CN102739139B - Rear electromagnetic force detection circuit - Google Patents

Rear electromagnetic force detection circuit Download PDF

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Publication number
CN102739139B
CN102739139B CN201210096126.4A CN201210096126A CN102739139B CN 102739139 B CN102739139 B CN 102739139B CN 201210096126 A CN201210096126 A CN 201210096126A CN 102739139 B CN102739139 B CN 102739139B
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motor
electromagnetic force
voltage
phase
force voltage
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CN102739139A (en
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尼尔斯·佩德森
克里斯汀·斯文森
波·拓兰克尔·彼得森
汉斯·朗贝格·泽伦森
杰普·默勒·荷姆
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Secop GmbH
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/14Electronic commutators
    • H02P6/16Circuit arrangements for detecting position
    • H02P6/18Circuit arrangements for detecting position without separate position detecting elements
    • H02P6/182Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

The invention discloses a kind of rear electromagnetic force detection circuit.The present invention relates to a kind of for detecting the method and apparatus of the position of the rotor (5) of motor (11).Described method is by the electromagnetic force voltage (e to motor phase (3a, 3b, 3c) a, e b, e c) carry out sampling and detect described rear electromagnetic force voltage (e a, e b, e c) the intersection point of particular voltage levels use the rear electromagnetic force voltage (e of the motor phase (3a, 3b, 3c) of described motor (5) a, e b, e c) detect, wherein the phase (3a, 3b, 3c) of motor (5) is connected to each other by public convergence point (12,15).Motor phase (3a, 3b, 3c) by electric decoupling device (16) partly with described convergence point (12,15) electrolysis coupling.

Description

Rear electromagnetic force detection circuit
Technical field
The present invention relates to a kind of method detecting the position of the rotor of motor.The invention still further relates to a kind of circuit that can detect described position.
Background technology
In order to control brushless DC motor 11 (BLDCM), need the position of the rotor 5 knowing machine 1.Transducer can be used to find the position of rotor 5.Due to very harsh environment and due to price, in the application of compressor, this is unpractical.Another way is no sensor method.In compressor industry, the detection scheme without transducer used widely is " direct BEMF method (directly electromagnetic force method) ", wherein by reading the motor feedback signal 2 according to Fig. 1, detect the zero crossing of responded to machine voltage.
Fig. 1 is presented at the motor feedback signal 2 that machine (motor) phase 3 directly reads.Feedback signal 2 is processed by control unit 4, for determining the transform sequence be applicable to motor 11.
For " direct BEMF method " (after BEMF=the electromagnetic force) that show in Fig. 1, the position of rotor 5 can be read for every 60 electrical degree intervals.Present the model 7 (representational equivalent circuit) of BLDCM in fig. 2, demonstrate the model 7 of three-phase full-bridge inverter 8 and BLDCM.Induced voltage is by with e a, e band e crepresent.
Two strategies that are conducted are utilized to carry out the driving of BLDCM11.This means that two-phase 3a, 3b, 3c are conducting electricity in a flash ideally.In fact, this is not right-on.Between the commutation period between facies-suite, all three-phase 3a, 3b, 3c are in a short time period conducting.Its reason is that magnetic energy (flyback (fly-back) energy) is stored in machine inductance 9." extra " phase 3a, 3b, 3c of short time period (so-called degaussing time period) conducting after transformation plays an important role.From described phase 3a, 3b, 3c, BEMF voltage (zero crossing of BEMF) is utilized to derive the position of rotor 5.This event undergoes phase transition the time of changing for determining in fact.
Afterwards, the description of the driving to BLDCM11 is provided.To driving relevant correlating event be: the zero crossing (Z event) of BEMF voltage, convert (C event) and degaussing (D event).These events are hereafter being described.Fig. 3 shows these electric events that an electricity rotates, and is the sketch of some coherent signals when driving BLDCM11.Solid line display three-phase 3a in Fig. 3, the BEMF voltage of the motor of 3b, 3c.The phase current I of dotted line display threephase motor a, I b, I c.
