CN103516166A - Outer rotor type permanent magnet motor with rotor position sensor, method for detecting rotor position and servo motor system - Google Patents

Abstract

The invention discloses an outer rotor type permanent magnet motor with a rotor position sensor, a method for detecting a rotor position and a servo motor system. The motor comprises 4N sensor windings for position detection, N is an integer larger than zero, the sensor windings are wound on at least 4N salient poles in a stator respectively, the 4N sensor windings are divided into two sets, each set of sensor windings comprises an upper-section winding and a lower-section winding, the upper-section windings are connected in series, the lower-section windings are connected in series, the fundamental wave phase position of combination inductance generated after the upper-section windings of the two sets are connected in series and the fundamental wave phase position of combination inductance generated after the lower-section windings are connected in series differ by 180 degrees and are connected in series, the fundamental wave phase positions of the upper-section windings of the two set of windings differ by 90 degrees, the sensor windings are connected in parallel, and the parallel connecting point of the sensor windings is an excitation signal input end. The series connecting points of the upper-section windings and the lower-section windings of the two sets of windings are the output ends of position signals. A servo motor can achieve corner detection under a high-temperature and high-vibration environment.

Description

Outer-rotor type magneto, rotor position detecting method and the servo electrical machinery system with rotor-position sensor

Technical field

The present invention relates to the rotor position angle detection technique of servomotor, be specifically related to the detection technique of outer-rotor type permanent magnet machine rotor position.

Background technology

At present the rotor position angle of servomotor is detected and mainly utilizes the mode of optical encoder or resolver to detect, all there is defect and deficiency in these two kinds of modes in actual application:

1, optical encoder mode: which need to be arranged on optical encoder on the axle below of motor, detects to realize rotor angle.But optical encoder is owing to using the formations such as optics and semiconductor device, semiconductor element lifetime poor reliability while using under hot environment.Meanwhile, when strong vibration occasion is used, optics easily damages, causes measuring ability to lose efficacy.And because motor rear end is equipped with encoder, be difficult to realize the slimming of motor.

2, resolver mode: which need to be arranged on resolver on the axle below of motor, realizes rotor angle detect with this.But resolver has 6 lead-in wires that wiring is increased, and need to be arranged on the rear portion of motor, is difficult to realize the slimming of motor.

Summary of the invention

The rotor position angle that the present invention is directed to existing servomotor detects existing problem, and a kind of outer-rotor type magneto with rotor-position sensor is provided.This servomotor can be realized the roll angle inspection under high temperature, high vibration environment, and reduces wiring number, and reliability is higher.

Based on this servomotor, the present invention also provides the detection method of a kind of outer-rotor type permanent magnet machine rotor position and utilizes motor roll angle inspection principle of the present invention to form servomotor system simultaneously.

In order to achieve the above object, the present invention adopts following technical scheme:

The outer-rotor type magneto with rotor-position sensor, comprise rotor and stator, described rotor is placed in stator outside, described magneto also comprises 4N the transducer winding of using as position probing, wherein N is the integer of > 0, in described stator, have at least 4N the prominent utmost point to be wound with respectively transducer winding, described 4N transducer winding is divided into 2 groups, the transducer winding of every group is divided into epimere winding and hypomere winding, each windings in series of epimere connects, each windings in series of hypomere connects, the fundamental phase of the combination inductance after every group of epimere windings in series and the fundamental phase of the combination inductance after hypomere windings in series differ 180 degree and are one another in series, the fundamental phase of each epimere winding inductance of 2 groups of windings differs 90 degree each other, 2 groups of transducer windings are in parallel, itself and interface are excitation signal input, each epimere winding of 2 groups of windings is the output of position signalling with the contact of connecting of lower end winding.

In the preferred embodiment of magneto, described magneto also comprises that 3K as the torque winding that produces electromagnetic torque, wherein K is the integer of > 0, on described stator, be not wound with transducer winding prominent extremely in, at least 3 prominent extremely going up are wound with respectively torque winding, and described 3K torque winding is divided into 3 groups, the number of windings >=1 of every group, the back-emf of 3 groups of torque windings differs 120 degree electrical degrees each other, with three-phase star or triangle, joins.

Further, described rotor consists of permanent-magnet steel, soft magnetic material yoke and rotating shaft, and described rotor magnetic pole is along being uniformly distributed in rotor outer circle surface or embedding rotor, and alternating polarity is arranged, the integer that permanent-magnet pole logarithm is P >=2, and described magnet steel is tile-type or annular.

Further, the prominent utmost point on described stator is along the radial distribution of stator inner circle, and each prominent utmost point shape is not necessarily identical.

