Rotor structure of permanent magnet auxiliary synchronous reluctance motor with unequal air gaps

Abstract

The utility model relates to a rotor structure of a permanent magnet auxiliary synchronous reluctance motor with unequal air gaps, which is structurally characterized in that a rotating shaft is sleeved with first rotor iron cores and second rotor iron cores with the same number, the first rotor iron cores and the second rotor iron cores are alternately sleeved, and the outer diameter of each first rotor iron core is larger than that of each second rotor iron core. And a first permanent magnet and a second permanent magnet which are made of different materials are respectively arranged in the magnetic steel grooves of the first rotor core and the second rotor core. The utility model has the advantages that the structure design is reasonable, the power density problem of the motor can be solved, the power density of the motor can be improved on the premise of keeping the original performance of the motor, and copper and iron materials used for manufacturing the motor can be reduced by adding a proper amount of preferable ferrite and neodymium iron boron permanent magnet materials. The produced motor has the speed regulation performance of a synchronous reluctance motor, and has a high-efficiency area which is the same as that of the synchronous reluctance motor under the condition of variable load.

Description

Technical Field

[0001] The utility model relates to a motor rotor structure, in particular to a unequal air gap permanent magnet assisted synchronous reluctance motor rotor structure. Background Art

[0002] With the development of power electronics technology, the control algorithm of synchronous reluctance has become more mature, and synchronous reluctance motors have also been widely used, and have been well applied in wide speed regulation range and variable load application scenarios.

[0003] However, due to the limitations of motor principles, the existing synchronous reluctance motor relies entirely on the reluctance effect to generate the required torque. The motor excitation current is large, the power density is low, the motor uses more copper and iron materials, and the motor is large in size, resulting in high production costs and limited application scope. Utility Model Content

[0004] The utility model proposes a rotor structure of an unequal air gap permanent magnet assisted synchronous reluctance motor, which aims to overcome the above-mentioned shortcomings of the existing technology, improve the motor power density and reduce production costs while maintaining the original performance of the motor.

[0005] The technical solution of the present utility model is a rotor structure of a permanent magnet assisted synchronous reluctance motor with unequal air gaps, which includes a rotor pressure ring, a magnetic steel pressure plate, a first rotor core, a second rotor core, a rotating shaft, a first permanent magnet, and a second permanent magnet. The rotating shaft is provided with an equal number of first and second rotor cores, which are alternately arranged. The outer diameter of the first rotor core is larger than that of the second rotor core. Magnetic steel pressure plates are respectively arranged on the rotating shaft outside the outermost first and second rotor cores, and rotor pressure rings are respectively arranged on the rotating shaft outside the magnetic steel pressure plates on both sides. This realizes rotor cores with different air gaps.

[0006] Preferably, the magnetic steel slots of the first and second rotor cores are respectively provided with first and second permanent magnets, and the first and second permanent magnets are made of different materials. This effectively improves the power density of the motor and reduces the use of copper and iron materials in the motor. Furthermore, the combination of permanent magnets of different materials and rotor core outer diameters allows the ratio between the motor's permanent magnet torque and reluctance torque to be adjusted, resulting in the motor having the speed regulation performance of a synchronous reluctance motor.

[0007] Preferably, the thickness of the first permanent magnet is greater than the thickness of the second permanent magnet.

[0008] Preferably, there are five groups of the first rotor cores and five groups of the second rotor cores respectively.

[0009] Preferably, the outer diameter of the first rotor core is 1.4 mm larger than the outer diameter of the second rotor core.

[0010] Preferably, the first permanent magnet is a ferrite permanent magnet, and the second permanent magnet is a neodymium iron boron permanent magnet.

[0011] Preferably, the thickness of the first permanent magnet is twice the thickness of the second permanent magnet.

[0012] The advantages of this utility model include a rational structural design that solves the problem of motor power density, improving the motor's power density while maintaining its original performance. By adding an appropriate amount of optimal ferrite and NdFeB permanent magnet materials, the amount of copper and iron used in motor manufacturing can be reduced. The resulting motor has the speed regulation performance of a synchronous reluctance motor and maintains the same high-efficiency range under variable load conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the rotor structure of the unequal air gap permanent magnet assisted synchronous reluctance motor of the utility model.

[0014] In the figure, 1 is the rotor pressure ring, 2 is the magnetic steel pressure plate, 3 is the first rotor core, 4 is the second rotor core, 5 is the rotating shaft, 6 is the first permanent magnet, and 7 is the second permanent magnet. DETAILED DESCRIPTION

[0015] The present invention will be further described in detail below with reference to the embodiments and specific implementation methods.

