CN1311214C - Motor driving device for refrigerator and cooling fan driving device - Google Patents

Abstract

A motor driving device and a cooling fan driving device of a refrigerator are provided to cool down the temperature of a cavity by increasing the flow of refrigerant by regulating rotational speed of a motor according to the change ratio of currents of a q-axis. A motor driving device of a refrigerator for comprising a compressor rotated by a three-phase motor(3A), a condenser, and a cooling cycle having a cooler, and cooling down the inside of a refrigerator compartment and the cooler by compressing refrigerant is composed of an inverter circuit(42) for supplying three-phase driving currents to a stator coil of the motor; a PWM(Pulse Width Modulation) circuit supplying a PWM signal to the inverter circuit; a driving current sensing unit for detecting the three-phase driving current; a d-q converting unit(52) for converting into a d-axis current(Id) of a current component corresponding to magnetic flux and a q-axis current(Iq) of a current component corresponding to torque of the motor based on the three-phase driving current; a rotational speed sensing unit for detecting the rotational speed of the motor; a control unit outputting a speed order signal based on the converted q-axis current; and a speed control unit outputting a control signal to the PWM circuit to be the rotational speed correspondent to the speed order signal based on the detected present rotational speed and the speed order signal. The control unit controls the speed order signal corresponding to the change ratio of the q-axis current and the temperature of a cavity of a refrigerator compartment by regulating the flow of refrigerant flowing through the cooling cycle.

Description

The motor drive of refrigerator and cooling fan drive device

Technical field

The present invention relates to have the refrigerator of cooler.

Background technology

In the past, the refrigerating chamber of refrigerator or the control of refrigerating chamber indoor temperature utilize and are located at the motor that each indoor temperature sensor control is rotated compressor, thereby make the temperature range (patent documentation 1: Japanese kokai publication hei 11-304332 number) of the detected temperature of this temperature sensor in regulation.

Yet as the driving method that adopts vector controlled that has known to the control method of motor, and the driving method (patent documentation 2: TOHKEMY 2003-24686) of this vector controlled is adopted in suggestion on washing machine.

Summary of the invention

As mentioned above; temperature in existing refrigerator because in the employing temperature sensor control refrigerator; so the problem that exists is to be difficult to hold temperature whole in the refrigerator, again because of the thermal capacity of the protection parts such as protective cover of temperature sensor, although temperature has risen and can not respond immediately in the refrigerator.

Because with temperature sensor control, so do not know the load of freeze cycle self, the drive compression machine carries out freeze cycle obstinately by force sometimes.In this case, owing to the control that will alleviate from safety, so there is the problem that suitably to control again to load.

When food placed in face of the temperature sensor, it is blunt that sensor temperature changes, and whether the problem of existence is not know to have new food to put in the refrigerator.

In addition, be difficult for cooling etc. before the air outlet that the air channel obstruction of the cold air flow of cooling fan air-supply or food are placed on cold air, above-mentioned state all can not detect.

Because of not grasping the long-pending white degree on the cooler,,, just consumed electric energy in vain again although refrigerating function is inoperative so the problem that exists is to make the freeze cycle action by force.

The problem of Cun Zaiing is in all in the past schemes in addition, and is all not mentioned when adopting vector controlled, how the temperature inside the box of refrigerator controlled.

So the present invention proposes to adopt the motor of refrigerator drive unit of temperature in the vector control method control refrigerator and the scheme of cooling fan drive device in view of above problem.

The application's the 1st aspect is a kind of motor drive of refrigerator, comprise and having at least by the threephase motor rotation compressor, condenser, the freeze cycle of cooler, utilize and describedly make the cooling of described cooler at the machine compressed refrigerant that contracts, cool off cooling chamber inside again, it is characterized in that, comprise inverter circuit from the three-phase drive electric current to the stator coil of described motor that supply with, supply with the pwm circuit of pwm signal to described inverter circuit, detect the drive current detecting unit of described three-phase drive electric current, according to described detected three-phase drive current transformation become the current component corresponding with magnetic flux be the d shaft current and with the corresponding current component of the torque of described motor be the dg converter unit of g shaft current, detect the rotation speed detection unit of described motor speed, main control unit according to the q shaft current output speed command signal after the described conversion, reaching according to described detected current rotating speed and described speed command signal makes motor speed become the speed control unit of the rotating speed corresponding with described speed command signal to described pwm circuit output control signal, the described speed command signal of the corresponding control of rate of change of described main control unit and described q shaft current is adjusted the refrigerant flow that flows in the described freeze cycle and is controlled temperature in the refrigerator of described cooling chamber.

The application's the 2nd aspect is as the motor drive of the described refrigerator in the 1st aspect, it is characterized in that, described main control unit is that timing is exported described speed command signal and made rotating speed improve at the rate of change of described q shaft current.

The application's the 3rd aspect is as the motor drive of the described refrigerator in the 1st aspect, it is characterized in that, described main control unit is exported described speed command signal at the rate of change of described q shaft current when negative makes described motor speed descend.

The application's the 4th aspect is the motor drive as the described refrigerator in the 1st aspect, it is characterized in that described refrigerator has cooling fan near described cooler, and described main control unit changes described cooling fan rotation speed according to described q shaft current.

The application's the 5th aspect is the motor drive as the described refrigerator in the 1st aspect, it is characterized in that, described refrigerator has and detects the door detecting unit that described cooling chamber door opens and closes usefulness, described main control unit after described door detecting unit detects the state that closes of going out to described refrigerator in temperature control.

The application's the 6th aspect is the motor drive as the described refrigerator in the 1st aspect, it is characterized in that, described refrigerator has the door detecting unit of the door open and-shut mode that detects described cooling chamber, described main control unit after described door detecting unit detects the state that described door closes through the stipulated time after just to described refrigerator in temperature control.

The application's the 7th aspect is the motor drive as the described refrigerator in the 1st aspect, it is characterized in that described main control unit is obtained instantaneous electric power according to described q shaft current and shown on display unit.

The application's the 8th aspect is the electric drive unit as the described refrigerator in the 1st aspect, it is characterized in that described rotation speed detection unit is carried out computing according to the detected three-phase drive electric current of described drive current detecting unit.

The application's the 9th aspect is as the motor drive of the described refrigerator in the 1st aspect, it is characterized in that, described rotation speed detection unit is according to carrying out computing from the position signalling that is located near the position detection unit the described motor rotor.

The application's the 10th aspect is the motor drive as the described refrigerator in the 1st aspect, it is characterized in that described motor is three phase induction motor or three-phase brushless DC motor.

