition key element;
Fig. 5 is for being used to illustrate one embodiment of the invention action, the powered-on mode figure that rotates a circle for outdoor fan;
Fig. 6 is for being used to illustrate one embodiment of the invention action, the on-state ratio of expression pwm signal and the graph of relation of rotary speed instruction;
Fig. 7 is for being used to illustrate one embodiment of the invention action, the on-state ratio of expression pwm signal and the chart that concerns of rotary speed instruction;
Fig. 8 is for being used to illustrate one embodiment of the invention action, the flow chart of the concrete handling procedure of expression main composition key element;
Fig. 9 is the block diagram of the simple structure of expression one embodiment of the invention;
Figure 10 is the detailed structure circuit diagram of drive circuit in expression one embodiment of the invention;
Figure 11 is for being used for one embodiment of the invention action specification, the oscillogram of expression main composition key element on off operating mode;
Figure 12 is for being used for one embodiment of the invention action specification, the chart of expression main composition key element on off operating mode;
Figure 13 is for being used to illustrate one embodiment of the invention action, the flow chart of the concrete handling procedure of expression main composition key element.
Fig. 9 is as one embodiment of the invention, shows the simple structure of the indoor and outdoor split type air conditioner that comprises outdoor draft fan (below, pressure fan is called fan).In the drawings, 1 for carrying out the compressor of speed control by not shown power converter, it constitutes well-known refrigerant cycles with cross valve 2, outdoor heat converter 3, outdoor fan 4, expansion valve 5, indoor heat converter 6, indoor fan 7 and by-passing valve 8.It is corresponding with the cold air operation pattern, and by-passing valve 8 is closed in the cold air operation pattern.In the heating installation operation mode, cross valve 2 switches to illustrated opposition side.Can frosting on the outdoor heat converter 3 in this heating installation pattern.By-passing valve 8 is opened during frosting, with the input side of high temperature refrigerant supply chamber outer heat-exchanger 3.
The key element that constitutes this refrigerant cycles is divided into indoor unit 10 and outdoor unit 30 installations.Indoor unit 10 is made of remote control 11 and indoor set main body 20.Remote control 11 is handled the signal by the operating portion 12 of user's proper handling by its microcomputer (simplify among the figure and be labeled as " microcomputer ") 16, by transtation mission circuit 17, will send to indoor set main body 20 as infrared signal.Operating portion 12 also comprises changes in temperature change-over switch 13, temperature setting switch 14, air quantity change-over switch 15 etc.
Above-mentioned indoor heat converter 6 and indoor electric fan (fan) 7 are installed in the indoor set main body 20.Have again, in the indoor set main body 20, by the temperature sensor 22 that detects room temperature, the output signal that detects the indoor test section 21 that the humidity sensor 23 etc. of indoor humidity constitutes adds to MCU (multiple control module) 25.Have again, the signal that receiving circuit 24 receives from remote control 11, the output signal that detects the heat exchange temperature sensor 29 of indoor heat converter 6 temperature also adds to MCU25.MCU25 is according to these signals, be commonly referred to as PMV (predicted Mean Vote) the comfort level computing, set the computing of room temperature correction value, and the computing of the compressor driving motor rotary speed of determining by these operation results etc.MCU25 sends operation mode signal and the instruction of compressor rotary speed to outdoor unit 30 by serial transfer circuit 26, simultaneously on display part 27, show operating condition, and then, will add to indoor fan drive circuit 28 with the corresponding control signal of air quantity, drive chamber's internal fan 7.
In the outdoor unit 30, the compressor 1, cross valve 2, outdoor heat converter 3, outdoor fan 4 and the expansion valve 5 that form refrigerant cycles are housed.The signal that indoor set main body 20 is sent into is received by serial received circuit 31, adds to MCU32.MCU32 also receives the signal of the temperature sensor 31 of sensing chamber's outer heat-exchanger 3 temperature, by drive circuit 33 drive compression machines 1, in the time of cross valve 2 and by-passing valve 8, directly controls expansion valve 5.
About the action of existing aircondition, as setting signal being sent to indoor set main body 20 aspects by remote control 11; The MCU25 of indoor set main body 20 is according to the rotary speed of various sensor signal computing compressors 1 and the rotary speed aspect of outdoor fan 4; The MCU32 control compressor 1 and the cross valve 2 of outdoor unit 30 are opened aspects such as by-passing valve 8 during frosting, existing various schemes are announced, omit its explanation here.The directly control of relevant outdoor fan with the present invention will be described in detail below.
Figure 10 has represented the structure of outdoor fan 4 drive circuits in detail.Among the figure, 50 is the three-phase brushless motor of drive chamber's external fan 4, and having provides the drive circuit 44 of alternating voltage to three phase winding U, V, W.This driving power control circuit 44, the inverter circuit that constitutes by 3 FET of epimere (U, V, W) (upper arm) that 6 power MOSFETs (below be called FET) bridge joint is constituted and 3 FET of hypomere (X, Y, Z) (underarm), make this inverter circuit FET (U～Z) switching (below, represent to lead to ON, OFF represents to break) drive circuit P1～P6, and the capacitor C1-C3 that constitutes upper arm drive circuit power supply combines.