The zero crossing (Z event) of Fig. 3 display three event: BEMFs relevant to the driving of BLDCM11, convert (C event) and degaussing (D event).In addition, visible, phase BEMF voltage e a, e b, e cwith phase current I a, I b, I crepeated with every 360 electrical degrees.Fig. 3 also shows every 60 electrical degrees of above-mentioned three events (i.e. Z event, C event and D event) and occurs.To the phase BEMF voltage e with trapezoidal shape a, e b, e cthe driving of BLDCM utilize 6 step modes, wherein traditionally two-phase 3a, 3b, 3c in every 60 electrical degree conductings.Provide 6 step modes in Table 1.
Table 1
Table 1 and Fig. 3 show this strategy and are injected in BLDCM11 based on by the current impulse of 120 electrical degrees.
When studying phase B, first event of visible generation is the degaussing (interval between 0 electrical degree (itself and 360 electrical degrees " identical ") and 60 electrical degrees, interval before following closely, the interval before especially between 240 and 360 electrical degrees, is wherein filled with negative current-I b).This limited degaussing interval occurs due to the stored energy in inductance 9b.Current sequence is from (+I a,-I b) (between 300 and 360 electrical degrees) come (+I a,-I c) (between 0=360 electrical degree and 60 electrical degrees).This means in this some place no longer electric current I bbe injected in phase B.Phase B inductance 9b comprises magnetic field energy.This magnetic field energy will be released (flyback effect) in three-phase full-bridge inverter 8.The destination county of degaussing can see the motor potential voltage e on BLDCM11 bjump, this is because energy path is usually by the fly-wheel diode 10 in three-phase full-bridge inverter 8, this means motor potential voltage e a, e b, e coriginally the DC link track (DC-linkrail) upper (have ignored the voltage drop on fly-wheel diode 10 in this consideration) of plus or minus is in, until each phase inductance 9a, till 9b, 9c are de-energized.When phase 3a, 3b, 3c are de-energized, each motor current potential e a, e b, e croughly be back to DC link voltage V dchalf.
The next event occurred is the BEMF voltage e of phase B bzero crossing (between 0 electrical degree and 60 electrical degrees).Easily at the motor current potential e of phase B bon see this event, this is because phase B is de-energized (do not have electric current I bflowing).Herein, the BEMF voltage e of visible B bslope rises.Zero crossing is searched.This zero crossing produces through certain electric angle (in theory at 30 electrical degree places) after conversion event.This means that current sequence is from (+I a,-I c) come (+I b,-I c), etc.Main idea is herein by electric current I in the time be applicable to a, I b, I cbe injected into mutually, for generation of the motor torque optimized.It should be noted that the power of instantaneous axis 5 can calculate with following formula herein:
Equation 1:
P shaft=I a·e a+I b·e b+I c·e c
Wherein:
I a, I band I cit is moment motor phase current (measuring with ampere [A])
E a, e band e cthe BEMF voltage (measuring with volt [V]) of each phase of moment
Can set up following table (i.e. table 2), display is used for the overall scene of the control of BLDC motor 11.
Table 2
In order to produce the motor torque of optimization, essence is that the event mentioned in table 2 is appropriately processed.Needs detection and two events making it come into force are zero crossings (Z event) of degaussing (D event) and BEMF.Conversion event (C event) is based on the zero crossing of BEMF.In order to detect and make some events come into force, need some external circuits and the processor (such as control unit 4) with built-in comparator.Use motor potential voltage e a, e b, e cand relatively process described detection between the current potential of motor convergence point 12,15.Hereafter will describe in these.
Followingly should to be renumberd:
Six step modes to be conducted strategy based on two when ignoring degaussing
The phase 3a of power-off, 3b, 3c, for detecting the zero crossing of BEMF, produce for guaranteeing the moment of torsion optimized
BEMF voltage e a, e b, e camplitude depend on machine speed.This means BEMF voltage e under the low speed of motor 11 a, e b, e clow.Therefore, be quite difficult to start BLDCM11, this is owing to losing BEMF voltage e a, e b, e c(or more accurately: BEMF voltage e a, e b, e cbe not large enough to and processed by control unit 4 with enough precision).Motor feedback signal 2 in Fig. 1 should very carefully be considered, this is because it is successful key when detecting the zero crossing of BEMF.Hereafter providing some examples of motor feedback signal 2:
The example of motor feedback signal
Brushless DC (BLDC) machine (motor) 11 with the new Compressor Technology of significant larger the moment of inertia is introduced into betwixt.Which results in some key issues.Especially, when adopting the known starting method of prior art, need to set up machine speed (for can with the zero crossing of enough accuracy detection BEMF voltage) by running longer duration (all As be well known in the art for the method startup stage of BLDC11 initial) with step mode.This is very crucial, because have the potential risk of the position losing rotor 5 due to the compressor load (or other exterior mechanical load) of the unknown.
