Outer rotor permanent magnet excitation inductor motor with magnetism adjusting ring

Abstract

The utility model relates to an outer rotor permanent magnet excitation inductor motor with a magnetism adjusting ring, which comprises two claw pole outer rotors which are oppositely arranged, a stator is coaxially arranged on the inner sides of the claw pole outer rotors, and the stator comprises a stator yoke part, a stator iron core, a stator back yoke and an armature winding; permanent magnet steel is uniformly distributed on the two sides of the stator yoke part, the two permanent magnet steel is magnetized along the axial direction, and the magnetizing directions are consistent; the stator back yoke is arranged on the outer end faces of the two permanent magnet steel, the stator yoke part and the inner side of the permanent magnet steel are of a hollow structure, and two magnet adjusting rings capable of axially moving are arranged in the hollow structure; the stator back yoke and the two adjustable magnetic rings are made of magnetic conductive materials. By ingeniously designing the inner side stator structure of the claw-pole outer rotor and the position of the magnet adjusting ring, the axial relative position of the magnet adjusting ring and the permanent magnet steel can be flexibly adjusted, so that the no-load magnetic field and no-load counter electromotive force of the motor can be adjusted, and the permanent magnet motor has the advantages of simplicity in magnet adjustment, low idling loss, high power density and easiness in integration with the flywheel rotor.

Description

TECHNICAL FIELD

[0001] The utility model relates to special motor technical field, concretely relates to a kind of outer rotor permanent magnet excitation induction sub-motor with magnetic ring, it is applicable to power system energy storage motor and synchronous phase-modulating motor. BACKGROUND

[0002] Compared with traditional motor, induction sub-motor has the advantages of simple rotor structure and high reliability, and has a wide application in new energy power system. According to the different rotor structures, induction sub-motor is divided into inner rotor induction sub-motor and outer rotor induction sub-motor. Among them, the air gap magnetic field of inner rotor induction sub-motor is single polarity. The air gap magnetic field of outer rotor induction sub-motor is bipolar, and the magnetic field utilization rate is high. Compared with inner rotor induction sub-motor, outer rotor induction sub-motor has higher power density. When induction sub-motor is used in power grid flywheel energy storage system, in order to reduce the idling load loss, permanent magnet excitation and mechanical magnetic adjustment method are needed. At present, the existing permanent magnet excitation mechanical magnetic adjustment induction sub-motor is inner rotor induction sub-motor, which cannot take into account the advantages of outer rotor induction sub-motor. Therefore, the utility model provides an outer rotor permanent magnet excitation induction sub-motor with magnetic ring. SUMMARY

[0003] The utility model provides an outer rotor permanent magnet excitation induction sub-motor with magnetic ring.

[0004] The specific technical scheme has the following two:

[0005] The first technical scheme: an outer rotor permanent magnet excitation induction sub-motor with magnetic ring, comprising two oppositely arranged claw pole outer rotors, the inner side of the claw pole outer rotor is coaxially arranged with a stator, the stator comprises a stator yoke, a stator core, a stator back yoke and an armature winding;The stator yoke is evenly arranged with permanent magnet magnetic steel on both sides, two permanent magnet magnetic steels are magnetized along the axial direction, and the magnetization directions are consistent;The stator back yoke is arranged on the outer end face of the two permanent magnet magnetic steels, the stator yoke and the permanent magnet magnetic steel inside are hollow structure, and two axially movable magnetic adjustment rings are arranged in the hollow structure;The stator back yoke and the two magnetic adjustment rings are made of magnetic conductive material.

[0006] Further, preferably, the two magnetic adjustment rings are axially moved by adjusting mechanism, the adjusting mechanism comprises a lead screw and a stepper motor, one end of the lead screw is connected to the outer end face of the magnetic adjustment ring, the other end passes through the stator back yoke and the stepper motor in sequence, and the stepper motor is arranged on the outer end face of the stator back yoke.