The application's the 11st aspect is a kind of cooling fan drive device of refrigerator, comprise and having at least by the threephase motor rotation compressor, condenser, the freeze cycle of cooler, this unit is arranged near the described cooler, to the cooling fan of cooling chamber conveying through the cooled cold air of described cooler, it is characterized in that, comprise inverter circuit from the three-phase drive electric current to the fan motor stator coil that makes described cooling fan rotation that supply with, supply with the pwm circuit of pwm signal to described inverter circuit, detect the drive current detecting unit of described three-phase drive electric current, becoming the current component corresponding with magnetic flux according to described detected three-phase drive current transformation is the d shaft current, dq converter unit with the q shaft current of the current component corresponding with described fan motor, detect the rotation speed detection unit of described fan motor rotating speed, main control unit according to the q shaft current output speed command signal after the described conversion, reaching according to described detected current rotating speed and described speed command signal makes motor speed become the speed control unit of the rotating speed corresponding with described speed command signal to described pwm circuit output control signal, described main control unit and the described speed command signal of the corresponding control of the rate of change of described q shaft current are adjusted cold air flow that described cooling fan sends and are controlled temperature in the refrigerator of described cooling chamber.

The application's the 12nd aspect is the cooling fan drive device as the described refrigerator in the 11st aspect, it is characterized in that described main control unit is timing at the rate of change of described q shaft current, exports described speed command signal and makes rotating speed improve.

The application's the 13rd aspect is the cooling fan drive device as the described refrigerator in the 11st aspect, it is characterized in that, when described main control unit is negative at the rate of change of described q shaft current, exports described speed command signal and makes described motor speed descend.

The application's the 14th aspect is the cooling fan drive device as the described refrigerator in the 11st aspect, it is characterized in that, described refrigerator has and detects the door detecting unit that described cooling chamber door opens and closes, described main control unit described door detecting unit detect go out close state after temperature in the described refrigerator of control.

The application's the 15th aspect is the cooling fan drive device as the described refrigerator in the 11st aspect, it is characterized in that, when the q shaft current of described main control unit after described conversion reaches setting, judges long-pending frost on the described cooler.

The application's the 16th aspect is the cooling fan drive device as the described refrigerator in the 11st aspect, it is characterized in that, the q shaft current of described main control unit after described conversion is raised to setting when above, or is that the regulation rotating speed judges that described cooling fan is braking (Lock) state when following by the detected rotating speed of described rotation speed detection unit.

The application's the 17th aspect is as the cooling fan drive device of the described refrigerator in the 11st aspect, it is characterized in that, described main control unit during temperature, when described thermantidote is just stopping, forcing to make the cooling fan rotation in the refrigerator of the described cooling chamber of control.

The application's the 18th aspect is the cooling fan drive device as the described refrigerator in the 11st aspect, it is characterized in that described rotation speed detection unit is carried out computing according to the detected three-phase drive electric current of described current detecting unit.

The application's the 19th aspect is the cooling fan drive device as the described refrigerator in the 11st aspect, it is characterized in that, described rotation speed detection unit is carried out computing according to the position signalling near the position detection unit the rotor that is located at described cooling fan motor.

The application's the 20th aspect is the cooling fan drive device as the described refrigerator in the 11st aspect, it is characterized in that described fan motor is three phase induction motor or three-phase brushless DC motor.

The invention effect

Below the operating state of the motor of refrigerator drive unit of the 1st aspect is described.

Cold-producing medium is sent into cooler, refrigerated cooler with the rotation of motor drives compressor.At this moment, open as refrigerator doors and to put food into, then temperature rises in the refrigerator.Temperature one rises in the refrigerator, and the cooler environment temperature cold-producing medium evaporation capacity that flows in the cooler that also rises increases.Thereby load increases for compressor.

On the other hand, the motor of compressor rotation is rotated with certain speed by the control of the control part of refrigerator, so the load of compressor also increases once increasing drive current.

The dq converter unit with detected drive current be transformed into the current component corresponding with magnetic flux be the d shaft current and with the q shaft current of the corresponding current component of the torque of motor.

When q shaft current input main control unit, the corresponding output speed command signal of main control unit with the rate of change of q shaft current.

Speed control unit becomes and the corresponding rotating speed of this speed command signal it according to the current rotating speed of the detected motor of rotation speed detection unit with from the speed command signal of main control unit to pwm circuit output control signal.

Pwm circuit is corresponding with this control signal supplies with pwm signal, control inverter circuit to inverter circuit.

Inverter circuit is according to the threephase stator coil output three-phase drive electric current of pwm signal to motor.

Thus, the corresponding control rate command signal of main control unit with the rate of change of q shaft current, and can control compressor rotary speed, adjust the refrigerant flow that flows in the freeze cycle.

Utilize above method, put into the refrigerating chamber room temperature when food and just rise, increase with this compressor load q shaft current that also rises.Increase refrigerant flow with the rate of change of q shaft current after this increases is corresponding by adjusting motor speed, make that temperature reduces in the refrigerator.Therefore, also can control the indoor temperature of cooling chamber without temperature sensor.

In the motor of refrigerator drive unit aspect the 2nd, main control unit is that timing judgement food is put in the refrigerator at the rate of change of q shaft current, and the output speed command signal makes rotating speed rise.

In the motor of refrigerator drive unit aspect the 3rd, the sufficiently cooled food temperature of food when main control unit is negative at the rate of change of q shaft current in the judgement refrigerator is low, and the output speed command signal makes rotating speed descend.

In the motor of refrigerator drive unit aspect the 4th, thus the main control unit utilization according to the q shaft current speed of cooling fan is changed and put refrigerator in the corresponding control speed of cooling fan of food.

In the motor of refrigerator drive unit aspect the 5th, main control unit is gone out to closing state time control ice making the temperature inside the box in detection.This is likely owing to when closing, food is put into the cause that refrigerator refrigerator temperature rises after door is opened again.

In the motor of refrigerator drive unit aspect the 6th, main control unit is just controlled temperature in the refrigerator through the stipulated time after detecting door closure state.Even when this point is closed after door is opened again, also be not limited to put into food.Therefore, as put food into and rise through temperature in the refrigerator after the stipulated time, as do not put into food then in the refrigerator temperature keep, so Cai through after the stipulated time temperature in the refrigerator is controlled in order to carry out above-mentioned judgement.

In the motor of refrigerator drive unit aspect the 7th, main control unit shows on display unit by obtaining instantaneous electric power according to the q shaft current, thus can to the user show instantaneous electric power.