The exemplary of the BEMF circuit 13 used before demonstrating in the diagram.For the circuit 13 shown in Fig. 4, from the motor feedback signal e of phase 3a, 3b, 3c a, e b, e cpassed through voltage divider 14 (R10 and R13; R11 and R14; R12 and R15) suppress.Due to the possibility of position of the operation of longer stepper pattern and " losing " rotor 5, this for these high inertia BLDCM11 be not desirable.
The possible solution of high inertia problem can be disconnect with bottom resistance (R13 in Fig. 4, R14, R15 become the R4 in Fig. 5, R5, R6), and allows control unit 4 to detect not repressed BEMF signal.Present this scheme in Figure 5.In this scheme, the detection of zero crossing synchronously completes with the pulse-width modulation (PWM) of three-phase full-bridge inverter 8 in downtime, and now the zero crossing of BEMF voltage can with reference to ground connection.Shortcoming be can not utilize 100% PWM, which show the deterioration of the maximum machine speed that can realize.
In order to obtain the PWM of (substantially) 100% with higher speed, need grounding through resistance (as it uses the R13 in Fig. 4, R14, R15 carry out) below and suppress motor feedback signal.The detection of the zero crossing of BEMF voltage will synchronously be completed with the PWM in machine run time afterwards.To be the machine convergence point 12 of the reality generated in the diagram after reference point at high speeds.
Bottom resistance (R4 in Fig. 5, R5, R6) and earthy connect/disconnect have been come via some digital pin on control unit, see the Fig. 5 of BEMF circuit demonstrating improvement.
But the startup shown in Figure 5 can not be worked, this is because the signal on EMK_A is affected by the resistance (R7 in Fig. 5, R8, R9) for generating convergence point 12 by the signal level on EMK_B or EMK_C.325VDC will be arranged on other motor phase 3a, and on one in 3b, 3c, this expects measured signal by seriously disturbing.
A kind of scheme can be that the resistance of near convergence point 12 is increased to and makes the no longer debatable level of this interference, but because the upper voltage divider resistor (R1 in Fig. 5, R2, R3) be within the scope of megohm, to limit loss, so that the resistance (R7 in Figure 5, R8, R9) of convergence point 12 needs to be that tens million of ohm is to limit described impact.By doing like this, convergence point 12 is by very responsive for the noise become coupling, and the resistance value in this scope is very unstable when it arrives in dust and moisture, therefore makes convergence point 12 unreliable.
Another program is the convergence point 15 be shifted produced as shown in Figure 6.
The loss caused by work, but is reached the twice of the loss in BEMF circuit by the scheme of Fig. 6 display, makes when the high efficiency circuit of needs that it is not attractive thus.
Third program will produce machine convergence point (starpoint) (not shown) to produce the machine convergence point 15 of movement by using DC bus voltage.But this can provide the error detection of the zero crossing to BEMF voltage potentially.
Therefore, the method for the improvement of the position of the rotor for detecting motor is still needed.Equally, the circuit of the improvement of the position of the rotor for detecting motor is needed.
Summary of the invention
Therefore, the object of this invention is to provide a kind of method of position of the rotor for detecting motor, the method is modified relative to method well known in the prior art.In addition, the object of this invention is to provide a kind of circuit that can detect the rotor-position of motor, this circuit is improved by relative to circuit well known in the prior art.
The invention solves this problem.
