CN1047268C

CN1047268C - Electric motor

Info

Publication number: CN1047268C
Application number: CN95121135A
Authority: CN
Inventors: 部知典; 石原学
Original assignee: Sanyo Electric Co Ltd
Current assignee: Sanyo Electric Co Ltd
Priority date: 1994-12-26
Filing date: 1995-12-22
Publication date: 1999-12-08
Anticipated expiration: 2015-12-22
Also published as: KR100323294B1; KR960028563A; TW298684B; JPH08182376A; CN1134623A

Abstract

To control conduction timing switching deviation caused by a resistance error by providing a position detecting section which outputs a proper signal when the time equal to the 1/4-period of a correcting voltage has elapsed after half an hour earlier than the time at which the magnitudes of a reference voltage and correcting voltage are maintained at largest values or smallest values immediately before the magnitudes vary. When a theoretical reference voltage containing no resistance error is represented by '51', the proper signal supplied to a timing signal generating section is outputted at a time TX as a result of the comparison of the magnitude of the waveform 50 of an induced voltage with that of the reference voltage 51. However, since the actual reference voltage is another reference voltage 52 when the resistance error is taken into consideration and the signal is outputted at another time T2, the accurate outputting timing of the proper signal is supplied to the timing signal generating section after correction. Time T1 matches the maximum amplitude time of the induced voltage and the time TX becomes the time when the time equal to the 1/4-period of the induced voltage has elapsed from the time T1. Therefore, the time TX is outputted to the timing signal generating section.

Description

Motor

The present invention relates to be added to the DC motor that the voltage on the stator coil carries out rotating speed control by adjusting.

As this motor that has earlier, the described such motor of special fair 5-10039 communique is arranged.The motor that this communique is put down in writing has rotor that a plurality of magnetic poles are arranged and this rotor is produced a plurality of stator coils in magnetic field, it be a kind of be that the variation of the induced voltage that produces in stator coil according to the rotation by rotor obtains the signal corresponding with the turned position of rotor and switches dc brushless motor to the powered-on mode of stator coil according to this signal.

In this motor that has earlier, the moment that changes according to induced voltage switches to the energising of stator coil regularly.

Therefore, when the variation of this induced voltage constantly error takes place, switch to the energising of stator coil and also to depart from, thereby can not obtain the switching of best energising timing, can not obtain original rotating torque of motor and output sometimes.

When particularly obtaining induced voltage and reference voltage when utilizing electric resistance partial pressure, exist error to cause the problem that this energising switching regularly departs from knifeedge owing to the employed resistance of dividing potential drop, sometimes for motor is turned round expeditiously, even set the high-efficient operation that best energising switching regularly also is difficult to obtain motor.

At these problems, the invention provides the motor that energising switching regularly that a kind of error that can suppress by resistance causes departs from.

Motor of the present invention has rotor, a plurality of stator coil and energising controller, and rotor has a plurality of magnetic poles; A plurality of stator coils produce magnetic field to this rotor; The energising controller switches the galvanic energising of carrying out to above-mentioned stator coil according to the signal that the size variation of induced voltage that is periodically produced by the rotation of above-mentioned rotor and reference voltage generates according to predetermined mode sequence in the said stator coil.In this motor, has position detector, this position detector carries out electric resistance partial pressure from the reference voltage that obtained by electric resistance partial pressure with above-mentioned induced voltage and moment that the size of the correction voltage that obtains changes, the time of certain the big or small state that before above-mentioned correction voltage swing changes, keeps 1/2 before the moment add that the moment after time in 1/4 cycle of correction voltage exports above-mentioned signal.

In addition, motor of the present invention has rotor, threephase stator coil and energising controller, and rotor has a plurality of magnetic poles; The threephase stator coil produces magnetic field to this rotor, is Y-connection; The energising controller switches the galvanic energising of carrying out to above-mentioned stator coil according to the signal that the size variation of the neutral point voltage of induced voltage that is periodically produced by being rotated in the said stator coil of above-mentioned rotor and said stator coil generates according to predetermined mode sequence.In this motor, has position detector, the reference voltage that this position detector obtains from above-mentioned neutral point voltage is carried out electric resistance partial pressure and above-mentioned induced voltage carried out electric resistance partial pressure and moment that the size of the correction voltage that obtains changes, the time of certain size state that before above-mentioned correction voltage swing changes, keeps 1/2 before the moment add that the moment after time in 1/4 cycle of correction voltage exports above-mentioned signal.

In addition, motor of the present invention has rotor, a plurality of stator coil and energising controller, and rotor has a plurality of magnetic poles; A plurality of stator coils produce magnetic field to this rotor; The energising controller switches the galvanic energising of carrying out to above-mentioned stator coil according to the signal that the size variation of induced voltage that is periodically produced by being rotated in the said stator coil of above-mentioned rotor and reference voltage generates according to predetermined mode sequence.In this motor, has position detector, this position detector carries out electric resistance partial pressure from the reference voltage that obtained by electric resistance partial pressure with above-mentioned induced voltage and moment that the size of the correction voltage that obtains changes, and the moment during the above-mentioned correction voltage peak swing of the said reference voltage during certain size state that kept before changing with respect to above-mentioned correction voltage swing adds that moment of time in 1/4 cycle of above-mentioned correction voltage exports above-mentioned signal.

In addition, motor of the present invention has rotor, threephase stator coil and energising controller, and rotor has a plurality of magnetic poles; The threephase stator coil produces magnetic field to this rotor, is Y-connection; The energising controller switches the galvanic energising of carrying out to above-mentioned stator coil according to the signal that the size variation of the neutral point voltage of induced voltage that is periodically produced by being rotated in the said stator coil of above-mentioned rotor and said stator coil generates according to predetermined mode sequence.In this motor, has position detector, the moment when reference voltage that this position detector obtains from above-mentioned neutral point voltage is carried out electric resistance partial pressure and above-mentioned induced voltage carried out electric resistance partial pressure and moment that the size of the correction voltage that obtains changes, the above-mentioned correction voltage peak swing of the said reference voltage during certain size state that kept before changing with respect to above-mentioned correction voltage swing adds that moment of time in 1/4 cycle of above-mentioned correction voltage exports above-mentioned signal.

In addition, motor of the present invention has 1/2 the circuit that neutral point voltage with the threephase stator coil of Y-connection is replaced into the galvanic voltage that is added on the said stator coil in said structure.

In the motor that as above constitutes, the moment that the size of the correction voltage that carries out electric resistance partial pressure from the reference voltage that obtained by electric resistance partial pressure with above-mentioned induced voltage and obtain changes, by the Signal permuting that will generate by the size variation of induced voltage and reference voltage by position detector for time of certain size state of before above-mentioned correction voltage swing changes, keeping 1/2 before the moment add the signal that the moment of the time in 1/4 cycle of revising voltage exports, just can suppress the influence of the error of the employed resistance of electric resistance partial pressure.

