CN102570926B - Five-degree-of-freedom suspended electric power generation system - Google Patents

Abstract

The invention relates to a five-degree-of-freedom suspended electric-generating system. It includes: a casing, a rotating shaft, a three-degree-of-freedom bearingless alternating pole permanent magnet motor with axial active suspension at the left end, a three-degree-of-freedom bearingless alternating pole permanent magnet motor with axial active suspension at the right end, and two auxiliary bearings. Two three-degree-of-freedom bearingless motors realize the five-degree-of-freedom suspension of the system, and have redundant functions in the axial direction. The three-degree-of-freedom bearingless alternating pole permanent magnet motor with axial active suspension at the left end is used as a generator to output electric energy, and the three-degree-of-freedom bearingless alternating pole permanent magnet motor with axial active suspension at the right end is used as a motor to output torque. This five-degree-of-freedom suspension electric-power generation system integrates the functions of electric motor, power generation and suspension, and has a wide range of application values in many special electric drive fields such as aerospace, life sciences, chemical industry, and semiconductor industry.

Description

Five-degree-of-freedom Suspension Electric-Generation System

technical field

The invention relates to a five-degree-of-freedom suspension motor-generation system, which is a high-speed motor system integrating motor, power generation and suspension functions, and belongs to the technical field of electric drive control equipment.

Background technique

With the rapid development of modern industry, high-speed motors and ultra-high-speed motors have been more and more widely used, such as high-speed high-precision machine tools, turbomolecular pumps, high-speed centrifuges, compressors, flywheel energy storage, and aerospace fields. In order to achieve high-speed and ultra-high-speed reliable operation of the motor, the problem of supporting the rotor at high speed must be solved. When the rotor rotates at high speed, the traditional mechanical bearings experience increased frictional resistance and increased wear, causing the motor to heat up, which not only reduces the working efficiency of the motor, shortens the service life of the motor and bearings, but also increases the burden on the maintenance of the motor and bearings .

Bearingless motor technology integrates the motor torque output and rotor electromagnetic suspension support function, which solves the wear problem of traditional mechanical bearings in high-speed and ultra-high-speed occasions. It not only has no contact, no lubrication, no wear, no mechanical noise, It has excellent characteristics such as high speed, high precision, and long life, and has the advantages of small size, high utilization of axial space, and low power consumption. It is a major breakthrough in the field of high-speed motor research.

To realize the stable levitation of the motor, it is necessary to control its five degrees of freedom in space. The traditional five-degree-of-freedom magnetic levitation system usually has three structures: 1. It is composed of two radial magnetic bearings, an axial magnetic bearing and a motor; 2. It is composed of an axial magnetic bearing and two two-degree-of-freedom bearingless motors 3. It is composed of a three-degree-of-freedom axial-radial hybrid magnetic bearing and a two-degree-of-freedom bearingless motor. Among them, the radial magnetic bearing and the axial magnetic bearing of the first structure both occupy a certain axial space, so that the effective axial length of the torque generated on the rotor is reduced, and the stiffness is reduced. In addition, the control system is also quite complicated; the second The first structure has multiple redundancy and fault tolerance functions, but the axial length is still relatively long; the third structure combines the axial and radial magnetic bearings into one, which effectively shortens the axial length, but the axial and radial hybrid magnetic bearings only have Support function, the system does not have redundancy and fault tolerance. Therefore, it is necessary to seek a new bearingless motor system with a more compact structure and more comprehensive functions.

In aerospace, life science, chemical industry, semiconductor and many other special occasions where bearingless motors are used, especially in sealed vacuum or ultra-clean areas, it may be difficult to supply power to control circuits or sensors in sealed systems. If battery power is used, battery replacement may be troublesome; if external power input is used, the requirements for sealing will be increased. In addition, in some special occasions, it may be inconvenient to install mechanical sensors such as optical code discs to measure the speed of the motor, which brings difficulties to the monitoring of the system's operating conditions. In order to solve the above-mentioned problems encountered in the application of bearingless technology and expand the application field of bearingless technology, it is necessary to seek a new type of structure or device.