A kind of method performing rotor-position for detecting motor is proposed, described method by least one motor phase at least one after electromagnetic force voltage to sample and the intersection point of particular voltage levels that detects described rear electromagnetic force voltage uses the rear electromagnetic force voltage of at least one motor phase of described motor at least in part, wherein said motor is connected to each other by public convergence point, when at least one motor is had at least by least one electric decoupling device partly with described convergence point electrolysis coupling.In principle, motor can have the motor phase of any amount substantially.Exemplarily, it can have two, three, four, five, six, seven, eight, nine, ten, 11,12 or even more motor phases (wherein typical structure has even number motor phase).Can carry out in any mode well known in the prior art in fact the sampling of at least one rear electromagnetic force voltage of at least one motor phase.Such as, the change of the voltage measurement to resistance or the measurement to magnetic field (intensity) and/or magnetic field (intensity) can be conceived.Described sampling can be read by simulation and/or digital circuit and be processed.Especially, digital processing element (such as single board computer etc.) can be used.Such device also may be used for the electric current controlling to be supplied to motor.Because this is common for motor, so the difference of motor is connected to each other by public convergence point.This not necessarily means such as is made respective wire short-circuiting by (substantially) and is directly connected them.Alternatively, may be resistance or other device and/or arranged in series in parallel with respective electric wire.Convergence point self may be grounded (may by resistance etc.) and/or can be floating (by itself and earth potential being disconnected and/or having high-resistance resistor by use, such as, in the scope or even larger than it scope of megohm).According to the solution of the present invention, partly electrolysis coupling when at least one motor is had at least by least one electric decoupling device and described convergence point.Electrolysis coupling can be carried out in every way.Especially, a direction of electric current can be that preferably (extreme form will be diode, wherein preferably substantially " 100% " relative to other direction; But " less " is also preferably possible).Can also be that connection (comprising the connection in a preferably direction) is only established during the specific time interval.In addition, can be partly electrolysis coupling by the non-linear behavior of electric coupling perform (as comparison means, standard resistor show the voltage that applies and through resistor electric current linear behavior).Non-linear behavior also can comprise amplifying device (comprise in one direction be preferred amplifying device relative to other direction).Although after at least one electromagnetic force voltage be sampled and/or at least one motor has at least mutually time be partly enough in principle with convergence point electrolysis coupling, but, if multiple and/or (substantially) if all rear electromagnetic force voltage is sampled and multiple and/or motor that (substantially) is all by partly electrolysis coupling, be preferred respectively.Principle empirically, more rear electromagnetic force voltage be sampled and/or more motor by partly electrolysis coupling, position probing is better.Substantially all voltage levvls can be adopted as the voltage levvl for detecting.Especially, specified level is preferred, the level of the maximum and/or minimum voltage that such as (close) occurs.Particularly preferably, " zero crossing " is detected." zero crossing " can be zero ground level and/or the voltage levvl between two current potentials of DC voltage feedway and/or the voltage levvl between the maximum voltage level occurred respectively and minimum voltage level.Certainly, also can be other current potential.
Especially, can adopt described method, after making at least one, electromagnetic force voltage compares with reference voltage.Like this, especially simple embodiment can be conceived to.Usually, reference voltage can relatively easily be produced.Relatively relatively can carry out based on " homodyne is other ".Like this can be relatively especially accurately and/or especially simple.
Although more kinds of voltage levvl can be detected, preferably adopt described method, make the zero crossing detecting at least one rear electromagnetic force voltage described.Such zero crossing normally significantly, for determining rotor-position.For concept " zero crossing ", it not necessarily means and earthy intersection point.Alternatively, if especially use the motor with earth potential electrolysis coupling, so other current potentials can be used.If the intermediate voltage potential level between two current potentials of power supply " terminal " of DC power supply and/or AC power supplies (especially) is used as the zero potential level for being detected zero point, then can realize the embodiment be especially applicable to.
If at least one electric decoupling device described is designed to non-linear electric decoupling device at least in part, is so preferred.It may be sufficient that initial experiment has shown such non-linear behavior for improving detection.Especially, if be preferred by there is non-linear behavior and/or direction between applied voltage and the electric current obtained relative to other directions, can produce non-linear.Just for the name of some typical electronic units of display non-linear behavior, diode, Zener diode, DIAC, TRIAC, IGBT, transistor, FET, MOSFET, operational amplifier etc. can be adopted.
Especially, preferably perform described method, make at least one electric decoupling device be designed to amplifying device at least in part, especially operational amplifier device.Especially, such amplifying device can show non-linear behavior (although at least having Linear Amplifer behavior on wide interval), also can be used for performing described method.Just for the name of some electronic units of display amplification behavior, transistor, FET, MOSFET, IGBT, operational amplifier etc. can be used.Test shows, and special operational amplifier (or showing the electronic unit of similar amplification behavior) is especially applicable to for execution method proposed by the invention.