And, comprise not shown compressor driving motor, also have and drive the power circuit 41 that these motor are used.This power circuit 41 is made of the smoothing circuit 43 that the interchange of commercial ac power source 40 is carried out the rectification circuit 42 of rectification, smoothly this rectification circuit 42 rectifications output.DC voltage anode output in that smoothing circuit 43 obtains by constituting the FET (U-W) of upper arm in the drive circuit 44, is supplied to three phase winding U, V, the W of brushless motor 50.The negative terminal output of the DC voltage that obtains at smoothing circuit 43 by constituting the FET (X-Z) of underarm in the drive circuit 44, is supplied to three phase winding U, V, the W of brushless motor 50.
Be connected to switching regulaor (switching regulator) 45 from the direct current output branch of smoothing circuit 43 outputs.Switching regulaor 45, constitute by control elements such as transistor (present embodiment describes with transistor) 46, the secondary transformer 47 that 6 windings are arranged, half-wave rectifying circuit (diode) 48a-48f and smoothing circuit (electrochemical capacitor) 49a-49f that are connected between each secondary terminal, by controlling, make DC voltage become the galvanic current potential source from smoothing circuit 49a-49f by the transistor 46 that hereinafter MCU that narrates is produced.
In this galvanic current potential source, 5 control circuits of supplying with not shown compressor driving motor on accompanying drawing top, a remaining grid as the underarm FET (X-Z) of drive circuit 44 drives with power supply (hypomere side power supply), is supplied in this drive circuit 44.
The photo-coupler of underarm side (drive circuit) P
4-P
6Be connected in parallel in the direct voltage source (hypomere side power supply) that obtains by the half-wave rectifying circuit 48f that is connected with 47 level windings of transformer and smoothing circuit 49f respectively.And then, tell lead-in wire, diode D from the anode output in this VD source
1, D
2, D
3Each positive pole, be connected with the output of this separated time by resistance r.These diodes D
1, D
2, D
3Each negative pole respectively with electrochemical capacitor C
1, C
2, C
3Positive terminal be connected.
On the other hand, be connected with position detecting circuit 52 on the MCU32, the present position of logical and disconnected six assembled state (call " integrated mode ") of this testing circuit 52 by measuring the output signal that is located at three Hall elements 51 that U, V, W go up mutually respectively in the brushless motor 50, the position of detection rotor also can add to MCU32 to detection signal when rotor stops.
MCU32, carry out turn of tidal stream control according to position detection signal by position detecting circuit 52 detected brushless motor 50 rotor-positions, be brushless motor 50 switching of switching on, simultaneously, detect actual rotary speed from position detection signal, poor according to and instruction speed adjusted the PWM control of pulsewidth (pulse width).That is, as shown in figure 11, MCU32 change ON time (pulsewidth in the PWM control) of FET (U, V, W) and ON (turn of tidal stream) regularly and the ON (turn of tidal stream) of FET (X, Y, Z) regularly, to the intact coupler P of driving power control circuit 44
1-P
6Transmit control signal G
1-G
6, this control signal G
1-G
6Purpose be that electric current is flowed in this brushless motor 50 each winding U-W, allow brushless motor 50 rotate to predetermined direction at a predetermined velocity.At this moment, photo-coupler P
1-P
6, according to the control signal G that sends respectively
1-G
6Grid output is additional to each FET (U-Z), to above-mentioned FET (U-Z) regularly with above-mentioned ON time, ON, carry out the ON/OFF operation, can change the size and Orientation that is additional to the average voltage in brushless motor 50 3 phase winding U, V, the W thus, the electric current of predetermined size and Orientation is circulated in winding, brushless motor 50 is carried out variable-ratio control.
At brushless motor 50 prestarts, MCU32 is with control signal G '
4-G '
6Send the photo-coupler P of each FET of underarm (X-Z) drive circuit to
4-P
6, by above-mentioned P
4-P
6FET (X-Z) is connected in turn on schedule.
Here, the method for supplying with driving power to the FET in the drive circuit 44 (U-W) is described.
When starting air-conditioner operation, one connects commercial ac power source 40, and by the rectification circuit 42 of power circuit 41, smoothing circuit 43 and switching regulaor 45, DC voltage just are transported to the photo-coupler P of the FET (X-Z) of drive circuit 44 underarms
4-P
6At this moment, for photo-coupler P to upper arm FET (U-W)
1-P
3Supply with DC voltage, electric charge must be supplied with electrochemical capacitor C
1-C
3But, in initial state, the electrochemical capacitor C of epimere side power supply
1-C
3Electric charge is still uncharged, photo-coupler P
1-P
3There is not DC voltage to supply with yet.For electric charge being supplied with electrochemical capacitor C
1-C
3, the negative pole current potential of the electrochemical capacitor of the smoothing circuit 49f of formation hypomere side power supply and each electrochemical capacitor C of epimere side power supply
1-C
3Negative pole current potential etc. must be identical.That is to say, if connect each FET (X-Z) of underarm, then the electrochemical capacitor C of each FET (U-W) of the negative pole of the electrochemical capacitor of smoothing circuit 49f and upper arm
1-C
3Negative pole will be communicated with, satisfy above-mentioned condition.
Like this, brushless motor 50 prestarts are worked as control signal G ' through MCU32
4-G '
6Be transmitted to photo-coupler P
4-P
6, when input drive signal on the gate terminal of each FET (X-W) of underarm, this FET (X-W) are connected (ON) simultaneously, the capacitor C of each FET (U-W) of upper arm then
1-C
3Just by the level and smooth dc source charging of smoothing circuit 49f, in each capacitor C
1-C
3On, produce the roughly the same terminal voltage of electrochemical capacitor terminal voltage with smoothing circuit 49f.