Contents of the invention

The purpose of the present invention is to provide a five-degree-of-freedom suspension motor-power generation system, which integrates the functions of motorization, power generation and suspension, not only can realize the five-degree-of-freedom suspension of the motor system, but also has torque output and power output at the same time It can be applied to various special high-speed occasions.

To achieve the above object, the present invention adopts the following technical solutions:

A five-degree-of-freedom suspension electric-power generation system, including a casing and a rotating shaft, is characterized in that it has a three-degree-of-freedom bearingless alternating pole permanent magnet motor with axial active suspension at the left end and an active axial suspension at the right end The three-degree-of-freedom bearingless alternating pole permanent magnet motor is installed at the left and right ends of the casing and is set on the rotating shaft. Two auxiliary bearings are respectively installed on both sides of the motor rotating shaft to support the rotating shaft.

The structural features of the three-degree-of-freedom bearingless alternating pole permanent magnet motor with axial active suspension at the left end and the three-degree-of-freedom bearingless alternating pole permanent magnet motor with axial active suspension at the right end are: a radial stator core is respectively embedded and wound A set of three-phase four-pole torque control winding is used to control the torque output of the motor, and a set of three-phase one-pole radial suspension control winding is used to control the radial suspension force on the rotor core. Two axial stator cores are respectively installed at the left and right ends of the radial stator core, and a set of axial suspension control windings are respectively embedded and wound on the two axial stator cores. The two sets of axial suspension control windings are connected in series for Control the axial suspension force on the rotor core. The rotor permanent magnets are installed on the outer circumference of the rotor core in the radial direction. The rotor permanent magnets are arranged with the same polarity in the radial direction. The rotor cores between the rotor permanent magnets are alternately magnetized into the same polarity. The rotor core of the rotor shaft is placed in the middle of the radial stator core.

In order to prevent the system from overheating and affect the reliable operation of the system, it also has a cooling system, including a water outlet, a water inlet and a cooling water tank. on the casing.

In order to effectively control the system, it also includes a sensor detection system, and the displacement sensors used are all eddy current displacement sensors. It specifically includes the radial displacement sensor of the generator at the left end, the radial displacement sensor and the axial displacement sensor of the motor at the right end.

The working principle of the present invention is: two sets of three-degree-of-freedom bearingless alternating pole permanent magnet motors for axial active suspension are used to realize the five-degree-of-freedom suspension of the system, and the suspension of one degree of freedom in the axial direction can be realized by one of the motors. The axial suspension function of the other set of motors is used as a backup, that is, there is a redundancy in the axial direction. Even if the axial suspension winding of one of the motors fails, the axial suspension of the system can still be achieved, thereby improving the safety of the system. sex and reliability. The three-degree-of-freedom bearingless alternating pole permanent magnet motor with axial active suspension at the right end is used as a motor to output the required torque. The three-degree-of-freedom bearingless alternating pole permanent magnet motor with axial active suspension at the left end is used as a generator, which converts the externally input electric energy into electric energy output with adjustable voltage and current values, and supplies power to other electrical equipment. It can also be used as a tachogenerator for detection The speed of the system.

Compared with the prior art, the present invention has the following obvious outstanding substantive features and significant advantages:

1. It has the functions of motor, generator and suspension at the same time. While realizing the suspension of five degrees of freedom of the rotating shaft, it can output torque, output the required electric energy, and measure speed, which broadens the application field of bearingless motors.

2. The axial suspension has a redundancy. Even if the axial suspension winding of one of the motors fails, the system can still achieve axial suspension, which improves the safety and reliability of the system.

3. The axial space utilization rate is high and the structure is simple, especially suitable for occasions requiring small size, light weight, high reliability and long life.