Electromagnetic force voltage after also proposing to measure at least one when having at least during full PWM duty cycle substantially.Current, (especially, if inverter is used to drive motor), quite common is by using pulse-width modulation (PWM) to control motor.The shortcoming that the method for the rotor-position of the detection motor before proposed has usually is, if motor is driven with the PWM duty cycle of (substantially) 100%, then can not carry out position probing (can not carry out detecting or can not detecting even at all with enough precision).But for the method for current proposition, this is feasible.Therefore, the power of motor and/or moment of torsion can use on gamut ground, and it is especially favourable.
In addition, propose to adopt described method when having at least during the low-speed handing of motor.This is another advantage of the method for current proposition, this is because initial test has shown even under the slow-speed of revolution of motor, the certainty of measurement of the method proposed also is higher.Especially, combine with the use of 100%PWM work period, this is extremely beneficial.Empirically, if very early adopt described method, the startup stage of so may shortening initial, (such as use stepping motor behavior), make it possible to shorten start-up time.
In addition, propose the circuit arrangement of the position for detecting motor, described circuit arrangement uses the rear electromagnetic force voltage of at least one motor phase of described motor at least in part, wherein motor is connected to each other by public convergence point, described circuit arrangement comprises at least one sampling apparatus and at least one apparatus for evaluating, described sampling apparatus is used for sampling at least one rear electromagnetic force voltage of at least one motor phase, described apparatus for evaluating is for detecting the intersection point of the particular voltage levels of described rear electromagnetic force voltage, wherein, at least one electric decoupling device is used, partly by described motor phase and described convergence point electrolysis coupling when at least one electric decoupling device described is used at least one motor phase and has at least.Use such circuit arrangement, above-mentioned feature and advantage also can be implemented usually, at least can be implemented in the mode analogized.In addition, also at least described circuit arrangement can be revised in the way described before in the mode analogized.
Especially, described circuit arrangement can be revised, make at least one electric decoupling device described be designed to amplifying device at least in part, especially operational amplifier device.Use such embodiment, the feature and advantage before described also can at least be used in the mode analogized usually.
Especially, if circuit arrangement is completed by motor, be then favourable.Especially, motor can be connected to compressor, result in usually especially favourable embodiment.Especially, the group of assembling before can commercially buying and selling, comprises circuit arrangement and/or motor and/or compressor set, as the group manufactured before and/or structure assembly.
Accompanying drawing explanation
When understanding the following description of possible embodiment of the present invention, the present invention and its advantage will become clearer, and following description is described with reference to accompanying drawing, and accompanying drawing shows:
Fig. 1: for having the schematic circuit diagram of the possible embodiment of the motor of control unit;
Fig. 2: be the possible embodiment of the circuit of the electric inverter for driving threephase motor;
Fig. 3: be the possible actuating scheme of brushless DC motor and the feedback of motor;
Fig. 4: be the first embodiment of the circuit for obtaining rear electromagnetic force voltage signal;
Fig. 5: be the second embodiment of the circuit for obtaining rear electromagnetic force voltage signal;
Fig. 6: be the 3rd embodiment of the circuit for obtaining rear electromagnetic force voltage signal;
Fig. 7: be the 4th embodiment of the circuit for obtaining rear electromagnetic force voltage signal.
Embodiment
Fig. 7 display is for detecting the embodiment of the circuit 17 of the improvement of the zero crossing (Z event) of BEMF.The circuit 17 proposed shown in Fig. 7 comprise for partly with the operational amplifier 16 of convergence point 12 electrolysis coupling.
The circuit 17 shown in Fig. 7 makes it possible to combine following characteristics:
Minimize step mode operation, this is because the zero crossing (Z event) of BEMF voltage can be detected under the low speed.The zero crossing detecting BEMF voltage is under the low speed vital for working together with such as compressor contour inertia machine.
By utilizing the low speed of PWM and the high speed operation of 100%, it can not provide any unnecessary deterioration in speed ability.
Due to low-loss circuit of unsegregated convergence point.
Keep correct convergence point 12 to prevent from detecting improperly the zero crossing of convergence point 12.
Especially, the present invention can be considered as:
For detecting a method for the zero crossing of rear electromagnetic force, said method comprising the steps of:
During the PWM duty cycle of 100%, rear EMF (electromagnetic force) voltage of motor phase is sampled,
Sampled rear EMF voltage is compared with reference voltage,
Relatively zero point is detected based on rear EMF voltage and reference voltage, and
By means of amplifier motor phase and convergence point decoupling zero convergence point.