Like this, because the capacitor C of each FET (U-W) of upper arm
1-C
3So upwards charging is capacitor C
1-C
3Output is fed to each photo-coupler P as power drives
1-P
3That is just can carry out variable-ratio control to this brushless motor 50 reliably during, from brushless motor 50 startings.
But, continue rotation in order to make brushless motor 50, charging current must flow into upper arm FET (U-W), capacitor C successively
1-C
3Must charging.Yet, according to Figure 10 structure, as mentioned above, in initial state, after connecting (ON) and driving the FET (X-Z) of underarm,, finish after the charging with this by of the capacitor energising of smoothing circuit 49f out-put supply to upper arm, the ON/OFF (on/off) of the FET (U-W) of the upper arm that causes according to the reversible rotation of following brushless motor 50/variable-ratio control and the FET (X-Z) of underarm drives, and becomes the capacitor C of FET (U-W) the drive circuit power supply of upper arm
1-C
3Can automatically be recharged.
After brushless motor 50 startings, because the control signal G of MCU32
1-G
3The FET of upper arm (U-W), pulse width (according to speed feedback) and turn of tidal stream timing (according to the rotor-position feedback) according to PWM control are switched on and close (ON, OFF) successively, meanwhile, the FET of underarm (X-Z) according to turn of tidal stream timing (timing), is switched on (ON) so successively, brushless motor 50 just can drive rotation, and can be controlled by the pulse width that changes break-and-make switch.
The ON/OFF state table diagrammatic sketch of each FET (U-Z) when Figure 12 carries out the control of above-mentioned variable-ratio.Among the figure, the OFF state of the pwm signal the when state of the pwm signal when PWM-ON represents that FET carries out break-and-make switch with predetermined pulse width, PWM-OFF represent that FET carries out break-and-make switch.In order to switch to each powered-on mode (0-5) among Figure 12 in turn, when can control the ON/OFF driving of each FET (U-Z) by MCU32, increase and decrease on-state (onduty) ratio, control sense of current and size in inflow brushless motor 50 each winding with this, and carry out above-mentioned variable-ratio control.
Here, for example, be set in 50 energisings of " pattern 5 " state brushless motor, because FET (U) (the placing PWM) ON of upper arm drives, the FET of underarm (Z) places ON to drive, be dependent on the drive current of the DC voltage that obtains through rectification circuit 42, smoothing circuit 43, be supplied to brushless motor 50 by FET (U), FET (Z).On the other hand because underarm FET (Z) places ON, for the identical reason of above-mentioned brushless motor 50 prestarts charging, first charging current that is discharged by smoothing circuit 49f electrochemical capacitor is through resistance r, diode D
3, make the capacitor C of the FET (W) of upper arm
3Charging.
Then, when FET (U) carries out the transition to (PWM) OFF state, because at flying wheel (fly wheel) the diode F that is in the underarm FET (X) of this FET (U) relative status
4And be between the FET (Z) of ON state and form closed-loop, in this closed-loop, have the loop current circulation.
Yet, because flying wheel diode F
4Set is in ON, the current potential of the negative pole of the electrochemical capacitor of smoothing circuit 49f and capacitor C
1The current potential of negative pole become identical, new charging current through resistance r, diode D
1, make capacitor C
1Charging.In addition, because FET (Z) is in the ON state, so the capacitor C of FET (W)
3In also have charging current circulation.
In other each powered-on mode (0-4) too, corresponding with this pattern shown in Figure 12, corresponding to each capacitor C of (U-W) mutually of FET
1-C
3, equally by charging current for charging.Like this, because the capacitor C of each FET (U-W) of upper arm
1-C
3Electric charge is recharged, so by above-mentioned capacitor C
1-C
3Drive output and be fed to each photo-coupler P
1-P
3
Promptly, when switching by energising, during brushless motor 50 runnings, follow each FET (X-Z) of underarm to do that ON drives and (PWM) ON of the FET (U-W) of upper arm to (PWM) OFF transition, charging current will flow into the FET (U-W) of above-mentioned upper arm, so can be to each FET (U-W) (capacitor C of upper arm
1-C
3) charging generation driving output.
More than, to containing the air conditioner structure of outdoor fan, and the detailed structure of outdoor fan drive circuit and action be described, in the present embodiment, and the outdoor fan starting control function that MPU32 has been possessed tackle exogenous wind, the Current Control function after starting.
Wherein, outdoor fan starting control function comprises: detect the direction of rotation of brushless motor and the discrimination function of rotary speed; The reverse hold function that the prestart rotary speed stops the rotation brushless motor when the following direction of rotation of the value of predesignating reverses; Increase the correcting device of revising the on-state ratio that drives signal gradually; The driving signal of the on-state ratio when stopping to begin the start-up function to positive veer starting control; After detecting above-mentioned brushless motor and just changeing or reverse according to the variation of the detection signal integrated mode of position detecting device, detect less than with just change and when reversing the setting pattern of corresponding setting, differentiate the function that drives for position detecting device abort outdoor draft fan.
That is to say, detect wind speed by the outdoor fan rotary speed respectively at prestart, detect wind direction by the outdoor fan direction of rotation, judge whether can start control according to testing result, simultaneously in the time can starting, setting with just change, reverse, stop corresponding operation mode and correction on-state ratio, reaching predefined reference speed step transition to the control of normal speed.
