CN106787543B

CN106787543B - Disc type switch reluctance motor and design method for reducing torque fluctuation thereof

Info

Publication number: CN106787543B
Application number: CN201611165599.XA
Authority: CN
Inventors: 文长明; 裴世聪; 文可
Original assignee: Ciss Technology Co ltd
Current assignee: Ciss Technology Co ltd
Priority date: 2016-12-16
Filing date: 2016-12-16
Publication date: 2023-09-05
Anticipated expiration: 2036-12-16
Also published as: CN106787543A

Abstract

The invention discloses a disc type switch reluctance motor and a design method for reducing torque fluctuation thereof. The number of stator poles on the x-th ring on the stator and the number of rotor poles on the x-th ring on the rotor satisfy the following relationship on each stator of the motor in the order from the outer ring to the inner ring: one, S _x ＝(T _x (W) ×j, where S _x T is the number of rotor poles on the x-th ring of the rotor _x The number of the stator magnetic poles on the x-th ring on the stator is an even number, W is the number of power supply phases, and j is a positive integer; secondly, the number of rotor magnetic poles on the xth ring of the rotor is ensured<Number of stator poles on the x-th ring on the stator. The stator coils on the same circle are powered by the same power supply, the stator coils on different circles are powered by different power supplies, and the power supply phase of the stator coils between the two circles has a certain initial phase angle difference delta T. The invention effectively reduces the output torque fluctuation of the composite motor by designing the initial phase angle difference delta T.

Description

Disc type switch reluctance motor and design method for reducing torque fluctuation thereof

Technical Field

The invention relates to a motor, in particular to a disc type switch reluctance motor and a design method for reducing torque fluctuation.

Background

The switch reluctance motor is a novel speed regulating motor, and the speed regulating system of the switch reluctance motor has the advantages of a direct current speed regulating system and an alternating current speed regulating system, and is the latest generation stepless speed regulating system of a relay frequency conversion speed regulating system and a brushless direct current motor speed regulating system. The speed regulating system has the advantages of simple and firm structure, wide speed regulating range, excellent speed regulating performance, higher efficiency in the whole speed regulating range and high system reliability. The current speed regulating system mainly comprises a switch reluctance motor, a power converter, a controller and a position detector. The controller includes a control circuit for the power converter and the rotor position detector is mounted at one end of the switched reluctance motor.

Switched Reluctance Motors (SRMs) are components of SRDs that perform electromechanical energy conversion, and are also a primary hallmark of SRDs from other motor drive systems. The SRM is a doubly salient variable reluctance motor, and salient poles of a stator and a rotor are mainly formed by laminating common silicon steel sheets. The rotor has no winding and permanent magnet, the stator pole is wound with concentrated winding, the two windings which are opposite in radial direction are connected together, which is called as 'one phase', the SR motor can be designed into a plurality of different phase number structures, and the pole numbers of the stator and the rotor are matched in a plurality of different ways. The number of phases is large, the step angle is small, the torque pulsation is reduced, the structure is complex, the number of main switching devices is large, the cost is high, and four-phase (8/6) structures and three-phase (12/8) structures are widely used nowadays.

The prior switch reluctance motor has the following characteristics: 1. the shape of the motor is the same as that of a squirrel-cage motor; 2. under the condition of needing large torque and large inertia, if the motor is still realized by a column motor, a larger motor volume is needed; 3. the motor is realized by a disc type switch reluctance motor, so that larger output torque and inertia can be obtained within the same volume range; 4. the disc-type switch reluctance motor is more suitable for occasions requiring large torque and reciprocating operation, such as fans, water pumps, pumping units and the like.

However, the existing disc-type switched reluctance motor has the defects that:

1. there is torque ripple: the output torque curve is not flat enough and is one of main bottlenecks of the disc-type switch reluctance motor; the method comprises the steps that maximum torque is obtained from one phase electrifying, tangential force obtained through magnetic flux change gradually becomes smaller along with rotation of a rotor, a moment arm is unchanged, the torque gradually becomes smaller until the torque is reduced to 0, and the phase is powered off; simultaneously, the next phase is electrified and the maximum torque is obtained; the cycle starts, so that the output torque of the reluctance motor fluctuates, which is the second main bottleneck of the disc-type switched reluctance motor;

2. the wiring is complicated: each stator coil of the switched reluctance motor is provided with two connectors which are one in and one out, if the number of the stators is N, 2N connectors are provided, and how to design a reasonable connector block is another target of the design of the switched reluctance motor, wherein the reasonable connector block is used for connecting the stator coils and the output terminals of the controller in a simplified and orderly manner;

3. it is difficult for a single motor to further obtain a greater output torque: under the condition that the volume of the motor is not increased significantly, the traditional design concept is difficult to obtain larger output torque;

4. the controller is complex and huge: the number of output phases of the controller of the switched reluctance motor can be 2, 3 and 4, even more, the more the number of phases is, the more the number of switching elements of the controller is, the more the controller is complex and the larger the volume is.

In addition, the controller outputting 3-phase electricity is more in line with the use habit of an operator, and how to drive the switched reluctance motor by using the 3-phase switching power supply and obtain larger torque and smaller torque fluctuation is one of design targets.

Disclosure of Invention

Aiming at the technical problem of torque fluctuation of the conventional disc type switch reluctance motor, the invention provides a disc type switch reluctance motor and a design method for reducing the torque fluctuation.