In the motor of refrigerator drive unit aspect the 8th, by calculating rotating speed, thereby the motor drive of no sensor can be realized, cost can be saved by the detected drive current of drive current detecting unit.

In the motor of refrigerator drive unit aspect the 9th, because of detecting rotating speed, so can detect correct rotating speed according to position signalling near the position detection unit the rotor that is located at motor.

In the motor of refrigerator drive unit aspect the 10th, adopt three phase induction motor or three-phase brushless DC motor by motor, thus correct and reliably drive compression machine.

Below, the refrigerator cooling fan drive device operating state that the 11st aspect is related to describes.

Drive the cooling fan rotation with fan motor and send cold air to cooling chamber.At this moment, refrigerator doors is opened and is put into food.Make the variations in flow of cold air with the food quantity of putting into, motor load increases or reduces.The main control unit of reason refrigerator control fan motor is with certain speed rotation, thus with the corresponding drive current variations of the load of described motor.

The dq converter unit with detected drive current be transformed into the current component corresponding with magnetic flux be the d shaft current and with the corresponding current component of the torque of fan motor be the q shaft current.

When q shaft current input main control unit, main control unit and the corresponding output speed command signal of q shaft current rate of change.

Speed control unit becomes the rotating speed corresponding with this speed command signal according to the current rotating speed of the detected fan motor of rotation speed detection unit with from the speed command signal of main control unit to pwm circuit output control signal.

Pwm circuit is corresponding with this control signal supplies with pwm signal control inverter circuit to inverter circuit.

Inverter circuit is according to the threephase stator coil output three-phase drive electric current of pwm signal to fan motor.

Utilize above method, the mobile variation of cold air when food is put into cooling chamber is so increase with this load because of cooling fan q shaft current that also rises.Correspondingly with the rate of change of the q shaft current of this increase increase refrigerant flow, make that temperature reduces in the refrigerator by improving speed of cooling fan.Thereby can just control the indoor temperature of cooling chamber without temperature sensor.

In the fan of refrigerator motor drive aspect the 12nd, main control unit is in the rate of change timing of q shaft current, and judgement food is put the interior cold air flow of refrigerator into and become difficult, so the output speed command signal improves rotating speed.

In the fan of refrigerator motor drive aspect the 13rd, when main control unit is negative at the rate of change of q shaft current, judge that food reserves minimizing cold air flow becomes easily in the refrigerator, the output speed command signal makes the rotating speed reduction.

In the fan of refrigerator motor drive aspect the 14th, main control unit detects door closure state time control ice making the temperature inside the box.This is owing to food put into when closing again after door is opened probably and make in the refrigerator that temperature rises in the refrigerator.

In the refrigerator cooling fan drive device aspect the 15th, when the q shaft current of main control unit after conversion arrives setting, detect the long-pending frost on the cooler, for example, be conceived to flowing of cold air, when cooling fan is positioned at downstream one side of cooler, cold air flow variation when on the cooler long-pending frost taking place, air pressure around the cooling fan descends, and the load of fan motor descends, and the q shaft current also descends.Therefore, when being lower than setting, this q shaft current judges that long-pending frost is arranged.In addition, be conceived to flowing of cold air, when cooling fan is positioned at upstream one side of cooler, the mobile variation of cold air when on the cooler long-pending frost taking place, the ambient air pressure of cooling fan rises, and the load of fan motor is risen, and the q shaft current also rises.Thus, judge that long-pending frost is arranged in the value of this q shaft current during greater than setting.

In the refrigerator cooling fan drive device aspect the 16th, the q shaft current of main control unit after conversion rises to setting when above, or by the detected rotating speed of described rotation speed detection unit being regulation rotating speed when following, judges the cooling fan braking.Thus, can positively detect the state of cooling fan braking.

In the refrigerator cooling fan drive device aspect the 17th, main control unit when cooling fan just stops, forcing to make the cooling fan rotation when the indoor temperature of control cooling chamber.This is in carrying out as described refrigerator aspect the 1st during temperature control, if cooling fan does not just change and can not control, so cooling fan is rotated.

In the refrigerator cooling fan drive device aspect the 18th, by calculating rotating speed, thereby the cooling fan drive device of no sensor can be realized, cost can be saved according to the detected drive current of drive current detecting unit.

In the refrigerator cooling fan drive device aspect the 19th, according to detecting rotating speed, so can detect correct rotating speed from the position signalling that is located near the position detection unit the fan motor rotor.

In the refrigerator cooling fan drive device aspect the 20th, adopt three phase induction motor or three-phase brushless dc fan motor by fan motor, thereby can correctly and reliably drive cooling fan.

Description of drawings

Fig. 1 is the block diagram of the refrigerator of the present invention's one example.

Fig. 2 is for beginning to carry out the polar plot that α β changes from three-phase.

Fig. 3 is for beginning to carry out the polar plot that dq changes from α β.

Fig. 4 is for representing chiller temperature, the interior temperature of refrigerator, q shaft current and the time diagram that concerns between the time.

Fig. 5 is the refrigerator skiagraph of this example.

Fig. 6 is the freeze cycle pie graph of this example.

Fig. 7 is the block diagram of the refrigerator of the present invention's one example.

The curve of Fig. 8 for concerning between q shaft current and the fan motor rotating speed among other embodiment of the braking detection method of expression cooling fan.

The mark explanation

The 1A compressor drive apparatus

2 main control units

The 3A air compressor motor

The 4A fan drive device

The 5A fan motor

10 refrigerators

14 refrigerating chambers

16 vegetable compartment

18 the 1st refrigerating chambers

20 the 2nd refrigerating chambers

22 coolers

24 cooling fans

28 compressors

30 freeze cycle

42 inverter circuits

48A PWM forms the unit

The 52dq converter unit

58A speed PI control module

66A speed PI control module

64 three-phase converter units

68A PWM forms the unit

The 1B fan drive device

The 3B fan motor

The 4B compressor drive apparatus

The 5B air compressor motor

48B, 68B PWM form the unit

58B, 66B speed PI control module

The specific embodiment

Below referring to figs. 1 through Fig. 6 the refrigerator 10 of the present invention's one example is described.

(1) structure of refrigerator 10,

The structure of refrigerator 10 is described with reference to Fig. 5.

As shown in Figure 5, in the bin 12 of refrigerator 10, set gradually refrigerating chamber 14, vegetable compartment the 16, the 1st refrigerating chamber the 18, the 2nd refrigerating chamber 20 from the top down, a 14a～20a is set on each chamber.

