169results about How to "Increase the critical speed" patented technology

Disclosed a high speed magnetic levitation flywheel stability control system, comprises a displacement sensor, a displacement signal interface circuit, a rotary speed detect circuit, a magnetic bearing controller, and a magnetic bearing power amplifying drive circuit. Wherein, the magnetic bearing controller comprises a axial magnetic bearing controller and a radial magnetic bearing controller, while the radial one is formed by decentralized PID control module and a cross feedback control module whose outputs are connected by the feedback method in cross and parallel. Said invention utilizes the cross feedback control formed by forward whirling motion filter and backward whirling motion filter based on the decentralized PID control; it reaches the phase lead compensation to the forward and backward whirling motion by using the difference of their frequency and whirling motion directions, their variation rule of rotary speed, and the signal of rotary speed of flywheel. So the breakdown speed of flywheel is improved while the stable operation of magnetic levitation flywheel in whole rising and falling process is confirmed too.

The invention relates to an axial initiative-suspension three-dimensional bearing-free alternative-pole permanent-magnetic machine, which belongs to a bearing-free magnetic-suspension motor. The machine comprises two axial stator cores (1) that are provided with axial suspension controlling windings (8) that are serially connected with each other, a radial stator core (2) that is provided with a set of four-pair-pole torque controlling windings (7) and a set of one-pair-pole radial suspension controlling windings (6), a rotor core (4) that is provided with four homo-polar magnetizing permanent-magnets (3) and a rotor rotating shaft (5) that is enclosed with the rotor core (4). The motor has simple and compact structure, is free from additional axial magnetic bearing, integrates the motor rotation and axial and radial simultaneous-suspension functions of the rotor, has high integration, enlarges the suspension freedom of the bearing-free motor, simplifies the system structure, reduces the volume, the weight and the cost of the system, and has broad application prospect and important significance in different high-speed magnetic-suspension motor systems.

The invention discloses a flywheel energy storing device. The device includes a vacuum container arranged on the outer layer. A rotary shaft is arranged in the center of the vacuum container. A radial-axial permanent magnetic bearing is nested in the upper end of the rotary shaft. The lower end of the rotary shaft is sleeved with a flywheel, a single-winding outer rotor magnetic suspension switch reluctance motor, and a permanent magnetic bias radial-axial magnetic bearing successively from top down. The rotary shaft penetrates through the center of the flywheel and is connected with the flywheel. The flywheel is nested in an outer rotor of the single-winding outer rotor magnetic suspension switch reluctance motor. According to the invention, by combining that the single-winding outer rotor magnetic suspension switch reluctance motor can drive the flywheel directly and has a high-speed suspension function with that the radial-axial magnetic bearing and a hybrid magnetic shaft have characteristics of controllable suspension in forced uninstallation, five degree of freedom and high-reliability suspension of the flywheel are realized. Besides, operation speed of the flywheel is increased and system power consumption and size are reduced.

The invention belongs to the technical field of a motor, and relates to a single-winding non-bearing magnetic flux switching permanent magnetic motor. The single-winding non-bearing magnetic flux switching permanent magnetic motor comprises a stator iron core, a rotator iron core, permanent magnets embedded in the middle of stator teeth, and concentrated windings. A stator and a rotor are both of double-salient pole structures. The single-winding non-bearing magnetic flux switching permanent magnetic motor is characterized in that the stator iron core is composed of six U-shaped laminations; a permanent magnet capable of tangential alternative magnetizing is embedded between every two laminations so that a stator tooth which is axisymmetric is formed; the stator teeth are provided with the concentrated windings, the end portions of the windings are quite small, and the windings, which are opposite to each other in terms of space, on two stator teeth form a phase so that a three-phase winding is formed; and the excitation of winding currents is of a radial excitation mode, each winding is independently controlled, the winding currents can perform bidirectional flow in positive and negative directions, the current size can be controlled according to needs, and the currents has the same phase as a back electromotive force. The single-winding non-bearing magnetic flux switching permanent magnetic motor has the advantages of high speed, large power, high efficiency, high power density, high operation stability, high reliability, and adaptability to an AC operation mode.

The invention discloses a magnetic suspension switch magnetic resistance flywheel motor and a control method. The magnetic suspension switch magnetic resistance flywheel motor comprises an inner stator, a rotor and an outer stator. The inner stator (6), the rotor (4) and the outer stator (1) are successively nested in a concentric mode, 12 torque poles (2) are arranged on the inner wall of the outer stator (1) at equal intervals, and the torque poles are wound by main windings (3); eight rotor salient poles (5) are arranged on the outer wall of the rotor (4) at equal intervals; and four suspension poles (7) are arranged on the outer wall of the inner stator (6) at equal intervals, and the suspension poles (7) are wound by suspension force windings (8). According to the invention, the problem of incapability of effectively generating suspension forces when a stator and a rotor are not aligned by use of a conventional magnetic suspension switch magnetic resistance motor is overcome, the radial force and the torque decoupling effect are good, the radial load capability is improved, the suspension force windings are individually controlled simply according to a needed radial suspension force, each main winding on the outer stator is also controlled simply according to needed electromagnetic torque, the control is easy, and a control algorithm is simpler and is more easily realized.