The specific technical scheme of the invention is as follows: a disc-type switch reluctance motor comprises two stators, a rotor positioned between the two stators and a bearing coaxially connecting the two stators and the rotor; a plurality of stator coils are arranged on each stator, each stator coil is provided with a stator magnetic pole, and a plurality of rotor magnetic poles are arranged on the rotor; the plurality of stator coils are uniformly distributed on one side of the corresponding stator facing the rotor by taking the axis of the stator as the circle center, and enclose into at least two circles of concentric ring structures; the magnetic poles of the rotor are uniformly distributed in the rotor by taking the axis of the rotor as the circle center,also encloses a concentric ring structure of at least two rings; two ends of each rotor magnetic pole penetrate through two opposite sides of the rotor so that the shape formed by surrounding can correspond to the shape formed by surrounding a plurality of stator coils on the stators on two sides; the number of stator poles on the x-th ring on the stator and the number of rotor poles on the x-th ring on the rotor satisfy the following relationship in the order from the outer ring to the inner ring: one, S _x ＝(T _x (W) ×j, where S _x T is the number of rotor poles on the x-th ring of the rotor _x The number of the stator magnetic poles on the x-th ring on the stator is an even number, W is the number of power supply phases, and j is a positive integer; secondly, the number of rotor magnetic poles on the xth ring of the rotor is ensured<The number of stator poles on the x-th ring on the stator; the stator coils on the same circle are powered by the same power supply, the stator coils on different circles are powered by different power supplies, and the power supply phase of the stator coils between the two circles has a certain initial phase angle difference delta T.

As a further improvement of the above-mentioned scheme, the rotor poles of the outermost ring on the rotor are uniformly wound around the circumference of the rotor.

As a further improvement of the scheme, the stator coils on the same ring are sequentially grouped into W groups and are divided into T groups _x Each group of stator coil groups is respectively connected with different phases of a power supply in sequence; the stator coils are distributed in a central symmetry along one diameter of the stator, and two stator magnetic poles on the same diameter form a common-diameter magnetic pole which is used as a pair of couples for driving the corresponding rotor to rotate.

Further, to generate (T _x The power circulation sequence of the stator coils positioned on the same ring is as follows: a is that _i _A _i ′、B _i _B _i ′、C _i _C _i ', … …, wherein A, B, C, … … respectively represent specific power source phases of the power source, i is 1,2, … …, (T) _x /W)/2。

Further, by selecting the power-on circulation sequence formed by different stator coils positioned on the same ring, the couple pair for driving the disc-type switch reluctance motor to continuously rotate is realized.

As a further improvement of the above scheme, the disc-type switched reluctance motor further comprises a plurality of axial multistage series components, each of which comprises two newly added stators and one newly added rotor positioned between the two newly added stators; the axial multistage serial components form an axial multistage serial structure with the original two stators and the original one rotor through bearings: stator+rotor+stator+stator +rotor+stator+ … ….

The invention also provides a design method for reducing torque fluctuation of the disc type switch reluctance motor, which comprises two stators, a rotor positioned between the two stators and a bearing coaxially connecting the two stators and the rotor; a plurality of stator coils are arranged on each stator, each stator coil is provided with a stator magnetic pole, and a plurality of rotor magnetic poles are arranged on the rotor; the plurality of stator coils are uniformly distributed on one side of the corresponding stator facing the rotor by taking the axis of the stator as the circle center, and enclose into at least two circles of concentric ring structures; the rotor magnetic poles are uniformly distributed in the rotor by taking the axis of the rotor as the circle center, and also form at least two circles of concentric ring structures; two ends of each rotor magnetic pole penetrate through two opposite sides of the rotor so that the shape formed by surrounding can correspond to the shape formed by surrounding a plurality of stator coils on the stators on two sides; the design method for reducing torque fluctuation comprises the following steps:

the number of stator poles on the x-th ring on the stator and the number of rotor poles on the x-th ring on the rotor satisfy the following relationship in the order from the outer ring to the inner ring: one, S _x ＝(T _x (W) ×j, where S _x T is the number of rotor poles on the x-th ring of the rotor _x The number of the stator magnetic poles on the x-th ring on the stator is an even number, W is the number of power supply phases, and j is a positive integer; secondly, the number of rotor magnetic poles on the xth ring of the rotor is ensured<The number of stator poles on the x-th ring on the stator; the stator coils on the same circle are powered by the same power supply, the stator coils on different circles are powered by different power supplies, and the power supply phase of the stator coils between the two circles has a certain initial phase angle difference delta T.

As a further improvement of the above scheme, the stator coils on the same ring are arranged in turnW is divided into T _x Each group of stator coil groups is respectively connected with different phases of a power supply in sequence; the stator coils are distributed in a central symmetry along one diameter of the stator, and two stator magnetic poles on the same diameter form a common-diameter magnetic pole which is used as a pair of couples for driving the corresponding rotor to rotate.

As a further improvement of the above-mentioned scheme, the disc-type switched reluctance motor is to generate (T _x The power circulation sequence of the stator coils positioned on the same ring is as follows: a is that _i _A _i ′、B _i _B _i ′、C _i _C _i ', … …, wherein A, B, C, … … respectively represent specific power source phases of the power source, i is 1,2, … …, (T) _x /W)/2。

The invention adopts the magnetic pole arrangement of multiple circles of concentric circles, each circle is powered by an independent power supply terminal, and the synthesized output torque fluctuation can be effectively reduced by a reasonable phase angle between the power supply sources.