The back side of refrigerating chamber 14 is provided with the main control unit 2 of the refrigerator 10 that is made of microcomputer.

The back side of the 1st refrigerating chamber 18 is provided with cooler 22, and the top of this cooler 22 is provided with cooling fan 24.

The back side of the 2nd refrigerating chamber 20 is provided with Machine Room 26, in this Machine Room 26 compressor 28 is set.

(2) formation of freeze cycle 30.

The formation of freeze cycle 30 is described with reference to Fig. 8.

The cold-producing medium that compressor 28 is sent here through condenser 32 to capillary 34.

The cold-producing medium that flows out capillary 34 returns compressor 28 circulations after cooler 22 evaporations.

Utilize cooling fan air-supply, each cell 14～20 of the refrigerator 10 of blowing through cooler 22 cooled air.

After circulating, this cold air of sending here returns cooler 22 circulations once again in refrigerator.

(3) structure of the electrical system of refrigerator 10

Structure with reference to the electrical system of the block diagram illustrating refrigerator 10 of Fig. 1.

As shown in Figure 1, by the air compressor motor 3A of drive compression machine 28, drive this air compressor motor 3A compressor drive apparatus 1A, and the main control unit 2 of this compressor drive apparatus of control 1A constitute.Be connected to the fan drive device 4A that the fan motor 5A that drives cooling fan 24 uses in addition on the compressor drive apparatus 1A.Have, main control unit 2 is connected with door switch 14b, 16b, 18b, the 20b of door on 14a～20a that is located at each cell 14～20 respectively again.

Below, the structure of the explanation compressor drive apparatus 1A of elder generation.

Compressor drive apparatus 1A is made of following several parts: promptly inverter circuit 42, and rectification circuit 44, AC power 46, PWM form unit 48A, AD converter unit 50, dq converter unit 52, speed detection unit 54, speed command output unit 56, speed PI control module 58A, q shaft current PI control module 60, d shaft current PI control module 62 and three-phase converter unit 64.

Making compressor 28 rotation compressor motor 3A is the three-phase brushless DC motor.The three-phase of this air compressor motor 3A (u, v, stator winding 40u w), 40v flows through the three-phase drive electric current of inverter circuit 42 on the 40w.

This inverter circuit 42 is that transistor Tr 1～Tr6 constitutes by 6 power switch semiconductors.Have again, though not shown, with this switching transistor Tr1～Tr6 diode that is being connected in parallel in the other direction.Be connected in series with switching transistor Tr1 and Tr4 in addition and detecting the detection resistance R 1 that drive current is used, be connected in series detection resistance R 2, and be connected in series detection resistance R 3 with switching transistor Tr3 and Tr6 with switching transistor Tr2 and Tr5.

Rectification circuit 44 is that AC power 46 is supplied with alternating voltage with industrial power (AC100V), will supply with inverter circuit 42 after its rectification.

PWM forms the gate terminal that unit 48A supplies with pwm signal 6 switching transistor Tr1～Tr6.PWM forms unit 48A according to later three-phase voltage Vu with explanation, Vv, and Vw carries out pulsewidth modulation.Timing according to the rules makes each switching transistor Tr1～Tr6 ON/OFF.

AD converter unit 50 detects the magnitude of voltage on resistance R 1, R2, the R3, and the magnitude of voltage of each phase is transformed into digital quantity from analog quantity, output three-phase drive electric current I u, Iv, Iw.

Dq converter unit 52 is the drive current Iu of AD converter unit 50 output, Iv, Iw be transformed into the current component corresponding with magnetic flux be d shaft current Id and with the corresponding current component of the torque of air compressor motor 3 be q shaft current Iq.

This transform method is shown in (1) formula, and with the Iu of three-phase, Iv, Iw are transformed into I α, the I β of two-phase.The polar plot that concerns between the electric current of Fig. 2 for expression electric current of this three-phase and two-phase.

$\left[\begin{array}{c}\mathrm{I\α}\\ \mathrm{I\β}\end{array}\right]=\sqrt{\frac{2}{3}}\left[\begin{array}{ccc}1& -1/2& -1/2\\ 0& \sqrt{3}/2& -\sqrt{3}/2\end{array}\right]\left[\begin{array}{c}\mathrm{Iu}\\ \mathrm{Iv}\\ \mathrm{Iw}\end{array}\right]---\left(1\right)$

Then, adopt (2) formula to be transformed into q shaft current Iq and d shaft current Id biphase current I α, I β after such conversion.Relation between the drive current of this two-phase and q shaft current Iq, the d shaft current Id has the relation of polar plot as shown in Figure 3.

$\left[\begin{array}{c}\mathrm{Id}\\ \mathrm{Iq}\end{array}\right]=\left[\begin{array}{cc}\cos \mathrm{\θ}& \sin \mathrm{\θ}\\ -\sin \mathrm{\θ}& \cos \mathrm{\θ}\end{array}\right]\left[\begin{array}{c}\mathrm{I\α}\\ \mathrm{I\β}\end{array}\right]---\left(2\right)$

Speed detection unit 54 detects anglec of rotation θ and the rotary speed ω of air compressor motor 3A according to q shaft current Iq and d shaft current Id.Asking the position of air compressor motor 3A rotor according to q shaft current and d shaft current is anglec of rotation θ, by this θ differential is asked rotational speed omega.

The q shaft current Iq output speed command signal S that main control unit 2 is sent here according to dq converter unit 52.To be illustrated afterwards about this control method.

Speed command output unit 56 is according to the speed command signal S of main control unit 2 and the rotational speed omega output reference rotational speed omega ref of speed detection unit 54.Reference rotation speed ω ref is with present rotational speed omega input speed PI control module 58A.

Speed PI control module 58A output reference q shaft current Iqref and benchmark d shaft current Idref, present q shaft current Iq and present d shaft current Id export to q shaft current PI control module 60 and d shaft current PI control module 62 respectively together.

That carries out PI control in q shaft current PI control module 60 also does the current/voltage conversion simultaneously, output q shaft voltage Vq.

That carries out PI control in d shaft current PI control module 62 also does the current/voltage conversion simultaneously, output d shaft voltage Vd.

At first d shaft voltage Vd and q shaft voltage Vq are transformed into the voltage of two-phase in the three-phase converter unit 64 according to (3) formula.

$\left[\begin{array}{c}\mathrm{V\α}\\ \mathrm{V\β}\end{array}\right]=\left[\begin{array}{cc}\cos \mathrm{\θ}& -\sin \mathrm{\θ}\\ \sin \mathrm{\θ}& \cos \mathrm{\θ}\end{array}\right]\left[\begin{array}{c}\mathrm{Vd}\\ \mathrm{Vq}\end{array}\right]---\left(3\right)$

Two phase voltage V α, V β after with this conversion is transformed into three-phase voltage Vu, Vv, Vw according to (4) formula.