In general, when the prestart outdoor fan stops, bringing any obstacle can for starting control, by giving photo-coupler P shown in Figure 10
4-P
6Transmit control signal G '
4-G '
6Give capacitor C
1-C
3Charging just can be started, and just can start control by predetermined pwm signal subsequently.Have again, just changeing and rotary speed when quite big, there is no need drive chamber's external fan because outdoor heat converter be we can say by the natural wind cooling at the prestart outdoor fan.Therefore, there is no need to send the control signal G ' that it can be started this moment
4-G '
6Yet,, be necessary to carry out the starting control of speedup gradually even just changeing but its speed when low.On the other hand, when its rotary speed is quite big even the prestart outdoor fan reverses, rely on the natural wind outdoor heat converter also can fully cool off, so also there is no need drive chamber's external fan.Yet, reverse but speed when low, be necessary that reduction of speed stops it gradually, under halted state, start control to positive veer.
Fig. 1 and Fig. 2 show the flow chart of concrete handling procedure of the above-mentioned discrimination function of relevant judgement wind speed and direction.Below, according to this flow chart, refer again to Fig. 3, this acts of determination is described.
Now, shown in Fig. 3 (a), respectively to FET (U-W) that constitutes upper arm shown in Figure 10 and the FET (X-Z) that constitutes underarm, implement PWM control and turn of tidal stream control, drive brushless motor 50, in this case, be located at the three-phase alternating current position detection signal shown in Hall element 51 output maps 3 (b) in the brushless motor 50, corresponding, the logic level signal shown in position detecting circuit 52 output maps 3 (c) adds to MCU32.MCU32 determines wind speed and wind direction according to logic level signal shown in Fig. 3 (c), is condition with the same result of determination of double acquisition, so that improve precision.
For this reason, at first will calculate the counter A that number of times is judged in the fan rotation in step 101, calculating stops to judge the counter B of number of times, calculating is just changeing the counter C that judges number of times, calculates each value that reverses counter D that judges number of times and the counter E that calculates Hall element 51 abnormality juding number of times and resets in zero.Then, in step 102, set the U inlet of the U phase signals of receiving position testing circuit 52 for the signal input state, the V phase signals of receiving position testing circuit 52 and the V of W phase signals inlet and W inlet are set the signal output state for, in fact be exactly to be fixed into the L level, make signal can not import V inlet and W inlet.Then, step 103 below judges whether from the U phase signals of U inlet input be the H level.That is, judge whether rotor is in a certain position of pattern 0,1,2.In step 103, judge that the U phase signals is the moment of H level, if, following the L level signal in rotation, fan will be input to the U inlet.In step 104, set L for then,, detect the U phase signals and whether become the L level, promptly detect the U phase signals becomes the L level from the H level edge (edge) (rising edge of signal or trailing edge) then in step 105 with detecting a reference value that becomes the L level.
When detecting the edge of U phase signals, the value of calculating the counter A of rotation judgement number of times in step 106 only adds 1, in step 107, judges that this count value is 1 or 2.At this moment, if the value of counter A is 1, then carry out the processing of step 108, that is, carry out the integrating operation by counter, the value of measuring counter A is by 1 time that becomes till 2.Then in step 109, the V phase signals of input position testing circuit 52 and the V inlet and the W inlet of W phase signals are switched to the signal input state, check U phase, V phase, W each signal level mutually, in step 110, judge whether U phase, V phase, each signal level of W phase become L, H, L, that is judge whether the U phase signals during from the H level transitions to the L level, is must detected integrated mode 3 in just changeing.If mode 3 in step 111, is judged fan for just changeing, then in step 112, only increase by 1 with calculating the value of just changeing the counter C that judges number of times, in step 113, judge whether this count value becomes 2.At this moment, because Counter Value is 1, so can be moved to the processing of step 134, at this moment, again after counter B, D, E being reset to 0, get back to the processing of step 102, set the U inlet for the signal input state here, and after setting V inlet and W inlet for the signal output state, the processing of implementation step 103.Because the U phase signals becomes the L level after the H level, so move to the processing of step 204 shown in Figure 2 from step 103.The processing of step 204-232 shown in Fig. 2 flow chart, processing corresponding to step 104-132, its difference only is, in step 104 is to set next decision level for L, substitutes therewith, item sets next decision level for H in step 204, take a decision as to whether the L level in step 105, substitute therewith, take a decision as to whether the H level in step 205, in step 110, take a decision as to whether mode 3, substitute therewith, take a decision as to whether pattern 0 in step 210, and then, take a decision as to whether pattern 5 in step 123, substitute therewith, take a decision as to whether pattern 2 in step 223, the processing of step 200 code name in addition is identical with the processing of relative step 100 code name.
Yet, in step 204 a reference value that detects the H level is set for H, detect the U phase signals in step 205 and whether become the H level, promptly detect the U phase signals becomes the H level from the L level edge.