Based on above-mentioned outer-rotor type magneto, the detection method of outer-rotor type permanent magnet machine rotor provided by the invention position, comprises the steps:

(1) the excitation signal input 4N on stator in outer-rotor type magneto transducer winding being interconnected to form is received high frequency field power supply, the position signalling output outgoing position signal that transducer winding is interconnected to form;

(2) according to following formula, carry out can obtaining rotor position angle θ after arctangent cp cp operation processing _m,

v wherein ₁₂and V ₃₄position signalling for the output of transducer winding.

Utilize motor roll angle inspection principle of the present invention to form servomotor system, it comprises:

The outer-rotor type magneto with rotor-position sensor, excitation signal and the position signalling processing unit and control circuit and the power amplifier unit that based on such scheme, form, described magneto output shaft connects control object, excitation signal and position signalling processing unit produce the excitation signal input that excitation signal is supplied with the transducer winding of magneto, the position signalling output outgoing position signal of transducer winding, and be input to excitation signal and position signalling processing unit;

Excitation signal and position signalling processing unit utilize formula:

${\mathrm{\θ}}_m=\frac{1}{10}\·{\mathrm{tg}}^{-1}\left(\frac{V_{12}}{V_{34}}\right)$

Signal is processed and obtained the rotor position angle of motor and export to control circuit and power amplifier unit;

In control circuit and power amplifier unit, control circuit is by operating instruction and the comparison of rotor angle information, utilization regulates the voltage of motor or electric current that above-mentioned deviate is reduced to the control laws such as proportion integration differentiation of deviate, realizes the operation that control object is followed operating instruction.

The outer-rotor type magneto forming based on such scheme, without using optical encoder and resolver, by rotor angle measuring ability winding is set in motor, the new construction motor that roll angle inspection function and motor torque function are integrated in one.

Because motor internal does not have semiconductor and optics, with optical encoder ratio, it can realize roll angle inspection under the high vibration environment of high temperature, can form the servo system that reliability is higher; Put english and become or coder structure is compared with motor rear portion, can realize the extremely short servomotor of axial length.

Zhong， of the present invention detection position is compared with 6 that revolve change with lead-in wire, reduces two, and distribution reduces reliability and improves.

The present invention can be applicable to servo-control mechanism and the system of the high temperature such as Industry Control, robot, Aero-Space, battlebus and strong vibration environment, and the ultrathin servo electrical machinery system of low inertia.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, further illustrate the present invention.

Fig. 1 is P=5 in this example, N=1, and the prominent number of poles of torque is the structural representation of stator in the electric machine structure of 12 o'clock;

Fig. 2 is P=5 in this example, N=1, and the prominent number of poles of torque is the structural representation of the electric machine structure rotor of 12 o'clock;

Fig. 3 is the equivalent circuit diagram that in Fig. 1 example illustrated, stator upper sensor winding connects;

Fig. 4 is corresponding potential vector figure in Fig. 1 example illustrated;

Fig. 5 is that angle position detects principle of compositionality figure;

Fig. 6 is servomotor system.

Embodiment

For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.

Outer-rotor type magneto provided by the invention, rotor is at the magneto of stator outside, and it mainly comprises rotor and stator.

Referring to Fig. 2, rotor 100 is by permanent-magnet steel 101, and soft magnetic material yoke 102 and rotating shaft 103 form.Rotor magnetic pole is uniformly distributed along rotor outer circle surface (or embedding in rotor), and alternating polarity is arranged, and magnet steel is tile-type or annular, the integer that permanent-magnet pole logarithm is P >=2.

Referring to Fig. 1, stator 200 consists of the soft magnetic materials such as silicon steel sheet and coil, and stator has the prominent utmost point, and the prominent utmost point is along the radial distribution of stator inner circle, and each prominent utmost point shape is not necessarily identical.

In order to realize the detection of motor corner, the present invention is wound with 4N the transducer winding of using as position probing and 3K the torque winding as generation electromagnetic torque on the stator of motor, and wherein N, K are the integer of > 0.

In said stator, have at least 4N the prominent utmost point to be wound with respectively the transducer winding of using as position probing, here N is greater than 0 integer, above-mentioned 4N transducer winding is divided into 2 groups, the transducer winding of every group is divided into epimere winding and hypomere winding, each windings in series of epimere connects, each windings in series of hypomere connects, the fundamental phase of the combination inductance after every group of epimere windings in series and the fundamental phase of the combination inductance after hypomere windings in series differ 180 degree and are one another in series, the fundamental phase of each epimere winding inductance of 2 groups of windings differs 90 degree each other, 2 groups of transducer windings are in parallel, itself and interface are excitation signal input, each epimere winding of 2 groups of windings is the output of position signalling with the contact of connecting of lower end winding.