Drawings

Fig. 1 is a schematic diagram of a disc-type switched reluctance motor according to embodiment 1 of the present invention.

Fig. 2 is a schematic structural view of the stator of fig. 1.

Fig. 3 is a schematic view of the rotor in fig. 1.

Fig. 4a, 4b, 4c and 4d are diagrams showing the state change of the energizing operation process of the disc-type switched reluctance motor according to the present invention.

Fig. 5 is a schematic diagram of the structure of a disc-type switched reluctance motor according to embodiment 2 of the present invention.

Fig. 6 is a schematic structural diagram of a disc-type switched reluctance motor according to embodiment 3 of the present invention.

Fig. 7a is a schematic diagram of output torque during simulation of the rotor in fig. 6.

Fig. 7b is another output torque diagram for the simulation of the rotor of fig. 6.

Fig. 7c is a schematic diagram of output torque of the disc-type switched reluctance motor according to embodiment 5 of the present invention in simulation.

Fig. 8 is a schematic structural view of a disc-type switched reluctance motor according to embodiment 6 of the present invention.

Fig. 9 is a wiring diagram of a stator and an annular connection terminal plate of a disc-type switched reluctance motor according to embodiment 7 of the present invention.

Fig. 10 is a structural view of the ring terminal block of fig. 9.

Fig. 11 is a partial structural view of the ring terminal block of fig. 10.

Fig. 12 is a schematic perspective view of one of the terminals in fig. 11.

Fig. 13 is a top view of fig. 12.

Fig. 14 is a ring wiring schematic of the ring terminal block wiring of fig. 10.

Fig. 15 is an equivalent circuit diagram of the ring terminal block wiring in fig. 10.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Example 1

The disc-type switch reluctance motor can improve output torque on the basis of a double-stator structure of a stator, a rotor and a stator. On the mechanical structure design, each phase in the stator is uniformly distributed into a plurality of couples in the circumferential direction, and on the electrical structure design, a three-phase switching power supply is utilized, and a parallel power supply, transmission and distribution method is adopted to supply power to a plurality of stator coils.

As shown in fig. 1, the disc-type switched reluctance motor of the present embodiment includes two stators 1 (see fig. 2), a rotor 2 (see fig. 3), and a bearing 6. The rotor 2 is located between the two stators 1 and is coaxially connected with the two stators 1 through a bearing 6. A plurality of stator coils 4 are mounted on each stator 1, one stator pole 3 is mounted on each stator coil 4, and a plurality of rotor poles 5 are mounted on the rotor 2.

The invention is designed on the mechanical structure: the plurality of stator coils 4 are uniformly distributed on the side of the corresponding stator 1 facing the rotor 2 by taking the axis of the stator 1 as the center of a circle, and the plurality of stator coils 4 enclose at least one circle. The rotor magnetic poles 5 are uniformly distributed in the rotor 2 by taking the axis of the rotor 2 as the circle center, and a plurality of rotor magnetic poles 5 also enclose at least one circle. The two ends of each rotor pole 5 penetrate the opposite sides of the rotor 2 so that the enclosed shape can correspond to the enclosed shape of the plurality of stator coils 4 on the two-sided stator 1. When the number of turns of the plurality of stator coils 4 is two or more, the arrangement is in the form of concentric turns, and when the number of turns of the plurality of rotor poles 5 is two or more, the arrangement is also in the form of concentric turns.

The number of stator poles on the x-th ring on the stator 1 and the number of rotor poles on the x-th ring on the rotor 2 satisfy the following relationship in the order from the outer ring to the inner ring: one, S _x ＝(T _x (W) ×j, where S _x For the number of rotor poles on the x-th ring on the rotor 2, T _x The number of the stator magnetic poles on the x-th ring on the stator 1 is an even number, W is the number of power supply phases, and j is a positive integer; secondly, the number of rotor magnetic poles on the xth ring of the rotor 2 is ensured<Number of stator poles on the x-th ring on the stator 1.

In the present embodiment, on the side of each stator 1 facing the rotor 2, several stator coils 4 are installed, which are uniformly distributed around the axis of the stator 1 in one turn, one stator pole 3 being installed on each stator coil 4; and a plurality of rotor poles 5 are installed on the circumference of the rotor 2 to be uniformly distributed around the axis of the rotor 2. That is, the plurality of stator coils 4 are uniformly distributed on the side of the corresponding stator 1 facing the rotor 2 in a ring-shaped pattern centering on the axis of the stator 1, and the rotor poles 5 are uniformly wound around the circumference of the rotor 2.

Among them, it is critical that the number of stator poles and the number of rotor poles satisfy the following relationship: s= (T/W) ×j, where S is the number of rotor poles, T is the number of stator poles, W is the number of power phases, e.g. w=3 represents the number of power phases of the three-phase power supply, j=positive integer, e.g. 1,2, 3, … …;2. the number of rotor poles is guaranteed to be less than the number of stator poles. The number of rotor poles and the number of stator poles meeting the conditions can ensure that a one-phase power supply is electrified and can generate a plurality of couples.

In addition, the three-phase power-on sequence is also very critical, and the electrical structure of the disc-type switched reluctance motor needs to be designed before the time: the stator coils 4 on the same ring are sequentially grouped into W groups of coils, and are divided into T groups _x Each group of stator coil groups is respectively connected with different phases of a power supply in sequence; the stator coils 4 are arranged in an axisymmetric manner by taking one diameter of the stator 1 as a limit, and two stator magnetic poles 3 on the same diameter form a common-diameter magnetic pole as a couple for driving the corresponding rotor 1 to rotate.