When detecting the edge of U phase signals, the value that will calculate the counter A of rotation judgement number of times in step 206 only increases by 1, judges that in step 207 this count value is 1 or 2.At this moment,, then measure the counting operation of the counter of usefulness in step 222 dwell time if the value of counter A is 2, and the count value during according to this, i.e. the time of U phase signals from trailing edge to rising edge, calculate fan revolution speed.Then, in step 209 the V phase signals of receiving position testing circuit 52 and the V inlet and the W inlet of W phase signals are switched to the signal input state, and check each signal level of U phase, V phase, W phase, judge in step 210 whether U, V, each phase signals level of W become H, L, H, promptly take a decision as to whether pattern 0, at this moment, if pattern 0, then judge that in step 211 fan is for just changeing, then will calculate the value of just changeing the counter C that judges number of times in step 212 only increases by 1, judges in step 113 whether this count value becomes 2.At this moment, because the value of counter C is 2, can be moved to the processing of step 214.
Judge that in step 214 fan revolution speed that calculates in step 222 is whether more than setting, if more than setting, because under this state, utilize natural wind to be enough to cool off, so set step 215 beginning drive compression machine, can not drive fan with step 216, therefore needn't carry out the processing supplied with to the driving power of FET (U-W) to drive circuit 44, get back to step 101.
On the other hand, in step 214, fan revolution speed is than setting hour, control in the starting that step 231 is implemented hereinafter will describe in detail, when fan revolution speed surpasses setting, implement on record speed control in step 232 according to speed feedback, and end process.
Like this, double when obtaining same result of determination, determine the fan rotation, wind is promptly arranged, fan just changes, and promptly with the wind, and can detect fan revolution speed this moment.
But, when calm, even the signal level that has detected the U phase in step 103 is H, because of this state (halted state) is still continuing, so can detect less than the L level in step 105.At this moment,, after step 118 is confirmed to have spent the scheduled time, carry out fan in step 119 and stop to judge, stop to judge that in step 120 pair calculating the count value of the counter B of number of times only increases by 1 again at step 117 starting timer (timer) beginning minute.And judge in step 121 whether this calculated value becomes 2.At this moment, if the value of calculator B is 1, then move to the processing of step 133, here, again after counter C, D, E being reset to 0, the processing of the processing of implementation step 102-105 and step 117-121 when calculating stops to judge that the count value of the counter B of number of times becomes 2, moves to the starting control of step 131.
Continuous like this when obtaining same result of determination for 2 times, the detection fan is a halted state.
On the other hand, supposing that be not mode 3 in above-mentioned steps 110 is handled, then might be that fan reverses, and perhaps position detecting circuit 52 is undesired.At this moment, judge in step 123 whether the signal level of U, V, each phase of W is L, L, H, judge promptly whether the integrated mode that the U phase signals must be detected when the H level moves to the L level in reversing is 5, is judged to be reverse in step 124 during pattern 5.And, make the value of counter D only increase by 1, and judge that in step 126 this count value is 1 or 2 so that carry out once this judgement again.At this moment, because the value of counter D is 1,, move to the later processing of step 102 again so counter D, C, E beyond this counter are reset to 0 in step 135.
Under above-mentioned state,, carrying out after step 103 handles, handling being judged to be when reversing once more through step 204-210, step 223-226, then carrying out the later processing of step 214 because U phase signals level is L.
Double like this when obtaining same result of determination, being defined as fan just changes, and carries out the processing corresponding to fan revolution speed this moment.
In addition, suppose in step 223 it is not pattern 2, then decidable is that Hall element 51 or position detecting circuit 52 are unusual, makes the value of counter E only increase by 1, so that carry out once this judgement again, and judges that in step 229 this count value is 1 or 2.At this moment, because the value of counter E is 1,, move to the later processing of step 102 again so counter B, C, D are reset to 0 in step 136.At this moment, after the processing of having carried out step 103, be judged to be once more unusually through the processing of step 204-210, step 223, step 227-229, be defined as Hall element 51 or position detecting circuit 52 for unusual in step 230, and stop the following processing of this step.
Double like this when obtaining same result of determination, be judged to be Hall element 51 or position detecting circuit 52 for unusual, and end the driving of outdoor draft fan.
More than, the situation that the signal level of the U phase of input MCU32U inlet is initially the H level is illustrated, be initially the situation of L level for U phase signals level, as the later processing of step 103, can be after the processing of carrying out step 200 code name, by implementation step number is the processing of 100 code names, carries out and the identical judgement of above-mentioned judgement.
As mentioned above, the state of prestarting outdoor fan judgement think just change or reverse and rotary speed below setting, when perhaps stopping, the start up process in the execution in step 131 then.
Fig. 4 is the flow chart of expression step 131 detailed process degree.Here, at first judge to stop, just changeing, or reverse, just change or when stopping, being judged to be in step 308, with the pattern energising of the present present position of rotor in initial step 301.Fig. 5 represents the powered-on mode that brushless motor rotates a circle.For example the present position is a Mode A
0The time, move to following A
1=A
0During+1 pattern, in order not postpone the instantaneous A of giving in control ground
1The pattern energising will be in step 309 with Mode A
0+ 1 places the register of MCU, judges whether moved to Mode A in step 310
1The position.And, move to Mode A
1The position, one obtains confirming, just in step 311 with A
1The pattern energising.Then judge the outdoor fan rotary speed whether more than setting, and the processing of carrying out step step 309-312 repeatedly is until reaching more than the setting, controls to the speed of step 132 reaching the above step transition of setting in step 312.In addition, do not detect in step 310 and move to A
1During pattern, in step 313 increase and correction FET (U-W) (upper arm) is carried out on-state (on duty) ratio of the pwm signal of break-make (ON/OFF) control, and turn back to the later processing of step 310.