All the other not around transducer winding prominent extremely in, have at least 3 prominent to be wound with as the torque winding that produces electromagnetic torque on extremely, these torque windings are divided into 3 groups, and the number of windings of every group is more than or equal to 1, the back-emf of 3 groups of windings differs 120 degree electrical degrees each other, is connected into three-phase star or triangle.

Based on such scheme, specific embodiment of the invention is as follows:

As an example, this example is with P=5, N=1, and the outer-rotor type magneto that the prominent number of poles of torque is 12 describes.

Referring to Fig. 1, in this example, on stator, be wound with altogether 4N transducer winding, N=1, i.e. 4 transducer windings.Concrete winding method as mentioned above, is not repeated herein.

The transducer winding of coiling thus, its inductance characteristic is as follows:

Fig. 3 is 4 equivalent circuit diagrams after transducer winding technique, and wherein L1, L2, L3, L4 are transducer winding, are connected to each other to bridge circuit.

Inductance L 1, L2, L3, L4 are with rotor angle _mvariation be respectively

L1=L0+Lmsin(10θ _m) (1)

L2=L0+Lmsin(10θ _m-180) (2)

L3=L0+Lmcos(10θ _m) (3)

L4=L0+Lmcos(10θ _m-180) (4)

The fundametal compoment that the DC component that wherein L0 is inductance, Lm are inductance.

In this example, be provided with 12 torque windings, be respectively T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, according to the coiling requirement of torque winding, these 12 torque windings are divided into 3 groups (as shown in Figure 4):

The 1st group consists of T1, T4, T7, T10 winding, their back-emf same-phase, and the connection that is one another in series, forms U phase electromotive force Vu.

The 2nd group consists of T2, T5, T8, T11 winding, their back-emf same-phase, and the connection that is one another in series, forms V phase electromotive force Vv.

The 3rd group consists of T3, T6, T9, T12 winding, their back-emf same-phase, and the connection that is one another in series, forms W phase electromotive force Vw.

The phase place of above-mentioned U, V, W phase electromotive force each other phase phasic difference 120 is spent, is formed 3 symmetrical permanent magnet AC motor systems, and concrete potential vector figure as shown in Figure 4.

Based on above-mentioned electric machine structure, its rotor angle testing process is as follows:

As shown in Figure 3,4 transducer windings are connected to each other in bridge circuit, and X1-X2 end is excitation signal input, and Y1-Y2 end is the output of position signalling.

Referring to Fig. 5, when detecting, it is high frequency field power supply e more than several thousand Hz that X1-X2 end is received to frequency, and the signal voltage of the Y1-Y2 end of bridge circuit is received to position signalling processing unit 300, through position units place 300 can the angular position theta to rotor _m.

Wherein, high frequency field power supply e will supply high-frequency ac or high-frequency impulse as excitation signal for X1-X2 end provides.

In this example, as an example, with excitation signal voltage e=e _msin (ω t), (e wherein _mfor the amplitude of excitation signal voltage, the angular frequency that ω is excitation signal, t is the time) process of position probing is described.

Because frequency height can negligible resistance impact, the present invention utilizes formula (1), (2), (3), (4) by simply can be calculated the position signalling V of transducer winding output ₁₂and V ₃₄:

$V_{12}=-\frac{L_m}{2L_0}\·e_m\·\sin (10\·{\mathrm{\θ}}_m)---\left(5\right)$

$V_{34}=-\frac{L_m}{2L_0}\·e_m\·\cos (10\·{\mathrm{\θ}}_m)---\left(6\right)$

The DC component that wherein L0 is inductance, the fundametal compoment that Lm is inductance, e _mamplitude for excitation signal voltage.

According to formula (5), (6), can obtain rotor angle _m:

${\mathrm{\θ}}_m=\frac{1}{10}\·{\mathrm{tg}}^{-1}\left(\frac{V_{12}}{V_{34}}\right)---\left(7\right)$

Hence one can see that, by the output signal V of bridge circuit ₁₂and V ₃₄be input to after the arctangent cp cp operation of utilizing common analog or Digital Signal Processing mode to carry out formula (7) in the signal processing unit of position signalling processing unit 300， position is processed and both can obtain rotor position angle θ _m.

The magneto forming thus, it is without using optical encoder and resolver, by rotor angle measuring ability winding is set in motor, the new construction motor that roll angle inspection function and motor torque function are integrated in one.

Moreover lead-in wire for ，Qi detection position, the Y1-Y2 end for the X1-X2 end as input and output, only needs four, compares with 6 that revolve change, reduces two, and distribution reduces reliability and improves.

