CN106411007A - Rotor with quasi-V-shaped magnetic steel structures and suitable for high-performance motor - Google Patents

Abstract

The invention discloses a quasi-V-shaped magnet-steel structure rotor suitable for high-performance motors, which comprises a main rotor core, a quasi-V-shaped magnetic steel and an auxiliary rotor core arranged outside the main rotor core, and the main rotor core is hollow. structure, a plurality of teeth are arranged on the outside, and a quasi-V-shaped magnetic steel structure composed of a quasi-V-shaped magnetic steel and an auxiliary rotor core is arranged between two adjacent teeth. There are cooling channels between the outer surfaces. Compared with the rotor of the existing permanent magnet motor, the present invention has large air gap magnetic flux density, small cogging torque and low harmonic; high saliency ratio, which is beneficial to field weakening control; effectively avoids short circuit of magnetic circuit, leakage Fewer magnets; provides cooling channels for enhanced temperature control.

Description

A quasi-V-shaped magnet-steel structure rotor suitable for high-performance motors

technical field

The invention belongs to the field of high-efficiency motors and relates to a quasi-V-shaped magnetic steel structure rotor suitable for high-performance motors.

Background technique

Motors are the driving devices of various equipment such as fans, pumps, compressors, machine tools, and conveyor belts. They are widely used in many industries and fields such as metallurgy, petrochemicals, chemicals, coal, building materials, and public facilities. They are the largest consumers of electricity. electrical machinery. According to statistics, in 2011, my country's motor holdings were about 1.7 billion kilowatts, and the total power consumption was about 3 trillion kwh, accounting for 64% of the total electricity consumption of the whole society, of which the total power consumption of motors in the industrial field was 2.6 trillion Kilowatt hours, which account for about 75% of industrial electricity consumption.

In recent years, with the support of national policies, the energy efficiency level of motors in my country has gradually improved, but the overall energy efficiency level is still low. From the perspective of the motor itself, the average efficiency of motors in my country is 3-5 percentage points lower than that of foreign countries, and the high-efficiency motors currently in use account for only about 3%; The efficiency is 10-20 percentage points lower than the foreign advanced level. Extensive use of low-efficiency motors causes huge waste of electricity. Every one percentage point increase in the energy efficiency of motors in the industrial field can save about 26 billion kWh of electricity per year. By promoting high-efficiency motors, eliminating low-efficiency motors in use, efficient remanufacturing of low-efficiency motors, and matching energy-saving transformation of the motor system according to its load characteristics and operating conditions, the overall efficiency of the motor system can be improved by 5-8 percentage point, the annual power saving can be 130-230 billion kWh, which is equivalent to the power generation of 2-3 Three Gorges Power Stations.

From an international point of view, in the face of a development environment with tighter resource constraints, major developed countries in the world will improve the energy efficiency of motors as an important energy-saving measure. In 2008, the International Electrotechnical Commission (IEC) formulated a globally unified motor energy efficiency classification standard and unified test methods; the United States began to enforce high-efficiency motors in 1997, and in 2011 it also mandated the implementation of ultra-efficient motors; Europe also began in 2011 Mandatory implementation of high-efficiency motors. my country released the motor energy efficiency standard (GB18613-2006) in 2006, which has been revised with reference to the IEC standard organization in recent years. The new standard (GB18613-2012) was officially implemented on September 1, 2012. According to the new national standard, most of the motor products produced in our country are not efficient. In order to accelerate the promotion of industrial energy saving and consumption reduction, promote the transformation of industrial development mode and the realization of energy-saving binding goals, it is necessary to vigorously improve the energy efficiency of motors.

At the same time, it is agreed in the academic circles that the use of frequency conversion speed regulation technology is an effective energy-saving measure. The high-efficiency motor and variable frequency motor test put forward higher requirements on the function and performance indicators of the test equipment, in order to accurately obtain the efficiency of the motor. The improvement of the design of the motor body has not attracted enough attention in the industry.

Contents of the invention

Technical problem: The present invention provides a quasi-V-shaped magnetic steel structure rotor suitable for high-performance motors with strong air-gap magnetic field and low harmonic content, which improves the efficiency of motor operation and reduces the installation space of the motor; On the basis of this, the goal of motor energy saving is effectively realized.

Technical solution: The quasi-V-shaped magnet-steel structure rotor suitable for high-performance motors of the present invention includes an active core, a quasi-V-shaped magnetic steel and an auxiliary rotor core arranged outside the active core, and the active core is hollow. structure, a plurality of teeth are arranged on the outside, and a quasi-V-shaped magnetic steel structure composed of a quasi-V-shaped magnetic steel and an auxiliary rotor core is arranged between two adjacent teeth. There are cooling channels between the outer surfaces.