In addition, in the motor that as above constitutes, the reference voltage that obtains from above-mentioned neutral point voltage is carried out electric resistance partial pressure and above-mentioned induced voltage carried out electric resistance partial pressure and moment that the size of the correction voltage that obtains changes, by the Signal permuting that will generate by the size variation of induced voltage and neutral point voltage by position detector for time of certain size state of before above-mentioned correction voltage swing changes, keeping 1/2 before the moment add the signal that the moment of the time in 1/4 cycle of revising voltage exports, just can suppress the influence of the error of the employed resistance of electric resistance partial pressure.

In addition, in the motor that as above constitutes, the signal of moment output of time that moment during above-mentioned correction voltage peak swing by the Signal permuting that will be generated by the size variation of induced voltage and reference voltage by the position detector said reference voltage during for certain size state that kept before the size of carrying out the correction voltage that electric resistance partial pressure obtains with respect to the reference voltage that is obtained by electric resistance partial pressure with above-mentioned induced voltage changes adds 1/4 cycle of above-mentioned correction voltage just can suppress the influence of the error of the employed resistance of electric resistance partial pressure.

In addition, in the motor that as above constitutes, the signal of moment output of time that moment during above-mentioned correction voltage peak swing by the Signal permuting that will be generated by the size variation of induced voltage and neutral point voltage by the position detector said reference voltage during for certain size state that kept before changing with respect to the size of neutral point voltage being carried out reference voltage that electric resistance partial pressure obtains and above-mentioned induced voltage being carried out the correction voltage that electric resistance partial pressure obtains adds 1/4 cycle of above-mentioned correction voltage just can suppress the influence of the error of the employed resistance of electric resistance partial pressure.

In addition, in the motor that as above constitutes, in said structure, have neutral point voltage with the threephase stator coil of Y-connection and be replaced into 1/2 circuit of the galvanic voltage that is added on the said stator coil, can generate the neutral point voltage of stator coil with simulating.

Fig. 1 is the block diagram of the motor of expression embodiments of the invention.

Fig. 2 is the concrete circuit diagram that is used for providing to rotor rotating magnetic field.

Fig. 3 is the key diagram that the induced voltage that produces in the signal of switch element and the stator coil is supplied with in expression.

Fig. 4 is the variation of the voltage of expression for example terminal U shown in Figure 2.

Fig. 5 is the flow chart of the energising change action that carries out to stator coil of expression.

Fig. 6 is an oscillogram of supplying with transistorized ON/OFF signal when making Spin Control portion shown in Figure 1 effective.

Fig. 7 is the flow chart of the change action of expression conducting load, is the flow chart that only shows the part of regulating time T on.

Fig. 8 is the flow chart of the action of corrector shown in Figure 1.

Fig. 9 is the concrete circuit diagram of circuit CC shown in Figure 2.

Figure 10 is the oscillogram that induced voltage changes, and is the oscillogram after the applied voltage shown in induced voltage and Fig. 3 (c) is synthesized.

Figure 11 is used to ask the flow chart of TX constantly.

Figure 12 is used to ask the flow chart of other embodiment of TX constantly.

Figure 13 is the oscillogram that the induction voltage waveform after copped wave is handled is carried out in expression.

Figure 14 is that expression is because the key diagram that departs from of the output change location of the comparator that the copped wave of induced voltage causes.

Figure 15 is the flow chart that is used to make the phase place of chopping signal to depart from.

Below, with reference to the description of drawings embodiments of the invention.Fig. 1 is the block diagram of the motor of the embodiment of the invention.Among the figure, the 1st, the drive division of motor is by the rotor with a plurality of magnetic poles with have the stator that this rotor is produced a plurality of stator coils in magnetic field and constitute.Rotor is alternately formed with identical extremely wide configuration on circumference by even numbered poles, and this number of magnetic poles for example is 4 utmost points, still, is not limited to this number of poles.

On stator, a plurality of stator coils are undertaken three by the sequential scheduling compartment of terrain of U phase, V phase, W phase and are connected.This three is connected, no matter be that Y-connection or triangle connect, does not limit the quantity (number of teeth) of the notch that twines stator coil, can use general three-phase brushless motor, and the load of this rotor rotation does not limit fan electromotor and compressor etc. especially yet.

The 2nd, three-phase inverting circuit, be 6 switch elements (power transistor and EFT etc.) to be connected into three-phase bridge circuit shape form, each switch element carries out the ON/OFF action according to ON/OFF (on/off) signal, and the direct current that power circuit 3 is supplied with is transformed to the three-phase alternating current that is combined by square wave.By supplying with stator coil, current waveform is transformed to the three-phase alternating current waveform that constitutes by sine wave by the three-phase alternating current that this square wave forms.

Power circuit 3 is that the alternating current that industrial power 4 is supplied with is transformed to galvanic circuit, mainly is made of voltage doubling rectifing circuit, smoothing circuit and noise filter, obtains the direct current of 280V from the single-phase alternating current of 100V.When industrial power 4 obtains the alternating current of 280V, do not carry out the direct current that general full-wave rectification can obtain 280V equally if do not carry out voltage multiplying rectifier.

The 5th, the direct voltage testing circuit mainly is made of resistance drop volt circuit and impedance inverter circuit.The aanalogvoltage that this direct voltage testing circuit 5 detects is supplied with A/D (mould/number) the conversion input terminal of microcomputer 7.This aanalogvoltage is the digital value of expression direct voltage in the inner transformation of microcomputer 7.

The 6th, ac voltage detection circuit mainly is made of resistance drop volt circuit and impedance inverter circuit.The aanalogvoltage that this ac voltage detection circuit 6 detects is supplied with A/D (mould/number) the conversion input terminal of microcomputer 7.This aanalogvoltage carries out full-wave rectification and level and smooth by computing after the inner transformation of microcomputer 7 is digital value, calculate the effective value (voltage of alternating current) of alternating current.

Microcomputer 7 is mainly by judging that rotor is by specifying the position detector 8 (square that is called position probing among Fig. 1) of turned position and output signal, generate the timing signal maker 9 (Fig. 1 be called the change of current regularly square) of switching according to the signal that obtains from position detector 8 to the timing signal of the energising of stator coil, generate according to this timing signal each switch element of determining three-phase inverting circuit 2 ON/OFF ON/OFF signal (drive signal) and to the energising controller 10 (square that is called drive signal among Fig. 1) of three-phase inverting circuit 2 outputs, the speed detector 11 (square that is called speed among Fig. 1) of the signal of the rotating speed of asking rotor according to the cycle or the numerical value the fixed time of the signal that obtains from position detector 8 and output expression rotating speed, ask from the signal and the difference arithmetic unit 12 of specifying the difference of (value of expression speed) from the speed of outside supply of the speed of this speed detector 11 outputs, according to the output of this difference arithmetic unit 12 to the chopping signal of the ON/OFF of energising controller 10 output control ON loads and to carrying out the chopping signal maker 13 (square that is called copped wave Fig. 1) of copped wave and the rotating speed correction of the rotor that obtains according to each voltage that obtains from direct voltage testing circuit 5 and ac voltage detection circuit 6 with from speed detector 11 constitutes from the generation corrector 14 (square that is called corrector Fig. 1) constantly of the timing signal of timing signal maker 9 outputs to the ON/OFF signal of three-phase inverting circuit 2 outputs from energising controller 10.