The three-phase switching power supply A, B, C is described in detail by taking the example that each stator 1 has 48 stator poles 3, namely 48 stator coils 4, and the rotor 2 has 32 rotor poles 5.

Referring again to fig. 2, on the side of the stator 1 facing the rotor 2, a plurality of stator coils 4 are uniformly distributed around the axis of the stator 1 in a circumferential direction, and each stator coil 4 is provided with a stator pole 3. The wiring law of these stator coils 4 and the three phases is designed according to the following: a is that ₁ 、B ₁ 、C ₁ ，A ₂ 、B ₂ 、C ₂ ，……，A ₈ 、B ₈ 、C ₈ ，A ₁ ′、B ₁ ′、C ₁ ′，A ₂ ′、B ₂ ′、C ₂ ′，……，A8′、B8′、C8′。

That is, the 48 stator coils 4 are sequentially grouped into 16 stator coil groups of 3 numbers, each group of stator coils is sequentially A, B, C three phases, and the 16 stator coil groups are divided into two stator coil areas, namely, the stator poles 3 of the following stator coils 4 are one stator coil area: a is that ₁ 、B ₁ 、C ₁ ，A ₂ 、B ₂ 、C ₂ ，……，A ₈ 、B ₈ 、C ₈ While the stator pole 3 of the following stator coil 4 is another stator coil area: a is that ₁ ′、B ₁ ′、C ₁ ′，A ₂ ′、B ₂ ′、C ₂ ', … …, A8', B8', C8'. Wherein the two stator poles 3 located on the same diameter of the stator 1 are common diameter poles, e.g., common diameter poles a and a' (e.g., a) ₁ And A ₁ ′，A ₂ And A ₂ ′，……，A ₈ And A ₈ '), B and B' (e.g. B ₁ And B ₁ ′，B ₂ And B ₂ ′，……，B ₈ And B ₈ '), C and C' (e.g. C ₁ And C ₁ ′，C ₂ And C ₂ ′，……，C ₈ And C ₈ '). The tangential forces of the common-diameter magnetic poles in the circumferential direction are equal in magnitude and opposite in direction, and a pair of couples for driving the rotor 2 to rotate is formed.

For a three-phase-powered disc switched reluctance motor, the present embodiment has 48/3/2=8 couples per phase power supply. The marking is as follows: a is that _i _A _i ′、B _i _B _i ′、C _i _C _i ' i=1 to 8, as shown in fig. 2. That is, if phase A is energized and phases B and C are de-energized, then all A ₁ ～A ₈ ，A ₁ ′～A ₈ ' simultaneously electrifying, and generating 8 pairs of force couple in the phase A instantly; if B phase is electrified, A phase and C phase are disconnected, all B phases ₁ ～B ₈ ，B ₁ ′～B ₈ ' simultaneously electrifying, and generating 8 pairs of force couple instantly by the phase B; if C phase is electrified, A phase and B phase are powered off, all C ₁ ～C ₈ ，C ₁ ′～C ₈ ' simultaneously energizing, phase C instantaneously produces 8 pairs of force couples. I.e. in the following orderRing power on A _i _A _i ′、B _i _B _i ′、C _i _C _i ' the output torque of each phase of power is 8 pairs of couples, and the output torque is very huge.

Therefore, to generate (T) _x The energization cycle sequence of the stator coils 4 located on the same ring is as follows: a is that _i _A _i ′、B _i _B _i ′、C _i _C _i ', … …, wherein A, B, C, … … respectively represent specific power source phases of the power source, i is 1,2, … …, (T) _x /W)/2。

The logarithm of the couple generated by the disc-type switch reluctance motor can also be realized by selecting the energizing circulation sequence formed by different stator coils (4) positioned on the same ring. Selecting the couple of forces to be produced, e.g. cycling through the power A in the following order ₁ _A ₁ ′、B ₁ _B ₁ ′、C ₁ _C ₁ ′、A ₂ _A ₂ ′、B ₂ _B ₂ ′、C ₂ _C ₂ ′、……、A ₈ _A ₈ ′、B ₈ _B ₈ ′、C ₈ _C ₈ ' the output torque of each phase is 1 pair couple. The more couples of each phase of power supply are, the larger the output torque is, which is one of methods for improving the output torque of the disc type switch reluctance motor, and solves the technical problem that the output torque of the disc type switch reluctance motor can not break through the bottleneck for many years.

Thus, for a three-phase powered disc switched reluctance motor, the stator pole count/3/2=integer m=single phase couple logarithm may be designed. The couple pair of each phase power supply of this embodiment is 8, i.e., 8 couples. As shown in fig. 2, the cross-over is uniformly distributed. When A phase is electrified, all A _i _A _i ' all power on, then phase A is powered off and phase B is powered on, all of phase B _i _B _i ' all energized, and so on.

The closer the number of rotor poles is to the number of stator poles, the smaller the step angle, and the higher the accuracy of a single pulse of the switched reluctance motor. Taking the example motor as an example, the stator pole number 48 and the rotor pole number 32 of the example motor, when the rotor pole number is reduced two by two, the change rule of the step angle is shown in table 1.