[0007] The second technical solution is an outer rotor permanent magnet excitation inductor motor with a magnetic adjusting ring, comprising two oppositely arranged claw pole rotors, the inner side of the claw pole rotors is coaxially arranged with a stator, the stator comprises a stator yoke, a stator core, a stator back yoke and an armature winding; the stator yoke is arranged with permanent magnet magnetic steel on both sides, the two permanent magnet magnetic steels are magnetized along the axial direction and have the same magnetization direction; the stator back yoke is arranged on the outer end surface of the two permanent magnet magnetic steels, the inner side of the stator yoke is a solid structure, the inner side of the stator back yoke and the permanent magnet magnetic steel is a hollow structure, and the hollow structure is arranged with two axially movable magnetic adjusting rings; the stator back yoke and the two magnetic adjusting rings are both magnetic conductive materials.

[0008] Further, preferably, the two magnetic adjusting rings are axially moved through an adjusting mechanism, the adjusting mechanism comprises a lead screw and a stepping motor, one end of the lead screw is connected to the outer end surface of the magnetic adjusting ring, the other end passes through the end cover and the stepping motor in sequence, and the stepping motor is arranged on the outer end surface of the end cover.

[0009] Further, preferably, the outer surface of the magnetic adjusting ring of the two technical solutions is further provided with a thin oil film paper.

[0010] Specifically, the stator core of the two technical solutions is arranged on the outer side of the stator yoke, and the armature winding is arranged in the slot of the stator core in an axial interval.

[0011] The utility model discloses the beneficial effects are: the utility model discloses the inside stator structure of claw pole rotor is designed ingeniously, sets up permanent magnet magnetic steel on both sides of stator yoke, sets the position of magnetic adjusting ring to the hollow and solid structure of stator yoke, and the axial position of magnetic adjusting ring is adjusted through the corresponding adjusting device, thereby realizing the axial relative position adjustment of magnetic adjusting ring and permanent magnet magnetic steel, adjusting the no-load magnetic field and no-load counter electromotive force of motor, has the advantages such as simple magnetic adjustment, low machine loss, simple structure, high reliability, and plays a substantial promoting role to the popularization and application of outer rotor inductor motor, makes it give full play to the advantages of high power density, easy integration with flywheel rotor, and is very suitable for application in power system energy storage motor and synchronous phase-modulating motor. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the structural schematic diagram of example 1;

[0013] Figure 2 It is the side view of example 1;

[0014] Figure 3 It is the structural schematic diagram of example 2;

[0015] Figure 4 It is the side view of example 2;

[0016] Figure 5The open circuit and short circuit no-load flux linkage of the motor is shown in the following table:

[0017] Figure 6 The open circuit and short circuit no-load iron loss of the motor is shown in the following table:

[0018] In the figure: 1-claw pole outer rotor; 201-stator yoke, 202-stator core, 203-stator back yoke, 204-armature winding; 3-permanent magnet; 4-magnetic adjusting ring; 501-screw rod, 502-stepping motor; 6-end cover. DETAILED DESCRIPTION

[0019] In order to make the technical problems and technical solutions solved by the utility model more clear and explicit, the utility model is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0020] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only used to facilitate the description of the utility model, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0021] In the description of the utility model, it should also be explained that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected, can be mechanically connected, or can be electrically connected, can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. Example 1

[0022] As Figure 1 Figure 2As shown, the embodiment provides an outer rotor permanent magnet excited inductor motor with magnetic adjusting ring, which comprises two oppositely arranged claw pole rotors 1, the inner side of the claw pole rotor 1 is coaxially provided with a stator, the stator comprises a stator yoke 201, a stator core 202, a stator back yoke 203 and an armature winding 204; the stator yoke 201 is provided with permanent magnet steel 3 on both sides, the two permanent magnet steels 3 are magnetized along the axial direction and have the same magnetization direction; the stator back yoke 203 is arranged on the outer end surface of the two permanent magnet steels 3, the stator yoke 201 and the permanent magnet steel 3 are hollow structures, and the hollow structures are provided with two axially movable magnetic adjusting rings 4; the stator back yoke 203 and the two magnetic adjusting rings 4 are both magnetic conductive materials.