Speed detector 11 in the microcomputer 7, difference arithmetic unit 12 and chopping signal maker 13 constitute rotational speed governor, control ON load, thereby in fact control is added to the galvanic voltage on the stator coil, so that the rotating speed of rotor (speed) becomes the rotating speed corresponding with speed command.

Fig. 2 is used to utilize the direct current (DC280V) that obtains from power circuit 3 to supply with the concrete circuit diagram of rotating magnetic fields to rotor 21.

Constitute the element of three-phase inverting circuit 2, so long as the element that can carry out switch control behind the ON/OFF signal of the energising controller 10 of reception microcomputer 7, no matter be that thyristor or EFT or other elements can, in the following description, 22～27 be that typical example describes promptly with such 6 the transistor Tr 1～Tr6 that connect shown in scheming.

Microcomputer 7 output triggers the signal that transistor that control constitutes this three-phase inverting circuit 2 is used according to named order like that as Fig. 3 (b) shown in, have the structure of trigger sequence of determining the transistor Tr 1～Tr6 of three-phase inverting circuit 2 according to the signal of importing position detector 8 shown in Figure 1.Be illustrated in the magnetic pole that encourages on the surface of rotor 21 at the N that marks on the rotor 21, S.

Below, the action overview of the DC motor that is made of such structure is described.In order to make explanation simple, the action of explanation use location detector 8, timing signal maker 9 and energising controller 10 earlier.That is, the correction of back explanation timing signal and rotating speed control.

Obtain the signal of galvanic three-phase inverting circuit 2 according to the turned position of rotor 21 from single phase alternating current power supply 4 through power circuit 3, for example the signal shown in Fig. 3 (b) is supplied with the transistor Tr 1～Tr6 of three-phase inverting circuit 2.Therefore, from three-phase inverting circuit 2 voltage shown in Fig. 3 (c) is added on terminal U, V, the W of the stator coil of driver 1.

Promptly, in the 1st pattern, the ON/OFF signal is defeated by each transistor, make transistor Tr 1, the Tr5 conducting, other transistor Tr 2～Tr4, when Tr6 ends, at stator coil U, electric current shown in the arrow I among the circulation figure between the V, then, (the 2nd pattern) controls each transistor, when making transistor Tr 1, the Tr6 conducting, when other transistor Tr 2～Tr5 ends, at coil U, electric current shown in the arrow II among the circulation figure between the W, and then, each transistor of control makes transistor Tr 2 in the 3rd pattern, the Tr6 conducting, when other transistors end, at stator coil V, electric current shown in the arrow III among the circulation figure between the W.Equally, shown in Fig. 3 (b), connect sequential control transistor Tr 1～Tr6 conduction and cut-off, carry out the circulation of the 1st～the 6th pattern repeatedly from the 3rd pattern to the 6 patterns.

By the such NO/OFF signal of energising controller 10 output from microcomputer 7, just in stator coil according to above-mentioned direction circulating current, if the relation of the expression of pattern ground and each pattern just can obtain the time diagram shown in Fig. 3 (c).

U in the drawings, V, W each mutually in, the conducting of center line upside is illustrated in electric current in the stator coil shown in Figure 2 and circulates to neutral point N from the inlet of each phase, equally, the conducting of center line downside represents that electric current is from inlet U, V, the W circulation of neutral point N to the stator coil of each phase.

Like this, when electric current flows through stator coil U, V, W, owing in stator, form rotating magnetic field, so for example rotor 21 just is rotated.

In general, when rotor shown in Figure 2 21 is in common rotation status, owing to adopt magnetic rotor 21, so, in the running of motor, in each stator coil U, V, W, induce back electromotive force.

Particularly in the embodiment shown in Figure 2, in each trigger mode (pattern 1～6) owing to there is cold stator coil, so, the direct current potential that causes by back electromotive force of appearance between the neutral point N of stator coil and cold stator coil.

The curve u shown in the with dashed lines in Fig. 3 (d), v, w, be exactly that the expression of pattern ground is like this at each stator coil U, V, the voltage of induction between W and the lead 10, its waveform with to each stator coil U, V, it is exactly illustrated state that the pass of the pattern of W energising ties up to when motor is the steady running state, when motor starting and when the load of motor increases, the conducting that does not catch up with each stator coil owing to the rotation of rotor 21 falls behind, so, if the width of the transverse axis of Fig. 3 is constant, then the waveform of the voltage of being responded to will fall behind than the waveform shown in the dotted line among Fig. 3 (d).

The energising switching mode that the present invention adopts, as input, the position of rotation of detection rotor 21 is according to the relation of the rotation status of rotor 21 three-phase inverting circuit 2 being supplied with in the triggering output of the best with the back electromotive force that produces in stator coil U, V, W like this.

Promptly, just represent among Fig. 3 of operating condition of motor U mutually, intermediate point in the starting point of the end point of the 2nd trigger mode and the 4th trigger mode, in other words, anti-phase in the direction of the voltage of the mid point E of U mutually cold (the 3rd) trigger mode (is the positions of 150 degree by the scale among the figure) back electromotive force exactly, perhaps, the voltage inversion of same mid point F (positions of 330 degree) back electromotive force in the 6th trigger mode.And, when this E point, when the F point loads to rotor 21, just little by little move to the 2nd trigger mode (perhaps the 5th pattern), when motor starting, the E point, F o'clock before the 2nd trigger mode (perhaps the 5th trigger mode) finishes, owing to for example depart between the rotation of the reality of trigger mode and rotor 21 in the direction change etc. of the current potential of the position back electromotive force of 120 degree or 280 degree by the scale among the figure, so, made the triggered time of three-phase inverting circuit 2 corresponding with the rotation status of rotor 21 by microcomputer equal controller 7, the signal with optimal mode offers stator coil in case of necessity.

The change point of the direction of the current potential of back electromotive force (after, be called current potential direction change point), except the E point of U phase, F point, in the embodiment shown in fig. 3, can also get and depart from E1 point, the F1 point that 120 degree are arranged on the V phase on the stator 4 mutually with U and detect, and departing from W that 240 degree are provided with equally also can get the E2 point in mutually, the F2 point detects, current potential direction change point according to each phase carries out computing, and according to the conduction time of its result control to each stator coil, in other words, control the switching of each pattern and exactly to conduction time of three-phase inverting circuit 2.