$\left[\begin{array}{c}\mathrm{Vu}\\ \mathrm{Vv}\\ \mathrm{Vw}\end{array}\right]=\sqrt{\frac{2}{3}}\left[\begin{array}{cc}1& 0\\ -1/2& \sqrt{3}/2\\ -1/2& -\sqrt{3}/2\end{array}\right]\left[\begin{array}{c}\mathrm{V\α}\\ \mathrm{V\β}\end{array}\right]---\left(4\right)$

Three-phase voltage Vu, Vv, Vw after described PWM formation unit 48A exports this conversion.

Adopt above compressor drive apparatus 1A, detect rotating speed according to d shaft current Id and q shaft current Iq, speed command signal S according to this rotational speed omega and main control unit carries out FEEDBACK CONTROL, forms unit 48A from PWM and makes air compressor motor 3 according to the rotational speed omega ref rotation consistent with speed command signal S to inverter circuit 42 output pwm signals.Inverter circuit 42 is exported the three-phase drive electric currents to the threephase stator winding 40 of air compressor motor 3A in view of the above.

The fan drive device 4A of fan motor 5A by speed PI control module 66A, PWM forms unit 68A and drive circuit 70 is constituted.

Reference rotation speed ω ref input fan drive device 4A from speed command output unit 56 controls the rotation of cooling fan 24 in view of the above.Also have, fan motor 5A is a three-phase brushless DC motor.

Fan drive device 4A is the same with compressor drive apparatus 1A, according to reference rotation speed ω ref, thereby send into drive circuit 70 to fan motor 5A output three-phase drive electric current control rotating speed by forming the pwm signal that unit 68A forms by speed PI control module 66A and PWM.

(4) the 1st of refrigerator temperature the kind of control method

Now in the refrigerator 10 to above-mentioned formation, the 1st kind of control method of regulating temperature in the refrigerator describes.

In the refrigerator 10 of above-mentioned formation, when food storage among refrigerating chamber 14, vegetable compartment the 16, the 1st refrigerating chamber the 18, the 2nd refrigerating chamber 20 at least one chamber the time temperature rises in the refrigerator because the thermal capacity that this food is held makes.So the air themperatures of returning by refrigerator inside in the cooler 22 rise, the amount of the cold-producing medium of cooler 22 evaporations is increased, the load that is added in freeze cycle 30 and is on the compressor 28 increases.

In this case, the rotating speed of controlling air compressor motor 3A according to the speed command signal S from refrigerator 10 main control units 2 is kept necessarily it, so the torque that is added on the air compressor motor 3A increases.

Torque one increases q shaft current Iq also along with increase.

According to said method, when because the thermal capacity held of food when making that temperature continues to rise in the refrigerator, then because of being added in the load increase on the freeze cycle 30, so q shaft current Iq also increases.

The variable quantity of this q shaft current Iq is because of proportional with the thermal capacity of putting into refrigerator food, so calculate the slope of the q shaft current Iq of dq converter unit output at main control unit 2, size according to this slope (increment of time per unit), main control unit 2 control rate command signal S, the rotating speed of controlling this air compressor motor 3A and cooling fan 24 makes its rising.

Thus, when putting food into, the rotating speed increase of corresponding air compressor motor 3A and cooling fan 24 increases the ability of freeze cycle 30, stops because the tendency that the food of putting into causes refrigerator temperature to rise makes the interior temperature of refrigerator remain on uniform temperature.

On the other hand, put food into after after a while, this food of putting into is cooled, and temperature descends in the refrigerator, the load one that promptly is added on the compressor 28 when freeze cycle 30 alleviates, q shaft current Iq also descends, so main control unit 2 calculates the slip of q shaft current Iq time per unit, corresponding output speed command signal S makes the rotating speed of air compressor motor 3A and cooling fan 24 descend.By like this, when the food temperature of putting into is low, the ability of compressor 28 also descends, and temperature can not be lower than the temperature range of regulation in the refrigerator.

(5) the 2nd kind of control method of temperature in the refrigerator

Now 2 kinds of control methods of temperature control in the refrigerator that replaces above-mentioned the 1st kind of control method are described.

In the 1st kind of control method, be that the rate of change of obtaining q shaft current Iq after temperature begins to rise in putting the food refrigerator into is controlled, and in the 2nd kind of control method, then as shown in Figure 4, be the door 14a～20a unlatching according to each cell 14～20, the moment that reaches when closing is thereafter controlled.

Be specially, when putting food into, must open in each cell 14～20 at least Yishanmen (for example refrigerating chamber 14a) and close again thereafter.Therefore, when detecting the closed condition of the 14a that gos out with door switch 14b, main control unit 2 also begins to detect the rate of change of q shaft current Iq.

And, as shown in Figure 4, in the thermal capacity of holding owing to the food of storing the temperature inside the box is risen, under the situation that q shaft current Iq also increases, main control unit 2 is obtained the slope of q shaft current Iq, with the corresponding output speed command signal of the increment of its time per unit rate of change S the rotating speed of air compressor motor 3A and cooling fan 24 is risen.

By like this, can correctly detect the moment that food is put refrigerator into, be convenient to carry out the temperature inside the box control.For example, even an on-off action is being arranged but do not put under the situation of food, because the temperature inside the box only rises slightly a bit, q shaft current Iq does not increase yet, and needn't control temperature in the refrigerator.In addition, at the big food of thermal capacity such as food of putting into heat, or during the food of typical temperature,, the temperature inside the box to implement above-mentioned control method because rising.And can correctly and reliably detect the moment of whether carrying out this control according to the signal of door switch 14b～20b.

(6) the 3rd kind of control method of temperature in the refrigerator

Below, the 3rd kind of control method of temperature in the refrigerator of refrigerator 10 is described.

Be to detect the q shaft current Iq that begins from the moment that door is closed in the 2nd kind of control method, but the 3rd kind of control method is through the q shaft current Iq behind the stipulated time t0 after detecting gate is closed.

That is, as after putting into the food of thermal capacity soon, unclear is to cause the temperature inside the box to rise owing to open the door, still because the thermal capacity of food rises the temperature inside the box.So, after main control unit 2 instrumentations are closed the door through the rate of change of the q shaft current Iq behind the stipulated time t0.