Further, in the rotor of the present invention, the quasi-V-shaped magnetic steel structure includes an auxiliary mover core and two quasi-V-shaped magnetic steels located on both sides of the auxiliary mover core, and the two quasi-V-shaped magnetic steels constitute One magnetic pole, the angle θ2 between the shoulders of two quasi-V-shaped magnetic steels of a quasi-V-shaped magnetic steel structure and the center point of the core axis of the active rotor satisfies:

where p is the number of poles of the motor.

Further, in the rotor of the present invention, in a quasi-V-shaped magnetic steel structure, the included angle θ1 between the two quasi-V-shaped magnetic steels and the contact surface of the auxiliary rotor core satisfies:

Further, in the rotor of the present invention, in a quasi-V-shaped magnetic steel structure, the angle θ3 between the two vertices on the outer edge of the auxiliary mover core and the center of the arc of the auxiliary mover core satisfies:

θ2<θ3<θ1.

Further, in the rotor of the present invention, the included angle θ2 takes the value when the magnetic field strength of the air gap is the maximum value.

Furthermore, in the rotor of the present invention, the teeth of the active rotor core are made of magnetically permeable materials.

Further, in the rotor of the present invention, further, in the rotor of the present invention, the height D1 of the cooling channel and the width D2 of the quasi-V-shaped magnetic steel satisfy:

D1>D2.

The rotor of the present invention is mainly composed of rectangular magnetic steel, an active element core, an auxiliary element core, and cooling passages. Among them, two rectangular magnetic steels are composed of two rectangular magnetic steels that are installed at a predetermined angle θ2, and the tail of one magnetic pole is at an angle of θ1. Four identical rectangular magnetic steels form N and S opposite poles and are installed in a quasi-V shape; the active core is not only It is the magnetic flux channel, and it is the support of the rotor; the auxiliary mover core is cut by installing a certain radian θ3 and radius R1; the cooling channel is located under the auxiliary mover core and quasi-V-shaped magnetic steel and above the main drive core. And its width is greater than the thickness of the permanent magnet, which can effectively increase the magnetic resistance to avoid the magnetic short circuit of the quasi-V-shaped magnet, and effectively avoid the phenomenon of magnetic flux leakage. Compared with the rotor of the existing permanent magnet motor, the present invention has large air gap flux density, small cogging torque and low harmonics; high salient pole ratio, which is beneficial to field weakening control; effectively avoids magnetic circuit short circuit, leakage Fewer magnets; provides cooling channels for enhanced temperature control.

In the quasi-V-shaped rectangular magnetic steel, one magnetic pole is divided into two equal parts, and the two equal parts are installed in a quasi-V shape. In addition, the angle of the magnetic steel is θ1, and the size of this angle depends on the pole arc coefficient and the designed air gap magnetic density target value.

The quasi-V-shaped magnetic steel is close to the starting point of the air gap and the center point of the shaft forms θ2, and its radian value is smaller than the mechanical angle corresponding to the magnetic pole. In addition, this angle is related to the size of the stator and the cogging torque of the motor. Harmonics etc.

The teeth of the main rotor core are made of magnetically conductive material, and the rest can be made of nonmagnetically conductive and high-hardness materials, which mainly serve as supports.

The cooling channel is not only a cooling channel, but also its width is greater than or equal to that of the quasi-V-shaped permanent magnet block, and the magnetic isolation effect is obvious.

Beneficial effect: compared with the prior art, the present invention has the following advantages:

The quasi-V-shaped magnetic steel structure rotor of the invention has the advantages of high air gap flux density, small positioning force, low harmonic content, and the like. In the present invention, the characteristics of the quasi-V-shaped embedded permanent magnet are fully utilized, and the actual length of the magnet is calculated according to the actual requirements for the air gap magnetic density, the size of the motor, and the ratio of the teeth and grooves. Second, the quasi-V-shaped magnetic steel structure rotor of a high-performance motor analyzes the mechanism and path of magnetic flux leakage, and cuts off the path that is easily short-circuited in the magnetic circuit, so the phenomenon of magnetic flux leakage is effectively reduced. Finally, for the temperature rise problem of the high-efficiency motor, the optimization is carried out and the cooling channel is designed.

Description of drawings

Fig. 1 is a structural schematic diagram of the rotor of the present invention.

Fig. 2 is a block diagram of the rotor structure of the present invention.

Fig. 3 is a structural diagram of the rotor of the present invention.

detailed description

The present invention will be further described below in conjunction with embodiment and accompanying drawing.

A quasi-V-shaped magnetic steel structure rotor suitable for high-performance motors mainly includes a quasi-V-shaped magnetic steel 1, an auxiliary rotor core 2, an active rotor core 3 and a cooling channel 4. As shown in Figure 1.

