阅读说明：本技术 一种高效扩速的内置式永磁同步电机结构 (Built-in permanent magnet synchronous motor structure with efficient speed expansion ) 是由 戈宝军 匡恒 王立坤 于 2019-11-01 设计创作，主要内容包括：本发明提供一种高效扩速的内置式永磁同步电机结构,属于电机结构技术领域,电机采用内转子结构,所述转子每极磁路采用V型结构,每极磁路的顶角和底端均设置有隔磁铁桥,每侧的磁极被分成两段,然后在两段磁极中间增加导磁铁桥,在转子外侧、磁极下方和相邻定子侧开槽,其技术要点在于：两端的隔磁铁桥可以防止漏磁过大而导致永磁体材料的利用率降低,保证了电机功率能够在一定范围内稳定的运行,增加的导磁铁桥,可以起到弱磁扩速的效果,在转子外侧开槽,放入转子导条,能够实现电机的快速起动；在每极永磁体下方和相邻的定子槽之间开槽通入水冷管道,能抑制电机由于升温导致的效率降低和永磁体由于温度过高导致不可逆的退磁。(The invention provides a built-in permanent magnet synchronous motor structure with high-efficiency speed expansion, which belongs to the technical field of motor structures, wherein a motor adopts an inner rotor structure, each pole of a rotor adopts a V-shaped structure, a top angle and a bottom end of each pole of magnetic circuit are respectively provided with a magnet isolating bridge, a magnetic pole at each side is divided into two sections, then a magnetic conducting iron bridge is added between the two sections of magnetic poles, and grooves are formed in the outer side of the rotor, the lower side of the magnetic pole and the side of an adjacent stator, and the technical key points are as follows: the magnetic isolation iron bridges at the two ends can prevent the reduction of the utilization rate of permanent magnet materials caused by overlarge magnetic leakage, ensure the stable operation of the power of the motor in a certain range, have the effect of weakening the magnetism and expanding the speed, open a groove at the outer side of the rotor, put in a rotor conducting bar and realize the quick start of the motor; a water cooling pipeline is arranged between the lower part of each pole of permanent magnet and the adjacent stator slot in a slotted mode, so that the efficiency reduction of the motor caused by temperature rise and the irreversible demagnetization of the permanent magnet caused by overhigh temperature can be inhibited.)

1. The utility model provides a built-in PMSM structure of high-efficient speed extension which characterized in that: the motor adopts an inner rotor structure, the permanent magnets are arranged in the rotor, each permanent magnet is divided into two sections and an auxiliary groove is added in order to ensure stable operation and wider speed expansion range when the motor can regulate the speed, the auxiliary groove is added on the outer side of the rotor in order to solve the problem of difficult starting of the motor to realize asynchronous starting of the motor, and the auxiliary groove is added between the lower part of each pole of permanent magnet and the stator groove in order to solve the problem of overhigh temperature in the operation process of the motor.

2. The high-efficiency speed-expanding interior permanent magnet synchronous motor structure according to claim 1, characterized in that: and magnetic isolation iron bridges are added at two top corners and bottom ends of each pole of permanent magnet.

3. The high-efficiency speed-expanding interior permanent magnet synchronous motor structure according to claim 1, characterized in that: the permanent magnets on each side are divided into two sections, and then a magnetic iron bridge is added between the two sections of permanent magnets.

4. The high-efficiency speed-expanding interior permanent magnet synchronous motor structure according to claim 1, characterized in that: rotor guide bars are placed in auxiliary grooves on the outer side of the rotor.

5. The high-efficiency speed-expanding interior permanent magnet synchronous motor structure according to claim 1, characterized in that: and auxiliary grooves are added below the permanent magnets of each pole and between adjacent stator grooves, and water pipes are placed in the auxiliary grooves.

Technical Field

The invention relates to the technical field of motors, in particular to a built-in permanent magnet synchronous motor structure capable of efficiently expanding speed.

Background

The built-in permanent magnet synchronous motor is a controllable alternating current synchronous motor which appears along with the development of the permanent magnet motor, a stator of the built-in permanent magnet synchronous motor adopts a tooth space structure, and a rotor of the built-in permanent magnet synchronous motor adopts a built-in permanent magnet structure. The built-in permanent magnet synchronous motor has the advantages of simple structure, small volume, large torque density, high efficiency and the like, is widely applied to various engineering fields, and is an energy-saving environment-friendly motor with good development prospect. However, the speed regulation range of the interior permanent magnet synchronous motor is limited, which causes that the motor is difficult to stably run at the rated rotation speed, the interior permanent magnet synchronous motor is complicated to start, which causes that the motor needs a long time to run at the rated state when being started every time, the application of the motor in a system needing frequent starting is limited, in addition, the poor heat dissipation of the motor causes that the efficiency of the motor is reduced and the demagnetization of the permanent magnet is also a common problem, and the defects limit the further development of the interior permanent magnet motor.