Referring to Fig. 5, it is depicted as and utilizes motor roll angle inspection principle of the present invention to form servomotor system, in this system, motor 400 output shafts connect control object 500, by excitation signal and position signalling processing unit 300, produce the transducer winding line end X1-X2 that excitation signal e supplies with motor, the output signal V of transducer winding ₁₂and V ₃₄through Y1-Y2 line end, be input to excitation signal and position signalling processing unit 300.

In excitation signal and position signalling processing unit 300, utilize formula (7) signal to be processed to the rotor position angle θ that obtains motor _mand export to control circuit and power amplifier unit 600.

In control circuit and power amplifier unit 600, control circuit is by operating instruction and the comparison of rotor angle information, utilization regulates the voltage of motor or electric current that above-mentioned deviate is reduced to the control laws such as proportion integration differentiation of deviate, realizes the operation that control object is followed operating instruction.

Wherein position signalling processing unit can consist of analog circuit, also can be carried out digital circuits such as single-chip microcomputer or DSP, consisting of after A/D conversion.

More than show and described basic principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.

Claims (6)

1. the outer-rotor type magneto with rotor-position sensor, comprise rotor and stator, described rotor is placed in stator outside, it is characterized in that, described magneto also comprises 4N the transducer winding of using as position probing, wherein N is the integer of > 0, in described stator, have at least 4N the prominent utmost point to be wound with respectively transducer winding, described 4N transducer winding is divided into 2 groups, the transducer winding of every group is divided into epimere winding and hypomere winding, each windings in series of epimere connects, each windings in series of hypomere connects, the fundamental phase of the combination inductance after every group of epimere windings in series and the fundamental phase of the combination inductance after hypomere windings in series differ 180 degree and are one another in series, the fundamental phase of each epimere winding inductance of 2 groups of windings differs 90 degree each other, 2 groups of transducer windings are in parallel, itself and interface are excitation signal input, each epimere winding of 2 groups of windings is the output of position signalling with the contact of connecting of lower end winding.

2. the outer-rotor type magneto with rotor-position sensor according to claim 1, it is characterized in that, described magneto also comprises that 3K as the torque winding that produces electromagnetic torque, wherein K is the integer of > 0, on described stator, be not wound with transducer winding prominent extremely in, at least 3 prominent extremely going up are wound with respectively torque winding, described 3K torque winding is divided into 3 groups, the number of windings >=1 of every group, the back-emf of 3 groups of torque windings differs 120 degree electrical degrees each other, with three-phase star or triangle, joins.

3. the outer-rotor type magneto with rotor-position sensor according to claim 1, it is characterized in that, described rotor consists of permanent-magnet steel, soft magnetic material yoke and rotating shaft, described rotor magnetic pole is along being uniformly distributed in rotor outer circle surface or embedding rotor, alternating polarity is arranged, permanent-magnet pole logarithm is the integer of P >=2, and described magnet steel is tile-type or annular.

4. the outer-rotor type magneto with rotor-position sensor according to claim 1 and 2, is characterized in that, the prominent utmost point on described stator is along the radial distribution of stator inner circle, and each prominent utmost point shape is not necessarily identical.

5. the detection method of outer-rotor type permanent magnet machine rotor position, is characterized in that, described detection method comprises the steps:

(1) the excitation signal input 4N on stator in outer-rotor type magneto transducer winding being interconnected to form is received high frequency field power supply, the position signalling output outgoing position signal that transducer winding is interconnected to form;

(2) according to following formula, carry out can obtaining rotor position angle θ after arctangent cp cp operation processing _m,

v wherein ₁₂and V ₃₄position signalling for the output of transducer winding.

6. servomotor system, it is characterized in that, described system comprises: the outer-rotor type magneto with rotor-position sensor in claim 1 to 4 described in any one, excitation signal and position signalling processing unit, and control circuit and power amplifier unit, described magneto output shaft connects control object, excitation signal and position signalling processing unit produce the excitation signal input that excitation signal is supplied with the transducer winding of magneto, the position signalling output outgoing position signal of transducer winding, and be input to excitation signal and position signalling processing unit,

Excitation signal and position signalling processing unit utilize formula:

${\mathrm{\θ}}_m=\frac{1}{10}\·{\mathrm{tg}}^{-1}\left(\frac{V_{12}}{V_{34}}\right)$

Signal is processed and obtained the rotor position angle of motor and export to control circuit and power amplifier unit;

In control circuit and power amplifier unit, control circuit is by operating instruction and the comparison of rotor angle information, utilization regulates the voltage of motor or electric current that above-mentioned deviate is reduced to the control laws such as proportion integration differentiation of deviate, realizes the operation that control object is followed operating instruction.

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