In the present invention, the quasi-V-shaped magnetic steel is a magnetic pole installation type. Specifically, a magnetic pole is equally divided into a quasi-V shape and embedded in the rotor core, including an auxiliary mover core 2 and a Two quasi-V-shaped magnets 1 on both sides of the mover core 2, the two quasi-V-shaped magnets 1 constitute a magnetic pole, and the shoulders of the two quasi-V-shaped magnets 1 of a quasi-V-shaped magnet structure The included angle θ2 between the line connecting the 3-axis center point of the active rotor core satisfies:

where p is the number of poles of the motor.

The quasi-V-shaped magnets are installed at an angle of θ1 after being equally divided. In a quasi-V-shaped magnet structure, the angle θ1 between the contact surfaces of the two quasi-V-shaped magnets 1 and the auxiliary mover core 2 satisfies:

The auxiliary rotor core is cut according to a certain arc θ2, and the angle θ2 is related to the dimensions of the stator, cogging torque and harmonics of the motor.

The teeth of the main rotor core are made of magnetically conductive material, and the rest can be made of nonmagnetically conductive and high-hardness materials, which mainly serve as supports.

The cooling channel is not only a cooling channel, but also its width is greater than or equal to that of the quasi-V-shaped permanent magnet block, and the magnetic isolation effect is obvious.

The height D1 of the cooling channel 4 and the width D2 of the quasi-V-shaped magnetic steel 1 satisfy:

D1>D2

The above-mentioned θ1, θ2, and θ3 etc. and D1, D2 etc. are marked in detail in FIG. 2 . The three-dimensional figure of the quasi-V-shaped magnetic steel structure rotor of the present invention is shown in Figure 3 (taking 8 poles as an example).

The foregoing embodiments are only preferred implementations of the present invention. It should be pointed out that those skilled in the art can make several improvements and equivalent replacements without departing from the principle of the present invention. Technical solutions requiring improvement and equivalent replacement all fall within the protection scope of the present invention.

Claims (7)

1. A quasi-V-shaped magnetic steel structure rotor suitable for high-performance motors is characterized in that the rotor comprises a main rotor core (3), a quasi-V-shaped magnetic steel ( 1) and the auxiliary mover core (2), the main mover iron core (3) is a hollow structure, with a plurality of teeth on the outside, and a quasi-V-shaped magnetic steel (1) and an auxiliary mover are arranged between two adjacent teeth. A quasi-V-shaped magnetic steel structure composed of an iron core (2), and a cooling passage (4) is provided between the quasi-V-shaped magnetic steel structure and the outer surface of the active rotor iron core (3). 2. The quasi-V-shaped magnetic-steel structure rotor suitable for high-performance motors according to claim 1, characterized in that, the quasi-V-shaped magnetic-steel structure includes an auxiliary rotor iron core (2) and a Two quasi-V-shaped magnetic steels (1) on both sides of the sub-core (2), the two quasi-V-shaped magnetic steels (1) constitute a magnetic pole, and two quasi-V-shaped magnetic steels of a quasi-V-shaped magnetic steel structure The angle θ2 between the shoulder of the steel (1) and the center point of the axis of the active element core (3) satisfies: where p is the number of poles of the motor. 3. The quasi-V-shaped magnetic steel structure rotor suitable for high-performance motors according to claim 2, characterized in that, in said one quasi-V-shaped magnetic steel structure, two quasi-V-shaped magnetic steels (1) and auxiliary The included angle θ1 of the contact surface of the mover core (2) satisfies: 4. The quasi-V-shaped magnetic steel structure rotor suitable for high-performance motors according to claim 3, characterized in that, in the quasi-V-shaped magnetic steel structure, the two vertices on the outer edge of the auxiliary mover core (2) The included angle θ3 of the line connecting the center of the outer edge arc of the auxiliary mover core (2) satisfies the following constraints: θ2<θ3<θ1. 5 . The quasi-V-shaped magnetic-steel structure rotor suitable for high-performance motors according to claim 4 , wherein the included angle θ2 takes the value when the air-gap magnetic field strength is at its maximum value. 6. The quasi-V-shaped magnetic steel structure rotor suitable for high-performance motors according to claim 1, 2, 3, 4 or 5, characterized in that the teeth of the active rotor core (3) are made of magnetically permeable materials . 7. The quasi-V-shaped magnetic steel structure rotor suitable for high-performance motors according to claim 1, 2, 3, 4 or 5, characterized in that the height D1 of the cooling channel (4) is the same as that of the quasi-V-shaped magnetic steel structure. The width D2 of steel (1) satisfies: D1>D2.