Below, in initial step 301, when being judged to be reverse, at the Mode A of step 314 with the present present position of rotor
0Energising.From present mode position A
0See, move to reverse direction only position of deviation, be A
1=A
0During-1 pattern, instantaneous to Mode A in order not postpone control ground
1Energising will be in step 315 with Mode A
0-1 places the register of MCU, judges whether move on to Mode A in step 316
1The position.Move to Mode A
1Position one obtain confirming, just in step 317 with A
1The pattern energising.Then FET (U-W) (upper arm) is carried out the on-state ratio of the pwm signal of break-make (ON/OFF) control, and carry out the later processing of step 315 repeatedly in step 318 increase and correction.Do not moved to A if detect in step 316
1Pattern, then the outdoor fan motor stops.At this moment, the on-state of the pwm signal when step 319 handle stops to store than (initialization), the processing of the step 308 when moving to above-mentioned stopping, and outdoor draft fan continues rotation to positive veer and goes down.
Come to this, by processing shown in Figure 4, at prestart outdoor fan state be in just change or reverse and rotary speed below setting, perhaps be in various situations such as halted state, the rotating speed that can both make outdoor fan on positive veer speedup to more than the setting.
Especially, as step 318 finding,, so compared with the prior art, can stop fan with the short time and reverse because have the function of the on-state ratio that increases gradually and revise pwm signal.And, as step 319 finding, because can start control to positive veer by the pwm signal of the on-state ratio during fan in stopping to reverse, thus smooth and easy from reversing to the transition of just changeing, can improve rising edge when starting.
Its result, even because of the different state generation many variations that make outdoor fan of wind direction, wind speed, also priming chamber's external fan easily.
Like this, the not influence of outdoor fan when wind is not only starting obviously, is forwarding the also not influence of speed control stage to from starting control.General processing as this situation, implement so-called FEEDBACK CONTROL exactly, that is: in the actual speed of sensing chamber's external fan, poor according to detection speed and instruction speed, when being higher than command speed, reducing and revise the on-state ratio of pwm control signal, increase and revise the on-state ratio of pwm control signal when being lower than command speed.
And, do not take place to surpass a reference value in order to make the actual electric current that flows at FET, also taked measure, as with detection electric currents such as CT, suppress the increase of the on-state ratio of pwm control signal in the stage that reaches preset value.
In the mode of present embodiment, has the Current Control function, it is not by detecting current value, but prevent overcurrent control than (inferring current value) according to it with the on-state of pwm control signal, its concrete function has: when the on-state ratio of pwm signal arrives first limits value, ignore the rotary speed instruction of brushless motor, according to the release control function of instructing corresponding pwm signal to control with lower rotary speed; Even ignore the control of rotary speed instruction, when the on-state ratio of pwm signal reaches greater than predefined second limits value of first limits value, the function that brushless motor is stopped; When detecting the brushless motor swing circle, when detected swing circle is lower than above-mentioned drive unit instruction swing circle certain value, stop the function of the switching control of brushless motor.For its action roughly is described, Fig. 6 shows the graph of a relation of rotary speed instruction value and the on-state ratio of pwm control signal.Among the figure, straight line A represents, current value no longer up increases and reduces the value that the rotary speed instruction value reduces the on-state ratio when making on-state than the value on arriving this line, and straight line B represents, when on-state stops value to the motor energising during than the value that arrives on this line.Equal to ignore FEEDBACK CONTROL because suppress the on-state ratio, so in this specification this is called " release " (release), below the value on the straight line A is called release conditions (release duty) ratio, the value on the straight line B is called halted state (stop duty) ratio.In addition, Fig. 7 illustration at first limits value of rotary speed instruction be release conditions than and second limits value be the halted state ratio.These values all are stored among the ROM of MCU32, prevent overcurrent control.
Thisly prevent overcurrent control, for example, C point outdoor fan is driving the occasion of rotation in Fig. 6, and is shown in dotted line during the rotating speed that can not get having instructed owing to wind effect, and the on-state ratio is increased and revises.In its increase process, the release conditions on arriving straight line A than the time, accomplish when reducing the rotary speed instruction value, to change over on-state than low pwm signal, make on-state than the value that is no more than on the straight line A.Yet, in the process of implementing control inhibition on-state ratio, to consider that also on-state is than the situation that surpasses straight line A.Therefore, in the occasion that C point outdoor fan is driven in rotation, on-state than increase the halted state reach on the straight line B than the time, just stop constantly switching at this.
Fig. 8 prevents the flow chart of the handling procedure of the MCU32 that overcurrent is controlled for expression corresponding to this.That is, carry out FEEDBACK CONTROL in step 401, then, the release conditions that read with respect to the rotary speed instruction value in step 401 compare and the halted state ratio.Then, whether compare greater than the release conditions ratio in the on-state of step 403 judgement with the corresponding pwm signal of rotary speed instruction value.If the on-state of pwm signal is compared release conditions when big, whether the on-state of judging pwm signal in step 404 is than greater than the halted state ratio again.According to its result, when the on-state of pwm signal than greater than halted state than the time, stop energising in step 406 and make the outdoor fan stall.That is, the on-state ratio of getting pwm signal is 0%.Then, in the moment that has crossed predetermined dwell time (6 seconds) it is restarted in step 106.