But, short of too heavy load, because rotor has inertia, needn't carry out the detection of rotor-position by every rotation 60 degree, so, in the following description, device is simplified, adopted the current potential direction change point with per 120 degree is that benchmark is determined the mode to the time that three-phase inverting circuit 2 outputs trigger, also not influence in practicality.

Be added in load on the motor when lighter, no matter in which coil of U phase, V phase, W phase, can per 360 degree be 1 week of rotor revolution to detect a current potential direction change point, and carry out anti-phase control according to this signal, in the following description, illustrate that the detection signal according to the position of rotation in 1/3 week of revolution (revolution 120 degree) triggers the situation of control to each the transistor Tr 1～Tr6 that constitutes three-phase inverting circuit 2.

In Fig. 2, CC detects the voltage direction change point and as the circuit of the input terminal I 1 of the position signalling input microcomputer 7 of rotor 21 according to the back electromotive force that produces among each stator coil U, V, the W, and is suitable with the input circuit of position detector 8 shown in Figure 1.

The 28th, the protective circuit that the back electromotive force protective transistor Tr1～Tr6 that produces when utilizing stator coil U, V, W energising uses, 29,30,31 is inverting amplifiers that an end is connected with the base stage of transistor Tr 1, Tr2, Tr3, the other end is connected with the lead-out terminal 01,02,03 of microcomputer 7.

The 32nd, to the power supply input resistor of transistor 22,23,24 supply base biases.33, the 34th, the input terminal of microcomputer 7 is connected with direct voltage testing circuit 5 and ac voltage detection circuit 6 respectively.35, the 36th, the input terminal of microcomputer 7.

Fig. 4 is the variation of the voltage of for example terminal U shown in Figure 2.Among the figure, I be continue to keep the 1st pattern shown in Figure 3 and the 2nd pattern during, during this period, rotor rotation 120 degree.II is kept during the 3rd pattern, rotor rotation 60 degree.During III continues to keep the 4th pattern and the 5th pattern and continues and keep, rotor rotation 120 degree.IV is kept during the 6th pattern, rotor rotation 60 degree.Therefore, change 1 week of rotor rotation (360 degree) by I → II → III → IV.After IV, proceed I once more, after, just reiteration carries out I → II → III → IV → I.

During I, keep the 1st pattern and the 2nd pattern.Therefore, during this period, transistor Tr 1 conducting continuously, transistor Tr 4 is ended continuously, and simultaneously, the some conductings among transistor Tr 5, the Tr6 are so the direct voltage that motor driven is used is added on the terminal U by transistor Tr 1.That is, during I, owing to direct voltage is added on the terminal U, so, can not detect the variation of back electromotive force, the voltage of terminal U is the voltage level of DC power supply.

During II, keep the 3rd pattern.Therefore, transistor Tr 1, transistor Tr 4 are ended continuously, so in fact terminal U is in open state, stator coil U is in non-conductive state.That is, the input impedance of circuit CC shown in Figure 2 is very big, so, can make the variation of the back electromotive force that in this stator coil U, produces consistent, thereby can detect at terminal U with the rotation of rotor.

The intersection point of this back electromotive force and neutral point voltage is an E point during this period.As shown in Figure 3, at this E point, the voltage that the output of circuit CC promptly is added on the position detector 8 takes place anti-phase.

During III, keep the 4th pattern and the 5th pattern.Therefore, during this period, transistor Tr 1 is ended continuously, transistor Tr 4 conducting continuously, and simultaneously, the some conductings among transistor Tr 2, the Tr3 are so terminal U is connected with the negative terminal of the direct voltage of the driving usefulness of motor by transistor Tr 2 or Tr3.That is, during III, owing to direct voltage is added on the terminal U, so, can not detect the variation of back electromotive force, the voltage of terminal U is the negative terminal voltage of DC power supply.

During IV, keep the 6th pattern.Therefore, transistor Tr 1, transistor Tr 4 are ended continuously, so in fact terminal U is in open state, stator coil U is in non-conductive state.That is, the input impedance of circuit CC is very big, so, can make the variation of the back electromotive force that in this stator coil U, produces consistent, thereby can detect at terminal U with the rotation of rotor.The intersection point of this back electromotive force and neutral point voltage is a F point during this period.As shown in Figure 3, at this F point, the output of circuit CC takes place anti-phase.

During the II and during the IV, the polarity of magnet changes with the rotation of rotor, and the change direction of back electromotive force takes place positive and negative anti-phase.

In this Fig. 4, T1, T2, T3 are called anti-phase time, actuation duration, stand-by time again.As known in the figure, the time of T1+T3 is from the time that beginning during the II ordered to E, the time that T2 finishes during from the E point to II.Begin after the time, will change into the 4th pattern from the 3rd pattern from this E point when anti-phase (output of circuit CC take place) to the powered-on mode of stator coil through T2.Like this, take place to begin through T2 to change powered-on mode after the time when anti-phase from the output of circuit CC to stator coil.

By Fig. 3 (d) as can be known, when using circuit CC, in each powered-on mode (the 1st pattern～the 6th pattern), the moment that the output of back electromotive force changes respectively has 1 time.That is, in the 1st pattern the E2 point, in the 2nd pattern the F1 point, in the 3rd pattern the E point, in the 4th pattern the F2 point, in the 5th pattern the E1 point, in the 6th pattern the F point.

Therefore, in the pattern of switching on now, take place through T2 after the time, by carrying out powered-on mode is changed into the action of next powered-on mode repeatedly the anti-phase moment from the output of circuit CC, powered-on mode changes continuously, just can make the rotor rotation of motor.

The time of T1, T2, T3, logically when zero load () is (T1+T3)=T2.That is, as shown in Figure 3, the anti-phase moment takes place in the output of circuit CC is the constantly middle of each pattern.

But, in fact when loading with motor driven, as shown in Figure 4, (T1+T3)＞T2.That is, (T1+T3)=kT2.This k value is set optimum value according to size, the rotating speed of motor and the running efficiency on the electric motor structure etc. of the load that is connected with motor.

When real-world operation, according to the rotating speed of reality the value of obtaining according to the size of load etc. is revised the back and use.Like this, just, in the time of can improving motor and quicken or the running efficiency in when deceleration.K makes T2 and T1 is roughly the same and set value less than the scope of T1.The time of this T2 is to be obtained by microcomputer 7 computings according to the time of T1+T3.

Therefore, as long as obtain the time of T1+T3, the time till promptly obtaining output and changing, just can obtain time of T2 from energising zero hour of present pattern to circuit CC.The interior dress timer of time till output from zero hour of present pattern to circuit CC changes by microcomputer 7 carries out timing.The change of powered-on mode changes transistorized ON/OFF combination by microcomputer 7 and carries out, the zero hour of powered-on mode is by this microcomputer storage, the variation of the output of circuit CC can be learnt according to the variation of the voltage of the input terminal 11～12 of microcomputer 7, so microcomputer 7 can carry out timing to the above-mentioned time.