TABLE 1

Number of stator poles	Phase angle of stator °	Number of rotor poles	Rotor phase angle degree	Step angle degree
					48	7.5	46	7.82608695	0.32608695
48	7.5	44	8.18181819	0.68181819
					48	7.5	42	8.57142857	1.07142857
48	7.5	40	9	1.5
					48	7.5	38	9.47368421	1.97368421
48	7.5	36	10	2.5
					48	7.5	34	10.58823529	3.08823529
48	7.5	32	11.25	3.75
					48	7.5	30	12	4.5
48	7.5	28	12.85714285	5.35714285
					48	7.5	26	13.84615384	6.34615384
48	7.5	24	15	7.5
					48	7.5	22	16.36363636	8.86363636
48	7.5	20	18	10.5
					48	7.5	18	20	12.5
48	7.5	16	22.5	15

The step angle is the angle that a rotor rotates from the start of power on to the stop of power on of a certain phase of magnetic pole in a stator of the disc-type switch reluctance motor. Step angle = rotor phase angle-stator phase angle, rotor phase angle = 360/number of rotor poles, stator phase angle = 360/number of stator poles.

In table 1, in the case where only the rotor pole numbers=32 and 16, the equation s= (T/W) ×j is satisfied, 8 pairs of force couples can be generated. In other cases, the motor can be manufactured into a disk reluctance motor, but no continuous couple pair is generated between the stator and the rotor, so that the motor has small output torque and loses use value.

Referring to fig. 4a, 4b, 4c and 4d, in order to clearly see the energizing operation of the disc-type switched reluctance motor of the present invention, the rotor 2 is scaled down to be within a ring formed by the stator coils 4 of one of the stators 1 in the four figures, and the stators are numbered 1,2 … and a counterclockwise number a _i 、B _i 、C _i ；A _i ′、B _i ^′ 、C _i ' j, (i=1, 2, …, the following); wherein A is _i -A _i ′、B _i -B _i ′、C _i -C _i ' collinear and passing through the axle center are a pair of couples.

Taking a 48/32 type motor as an example, in FIG. 4a, the initial position, A _i -A _i ' aligned with rotor poles 5 of rotor 2 numbered 2, 4, 6, …, 32, respectively, a _i -A _i ′、C _i -C _i ' power off, and B _i -B _i ' energized, 8 pairs total B _i -B _i ' all energized simultaneously, the rotor rotated clockwise through 3.75 ° to the position in fig. 4 b.

B _i -B _i ' aligned with rotor poles 5 of rotor 2 numbered 1, 3, 5, …, 31, respectively, A _i -A _i ′、B _i -B _i ' power off, and C _i -C _i ' energized, 8 pairs of C _i -C _i ' all simultaneously energized, rotor in timeThe needle is rotated through 3.75 deg. to the position in fig. 4 c.

C _i -C _i ' aligned with rotor poles 5 of rotor 2 numbered 2, 4, 6, …, 32, respectively, B _i -B _i ′、C _i -C _i ' Power off, and A _i -A _i ' energized, 8 pairs A _i -A _i ' all energized simultaneously, the rotor rotated clockwise through 3.75 ° to the position in fig. 4 d. Then return to A _i -A _i ' aligned with rotor poles 5 of rotor 2 numbered 1, 3, 5, …, 31, respectively, A _i -A _i ′、C _i -C _i ' power off, and B _i -B _i ' power on, and so on. Therefore, the disc-type switch reluctance motor can completely realize output torque by 8 pairs of couples, and breaks through the bottleneck of the output torque of the traditional motor.

Therefore, the disc-type switched reluctance motor of embodiment 1 is based on a double-stator structure of stator+rotor+stator, on one side of each stator 1 facing the rotor 2, a plurality of stator coils 4 are installed which are uniformly distributed around the axis of the stator 1 in a circle, and each stator coil 4 is installed with one stator pole 3; and a plurality of rotor poles 5 are installed on the circumference of the rotor 2 to be uniformly distributed around the axis of the rotor 2.

Example 2

As shown in fig. 5, in the disc-type switched reluctance motor of embodiment 2, on the basis of the double-stator structure of stator+rotor+stator of the disc-type switched reluctance motor of embodiment 1, axial multistage series connection is achieved, and the output torque can be increased approximately by times without a significant increase in volume. Axial multistage series connection of disc-type switched reluctance motors is the second method of improving output torque.

The disc-type switched reluctance motor may include a plurality of axial multistage series assemblies, each of which includes two newly added stators 1, and one newly added rotor 2 located between the two newly added stators 1; the axial multistage serial components form an axial multistage serial structure with the original two stators 1 and the original one rotor 2 through the bearings 6: stator+rotor+stator+stator +rotor+stator+ … ….

The stator 1+rotor 2+stator 1+stator 1+rotor 2+stator 1 shown in fig. 5 is two motor axial two-stage series connection, and so on, and axial multi-stage series connection can be realized on the basis of the design of the embodiment 1, and the output torque is improved approximately in a multiple way.

Example 3

The disc-type switched reluctance motor of embodiment 3 is based on the double-stator structure of stator+rotor+stator of the disc-type switched reluctance motor of embodiment 1, the structure of the stator, rotor is arranged in a plurality of concentric circles of magnetic poles in the radial direction so as to obtain a larger output torque.

As shown in fig. 6, the stator and the rotor may be arranged as more circles of magnetic poles, respectively, in the radial direction, as long as the size allows, and the number of magnetic poles of each circle satisfies the condition of constituting the couple satisfying the disc-type switched reluctance motor of embodiment 1. The stator magnetic poles of the outer ring on the stator correspond to the rotor magnetic poles of the outer ring on the rotor, and the stator magnetic poles of the inner ring on the stator correspond to the rotor magnetic poles of the inner ring on the rotor.