On the other hand, the on-state ratio that is judged to be pwm signal in step 404 is not more than halted state when comparing, ignore the processing of feedback processing in step 407 after, by reducing pwm signal on-state ratio, implement to reduce the processing of rotary speed instruction value in fact in step 404.
So, in speed control, not to adopt CT etc., but just can prevent overcurrent control by infer electric current from the on-state ratio of pwm control signal, therefore avoid the maximization of control device.
In the above-described embodiments, release conditions when halted state are stored among the ROM than all, and carry out subsequently processing in the value that step 402 reads them, but way instead, and for example also available following formula is calculated release conditions and compared Y
1And halted state compares Y
2
Y
1＝U·X+a(1)
Y
2＝U·X+b(2)
Wherein, X: rotary speed (rotating speed) command value
U: proportionality constant (slope of Fig. 6 cathetus A, B)
A, b: constant (intercept of Fig. 6)
In addition, it is also measurable to scrape fitful wind suddenly in speed control.At this moment, might outdoor fan speed descend rapidly, current value increases rapidly.As countermeasure, best position detection signal according to position detecting circuit 52, detect the period L a that brushless motor rotates a circle, when this period L a is following than the low certain value C (C＞0) of instruction rotation number period L s, implement outdoor fan and stop control, the control program of this situation is shown in Figure 13 flow chart.
That is, read in step 501 and to set room temperature Ts, step 502 read in detect room temperature Ta after, step 503 calculate set room temperature Ts and the temperature difference Δ T that detects room temperature Ta (=Ts-Ta).Then, for example select and the corresponding outdoor fan rotation number of temperature difference Δ T from the storing value of the ROM of MCU in step 504, as the instruction rotation number, output is worth corresponding pwm signal with this with obtained rotation number.Then, in step 505 or calculate period L s, or read in the value that is stored among the MCU ROM corresponding to the instruction rotation number.
Below, whether the edge of reinvestigating the U phase signals that obtains through position detecting circuit 52 in step 506 is detected, when being detected at this edge, in the timing operation of step 507 beginning timer.Then, whether the edge of investigating the U phase signals in step 508 once more is detected, and when this edge was detected, the timing that stops timer in step 509 was operated, and reads in count value at that time.Calculate outdoor fan and the corresponding period L a of actual rotation number in step 510 according to the count value of timer.Again will be corresponding to the value Ls-C of period L s after cutting certain value C of instruction rotation number in step 511, compare with period L a corresponding to actual rotation number, if not La＜Ls-C, but La 〉=Ls-C, then carry out speed feedback control in step 512, if La＜Ls-C, then carry out control and the finishing control of stopping of outdoor fan in step 513.
By doing like this,, can control faster also and can improve security for processing shown in Figure 8.
In the above-described embodiments, the starting control and the speed control of the outdoor fan of the off-premises station that constitutes air conditioner is illustrated, but the present invention does not limit to this application, can be applicable to the fan control beyond the air conditioner yet.
By above explanation obviously,, can when starting, not be subjected to the influence of wind speed or wind direction, make the outdoor draft fan starting reliably according to the present invention.
Have again,, when implementing to prevent overcurrent control in the speed control after starting, can therefore, can realize the miniaturization of control device without sensors such as CT according to another invention.
Claims (4)
1. drive for outdoor draft fan, it has: the brushless motor that drives outdoor draft fan; Drive circuit with upper arm and underarm, the a plurality of switching devices that are connected between a plurality of terminals of described upper arm by the plus end that switches dc source and above-mentioned brushless motor constitute, and a plurality of switching devices that are connected between a plurality of terminals of described underarm by switching dc source negative terminal and above-mentioned brushless motor constitute; Detect the position detecting device of above-mentioned rotor of motor having no brush position; Detect above-mentioned brushless motor rotary speed according to above-mentioned position detecting device output signal, make the rotary speed and the rotary speed instruction that detect consistently carry out the speed control unit that break-make is controlled a plurality of switching devices of described drive circuit,
It is characterized in that this drive unit also has: above-mentioned brushless motor prestart detects the discriminating gear of above-mentioned brushless motor direction of rotation and rotary speed according to the output signal of above-mentioned position detecting device; When detected prestart rotary speed is reversed in the following direction of rotation of predetermined setting, make above-mentioned switching device the driving signal powered-on mode with from the consistent energising again of the integrated mode of the detection signal of above-mentioned position detecting device, the reverse arresting stop that the rotation of above-mentioned brushless motor is stopped.
2. drive unit as claimed in claim 1 is characterized in that, described reverse arresting stop has the correcting device that increases gradually and revise the on-state ratio that drives signal.
3. drive unit as claimed in claim 2, it is characterized in that, described reverse arresting stop has motor in making reverse when stopping, can store the on-state ratio of the driving signal when stopping, and begin starting device to the starting control of positive veer with the driving signal of this on-state ratio.