T3 is a stand-by time, uses when motor starting, sets initial value when motor starting.Rotor no longer rotated when motor stopped, and did not produce back electromotive force.That is, the output of circuit CC does not change, and can not obtain the above-mentioned time, so, be virtual set point.Therefore, after motor starting finished, this T3 time was 0.That is, under stable state, the relation of T2=kT1 is set up.

Below, the action when starting is described.Power of electric motor is big more, and the T3 time that needs is long more, and in addition, the design speed during starting is high more, and the T3 time that needs is short more.That is, must set optimum value to each motor.In the following description, suppose stand-by time T3 is set at 1 second.

When beginning to switch on, from powered-on mode begin guarantee at least more than 1 second to the time (T1+T3) that the output of circuit CC changes.

In addition, when the variation of output that can not testing circuit CC,, then become (T1+T3)=1+ α second, when the variation of output that can not testing circuit CC, as previously mentioned, also can obtain the T2 time by calculating if use the higher limit of T1.At this moment, when for example arriving the moment that E orders when the timing of T1 time reaches higher limit, just begin the timing of T2 time.

Therefore, when finishing, the timing of T2 time just powered-on mode can be changed into next pattern.The state of variation that can not detect the output of this circuit CC is equivalent to the non-rotary state of rotor.Like this, even rotor does not rotate and can change powered-on mode during motor starting.

This state continuance to the position of stopping the rotation of rotor when consistent with powered-on mode till (maximum in 6 powered-on mode).Usually, in DC motor, for the anglec of rotation (Distribution of Magnetic Field of permanent magnet) of rotor, when not with suitable powered-on mode at once, rotor does not just rotate.

In other words, when motor starting, if the position of rotation of rotor and powered-on mode are inconsistent, just then rotor does not rotate.Change powered-on mode forcibly, with till powered-on mode is consistent, change the needed time of this powered-on mode to set according to T3 until the position of rotation of rotor.

Below, illustrate that the position of rotation of rotor is consistent with powered-on mode, begin the rotation back to becoming stable state (proceed-to-send) from rotor.From the energising of this pattern, at first begin to carry out the timing of T3 time, the time T 1 of counting till from timing finish time of T3 time to E point (output of circuit CC changes).Begin to carry out the timing of T2 in the moment that E is ordered, after the timing of T2 time finishes, powered-on mode is changed to next pattern.After, constantly reduce the value of T3 and carry out this action repeatedly.

Fig. 5 is the action flow chart when fruit is with above action in the motor of reality.In the flow chart in Fig. 5 left side, at first carry out initial setting (initial setting of microprocessor), then, carry out transistorized energising in pattern 1 (the 1st powered-on mode).

Then, carry out the described Timing Processing in back, after this, carry out transistorized energising in pattern 2 (the 2nd powered-on mode).Then, carry out the described Timing Processing in back ... carry out transistorized energising in pattern 6 (the 6th powered-on mode).……。Like this, after carrying out Timing Processing, just change the action of powered-on mode later on repeatedly.

In the flow chart of the Timing Processing shown in Fig. 5 right side, at first begin to carry out the timing of timer T3, guarantee the T3 time, then, when passing through the timing of T3 time, stop timing device T3, then just begin to carry out the timing of timer T1, thus the time T 1 of the input of counting circuit CC (till when the output of circuit CC changes).

At this moment, carry out the assignment of T3=(T3-1) and handle, the value of T3 is reduced.(establish T3=1 second=1000 millisecond.In addition, reduction is not limited to 1, also can be taken as 20～50.) in addition, to the timing time capping value (being approximately 3 times the value of T3 time) of timer T1, when not having the input of circuit CC, the timing of stop timing device T1 enters next procedure when this higher limit.

Therefore, begin to carry out the timing of timer T2 according to the input of circuit CC or the timing end face of timer T1.

The timing time of this timer T2 is calculated by microprocessor the time (the perhaps upper limit time of timing T1) of timer T1 timing be multiply by k times time and obtains and set timer T2.

When starting, short when the T2 time ratio is stablized, thus make rotating magnetic field mutually leading with respect to the position of the rotation of rotor.Therefore, become kT1 (not being k (T1+T3)), do not change the k value and just can change position leading amount mutually when stable in when starting by making the T2 time.That is, do not add the T3 time, the T2 time is shortened, just can make the position of rotating magnetic field mutually leading.When the timing of timer T2 finished, Timing Processing finished, and will change into next powered-on mode to transistorized powered-on mode.

In addition, in flow chart shown in Figure 5, before rotor begins rotation, also carry out the subtraction of T3 time, still, for the value of T3, its reduction is little, and this subtraction carries out at most 6 times, in each powered-on mode, always can guarantee the conduction time of appointment, so, no problem when reality is started, be expected to make process simplification.

Owing to carry out the switching of powered-on mode like this, so stand-by time T3 little by little shortens with starting, when the rotation of rotor 21 became stable speed, stand-by time T3 just became 0.In addition, after motor starting to becoming stable rotating speed, the speed of rotor 21 increases gradually, so, the time T 1 of the current potential direction change point E that the direction of the back electromotive force that produces in the arrival stator coil changes, thereby actuation duration T2 also shortens gradually again, the result, just have the time that provides the size that is added in epitrochanterian load and make the rotating speed of the moving current balance type of coil midstream to the conduction time of coil (T1+T2+T3) in each pattern, carry out each phase 120 degree repeatedly and rotate forwards energising, 60 degree rotation stopping energisings, 120 degree rotation energisings in the other direction and 60 degree rotation stopping such circulations of switching on.

Fig. 6 is a waveform of supplying with the ON/OFF signal of transistor Tr 1～Tr6 when making Spin Control portion shown in Figure 1 (speed detector 11, difference arithmetic unit 12, chopping signal maker 13) effectively.This figure is corresponding with pattern and transistor among Fig. 3 (b).

Among the figure, the scope that is called ON is the scope of transistor conducting always, the scope that is called PWM is the transistor scope of conduction and cut-off periodically, the state of its conduction and cut-off is shown in the below of Fig. 6, press designated period Tt conduction and cut-off repeatedly, ON time Ton is regulated by speed detector 11, difference arithmetic unit 12 and chopping signal maker 13.When time expand Ton, just increase direct current, thereby the rotating speed of rotor increases to the stator coil energising; When shortening time T on, just reduce direct current, thereby the rotating speed of rotor reduces to the stator coil energising.Therefore, by regulating this time T on, the just rotating speed of may command rotor.

Poor according to from the signal of the expression rotating speed of speed detector 11 outputs and the speed command of supplying with from the outside of difference arithmetic unit 12 supplied with switching signal (changing the switching signal of for example 5KHz of conducting load in the scope 0～100%) after being overregulated by 13 couples of time T on of chopping signal maker to energising controller 10.This energising controller 10 utilizes this switching signal making the ON signal during transistor is in back spend for half 60 in conduction period (120 degree) become on-off state as shown in Figure 6.