[0016] like Figure 1 As shown, a rotor structure of an unequal air gap permanent magnet assisted synchronous reluctance motor is shown, which includes a rotor pressure ring 1, a magnetic steel pressure plate 2, a first rotor core 3, a second rotor core 4, a rotating shaft 5, a first permanent magnet 6 and a second permanent magnet 7, wherein the rotating shaft 5 is sleeved with the same number of first rotor cores 3 and second rotor cores 4, and the first rotor cores 3 and the second rotor cores 4 are sleeved alternately. The outer diameter of the first rotor core 3 is larger than the outer diameter of the second rotor core 4, and the first permanent magnet 6 and the second permanent magnet 7 are respectively provided in the magnetic steel slots of the first rotor core 3 and the second rotor core 4. The first permanent magnet 6 and the second permanent magnet 7 are made of different materials, and the thickness of the first permanent magnet 6 is greater than the thickness of the second permanent magnet 7. The magnetic steel pressure plates 2 are respectively sleeved on the rotating shafts 5 outside the outermost first rotor cores 3 and the second rotor cores 4, and the rotor pressure rings 1 are respectively sleeved on the rotating shafts 5 outside the magnetic steel pressure plates 2 on both sides.

[0017] During processing, first place the first permanent magnet 6 and the second permanent magnet 7 in the magnetic steel slots of the first rotor core 3 and the second rotor core 4 respectively, and fix them with glue respectively. First, put the magnetic steel pressure plate 2 on one side on the rotating shaft 5, and then alternately put the first rotor core 3 and the second rotor core 4, and then put the magnetic steel pressure plate 2 on the other side. Finally, fix the entire rotor core with the rotor pressure ring 1 at both ends.

[0018] The above rotor structure has two different rotor outer diameters, and the permanent magnet materials in the rotor cores with different air gaps are also different. The addition of permanent magnets can effectively improve the power density of the motor and reduce the use of copper and iron materials in the motor. The permanent magnets of different materials are combined with different rotor core outer diameters to adjust the ratio between the permanent magnet torque and the reluctance torque of the motor, so that the motor has the corresponding speed regulation performance of a synchronous reluctance motor. Example

[0019] There are five groups of first rotor cores 3 and second rotor cores 4 respectively. The outer diameter of the first rotor core 3 is 1.4 mm larger than that of the second rotor core 4. The first permanent magnet 6 is a ferrite permanent magnet, and the second permanent magnet 7 is a neodymium iron boron permanent magnet. The thickness of the first permanent magnet 6 is twice that of the second permanent magnet 7.

[0020] The components described above are all prior art, and those skilled in the art can use any model and existing design that can achieve their corresponding functions.

[0021] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A rotor structure of a unequal air gap permanent magnet assisted synchronous reluctance motor, characterized in that: The invention comprises a rotor pressure ring (1), a magnetic steel pressure plate (2), a first rotor core (3), a second rotor core (4), a rotating shaft (5), a first permanent magnet (6) and a second permanent magnet (7), wherein the rotating shaft (5) is sleeved with the same number of first rotor cores (3) and second rotor cores (4), the first rotor cores (3) and the second rotor cores (4) are sleeved alternately, the outer diameter of the first rotor core (3) is larger than the outer diameter of the second rotor core (4), the rotating shaft (5) outside the outermost first rotor core (3) and the second rotor core (4) are sleeved with magnetic steel pressure plates (2), and the rotating shaft (5) outside the magnetic steel pressure plates (2) on both sides are sleeved with rotor pressure rings (1).

2. The unequal air gap permanent magnet assisted synchronous reluctance motor rotor structure according to claim 1, characterized in that: A first permanent magnet (6) and a second permanent magnet (7) are respectively provided in the magnetic steel slots of the first rotor core (3) and the second rotor core (4); the first permanent magnet (6) and the second permanent magnet (7) are made of different materials.

3. The unequal air gap permanent magnet assisted synchronous reluctance motor rotor structure according to claim 2, characterized in that: The thickness of the first permanent magnet (6) is greater than the thickness of the second permanent magnet (7).

4. The unequal air gap permanent magnet assisted synchronous reluctance motor rotor structure according to claim 2 or 3, characterized in that: There are five groups of the first rotor iron cores (3) and the second rotor iron cores (4) respectively.

5. The unequal air gap permanent magnet assisted synchronous reluctance motor rotor structure according to claim 4, characterized in that: The outer diameter of the first rotor iron core (3) is 1.4 mm larger than the outer diameter of the second rotor iron core (4).

6. The unequal air gap permanent magnet assisted synchronous reluctance motor rotor structure according to claim 5, characterized in that: The first permanent magnet (6) is a ferrite permanent magnet, and the second permanent magnet (7) is a neodymium iron boron permanent magnet.

7. The unequal air gap permanent magnet assisted synchronous reluctance motor rotor structure according to claim 6, characterized in that: The thickness of the first permanent magnet (6) is twice the thickness of the second permanent magnet (7).

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