For example, as being shutter door or putting under the situation of the little food of thermal capacity, big after door is closed through its slip change after the rising in a single day of the q shaft current Iq behind the stipulated time t0.That is, after door is closed soon because the switching etc. of door influence q shaft current Iq also increases, but as shutter door or put into the little food of thermal capacity only, the slip of the q shaft current Iq after then it increases becomes greatly.When slip was big, main control unit 2 is judged did not almost have load output speed command signal S to make rotating speed be maintained, even or rotating speed to rise also be that rising is arranged slightly.

It is contemplated that on the other hand the slip through the q shaft current Iq behind the stipulated time t0 when putting the big food of thermal capacity into is little, or does not reduce on the contrary also to increase.Therefore, put the big food of loading into for judging through the occasion of little occasion of the slip of q shaft current Iq behind the stipulated time t0 and increase, output speed command signal S makes the rotating speed of air compressor motor 3A and cooling fan 24 improve.

(7) the 4th kind of control method of temperature in the refrigerator

Be to begin rate of change output speed command signal S in the 3rd kind of control method through the q shaft current Iq behind the stipulated time t0 according to moment of closing from door, but in the 4th kind of control method, be to close the back according to door to judge that after the maximum that records q shaft current Iq its slip is greatly or little.

Rate of change as the q shaft current Iq of instrumentation after recording maximum, if the slip after its maximum then is greatly the little food of thermic load or only is a switching, then judge in the less occasion of slip and to put the big food of thermic load into, can be according to the speed command signal S control air compressor motor 3A corresponding and the rotating speed of cooling fan 24 with it.

It is also contemplated that put the big food of thermic load into, when not having the value of the maximum q shaft current Iq of continuous instrumentation q shaft current Iq to increase, in this case, even when also not measuring maximum, judge that q shaft current Iq continues increase and makes air compressor motor 3A and cooling fan 24 rotations according to maximum (top) speed output speed command signal S through stipulated time t1.

(8) the 5th kind of control method of temperature in the refrigerator

The 5th kind of control method gone out the opening time according to the door switching calculated signals that door switch 14b～20b detects.Utilize q shaft current Iq detecting gate to close the back increases torque along with freeze cycle 30 loads increase again simultaneously.And, make the temperature inside the box be maintained according to the variation control compressor 28 of switching time of door and q shaft current Iq and the rotating speed of cooling fan 24.

Be specially be controlled to many more, q shaft current Iq of door time of opening increment rate more at most rotating speed also all the more improve.

(9) modification

Above-mentioned each control method adopts q shaft current Iq only temperature in the refrigerator to be controlled, in addition, main control unit 2 is connected with the liquid crystal display that the energy numeral shows, torque component according to air compressor motor 3 is that q shaft current Iq calculates the instantaneous electric power that air compressor motor 3A consumes, and shows this instantaneous electric power by liquid crystal display.

This liquid crystal display for example by be installed in refrigerating chamber 14 the door 14a the front, the user can confirm the power consumption of present refrigerator.

(modification)

Above-mentioned example is one of the present invention example, only otherwise deviate from aim of the present invention and can change it.

(1) modification 1

Cooler is one in the refrigerator 10 of above-mentioned example, also can divide the refrigerating chamber that is arranged with cooler and refrigerating chamber cooler, implements 5 kinds of control methods that illustrated according to above-mentioned example on cooler separately.

(2) modification 2

Air compressor motor 3A and fan motor 5A are three-phase brushless DC motor, but also available three phase induction motor replaces.

Then, referring to figs. 1 through Fig. 3 and Fig. 5 to Fig. 8 other example of the present invention is described.

(1) structure of refrigerator 10

The structure of refrigerator 10 had been done explanation with reference to Fig. 5.

(2) formation of freeze cycle 30

The formation of freeze cycle 30 had been done explanation with reference to Fig. 6.

(3) electrical system of refrigerator 10 constitutes

Electrical system referring now to the block diagram illustrating refrigerator 10 of Fig. 7 constitutes.Be marked with now with the part of the identical mark of Fig. 1 and be omitted for its explanation of formation identical with Fig. 1.As shown in Figure 7, by the fan motor 3B that drives cooling fan 24, drive this fan motor 3B cooling fan drive device 1B, and the main control unit 2 of this cooling fan drive device of control 1B etc. constitute.Cooling fan drive device 1B connects the compressor drive apparatus 4B that the air compressor motor 5B of drive compression machine 28 uses in addition.Have, main control unit 2 connects door switch 14b, 16b, 18b, the 20b that is located at respectively on 14～20 14a～20a of each cell again.

The structure of cooling fan drive device 1B is described earlier.

Cooling fan drive device 1B is by inverter circuit 42, and rectification circuit 44, AC power 46, PWM form unit 48B, AD converter unit 50, dq converter unit 52, speed detection unit 54, speed command output unit 56, speed PI control module 58B, q shaft current PI control module 60, d shaft current PI control module 62 and three-phase converter unit 64 and constitute.

Making the fan motor 3B of cooling fan 24 rotations is three-phase brushless DC motor.Flow through the three-phase drive electric current of inverter circuit 42 on stator winding 40u, the 40v of the three-phase of this fan motor 3B (u phase, v phase, w phase), the 40w.

PWM forms unit 48B and supplies with pwm signal to the gate terminal of 6 switching transistor Tr1～Tr6.PWM forms unit 48B according to later on three-phase voltage Vu, Vv, the Vw that illustrates being carried out pulsewidth modulation, and the moment according to the rules makes each switching transistor Tr1～Tr6 ON/OFF.

AD converter unit 50 detects at the magnitude of voltage that detects on resistance R 1, R2, the R3, and the magnitude of voltage of each phase is transformed into digital quantity from analog quantity, drive current Iu, Iv, the Iw of output three-phase.

Dq converter unit 52 with drive current Iu, Iv, the Iw of AD converter unit 50 output be transformed into the current component corresponding with magnetic flux be d shaft current Id and with the corresponding current component of the torque of fan motor 3B be q shaft current Iq.

Speed detection unit 54 detects anglec of rotation θ and the rotational speed omega of fan motor 3B according to q shaft current Iq and d shaft current Id.Obtaining fan motor 3B rotor-position according to q shaft current and d shaft current is rotational angle theta, by this rotational angle theta differential is obtained rotating speed.

The q shaft current Iq output speed command signal S that main control unit 2 is sent here according to dq converter unit 52.To illustrate afterwards about this control method.

Speed command output unit 56 is according to the speed command signal S of main control unit 2 and the rotational speed omega output reference rotational speed omega ref of speed detection unit 54.Reference rotation speed ω ref and present rotational speed omega be input speed PI control module 58B together.