Fig. 7 is the flow chart that the friendship of conducting load is more moved, and is the interior run of whole action that is included in microcomputer 7, only shows the part of regulating time T among the figure.Among the figure, S1 at first judges the change that has or not speed command in the step, when the change of speed command, just enters step S2, resets speed setting value Ns.In addition, limit Ns and when beginning, set initial value.

Then, enter step S3, the actual speed Nt of the rotor of input speed detector 11, in the step S4 size of speed setting value Ns and actual speed Nt relatively, when Nt＞Ns, S5 judges the condition of Nt-Ns＞10 in the step, carries out the processing of step S6 or step S7.S6 subtracts 1 with the value of time T in the step, carries out the assignment of Ton=Ton-1 and handles, and at step S7 the value of time T on is subtracted 10, carries out the assignment of Ton=Ton-10 and handles.

Therefore, when actual speed Nt is far longer than speed setting value Ns, just reduce time T on widely, thereby reduce the rotating speed of rotor.In addition, the unit " 1 " that the correction of time T on is used is set at 2 microseconds as one embodiment of the present of invention, still, is not limited to this.

Then,, when Nt＜Ns, and then judge the condition of Nt-Ns＜10, carry out the processing of step S10 or step S11 at step S9 in the step S8 size of speed setting value Ns and actual speed Nt relatively.S10 adds 1 with the value of time T in the step, carries out the assignment of Ton=Ton+1 and handles, and at step S11 the value of time T on is added 10, carries out the assignment of Ton=Ton+10 and handles.

Therefore, when actual speed Nt is far smaller than speed setting value Ns, just reduce time T on widely, thereby reduce the rotating speed of rotor.In addition, the unit " 1 " that the correction of time T on is used, the same during with Nt＞Ns, be set at 2 microseconds.

The correction of the time T on that carries out of action by step S4～step S11 is suitable with difference arithmetic unit 12.

Therefore, when Nt＞Ns, Nt＜Ns,, when Nt=Ns, do not change time T on, then, enter step S12, generate the switching signal of conducting load by chopping signal maker 13 with time T at each step correction time Ton.This switching signal is supplied with energising controller 10, and the rotating speed of rotor 21 is controlled to be the rotating speed corresponding with speed command.

Fig. 8 is the flow chart of the action of corrector 14 shown in Figure 1, is the run that is included in the whole action of microcomputer 7, only shows the part of the k value of regulating timing signal maker 9 (are called among Fig. 1 in turn regularly square) among the figure.In above-mentioned explanation when this k value obtains timing signal, be to use the value that makes (T1+T3)=kT2, set optimum value according to the size of the load that is connected with motor, the rotating speed of motor and the running efficiency on the electric motor structure etc.

Among the figure, from speed detector 11 input actual speed Nt, compare, ask the underspeeding of rotating speed of rotor with the rotating speed of the rotor of input last time at S20.Underspeed (to the pace of change of negative direction) of rotating speed can be used the underspeeding of rotating speed of each fixed time, execution circulation timei of perhaps using each input flow chart shown in Figure 8 tachometer value during actual speed Nt fixedly the time.For example, an embodiment is shown, judge for obtain every designated period 20 rotational speed N t of input this period rotational speed N t the gradient of first approximation formula whether greater than designated value.

In addition, this designated value decided according to the time of implementation of 1 circulation in the flow chart that changes time T on shown in Figure 7, be set at than the circulation of the rotating speed control of rotor short during the speed of rotor.

The direct voltage that obtains from direct voltage testing circuit 5 in step S22 input is at step S23 with go on foot that S21 is the same to judge the underspeeding whether greater than designated value of direct voltage.

Equally, the alternating voltage that obtains from ac voltage detection circuit 6 in step S24 input is at step S24 with go on foot that S21 is the same to judge the underspeeding whether greater than designated value of alternating voltage.

Then, after satisfying step S21, step S23, when going on foot the condition of S25, just enter step S26, step S27, at first present k value being stored in the memory KM, the k value is changed into k=k * 0.9, make the generation of the timing signal of timing signal maker 11 shift to an earlier date 10% constantly.

When not satisfying the condition of step S21, step S23, step S25, just enter step S28, make the k value be k=KM, revert to the value that is stored in the memory KM.In addition because KM is a value of when beginning setting KM=k, so, do not satisfy step S21, step S23, step S25 during in, k value does not change, only ability is changed into k=k * 0.9 with the k value during the condition that satisfies step S21, step S23, step S25.

Therefore, when satisfying step S21, step S23, step S25, the generation of timing signal just shifts to an earlier date constantly, the rotating speed of rotor is to the adjustment in direction of accelerating, then, and when the time T on by rotational speed governor control switch signal prolongs, when the direction of the rotating speed increase that makes rotor is controlled, underspeeding of the rotating speed of rotor just reduces, so the value of k reverts to original value.

That is,, the initial response characteristics of rotating speed control can be improved, thereby the rotation speed change of the rotor of fluctuating noise root can be suppressed to become by revising this k value.

Fig. 9 is the concrete circuit diagram of circuit CC shown in Figure 2.Among the figure, 41～43rd, the resistance that resistance value is identical, their end are connected with terminal U, the V, the W that power to stator coil respectively, and the other end is connected with ground level by resistance 44.Therefore, the voltage that is added on each stator coil U, V, the W just carries out dividing potential drop by these resistance 41～44 in the ratio of appointment, and to be set in the induced voltage that produces in the stator coil of non-energising be the positive and negative variation in boundary with DC2.5V.

45, the 46th, the divider resistance of generation reference voltage, its voltage ratio is identical with the voltage ratio of resistance 41 with resistance 44.For example, the resistance value of resistance 45 is identical with resistance 44, and the resistance value of resistance 46 is identical with resistance 41, owing to be added on the bleeder circuit of this

resistance

45,46 from the direct current 280V of power circuit 3 supplies, so the reference voltage of generation is DC2.5V.

The 47th, comparator carries out the induced voltage of dividing potential drop and the reference voltage that generated by

resistance

45,46 is added on this comparator 47 by resistance 41～44.This comparator 47 is the size of these voltages relatively, and to microcomputer 7 output high level (DC5V) or low level (0V) signals.In addition, the 48th, the output resistance of comparator is connected with the DC power supply of DC5V.The induced voltage and the reference voltage that utilize resistance to carry out dividing potential drop are defeated by microcomputer 7 respectively.

Figure 10 is the oscillogram of variation of expression induced voltage, is the oscillogram after induced voltage and applied voltage shown in Figure 3 are synthesized.Promptly, it is the waveform of the terminal voltage of the terminal U, the V that connect of stator coil, W, solid line shown in each U, V, the W is to be the waveform of the applied voltage of the positive and negative variation in center with DC140V, waveform shown in the dotted line is the waveform of induced voltage, when voltage is not added on the stator coil, can not buried by applied voltage.