4. drive unit as claimed in claim 1, it is characterized in that, described discriminating gear, after from the variation of the integrated mode of described position detecting device detection signal, detecting brushless motor and just changeing or reverse, if do not detect and just changeing or when reversing the preassigned pattern of setting accordingly, then differentiating is that position detecting device is unusual, ends the driving of outdoor draft fan.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25142895A JP3442203B2 (en) | 1995-09-28 | 1995-09-28 | Outdoor blower drive |
| JP251428/1995 | 1995-09-28 | ||
| JP251428/95 | 1995-09-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1147076A CN1147076A (en) | 1997-04-09 |
| CN1105887C true CN1105887C (en) | 2003-04-16 |
Family
ID=17222703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96103467A Expired - Fee Related CN1105887C (en) | 1995-09-28 | 1996-02-29 | Drive for outdoor draft fan |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3442203B2 (en) |
| CN (1) | CN1105887C (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3971520B2 (en) | 1998-10-14 | 2007-09-05 | 東芝キヤリア株式会社 | Brushless motor drive device for outdoor fan of air conditioner |
| JP4436651B2 (en) * | 2003-10-17 | 2010-03-24 | 東芝キヤリア株式会社 | Refrigeration cycle equipment |
| JP2005171843A (en) * | 2003-12-10 | 2005-06-30 | Toshiba Kyaria Kk | Fan control device |
| JP5056143B2 (en) * | 2007-04-25 | 2012-10-24 | ダイキン工業株式会社 | Fan control system |
| JP5333881B2 (en) * | 2007-04-27 | 2013-11-06 | 日立工機株式会社 | Electric tool |
| JP5292768B2 (en) * | 2007-10-31 | 2013-09-18 | ダイキン工業株式会社 | Humidity control device |
| JP2010169292A (en) * | 2009-01-21 | 2010-08-05 | Mitsubishi Electric Corp | Method of controlling air conditioner, and air conditioner |
| TWI401401B (en) * | 2010-07-16 | 2013-07-11 | Ind Tech Res Inst | Apparatus and method for controlling flow and thermal condition |
| AU2012325745B2 (en) * | 2011-10-21 | 2018-07-26 | Prime Datum, Inc. | Direct drive fan system with variable process control |
| CN102997373B (en) * | 2012-12-28 | 2014-11-05 | 海信（山东）空调有限公司 | Method for controlling outdoor fan of air conditioner according to environmental wind direction |
| JP6096089B2 (en) * | 2013-09-20 | 2017-03-15 | ミネベアミツミ株式会社 | Motor drive control device and control method of motor drive control device |
| CN104682814A (en) * | 2013-11-29 | 2015-06-03 | 台达电子工业股份有限公司 | Fan air-return-preventing system and fan air-return-preventing method |
| CN103912920B (en) * | 2014-03-18 | 2016-08-17 | 张伟斌 | Outdoor air purifier |
| CN104791282B (en) * | 2014-12-12 | 2016-06-15 | 广西科技大学鹿山学院 | A kind of infrared temp. control electric fan speed regulating method |
| CN106642572B (en) * | 2016-12-19 | 2019-06-28 | 广东美的制冷设备有限公司 | Air-conditioner control method, controller and air conditioner |
| CN106685280A (en) * | 2016-12-23 | 2017-05-17 | 惠州市蓝微电子有限公司 | Method for simply controlling commutation angle of direct current brushless motor without hall |
| CN110868117B (en) * | 2018-08-27 | 2021-06-25 | 硕呈科技股份有限公司 | Fixed rotation direction starting method of single-phase sensorless direct current brushless motor |
| US11835054B2 (en) * | 2019-10-17 | 2023-12-05 | Dassault Systemes Simulia Corp. | Method for automatic detection of axial cooling fan rotation direction |
| CN113944996A (en) * | 2020-07-17 | 2022-01-18 | 海信（山东）空调有限公司 | Air conditioner and outdoor fan control method |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0744778B2 (en) * | 1986-10-23 | 1995-05-15 | 松下電器産業株式会社 | Brushless motor protector |
| JPS6474089A (en) * | 1987-09-11 | 1989-03-20 | Hitachi Ltd | Method and device for controlling brushless motor having position detector |
| JPH0510273A (en) * | 1991-07-04 | 1993-01-19 | Ebara Corp | Device for preventing light-load and over-load operation of pump device |
| JP3245720B2 (en) * | 1992-08-20 | 2002-01-15 | 日本電産シバウラ株式会社 | DC motor control circuit |
| JP3080120B2 (en) * | 1992-11-20 | 2000-08-21 | 株式会社富士通ゼネラル | Air conditioner |
| JPH06178586A (en) * | 1992-12-04 | 1994-06-24 | Aisin Seiki Co Ltd | Abnormality detector of brushless motor |
| JP3506457B2 (en) * | 1993-04-23 | 2004-03-15 | 東芝キヤリア株式会社 | Startup control method of compressor in air conditioner |
| JPH07131904A (en) * | 1993-11-04 | 1995-05-19 | Honda Motor Co Ltd | Motor controller for motor operated vehicle |
| JPH07337080A (en) * | 1994-06-10 | 1995-12-22 | Hitachi Ltd | Air-conditioner |
| JP3427575B2 (en) * | 1994-06-29 | 2003-07-22 | 国産電機株式会社 | DC brushless motor and its stopping method |
| JP3365107B2 (en) * | 1994-12-27 | 2003-01-08 | 三菱電機株式会社 | DC brushless motor drive control device for compressor of air conditioner |
-
1995
- 1995-09-28 JP JP25142895A patent/JP3442203B2/en not_active Expired - Fee Related
-
1996
- 1996-02-29 CN CN96103467A patent/CN1105887C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3442203B2 (en) | 2003-09-02 |
| JPH0989352A (en) | 1997-04-04 |
| CN1147076A (en) | 1997-04-09 |
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