Speed PI control module 58B output reference q shaft current Iqref and benchmark d shaft current Idref, present q shaft current Iq and present d shaft current Id export to q shaft current PI control module 60 and d shaft current PI control module 62 respectively together.

Three-phase voltage Vu, Vv, the Vw of three-phase converter unit 64 after described PWM formation unit 48B exports its conversion.

Utilize above cooling fan drive device 1B to detect rotating speed according to d shaft current Id and q shaft current Iq, speed command signal S according to this rotational speed omega and main control unit 2 carries out FEEDBACK CONTROL, form unit 48B to inverter circuit 42 output pwm signals from PWM, make fan motor 3 according to the rotational speed omega ref rotation consistent with speed command signal S.Inverter circuit 42 is exported the three-phase drive electric currents to the threephase stator winding 40 of fan motor 3B in view of the above.

The compressor drive apparatus 4B of air compressor motor 5B by speed PI control module 66B, PWM forms unit 68B and drive circuit 70 constitutes.

The reference rotation speed ω ref input compressor drive apparatus 4B of speed command output unit 56 controls compressor 28 rotations in view of the above.Also have, air compressor motor 5B is a three-phase brushless DC motor.

Compressor drive apparatus 4B is the same with cooling fan drive device 1B, according to reference rotation speed ω ref the pwm signal of speed PI control module 66B and PWM formation unit 68B formation is sent into inverter circuit 70, by export three-phase drive Current Control rotating speed to air compressor motor 5B.

(4) the 6th kind of control method of temperature in the refrigerator

The 6th kind of control method of regulating temperature in the refrigerator in the refrigerator 10 of above-mentioned formation described.

In the refrigerator 10 of above-mentioned formation, in refrigerating chamber 14, vegetable compartment the 16, the 1st refrigerating chamber the 18, the 2nd refrigerating chamber 20, at least one chamber,, be added in the cooling fan 24 loads increase of sending cold air then because this food makes the mobile change of cold air bad as food storage.

At this moment, control according to speed command signal S and to make the rotating speed of fan motor 3B keep necessarily, so the torque that is applied on the fan motor 3B increases from refrigerator 10 main control units 2.

Torque one increases q shaft current Iq and also increases.

By above method, become bad once putting flowing of food cold air into, the load that is added on the cooling fan 24 increases, so q shaft current Iq also increases.

The variable quantity of this q shaft current Iq is because of proportional with the amount of putting into refrigerator food, so calculate the slope of the q shaft current Iq that exports by the dq converter unit at main control unit 2, corresponding with the value of this slope (increment of time per unit), main control unit 2 control rate command signal S are controlled to and make the rotating speed of fan motor 3B and air compressor motor 5B raise.

Thus, food one is put into, and the rotating speed increase of respective fans motor 3B and air compressor motor 5B increases cooling capacity therewith, stoped owing to put the trend that food causes the temperature inside the box to rise into, thereby temperature is held certain in the refrigerator.

In addition, when food one takes out, only the food of this part taking-up makes the load reduction on the mobile cooling fan 24 that is improved of cold air, and q shaft current Iq also just reduces.Main control unit 2 calculates the slip of q shaft current Iq time per unit, and corresponding output speed command signal S makes the rotating speed of fan motor 3B and air compressor motor 5B descend.By like this, when taking out food, the ability of cooling fan 24 also descends, and temperature can not be lower than the set point of temperature scope in the refrigerator.

(5) the 7th kind of control method of temperature in the refrigerator

Now the 7th kind of control method to temperature in the refrigerator describes, and replaces above-mentioned the 6th kind of control method.

The 6th kind of control method is to put into the rate of change of obtaining q shaft current Iq after the temperature inside the box begins to rise from food to control, and the 7th kind of control method is as shown in Figure 4, opens the door 14a～20a of each chamber 14～20, according to after moment when closing control.

Be specially, when putting food into, open the door (for example refrigerating chamber 14a) of at least one chamber in each chamber 14～20, close again afterwards.Therefore, when detecting the closed condition of the 14a that gos out with door switch 14b, main control unit 2 begins to detect the rate of change of q shaft current Iq.

Utilize this detection, can detect the moment that food is put into exactly, control temperature in the refrigerator easily.For example, even had unlatching but not put under the situation of food,,, q shaft current Iq needn't not control temperature in the refrigerator so also not increasing because flowing of cold air do not change at door.In addition, when putting a large amount of food into, will adopt above-mentioned control method because of the mobility status change of cold air is bad.And, utilize the signal of door switch 14b～20b can correctly and reliably detect the moment of carrying out this control and the moment of not carrying out this control.

(6) about the explanation of defrosting control method

When the q shaft current of main control unit 2 after conversion arrives predetermined setting (hereinafter referred to as long-pending white reference current value), detect the long-pending frost on the cooler 22.

As mentioned above, as be conceived to flowing of cold air, because cooling fan 24 is in the downstream of cooler 22, the mobility status of cold air becomes bad when on the cooler 22 long-pending frost taking place, air pressure around the cooling fan 24 descends, and the fan motor 3B easy rotary load that becomes alleviates, and the q shaft current also descends.Thereby, when being lower than long-pending white reference current value, the value of this q shaft current judges that long-pending frost is arranged, begin defrosting control

Moreover refrigerator 10 its cooling fans 24 of this example are positioned at the downstream of cooler 22, but are conceived to flowing of cold air, and cooling fan 24 is positioned at the upstream side of cooler sometimes.

In this case, the mobility status that on the cooler in a single day long-pending white cold air is arranged is with regard to variation, and the air pressure around the cooling fan 24 raises, and the load of fan motor 3B increases, and the q shaft current also rises.Therefore, as shown in Figure 8, judge that long-pending frost is arranged when the value specific volume frost reference current value of according to the rules rotating speed q shaft current is big, control defrosts.

(7) the braking detection method of fan motor 3B

The braking detection method of fan motor 3B below is described.

When the q shaft current of main control unit 2 after conversion rises to predetermined setting, or become regulation rotating speed (for example rotating speed be zero) when following by speed detection unit 54 detected rotating speeds, judgement cooling fan 24 is braked.Thus, can positively detect the on-position of cooling fan 24.

(8) other

When carrying out above-mentioned various control such as cooling fan 24 stop, because of detecting the q shaft current, institute is so that cooling fan 24 is forced rotation.

(modification)

Above-mentioned example is of the present invention one other example, only otherwise deviate from aim of the present invention and can change it.