[0023] Wherein, the two magnetic adjusting rings 4 are axially moved through the adjusting mechanism, the adjusting mechanism comprises a lead screw 501 and a stepping motor 502, one end of the lead screw 501 is connected to the outer end surface of the magnetic adjusting ring 4, the other end passes through the stator back yoke 203 and the stepping motor 502 in sequence, and the stepping motor 502 is arranged on the outer end surface of the stator back yoke 203. When the two magnetic adjusting rings 4 need to be adjusted, the stepping motor 502 works to drive the lead screw 501 to move back and forth, thereby driving the magnetic adjusting ring 4 to move back and forth along the axial direction, and by controlling the rotation direction of the left and right two stepping motors 502, the two magnetic adjusting rings 4 can be simultaneously moved inward to approach each other, thereby being staggered with the permanent magnet steel 3, or moved outward to move away from each other, thereby being overlapped with the permanent magnet steel 3, so as to adjust the axial relative position between the magnetic adjusting ring 4 and the permanent magnet steel 3, and adjust the no-load magnetic field and the no-load back electromotive force of the motor.

[0024] As preferred, the outer surface of the magnetic adjusting ring 4 is further provided with a thin oil film paper, and the thickness of the thin oil film paper should be as small as possible, so that the no-load iron loss of the motor at idle can be as small as possible. The oil film paper can also reduce the axial displacement resistance of the magnetic adjusting ring 4, facilitating the position adjustment.

[0025] In addition, the stator core 202 is arranged on the outer side of the stator yoke 201, and the armature winding 204 is axially spaced arranged in the slot of the stator core 202.

[0026] When the motor is used for power system synchronous phase modulation motor, the working principle of the motor is that the armature winding 204 of the motor stator is connected to the power grid, and the motor input active power is always zero when the motor output shaft is idle, the motor loss and the rotor mechanical transient process are ignored. By adjusting the axial position of the magnetic adjusting ring 4, the no-load back electromotive force amplitude of the motor can be adjusted, so that the reactive power of the motor can be arbitrarily adjusted.

[0027] When the motor is used for power system energy storage motor, the motor working principle is: when the motor idles, the two magnetic adjusting rings 4 are simultaneously moved to the outside to overlap the permanent magnet magnetic steel 3, at this time the magnetic adjusting ring 4 will short-circuit the magnetic motive force of the permanent magnet magnetic steel 3, the motor no-load magnetic field is very small, and the motor no-load loss is very low; when the motor needs to be accelerated or generate electricity, the two magnetic adjusting rings 4 are moved to the inside to move away from the permanent magnet magnetic steel 3, at this time the magnetic adjusting ring 4 has little effect on the motor magnetic circuit, and the motor no-load back electromotive force is a normal value.

[0028] In order to verify the effect of the utility model, a force finite element simulation model is established for simulation calculation. Figure 1 As shown in the motor, the open circuit and short circuit no-load winding flux linkage and motor no-load iron loss of the outer rotor permanent magnet excitation inductor motor with the magnetic adjusting ring are respectively as shown in Figure 4 、 Figure 5 It can be seen that the motor no-load winding flux linkage has good adjustable performance, the motor no-load iron loss is much smaller when the magnetic adjusting ring is in the short circuit position than in the open circuit position, and therefore the motor is particularly suitable for use in power system energy storage motor and synchronous phase modulation motor. Embodiment 2

[0029] As shown in the motor, the open circuit and short circuit no-load winding flux linkage and motor no-load iron loss of the outer rotor permanent magnet excitation inductor motor with the magnetic adjusting ring are respectively as shown in Figure 3 Figure 4 The embodiment provides an outer rotor permanent magnet excitation inductor motor with a magnetic adjusting ring, which is different from the above-mentioned embodiment in that the inside of the stator yoke part 201 is a solid structure, the inside of the stator back yoke 203 and the permanent magnet magnetic steel 3 is a hollow structure, and two axially movable magnetic adjusting rings 4 are arranged in the hollow structure.