VV is the waveform of the voltage on non-inverting input that is added on the comparator 47.Because the applied voltage of positive 140V and the applied voltage of negative 140V are cancelled out each other, so, have only the induced voltage part to obtain serially.

If being added to the waveform of the induced voltage on non-inverting input of comparator 47 is symbol 50, be added to reference voltage on the reversed input terminal of comparator 47 is that the theoretic reference voltage of symbol 52, the error of not considering resistance 41～56 is a symbol 51, the correct signal of then supplying with timing signal maker 9 is exactly the signal that obtains according to the result that the size to the waveform 50 of induced voltage and reference voltage 51 compares.That is, it is the signal in the moment output of representing with TX.

But because actual reference voltage is the reference voltage of having considered after the error of resistance 52, signal is in the output of the moment of T2, so, will carry out the moment of the correct signal that obtains after the following correction and supply with timing signal maker 9.That is, the signal that in fact will represent the moment of signal is supplied with timing signal maker 9.Timing signal maker 9 is to generate the timer clock that switches to the energising of stator coil accordingly as described above with this moment.

In Figure 10, TS, T0, T2 are the moment that the size from the signal of comparator 47 output changes.Therefore, the time in 1 cycle of the waveform of this induced voltage is t0+t1.In addition, T1 is the moment of the centre of moment T0 and T2 constantly, and is as long as too big variation does not take place holding time of powered-on mode of front and back, just constantly consistent with the peak swing of induced voltage, so TX passes through moment after time in 1/4 cycle of induced voltage constantly from T1.

Therefore, as long as obtain the time in 1 cycle of induced voltage according to moment TS and moment T2, and according to moment T0 and constantly T2 obtain T1 constantly, just can utilize TX=(T2-(1/2) * (T2-T0))+(1/4) * (T2-TS) to ask TX constantly, in addition, utilizing TX=(T0+ (1/2) * (T2-T0))+(1/4) * (T2-TS) to ask TX, in fact also is identical.And then, if obtain the time (t0+t1) in 1 cycle of the peak swing moment corresponding T1 of induced voltage and induced voltage, also can utilize TX=T1+ (1/4) * (t0+t1) to ask TX constantly.

Figure 11 is used to ask the flow chart of TX constantly, is the interior run of whole action that is included in microcomputer 7, still, only shows and asks the part of TX constantly.

At first, judge at S30 whether the output of comparator 47 size variation takes place.That is, judge whether output (high level voltage, low level voltage) that the big or small comparative result according to non-inverting input that is added to comparator 47 and the voltage on the reversed input terminal obtains the variation of high level voltage → low level voltage or low level voltage → high level voltage takes place.

When satisfying the judgement of step S30, just enter step S31, order transmits TS, T0, T2 constantly.That is,, store T0 into TS constantly, then,, store T2 into T0 constantly for T2 → T0 for T0 → TS.In addition, the previously stored moment TS of cancellation.Then, store present moment (moment that step S30 judges) into T2 constantly.

Then, utilizing constantly at step S32, TS, T0, T2 carry out by (TX is constantly asked in the computing shown in the TX=(T2-(1/2) * (T2-T0)+(1/4) * (T2-TS)).Then, should export to timing signal maker 9 by moment TX at step S33.Timing signal maker 9 is asked the energising switching instant to stator coil as described above according to this moment TX.

Figure 12 is used to ask the flow chart of other embodiment of TX constantly, and is the same with flow chart shown in Figure 11, is the interior run of whole action that is included in microcomputer 7, still, only shows and asks the part of TX constantly.

At first, judged whether to detect the peak swing value of induced voltage at step S40.The variation of induced voltage is asked in the variation of induced voltage according to by electric resistance partial pressure shown in Figure 9 the time.The variation that is added to the induced voltage on the microcomputer 7 is carried out the A/D conversion every designated period (about 100 microseconds), writes down the variation of induced voltage, asks the maximum and the minimum value of induced voltage.

When predicating peak swing (maximum or minimum value), just enter step S41, order transmits TM, T1 constantly.That is,, store T1 into TM constantly for T1 → TM, and the previously stored moment TM of cancellation.Then, store present moment (moment that step S40 judges) into T1 constantly.

Then, carry out by the computing shown in (TX=T1+ (1/4) * (t0+t1)), ask TX constantly at step S42 the utilization moment TM, T1.

Then, should export to timing signal maker 9 by moment TX at step S43.Timing signal maker 9 is asked energising switching instant to stator coil as described above according to this moment TX.

Like this, in position detector, just can eliminate the resistance error of the divider resistance that position detecting circuit uses, make the judgement of position probing more accurate, thereby can suppress owing to depart from caused vibration and noise to what the energising of stator coil was switched.

In addition, in the present embodiment, as shown in Figure 6, owing to carry out copped wave during the back is spent for half 60 in during the energisings of 120 degree, so, when this copped wave is consistent with the waveform of the induced voltage of Figure 10, for example, in pattern 2, owing to have only U to carry out copped wave mutually, so U can not cancel out each other with W applied voltage mutually mutually, induced voltage is by the copped wave of above-mentioned chopped waveform institute.

Figure 13 is the oscillogram that the induction voltage waveform after this copped wave is carried out in expression.As shown in the drawing, owing to induced voltage occurs intermittently, so, when induced voltage not occurring, just detect less than induced voltage.Therefore, because the variation of the output of comparator 47 only just changes when induced voltage occurring, so, when induced voltage not occurring, even the output of comparator 47 changed originally, but before induced voltage occurring during the output of comparator 47 change to lag behind.

The chopping cycle of induced voltage is synchronous with chopping signal as mentioned above, so, maximum lag time that the output of comparator 47 changes also only is short to and is about 200 microseconds (frequency of establishing chopping signal is 5KHz), for example, because all outputs that are not comparator 47 all postpone, so, no problem concerning the rotation of common rotor.

Figure 14 is that expression is because the key diagram that departs from of the output change location of the comparator 47 that the copped wave of induced voltage causes.In the figure, YS1 is to be the chopping signal of (TS2-moment TS0 constantly) time in the cycle, is high level voltage from moment TS0 to moment TS1, is low level voltage from moment TS1 to moment TS2, after, high level voltage and low level voltage alternately changed repeatedly by this cycle.

Y1 is the waveform of induced voltage, and the waveform when being chopping signal YS1 occurs induced voltage during for high level voltage at chopping signal YS1.In addition, when use negative circuit etc. made chopping signal anti-phase, the anti-phase of correspondence took place in high level voltage and low level voltage.

For reference voltage, it is corresponding with moment S0 that anti-phase correct detection position takes place for the output of comparator 47, and on the contrary, in fact moment of changing of the output of comparator 47 is at moment S1, for correct moment S0, a period of time of lagged behind (S1-moment S0 constantly).