4. Facilitate machining assembly and modular production, reduce machining process requirements, and low cost.

In general, the five-degree-of-freedom suspension motor-power generation system constructed by the present invention integrates the functions of motorization, power generation and suspension, and realizes the five-degree-of-freedom suspension of the system. Compared with the traditional five-degree-of-freedom suspension system, the shaft The axial utilization rate is higher, and the fault tolerance or redundancy function of the axial suspension function can be realized. In addition, in a sealed vacuum or ultra-clean field, the power generation function in the motor system can be used to supply power to the control circuit or sensor in the sealed system; and in places where it is inconvenient to install mechanical sensors such as optical code discs, the power generation function can be used to Part of it is used as a tachometer generator to detect the speed of the motor. Therefore, by virtue of its compact structure and powerful functions, the present invention has wide application value in many special electric transmission fields such as aerospace, life science, chemical industry, semiconductor industry and so on.

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

Detailed ways

A preferred embodiment of the present invention is described as follows in conjunction with accompanying drawing:

Referring to Fig. 1, the five-degree-of-freedom suspension electric-power generation system consists of a casing 20, a rotating shaft 21, a three-degree-of-freedom bearingless alternating pole permanent magnet motor 22 at the left end axially actively suspended, and a right-side axially actively suspended three-degree-of-freedom motor A bearingless alternating pole permanent magnet motor 18 and two auxiliary bearings 16, 24 are formed. A three-degree-of-freedom bearingless alternating-pole permanent magnet motor with axial active suspension is installed at the left end of the system and used as a generator, which can convert externally input electric energy into electric energy output with adjustable voltage and current values, giving

The power supply for other electrical equipment can also be used as a tachometer generator to detect the speed of the system; another three-degree-of-freedom bearingless alternating pole permanent magnet motor with axial active suspension is installed at the right end of the system and used as a motor to output torque; two auxiliary bearings 16 and 24 are installed on both sides of the rotating shaft 21 respectively. The three-degree-of-freedom bearingless alternating pole permanent magnet motor 22 with axial active suspension on the left end and the three-degree-of-freedom bearingless alternating pole permanent magnet motor 18 with axial active suspension at the right end are characterized in that: the radial stator cores 4 and 11 are respectively embedded A set of three-phase four-pole pair torque control windings 2 and 9 are used to control the torque output of the motor and a set of three-phase one-pole radial suspension control windings 1 and 8 are used to control the radial suspension of the rotor core force. Two axial stator cores 7, 14 are respectively installed at the left and right ends of the radial stator cores 4, 11, and a set of axial suspension control windings 3, 10 are respectively embedded and wound on the two axial stator cores 7, 14. The sets of axial suspension control windings are connected in series to control the axial suspension force on the rotor cores 6 and 12 . The rotor permanent magnets 5 and 13 are installed on the outer circumference of the rotor cores 6 and 12 in the radial direction, the rotor permanent magnets are arranged with the same polarity in the radial direction, and the rotor cores between the rotor permanent magnets are alternately magnetized into the same other In one polarity, the rotor cores 6 and 12 equipped with the rotor shaft 21 are placed in the middle of the stator cores 4 and 11 in the radial direction.

The cooling system includes a water outlet hole 17 , a water inlet hole 23 and a cooling water tank 19 , the water outlet hole 17 and the water inlet hole 23 are respectively located on both sides of the casing 20 in the axial direction, and the cooling water groove 19 is arranged on the casing 20 .

The sensor detection system includes a generator radial displacement sensor 25 at the left end, a motor radial displacement sensor 15 and an axial displacement sensor 26 at the right end. The right motor radial displacement sensor 15 is located on the right side of the right auxiliary bearing 16, the left generator radial displacement sensor 25 is located on the left side of the left auxiliary bearing 24, and the axial displacement sensor 26 is located at the leftmost end of the rotating shaft 21 axially. The displacement sensors used are all eddy current displacement sensors.