[0030] Further, due to the difference in the above structure, the corresponding adjusting mechanism setting position is also different, specifically, one end of the lead screw 501 is connected to the outer end face of the magnetic adjusting ring 4, and the other end sequentially penetrates the end cover 6 and the stepping motor 502, and the stepping motor 502 is arranged on the outer end face of the end cover 6. When the two magnetic adjusting rings 4 need to be adjusted, the stepping motor 502 works to drive the lead screw 501 to move forward and backward, thereby driving the magnetic adjusting ring 4 to move forward and backward along the axial direction, and specifically by controlling the rotation directions of the left and right two stepping motors 502, the two magnetic adjusting rings 4 can be simultaneously moved to the inside to approach each other to the stator yoke part 201, thereby overlapping the permanent magnet magnetic steel 3, or moved to the outside to move away from the stator yoke part 201, thereby being staggered with the permanent magnet magnetic steel 3, so as to realize the adjustment of the axial relative position between the magnetic adjusting ring 4 and the permanent magnet magnetic steel 3, and adjust the no-load magnetic field and the no-load back electromotive force of the motor.

[0031] The utility model is described in detail above through specific and preferred embodiments, but the person skilled in the art should understand that the utility model is not limited to the above-mentioned embodiments, and any modification, equivalent replacement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An external rotor permanent magnet excited induction motor having a field shaping ring, characterized by: The application relates to a claw-pole outer rotor (1) comprising two oppositely arranged claw-pole outer rotors (1), the inner side of the claw-pole outer rotor (1) is coaxially provided with a stator, the stator comprises a stator yoke (201), a stator core (202), a stator back yoke (203) and an armature winding (204); the stator yoke (201) is provided with permanent magnet steel (3) on both sides, the two pieces of permanent magnet steel (3) are magnetized along the axial direction and the magnetization directions are consistent; the stator back yoke (203) is arranged on the outer end surface of the two pieces of permanent magnet steel (3), the stator yoke (201) and the permanent magnet steel (3) on the inner side are hollow structures, and two axially movable magnetic adjusting rings (4) are arranged in the hollow structures; the stator back yoke (203) and the two magnetic adjusting rings (4) are both made of magnetic conductive material.

2. The outer rotor permanent magnet field-excited motor with a flux modulation ring according to claim 1, characterized in that: The two magnetic adjusting rings (4) are axially moved through an adjusting mechanism, the adjusting mechanism comprises a lead screw (501) and a stepping motor (502), one end of the lead screw (501) is connected to the outer end surface of the magnetic adjusting ring (4), the other end sequentially penetrates through the stator back yoke (203) and the stepping motor (502), and the stepping motor (502) is arranged on the outer end surface of the stator back yoke (203).

3. An external rotor permanent magnet excited induction motor having a field shaping ring, characterized by: The application relates to a claw-pole outer rotor (1) comprising two oppositely arranged claw-pole outer rotors (1), the inner side of the claw-pole outer rotor (1) is coaxially provided with a stator, the stator comprises a stator yoke (201), a stator core (202), a stator back yoke (203) and an armature winding (204); the stator yoke (201) is provided with permanent magnet steel (3) on both sides, the two pieces of permanent magnet steel (3) are magnetized along the axial direction and the magnetization directions are consistent; the stator back yoke (203) is arranged on the outer end surface of the two pieces of permanent magnet steel (3), the inner side of the stator yoke (201) is a solid structure, the inner side of the stator back yoke (203) and the permanent magnet steel (3) is a hollow structure, and two axially movable magnetic adjusting rings (4) are arranged in the hollow structure; the stator back yoke (203) and the two magnetic adjusting rings (4) are both made of magnetic conductive material.

4. The outer rotor permanent magnet field-excited motor with a flux modulation ring according to claim 3, characterized in that: The two magnetic adjusting rings (4) are axially moved through an adjusting mechanism, the adjusting mechanism comprises a lead screw (501) and a stepping motor (502), one end of the lead screw (501) is connected to the outer end surface of the magnetic adjusting ring (4), the other end sequentially penetrates through the stator back yoke (203) and the stepping motor (502), and the stepping motor (502) is arranged on the outer end surface of the stator back yoke (203).

5. The external rotor permanent magnet field excited induction machine with flux modulation rings of any of claims 1-4, characterized in that: A layer of thin oil film paper is further arranged on the outer surface of the magnetic adjusting ring (4).

6. The external rotor permanent magnet field excited induction machine with flux modulation rings of claim 5, wherein: The stator core (202) is arranged on the outer side of the stator yoke (201), and the armature winding (204) is axially and spacedly arranged in the slot of the stator core (202).

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