The power supply of the second ring magnetic pole, i.e. the inner ring magnetic pole, and the first ring magnetic pole, i.e. the outer ring magnetic pole, may be the same group of terminals of the same power supply, or may be different power supply terminals. That is, the stator coils 4 on different coils of the stator 1 can be powered by the same power supply or by different power supplies. If the same power supply terminal is used for the same group of power supply terminals, the torque phases output by the rotor magnetic poles of different circles are the same, if the power supply terminals are different, the torque phases output by the rotor magnetic poles of different circles can be the same or different, and it is meaningful that when the output phases are different, the output composite torque can significantly reduce torque fluctuation (which is one of the key points of the invention and is explained in detail below). On the basis of embodiment 1, the concentric circle arrangement of the magnetic poles of the stator and the rotor is the third method of improving the output torque.

Example 4

The disc-type switched reluctance motor of example 3, which has a plurality of poles, can be connected in series, and the disc-type switched reluctance motor of example 4 can be formed so as to obtain a larger output torque than just a plurality of poles. And fourthly, a method for improving output torque by multi-machine series connection of a plurality of circles of magnetic poles.

Example 5

Although the disc-type switched reluctance motor of the above embodiment improves the output torque, one of the main bottlenecks of the disc-type switched reluctance motor, namely torque ripple, cannot be overcome. It is found that, in the disc-type switched reluctance motor of embodiment 3, the magnetic poles of the concentric circles are arranged, each circle is powered by a separate power supply terminal, and the resultant output torque fluctuation can be effectively reduced by a reasonable phase angle between the power supply sources.

In the stator of the disc-type switched reluctance motor of embodiment 3, the first ring of magnetic pole coil, namely the outer ring of magnetic pole coil, the plurality of stator coils 4 are uniformly distributed on the side of the corresponding stator 1 facing the rotor 2 with the axis of the stator 1 as the center of a circle, and enclose a concentric ring structure of at least two rings; the rotor magnetic poles 5 are uniformly distributed in the rotor 2 by taking the axis of the rotor 2 as the circle center, and also enclose into at least two circles of concentric ring structures; the two ends of each rotor pole 5 penetrate through the opposite sides of the rotor 2 so that the enclosed shape can correspond to the enclosed shape of the plurality of stator coils 4 on the stators 1 on both sides. The cyclic energization sequence a illustrated in fig. 2 may be employed with the stator pole example ₁ _A ₁ ′、B ₁ _B ₁ ′、C ₁ _C ₁ ′、A ₂ _A ₂ ′、B ₂ _B ₂ ′、C ₂ _C ₂ ′、……、A ₈ _A ₈ ′、B ₈ _B ₈ ′、C ₈ _C ₈ ' at this time, the rotor output torque is schematically shown in FIG. 7a, at A ₁ The maximum torque is obtained at the moment of electrifying the magnetic poles, tangential force generated by magnetic flux change is smaller and smaller along with the rotation of the rotor, torque=tangential force is longer and smaller, when the magnetic poles of the rotor and the magnetic poles of the stator rotate to be in line with the rotating shaft, the tangential force generated by the magnetic flux is reduced to 0, and the torque=0; a is that ₁ Outage, B ₁ Power on, and so on.

The second-turn magnetic pole coil of the stator of the disc-type switched reluctance motor of example 3, i.e., the inner-turn magnetic pole coil, was also employed as shown in fig. 2Cycling energization sequence A for stator poles ₁ _A ₁ ′、B ₁ _B ₁ ′、C ₁ _C ₁ ′、A ₂ _A ₂ ′、B ₂ _B ₂ ′、C ₂ _C ₂ ′、……、A ₈ _A ₈ ′、B ₈ _B ₈ ′、C ₈ _C ₈ ' at this time, the rotor output torque is schematically shown in fig. 7 b. Δt is a phase difference between the second-turn magnetic pole coil and the first-turn magnetic pole coil when the second-turn magnetic pole coil is supplied with power alone, and a torque phase difference is caused by the power supply phase difference. Torque ripple occurs when the first or second magnetic pole coils are viewed independently.

Therefore, on the basis of the disc-type switched reluctance motor of embodiment 3, the initial phase angle difference Δt of the energization of the inner ring pole coil and the energization time of each phase of the power supply can be precisely controlled, and torque fluctuations can be significantly reduced. The more the number of turns of the magnetic pole, the more stable the resultant torque, and the torque ripple generated is significantly reduced. I.e. the stator coils 4 on the same winding are supplied with the same power supply, while the stator coils 4 on different windings are supplied with different power supplies and wherein there is a certain initial phase angle difference deltat in the supply phase of the stator coils 4 between the two windings.

The simulation experiment shows that when the outer-ring magnetic pole coil is independently powered, the output torque of the motor is fig. 7a, when the inner-ring magnetic pole coil is independently powered, the output torque of the motor is fig. 7b, and the design method for reducing torque fluctuation of the disc-type switched reluctance motor in embodiment 5 is adopted, that is, when the outer-ring magnetic pole coil and the inner-ring magnetic pole coil are powered together, a reasonable phase angle exists between the two power supplies, so that the resultant output torque fluctuation is effectively reduced, and the output torque of the motor is fig. 7c.