(1) modification 1

Cooler in the above-mentioned example in the refrigerator 10 is one, also can divide the refrigerating chamber that is arranged with cooler and cooling fan, refrigerating chamber with cooler and cooling fan, on separately cooler and cooling fan, implement the control method that illustrated in the above-mentioned example.

(2) modification 2

Fan motor 3B and air compressor motor 5B are three-phase brushless direct current DC motor, and also available three phase induction motor replaces.

Industrial practicality

The present invention is applicable to the temperature inside the box control of the refrigerator of cooler, for example be suitable for domestic refrigerator with And miscellaneous service refrigerator.

Claims (20)

1. the motor drive of a refrigerator possesses and has the freeze cycle that drives rotation compressor, condenser, cooler with threephase motor at least,

Utilize described compressor compresses cold-producing medium to make described cooler cooling, cool off cooling chamber inside again, it is characterized in that,

Have

To the stator coil of described motor supply with the three-phase drive electric current inverter circuit,

To described inverter circuit provide pwm signal pwm circuit,

Detect described three-phase drive electric current the drive current detecting unit,

According to described detected three-phase drive electric current, be transformed into the current component corresponding and be with magnetic flux the d shaft current and with the corresponding current component of the torque of described motor be the q shaft current the dq converter unit,

Detect described motor speed rotation speed detection unit,

According to the main control unit of the q shaft current output speed command signal after the described conversion and

According to described detected current rotating speed and described speed command signal, to described pwm circuit output control signal, make motor speed become the speed control unit of the rotating speed corresponding with described speed command signal,

The rate of change of described main control unit and described q shaft current is controlled described speed command signal accordingly, adjusts the refrigerant flow that flows in the described freeze cycle, controls the indoor temperature of described cooling chamber.

2. the motor drive of refrigerator as claimed in claim 1 is characterized in that, described main control unit is that described speed command signal is exported in timing at the rate of change of described q shaft current, makes rotating speed improve.

3. the motor drive of refrigerator as claimed in claim 1 is characterized in that, described main control unit is exported described speed command signal at the rate of change of described q shaft current when negative, makes described motor speed descend.

4. the motor drive of refrigerator as claimed in claim 1 is characterized in that, described refrigerator has cooling fan near described cooler, and described main control unit changes described speed of cooling fan according to described q shaft current.

5. the motor drive of refrigerator as claimed in claim 1, it is characterized in that, described refrigerator has the door detecting unit of the switching usefulness that detects described cooling chamber door, described main control unit described door detecting unit detect go out be in closed condition after to described refrigerator in temperature control.

6. the motor drive of refrigerator as claimed in claim 1, it is characterized in that, described refrigerator has the door detecting unit of the open and-shut mode of the door that detects described cooling chamber, described main control unit described door detecting unit detect described door be in closed condition after through the stipulated time after just to described refrigerator in temperature control.

7. the motor drive of refrigerator as claimed in claim 1 is characterized in that, described main control unit is obtained instantaneous electric power according to described q shaft current and shown on display unit.

8. the electric drive unit of refrigerator as claimed in claim 1 is characterized in that, described rotation speed detection unit is carried out computing according to the detected three-phase drive electric current of described drive current detecting unit.

9. the motor drive of refrigerator as claimed in claim 1 is characterized in that, described rotation speed detection unit is according to carrying out computing from the position signalling that is located near the position detection unit the described motor rotor.

10. the motor drive of refrigerator as claimed in claim 1 is characterized in that, described motor is three phase induction motor or three-phase brushless DC motor.

11. the cooling fan drive device of a refrigerator possesses and has the freeze cycle that is driven rotation compressor, condenser, cooler by threephase motor at least,

Have and be arranged near the described cooler, carry cooling fan, it is characterized in that through the cold air of described cooler cooling to described cooling chamber,

Have

To the fan motor stator coil that makes the rotation of described cooling fan supply with the three-phase drive electric current inverter circuit,

To described inverter circuit provide pwm signal pwm circuit,

Detect described three-phase drive electric current the drive current detecting unit,

According to described detected three-phase drive electric current, be transformed into the current component corresponding and be with magnetic flux the d shaft current and with the corresponding current component of the torque of described fan motor be the q shaft current the dq converter unit,

Detect described fan motor rotating speed rotation speed detection unit,

According to the q shaft current after the described conversion, the main control unit of output speed command signal and

According to described detected current rotating speed and described speed command signal, to described pwm circuit output control signal, make motor speed become the speed control unit of the rotating speed corresponding with described speed command signal,

The rate of change of described main control unit and described q shaft current is controlled described speed command signal accordingly, adjusts the cold air flow that described cooling fan is sent, and controls the indoor temperature of described cooling chamber.

12. the cooling fan drive device of refrigerator as claimed in claim 11 is characterized in that, described main control unit is timing at the rate of change of described q shaft current, exports described speed command signal rotating speed is improved.

13. the cooling fan drive device of refrigerator as claimed in claim 11 is characterized in that, when described main control unit is negative at the rate of change of described q shaft current, exports described speed command signal described motor speed is descended.

14. the cooling fan drive device of refrigerator as claimed in claim 11 is characterized in that, described refrigerator has the door detecting unit of the switching that detects described cooling chamber door,

Described main control unit described door detecting unit detect go out be in closed condition after temperature in the described refrigerator of control.

15. the cooling fan drive device of refrigerator as claimed in claim 11 is characterized in that, when the q shaft current of described main control unit after described conversion reaches setting, judges long-pending frost on the described cooler.

16. the cooling fan drive device of refrigerator as claimed in claim 11, it is characterized in that, the q shaft current of described main control unit after described conversion is raised to setting when above, or the detected rotating speed of described rotation speed detection unit is that the regulation rotating speed is judged described cooling fan braking when following.

17. the cooling fan drive device of refrigerator as claimed in claim 11 is characterized in that, described main control unit during temperature, when described thermantidote is stopping, being forced described cooling fan rotation in the refrigerator of the described cooling chamber of control.

18. the cooling fan drive device of refrigerator as claimed in claim 11 is characterized in that, described rotation speed detection unit is carried out computing according to the detected three-phase drive electric current of described drive current detecting unit.

19. the cooling fan drive device of refrigerator as claimed in claim 11 is characterized in that, described rotation speed detection unit is carried out computing according to the position signalling near the position detection unit the rotor that is located at described cooling fan motor.

20. the cooling fan drive device of refrigerator as claimed in claim 11 is characterized in that, described fan motor is three phase induction motor or three-phase brushless DC motor.

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