Like this, the detection signal of comparator 47 postpones, and just makes the cycle (cycle of induced voltage) of chopping signal YS1 and rotor consistent, and, do not occur induced voltage during be exactly correct detection position S0 input in.

YS2 makes the position depart from the chopping signal of 180 degree (during the high level voltage of chopping signal with low level voltage during when respectively accounting for 50% conducting load) with respect to chopping signal YS1, except depart from mutually the position, YS1 is identical with chopping signal, represents the waveform of the induced voltage corresponding with this chopping signal YS2 with Y2.Utilize the waveform of induced voltage Y2, can change its output at correct moment S0 comparator 47.

Therefore, do not occur induced voltage during, if make chopping signal the position depart from mutually, induced voltage will appear, so, can carry out correct position probing.

Figure 15 is the flow chart that is used to make the phase place of chopping signal to depart from, and the phase place of chopping signal is departed from after the electric angle of rotor (to the switching timing of the powered-on mode of stator coil constantly) is consistent.Like this, by moving 1 week of rotor revolution or several weeks phase place being departed from, the moment (the perhaps moment of the output change delay of comparator 47) that can make comparator 47 that output is changed disperses fifty-fifty, just can suppress because the parasitic oscillation that departs from caused control circuit of the output delay in long period and the abnormal vibrations of rotor etc.

This flow chart is to have increased step S50 to form between the step of the step of " pattern 4 " of flow chart shown in Figure 5 and " Timing Processing ".In this step S50,, the phase place of chopping signal is become " 0 " to chopping signal maker 13 output signals.Therefore, from " pattern 4 " (electric angle departs from the position of 180 degree), the phase place of chopping signal departs from 180 degree with electric angle.

In addition, the position that phase place is departed from is not limited to the position of 180 degree, can suitably set, and its effect is constant.

Motor of the present invention has rotor, a plurality of stator coil and energising controller, and rotor has a plurality of magnetic poles; A plurality of stator coils produce magnetic field to this rotor; The energising controller switches the galvanic energising of carrying out to above-mentioned stator coil according to the signal that the size variation of induced voltage that is periodically produced by being rotated in the said stator coil of above-mentioned rotor and reference voltage generates according to predetermined mode sequence.In this motor, has position detector, this position detector carries out electric resistance partial pressure from the reference voltage that obtained by electric resistance partial pressure with above-mentioned induced voltage and moment that the size of the correction voltage that obtains changes, the time of certain the big or small state that before above-mentioned correction voltage swing changes, keeps 1/2 before the moment add that moment of time in 1/4 cycle of correction voltage exports above-mentioned signal, so, can suppress because the generation of the signal that the error of the used resistance of electric resistance partial pressure causes departing from constantly.

In addition, motor of the present invention has rotor, threephase stator coil and energising controller, and rotor has a plurality of magnetic poles; The threephase stator coil produces magnetic field to this rotor, is Y-connection; The energising controller switches the galvanic energising of carrying out to above-mentioned stator coil according to the signal that the size variation of the neutral point voltage of induced voltage that is periodically produced by being rotated in the said stator coil of above-mentioned rotor and said stator coil generates according to predetermined mode sequence.In this motor, has position detector, the reference voltage that this position detector obtains from above-mentioned neutral point voltage is carried out electric resistance partial pressure and above-mentioned induced voltage carried out electric resistance partial pressure and moment that the size of the correction voltage that obtains changes, the time of certain size state that before above-mentioned correction voltage swing changes, keeps 1/2 before the moment add that moment of time in 1/4 cycle of correction voltage exports above-mentioned signal, so, can suppress because the generation of the signal that the error of the used resistance of electric resistance partial pressure causes departing from constantly.

In addition, motor of the present invention has rotor, a plurality of stator coil and energising controller, and rotor has a plurality of magnetic poles; A plurality of stator coils produce magnetic field to this rotor; The energising controller switches the galvanic energising of carrying out to above-mentioned stator coil according to the signal that the size variation of induced voltage that is periodically produced by being rotated in the said stator coil of above-mentioned rotor and reference voltage generates according to predetermined mode sequence.In this motor, has position detector, this position detector carries out electric resistance partial pressure from the reference voltage that obtained by electric resistance partial pressure with above-mentioned induced voltage and moment that the size of the correction voltage that obtains changes, moment during the above-mentioned correction voltage peak swing of the said reference voltage during certain size state that kept before changing with respect to above-mentioned correction voltage swing adds that moment of time in 1/4 cycle of above-mentioned correction voltage exports above-mentioned signal, so, can suppress because the generation of the signal that the error of the used resistance of electric resistance partial pressure causes departing from constantly.

In addition, motor of the present invention has rotor, threephase stator coil and energising controller, and rotor has a plurality of magnetic poles; The threephase stator coil produces magnetic field to this rotor, is Y-connection; The energising controller switches the galvanic energising of carrying out to above-mentioned stator coil according to the signal that the size variation of the neutral point voltage of induced voltage that is periodically produced by being rotated in the said stator coil of above-mentioned rotor and said stator coil generates according to predetermined mode sequence.In this motor, has position detector, the reference voltage that this position detector obtains from above-mentioned neutral point voltage is carried out electric resistance partial pressure and above-mentioned induced voltage carried out electric resistance partial pressure and moment that the size of the correction voltage that obtains changes, moment during the above-mentioned correction voltage peak swing of the said reference voltage during certain size state that kept before changing with respect to above-mentioned correction voltage swing adds that moment of time in 1/4 cycle of above-mentioned correction voltage exports above-mentioned signal, so, can suppress because the generation of the signal that the error of the used resistance of electric resistance partial pressure causes departing from constantly.

In addition, motor of the present invention, in said structure, have neutral point voltage with the threephase stator coil of Y-connection and be replaced into 1/2 circuit of the galvanic voltage that is added on the said stator coil, so, needn't directly draw neutral point voltage from stator coil and just can generate reference voltage at an easy rate.

Claims

1. motor has:

A rotor has a plurality of magnetic poles;

A plurality of stator coils produce magnetic pole to described rotor;

An energising controller, the signal that produces when induced voltage that periodically produces at described stator coil when rotating according to above-mentioned rotor and reference voltage size variation switches the galvanization in the described stator coil successively with predetermined pattern;

It is characterized in that, it is equipped with a position detector, the moment that the size of the correction voltage that reference voltage that described position detector draws from electric resistance partial pressure and described induced voltage draw through electric resistance partial pressure changes, before the size variation of described correction voltage, keep any one used time of state in big or little 1/2 before the moment add and revise the voltage moment of 1/4 cycle time, export described signal.

2. motor as claimed in claim 1 is characterized in that, described a plurality of stator coils are by Y-connection, and described reference voltage is the central point voltage of described stator coil.

3. motor as claimed in claim 2 is characterized in that, it has neutral point voltage with the threephase stator coil of Y-connection and is replaced as 1/2 circuit that is added to the direct voltage of described stator coil.