The three-degree-of-freedom bearingless alternating pole permanent magnet motor 22 with axial active levitation at the left end changes the symmetrical distribution of the rotating magnetic field generated by the torque control winding 2 by controlling the levitation control current in the radial levitation control winding 1, so that on the rotor Generate a radial levitation force with controllable size and direction to realize the two-degree-of-freedom levitation of the motor in the radial direction; while the axial levitation control winding 3 changes the magnetic field generated by the rotor permanent magnet 5 at the left and right air gaps in the axial direction, thereby generating an axial The levitation force in the direction realizes the levitation of one degree of freedom in the axial direction; the bearingless alternating pole permanent magnet motor 18 with three degrees of freedom in the axial active levitation at the right end is also the same. Therefore, the suspension of three degrees of freedom at the left end and the suspension of three degrees of freedom at the right end can realize the suspension of five degrees of freedom, and there is a redundancy of one degree of freedom in the axial direction. In the actual working process, the three-degree-of-freedom bearingless alternating pole permanent magnet motor 22 that makes the left end axially actively suspended works in the power generation state, and the torque control winding 2 outputs the required voltage or current value, or is used to detect the system speed , the three-degree-of-freedom bearingless alternating-pole permanent magnet motor 18 with active axial suspension on the right end works in the electric state, and the required torque is output by the rotating shaft 21 .

Claims (1)

1. the electric power generation system of a five-degree magnetic suspension, comprise a casing (20) and a rotating shaft (21), it is characterized in that: have the three-freedom consequent pole permanent magnet motor without bearing (18) of the three-freedom consequent pole permanent magnet motor without bearing of a left end axial direction initiative suspending (22) and a right-hand member axial direction initiative suspending be installed on described casing (20) two ends, inner left and right respectively and be sleeved in described rotating shaft (21) having two auxiliary bearings (16,24) to be installed on the both sides of rotating shaft (21) respectively and supporting shaft (21), the three-freedom consequent pole permanent magnet motor without bearing (22) of described left end axial direction initiative suspending and the three-freedom consequent pole permanent magnet motor without bearing (18) of right-hand member axial direction initiative suspending comprise two pieces of axial stator iron cores (7 respectively, 14), these two pieces of axial stator iron cores (7, 14) radial stator iron core (4 is installed on respectively, 11) two ends, left and right, at two pieces of axial stator iron cores (7, 14) upper embedding around a set of axial suspension controlled winding (3 respectively, 10), the axial suspend control winding (3 of this two cover, 10) be connected in series, described radial stator iron core (4, 11) upper respectively embedding around a set of three-phase four to pole direct torque winding (2, 9) and a set of three-phase a pair pole radial suspension controlled winding (1, 8), described two magnetoes (22,18) respectively have a rotor permanent magnet (5,13) to be arranged on a rotor core (6,12) excircle with radial direction respectively, described rotor permanent magnet (5,13) is radially same polarity arrangement, rotor core (6,12) between this rotor permanent magnet (5,13) is become another identical polarity by alternating magnetization, and the rotor core (6,12) that rotor shaft (21) are housed is placed in the position, middle of radial stator iron core (4,11), this electric power generation system has a cooling system: comprise an apopore (17), a blasthole (23) and a bosh (19), described apopore (17) and blasthole (23) lay respectively at the axial both sides of casing (20), and described bosh (19) is located on casing (20), this electric power generation system also has a sensor detecting system: comprise a left end generator radial displacement transducer (25), a right-hand member motor radial displacement transducer (15) and a shaft position sensor (26), described left end generator radial displacement transducer (25) is positioned at the left side of left end auxiliary bearing (24), right-hand member motor radial displacement transducer (15) is positioned at the right side of right-hand member auxiliary bearing (16), shaft position sensor (26) is positioned at rotating shaft (21) axial high order end, the displacement transducer (25 adopted, 15, 26) eddy current displacement sensor is.