Extra information can to obtain application DAN1107 and DAN1109 applied for same day with the application of applicant.The disclosure of described application is comprised in this application by reference.Especially, the scheme proposed in all described three applications can be combined in.
Reference numerals list:
1. motor unit
2. motor feedback unit
3. motor phase
4. control unit
5. rotor
6. electric wire
7. brushless DC motor model
8. inverter
9. inductance
10. fly-wheel diode
11. motor
12. convergence points (being connected to ground)
Electromagnetic force potential circuit after 13.
14. voltage dividers
15. convergence points (disconnecting with ground)
16. operational amplifiers
17. layouts improved

Claims (9)

1. a method for the position of the rotor (5) of detection motor (11), described method is by least one the rear electromagnetic force voltage (e at least one motor phase (3a, 3b, 3c) a, e b, e c) carry out sampling and detect described rear electromagnetic force voltage (e a, e b, e c) the intersection point of particular voltage levels use the rear electromagnetic force voltage (e of at least one motor phase (3a, 3b, 3c) of described motor (5) at least in part a, e b, e c) realize detecting, wherein the phase (3a, 3b, 3c) of motor (5) is connected to each other by public convergence point (12,15), it is characterized in that
When at least one motor phase (3a, 3b, 3c) is had at least by least one electric decoupling device (16) partly with described convergence point (12,15) electrolysis coupling, described electromagnetic force voltage (e after at least one a, e b, e c) measured when having at least during full PWM duty cycle,
Adopt when described method is had at least during the low-speed handing of described motor (5).
2. method according to claim 1, is characterized in that, at least one rear electromagnetic force voltage (e described a, e b, e c) compare with reference voltage.
3. method according to claim 1 and 2, is characterized in that, at least one rear electromagnetic force voltage (e described a, e b, e c) zero crossing be detected.
4. method according to claim 1, is characterized in that, at least one electric decoupling device (16) described is designed to nonlinear electric decoupling device (16) at least in part.
5. method according to claim 1, is characterized in that, at least one electric decoupling device (16) described is designed to amplifying device (16) at least in part.
6. the method according to claim 1 or 4, is characterized in that, at least one electric decoupling device (16) described is designed to operational amplifier device (16) at least in part.
7. one kind for detecting the circuit arrangement (1) of the position of motor (5), described circuit arrangement (1) uses at least one motor phase (3a of described motor (5) at least in part, 3b, 3c) rear electromagnetic force voltage (e a, e b, e c), the wherein motor phase (3a of motor (5), 3b, 3c) by public convergence point (12,15) be connected to each other, described circuit arrangement (1) comprising: at least one sampling apparatus (2), and described sampling apparatus (2) is at least one motor phase (3a, 3b, 3c) at least one after electromagnetic force voltage (e a, e b, e c) sample; With at least one apparatus for evaluating (4), described apparatus for evaluating (4), for detecting the intersection point of the particular voltage levels of described rear electromagnetic force voltage, is characterized in that,
Also comprise at least one electric decoupling device (16), at least one electric decoupling device (16) described is at least one motor phase (3a, 3b, 3c) and have at least time partly by described motor phase (3a, 3b, 3c) with described convergence point (12,15) electrolysis coupling, at least one rear electromagnetic force voltage (e described a, e b, e c) measured when having at least during full PWM duty cycle,
Adopt when the method for carrying out described measurement is had at least during the low-speed handing of described motor (5).
8. circuit arrangement according to claim 7 (1), is characterized in that, at least one electric decoupling device (16) described is designed to amplifying device (16) at least in part.
9. circuit arrangement according to claim 8 (1), is characterized in that, at least one electric decoupling device (16) described is designed to operational amplifier device (16) at least in part.
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US5923134A (en) * 1996-12-10 1999-07-13 Zexel Corporation Method and device for driving DC brushless motor
US6128436A (en) * 1998-08-03 2000-10-03 Visteon Global Technologies, Inc. Speed monitoring and control for a brushless motor

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US7956561B2 (en) * 2007-05-28 2011-06-07 Denso Corporation Rotor position sensing system of brushless motor

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US5923134A (en) * 1996-12-10 1999-07-13 Zexel Corporation Method and device for driving DC brushless motor
US6128436A (en) * 1998-08-03 2000-10-03 Visteon Global Technologies, Inc. Speed monitoring and control for a brushless motor

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