Disclosure of Invention

The invention aims to provide a built-in permanent magnet synchronous motor structure with high-efficiency speed expansion, which aims to solve the problems of unstable running power, small speed regulation range, difficult starting of a motor, efficiency reduction caused by overhigh temperature during the running of the motor, irreversible demagnetization of a permanent magnet and the like of the existing built-in permanent magnet synchronous motor during the speed regulation.

In order to achieve the aim, the invention adopts the technical scheme that: the invention provides a built-in permanent magnet synchronous motor structure with high-efficiency speed expansion, which is characterized in that the internal structures of a rotor and a stator of a motor are improved; each pole magnetic circuit of the rotor adopts a V-shaped structure, a top angle and a bottom end in each pole magnetic circuit are respectively provided with a magnetic isolation iron bridge, a magnetic pole at each side is divided into two sections, then a magnetic conduction iron bridge is added between the two sections of magnetic poles, a groove is formed in the outer side of the rotor, a rotor conducting bar is placed into the groove, a groove is formed below each pole permanent magnet, and a water pipe is placed into the groove; the stator is provided with slots between adjacent stator slots, and water pipes are introduced into the slots.

By adopting the technical scheme, the built-in permanent magnet synchronous motor obtains good operation characteristics, the top angle and the bottom end of the V-shaped permanent magnet are both provided with the magnet isolating bridges, so that the lower utilization rate of permanent magnet materials caused by overlarge magnetic flux leakage can be prevented, and the stable operation of the motor power in a certain range can be ensured; each side permanent magnet of the V-shaped magnetic circuit is divided into two sections, then a magnetic conduction iron bridge is added between the two sections of permanent magnets with the same polarity, and the added magnetic conduction iron bridge can enable a part of magnetic flux to generate magnetic leakage through the iron bridge, so that the magnetic flux in the main magnetic circuit is reduced, the straight-axis magnetic resistance of the rotor is reduced, and the weak magnetic speed expansion effect is started; slotting the outer side of the rotor, putting a rotor conducting bar in the slot, and introducing symmetrical three-phase current into the conducting bar, thereby realizing asynchronous starting of the motor and enabling the motor to be quickly started to enter a stable state; a water cooling pipeline is arranged between the lower part of the magnetic pole and the adjacent stator slot in a slotting mode, and when water flows through the pipeline, the specific heat capacity of the water is small, so that the efficiency reduction of the motor caused by temperature rise and the irreversible demagnetization of the permanent magnet caused by overhigh temperature can be effectively restrained, and the motor can effectively run at high speed.

Drawings

Fig. 1 is a schematic structural diagram of an efficient speed-expanding interior permanent magnet synchronous motor of the invention.

In the figure: 1. a magnetic isolation iron bridge 2, a water cooling pipeline 3, a permanent magnet 4, a rotor conducting bar 5 and a magnetic conduction iron bridge.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

Referring to the description, the attached figure 1 is a structural schematic diagram of a built-in permanent magnet synchronous motor with high efficiency and speed expansion; the motor is characterized in that the internal structures of a rotor and a stator of the motor are improved; each pole magnetic circuit of the rotor adopts a V-shaped structure, a top angle and a bottom end in each pole magnetic circuit are respectively provided with a magnetic isolation iron bridge, a magnetic pole at each side is divided into two sections, then a magnetic conduction iron bridge is added between the two sections of magnetic poles, a groove is formed in the outer side of the rotor, a rotor conducting bar is placed into the groove, a groove is formed below each pole permanent magnet, and a water pipe is placed into the groove; the stator is provided with slots between adjacent stator slots, and water pipes are introduced into the slots.

By adopting the technical scheme, the built-in permanent magnet synchronous motor obtains good operation characteristics, the top angle and the bottom end of the V-shaped permanent magnet are both provided with the magnet isolating bridges, so that the lower utilization rate of permanent magnet materials caused by overlarge magnetic flux leakage can be prevented, and the stable operation of the motor power in a certain range can be ensured; each side permanent magnet of the V-shaped magnetic circuit is divided into two sections, then a magnetic conduction iron bridge is added between the two sections of permanent magnets with the same polarity, and the added magnetic conduction iron bridge can enable a part of magnetic flux to generate magnetic leakage through the iron bridge, so that the magnetic flux in the main magnetic circuit is reduced, the straight-axis magnetic resistance of the rotor is reduced, and the weak magnetic speed expansion effect is started; slotting the outer side of the rotor, putting a rotor conducting bar in the slot, and introducing symmetrical three-phase current into the conducting bar, thereby realizing asynchronous starting of the motor and enabling the motor to be quickly started to enter a stable state; a water cooling pipeline is arranged between the lower part of the magnetic pole and the adjacent stator slot in a slotting mode, and when water flows through the pipeline, the specific heat capacity of the water is small, so that the efficiency reduction of the motor caused by temperature rise and the irreversible demagnetization of the permanent magnet caused by overhigh temperature can be effectively restrained, and the motor can effectively run at high speed.

The above description is a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above description, and several simple deductions or substitutions may be made without departing from the spirit of the present invention.