Example 6

Referring to fig. 5 again, in the disc-type switched reluctance motor of embodiment 6, based on the multistage series structure of the disc-type switched reluctance motor of embodiment 2, the resultant output torque fluctuation is effectively reduced by a reasonable phase angle between the power supplies of the pole coils of different turns on the stator. As shown in fig. 6, each axial multistage tandem assembly includes two newly added stators 1, and one newly added rotor 2 located between the two newly added stators 1; the axial multistage serial components form an axial multistage serial structure with the original two stators 1 and the original one rotor 2 through the bearings 6: stator+rotor+stator+stator +rotor+stator+ … ….

The disc-type switched reluctance motor of embodiment 6 adopts a multistage series structure and a multi-ring magnetic pole to obtain a structural design for remarkably reducing torque fluctuation, or a mixed structural design of the two, and can be applied to wind generators and hydraulic generators. At this time, the impeller driven by fluid energy (wind energy or hydraulic energy) is installed and manufactured on the outer edge of the impeller, the impeller rotor is driven by the fluid energy, the magnetic fluxes of the magnetic poles on the impeller rotor and the stator magnetic poles are periodically changed, and the stator magnetic pole coils generate periodically changed currents. The currents of the multiple rotors are combined and output, the amplitude of the output current is increased, the output amplitude of the combined current can be obviously reduced by the currents of the multiple rotors under the processing of the controller switching device, and the current fluctuation is reduced.

Example 7

The problem that the connection of the disc type switch reluctance motor is complex is difficult to solve, and if the connection of the disc type switch reluctance motor designed by the invention is also in a traditional connection mode, the connection is frosted on snow. In order to better bring products to the market, the invention carries out deep research and design on the wiring technology of the disc-type switch reluctance motor.

In embodiment 7, the basis of the disc-type switched reluctance motor of embodiment 1 is expanded, please refer to fig. 9, in order to facilitate the view of the wiring layout, a specific cable is shown, however, in practical application, the cable is embedded by forming a wiring groove on the stator, and then a coating material, such as a resin material, is used for trowelling, so that the cable cannot be seen in general. In addition, in order to facilitate the viewing of the connection terminal 9, the diameter of the connection ring is enlarged, and of course, in practical application, the diameter of the connection ring may be increased or decreased according to the actual situation.

Referring to fig. 10, 11, 12 and 13, an annular terminal plate is coaxially installed at the central region of each stator 1. Each ring-shaped terminal block includes a plurality of insulating terminal blocks 9 of a multilayer structure, and each terminal block 9 has a fan-shaped outer shape to be spliced into a ring-shaped one-turn terminal block 9, thereby forming one ring-shaped terminal block. At least two conductive pieces 93 electrically connected together are provided on each layer structure of each terminal block 9, and the conductive pieces 93 located on different layer structures are insulated from each other. The connection terminal 9 may be made of an insulating material, and in this embodiment, is an upper and lower insulating mounting structure. The upper insulating mounting structure 92 and the lower insulating mounting structure 91 are insulated from each other, and are respectively mounted with conductive sheets 93.

The width of each terminal strip 9 decreases from layer to layer, and each layer has a conductive sheet 93 at each end, as shown in fig. 12, so that the conductive sheet 93 at each end of each layer can be seen in front projection of the corresponding terminal strip 9, as shown in fig. 13. The conductive strips 93 exposed by the same terminal block 9 are arranged in a straight line in the diameter direction of the annular terminal block on the front projection.

In the same annular wiring terminal plate, all terminal rows 9 are divided into a plurality of groups in turn by taking the phase number of the power supply as a unit, so that each phase of the power supply is connected with one terminal row 9 of each group of terminal rows 9. When the annular wiring terminal plate is connected, each phase of the power supply is powered by adopting a mode of one inlet bus and one outlet bus, the two buses of each phase are connected with the stator coil 4 in a wiring way by a star-shaped wiring way at the inner side of the annular wiring terminal plate, and all the stator coils 4 forming the couple pair of the phase are connected to the buses of the phase in parallel. As in the present embodiment, the A, B, C three phases share a bus: a+, A-, B+, B-, C+, C-. In the disc-type switched reluctance motor of example 1, the number of stator poles is 48, the number of rotor poles is 32, and the total number of ring-shaped terminal blocks in fig. 12 is 48×2=96 connection terminals, 96 wires. The connection terminal 9 is input A, B, C from a driver, as shown in a wiring schematic diagram of a phase a in fig. 14, two buses of each phase are distributed along the inner side of the annular connection terminal disc to form a plurality of concentric rings, each phase has 2 buses, one wire is output from the driver, and the other wire is returned to the driver, so that the stator coils 4 which are required to be electrically connected with the phase a are connected in parallel. According to the wiring mode of the phase A, the equivalent circuit diagram is applied to the phase B and the phase C, as shown in fig. 15, and each stator coil 4 is connected in parallel under the corresponding power phase. Therefore, even if one of the stator coils 4 has a problem, the on-off of the other stator coils 4 can not be influenced, and the annular wiring mode of fig. 14 can greatly form an effective wiring rule, is convenient for subsequent maintenance, and can simplify wiring.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims

1. A disc-type switched reluctance motor comprises two stators (1), a rotor (2) positioned between the two stators (1), and a bearing (6) coaxially connecting the two stators (1) and the rotor (2); a plurality of stator coils (4) are arranged on each stator (1), one stator magnetic pole (3) is arranged on each stator coil (4), and a plurality of rotor magnetic poles (5) are arranged on the rotor (2); the method is characterized in that:

the plurality of stator coils (4) are uniformly distributed on one side of the corresponding stator (1) facing the rotor (2) by taking the axis of the stator (1) as the center of a circle, and enclose into at least two circles of concentric ring structures; the rotor magnetic poles (5) are uniformly distributed in the rotor (2) by taking the axis of the rotor (2) as the circle center, and also enclose into at least two circles of concentric ring structures; two ends of each rotor magnetic pole (5) penetrate through two opposite sides of the rotor (2) so that the enclosed shape can correspond to the enclosed shape of a plurality of stator coils (4) on the stators (1) at two sides;

the number of stator poles on the x-th ring on the stator (1) and the number of rotor poles on the x-th ring on the rotor (2) satisfy the following relationship in the order from the outer ring to the inner ring: one, S _x ＝(T _x (W) ×j, where S _x Is the number of rotor magnetic poles on the x-th ring of the rotor (2), T _x The number of the stator magnetic poles on the x-th ring on the stator (1) is an even number, W is the number of power supply phases, and j is a positive integer; secondly, the number of rotor magnetic poles on the xth ring of the rotor (2) is ensured<The number of stator poles on the x-th ring on the stator (1);

the stator coils (4) on the same circle are powered by the same power supply, the stator coils (4) on different circles are powered by different power supplies, and the power supply phases of the stator coils (4) between the two circles have a certain initial phase angle difference delta T.

2. The disc switched reluctance motor of claim 1 wherein: the rotor magnetic poles (5) of the outermost ring on the rotor (2) uniformly encircle the circumference of the rotor (2).

3. The disc switched reluctance motor of claim 1 wherein: the stator coils (4) on the same ring are divided into T in turn by W number _x Each group of stator coil groups is respectively connected with different phases of a power supply in sequence; the stator coils (4) are distributed in a central symmetry along one diameter of the stator (1), and two stator magnetic poles (3) on the same diameter form a common-diameter magnetic pole which is used as a pair of couples for driving the corresponding rotor to rotate.

4. A disc switched reluctance machine as claimed in claim 3, wherein: to produce (T) _x The energizing cycle sequence of the stator coils (4) on the same ring is as follows: a is that _i _A _i ′、B _i _B _i ′、C _i _C _i ', … …, wherein A, B, C, … … respectively represent specific power source phases of the power source, i is 1,2, … …, (T) _x /W)/2。

5. A disc switched reluctance machine as claimed in claim 3, wherein: the couple pair for driving the disc-type switch reluctance motor to continuously rotate is realized by selecting the energizing circulation sequence formed by different stator coils (4) positioned on the same ring.

6. The disc switched reluctance motor of claim 1 wherein: the disc-type switch reluctance motor also comprises a plurality of axial multistage series components, wherein each axial multistage series component comprises two newly added stators (1) and one newly added rotor (2) positioned between the two newly added stators (1); the axial multistage serial components form an axial multistage serial structure with the original two stators (1) and the original one rotor (2) through the bearings (6): stator+rotor+stator+stator +rotor+stator+ … ….

7. A design method for reducing torque fluctuation of a disc type switch reluctance motor comprises two stators (1), a rotor (2) positioned between the two stators (1), and a bearing (6) coaxially connecting the two stators (1) and the rotor (2); a plurality of stator coils (4) are arranged on each stator (1), one stator magnetic pole (3) is arranged on each stator coil (4), and a plurality of rotor magnetic poles (5) are arranged on the rotor (2); the method is characterized in that: the plurality of stator coils (4) are uniformly distributed on one side of the corresponding stator (1) facing the rotor (2) by taking the axis of the stator (1) as the center of a circle, and enclose into at least two circles of concentric ring structures; the rotor magnetic poles (5) are uniformly distributed in the rotor (2) by taking the axis of the rotor (2) as the circle center, and also enclose into at least two circles of concentric ring structures; two ends of each rotor magnetic pole (5) penetrate through two opposite sides of the rotor (2) so that the enclosed shape can correspond to the enclosed shape of a plurality of stator coils (4) on the stators (1) at two sides;

the design method for reducing torque fluctuation comprises the following steps:

the stator coils (4) on the same circle are powered by the same power supply, the stator coils (4) on different circles are powered by different power supplies, and a certain phase angle difference delta T exists in the power supply phase of the stator coils (4) between two circles.

8. The method of designing a disc-type switched reluctance motor for reducing torque ripple as claimed in claim 7, wherein: the stator coils (4) on the same ring are divided into T in turn by W number _x Each group of stator coil groups is respectively connected with different phases of a power supply in sequence; the stator coils (4) are distributed in a central symmetry along one diameter of the stator (1), and two stator magnetic poles (3) on the same diameter form a common-diameter magnetic pole which is used as a pair of couples for driving the corresponding rotor to rotate.

9. The method of designing a disc-type switched reluctance motor for reducing torque ripple as claimed in claim 7, wherein: to produce (T) _x The energizing cycle sequence of the stator coils (4) on the same ring is as follows: a is that _i _A _i ′、B _i _B _i ′、C _i _C _i ', … …, wherein A, B, C, … … respectively represent specific power source phases of the power source, i is 1,2, … …, (T) _x /W)/2。

10. The method of designing a disc-type switched reluctance motor for reducing torque ripple as claimed in claim 7, wherein: the disc-type switched reluctance motor is as claimed in claim 2 or 5 or 6.