The invention relates to a two-stage series pressurization direct-driven centrifugal air compressor of a fuel cell engine. The two-stage series pressurization direct-driven centrifugal air compressor comprises end covers, a spindle, volutes, impellers, a rotor, a stator and a driver. The spindle is supported by a left-end radial supporting air foil bearing, a left-end radial supporting air foil bearing bush, an air foil axial thrust bearing and a right-end radial supporting air foil bearing, wherein the left-end radial supporting air foil bearing and the left-end radial supporting air foil bearing bush are arranged on the left side, and the air foil axial thrust bearing and the right-end radial supporting air foil bearing are arranged on the right side of the spindle. The left-end radial supporting air foil bearing bush is arranged on the outer side of the spindle in a surrounding manner. The left-end radial supporting air foil bearing is fixed to the outer side of the left-end radial supporting air foil bearing bush. The air foil axial thrust bearing is fixed to the outer side of the spindle in a bush form. The right-end radial supporting air foil bearing is fixed to the outer side of the air foil axial thrust bearing. Compared with the prior art, the two-stage series pressurization direct-driven centrifugal air compressor is more suitable for the air inlet pressurization scene of the fuel cell engine with the high oilless air inlet requirement, and the durability and reliability of the air compressor of the fuel cell engine can be improved.

The invention discloses a five-degree-of-freedom (five-DOF) bearing-free permanent magnet synchronous motor. Left and right conical bearing-free permanent magnet synchronous motors respectively arranged at the left and right ends of a motor shell are symmetrically connected to a mechanical rotating shaft; each conical bearing-free permanent magnet synchronous motor consists of a conical stator, atorque winding, a suspension force winding and a conical rotor; and a permanent magnet is mounted on the outer surface of the conical rotor, a jacket is fixedly sleeved outside the permanent magnet, the conical rotor is fixedly arranged on the mechanical rotating shaft, the conical stator is provided with a plurality of through slots in the axial direction, each through slot is divided into an inner layer and an outer layer in the radial direction, the suspension force winding and the torque winding are respectively placed in the inner layer and the outer layer, the pole number of the torque winding is as same as that of the permanent magnet, and the difference between the pole number of the suspension force winding and the pole number of the torque winding is 2. The five-DOF bearing-freepermanent magnet synchronous motor can simultaneously realize radial and axial five-DOF suspension of the rotor without an additional magnetic bearing, has the advantages of high integration, reducedvolume and high critical rotating speed, and is easy to realize high-power ultrahigh-speed operation.

The invention discloses a constant current biased radial-axial magnetic bearing. The magnetic bearing comprises a rotating shaft, a rotor and a stator core which are mounted coaxially, wherein the stator core is formed by connection of two identical disks, an outer ring, an inner ring, two identical small rings and three stator core magnetic poles; the outer wall of the inner ring is tightly sleeved with a peripheral magnet-isolating aluminum ring; an internal magnet-isolating aluminum sheet is embedded in the axial middle inside each stator core magnetic pole; an axial control coil connected with a power amplifier is arranged between the peripheral magnet-isolating aluminum ring and the outer ring; a radial control coil is wound on each stator core magnetic pole, and three radial control coils are connected to a three-phase AC power inverter after star connection; a constant current biased coil is arranged in each of two axial cavity formed by the disks, the inner ring and the three stator core magnetic poles; and the two constant current biased coils are connected in series and then connected with the constant current. The magnetic bearing is good in heat dissipation, low in cost, small in power consumption and large in bearing force.

The invention provides an axial split-phase internal stator permanent magnet biased magnetic suspension switched reluctance flywheel motor comprising an external rotor, a flywheel and an internal stator. The external rotor is packaged at the internal side of the flywheel in a laminating way. An internal stator iron core and an external rotor iron core are divided into m segments along the axis according to the phase number. The internal side of each segment of external rotor is equidistantly provided with 12 rotor poles along the circumference. The internal stator iron core is provided with 8 narrow tooth main magnetic poles and 4 wide tooth suspension poles. Main pole control coils and suspension control coils are respectively wound on the narrow tooth main magnetic poles and the wide tooth suspension poles. The coils on each narrow tooth main magnetic pole are interconnected in series to form a main pole winding. Every two of the control coils on each segment of wide tooth suspension pole are connected in series so as to form two sets of suspension windings in an orthogonal direction. The size of the system can be reduced and the critical speed of rotation can be enhanced; the suspension supporting loss can be reduced and the operation efficiency can be enhanced; and the stator poles are separately provided with the suspension poles, the main magnetic poles and magnetic isolating rings so that the control algorithm can be simplified and the suspension performance and the decoupling effect can be enhanced.

The invention discloses a permanent magnet biased five-degree-of-freedom integrated magnetic suspension supporting system. A stator comprises a left side radial magnetic bearing iron core, a right side radial magnetic bearing iron core, a left side annular permanent magnet, a right side annular permanent magnet, a left side axial control iron core and a right side axial control iron core; a radial control iron core is arranged between the left side annular permanent magnet and the right side annular permanent magnet; a radial control winding is wound on stator teeth; a right side magnetism dividing aluminum ring is arranged between the left side axial control iron core and the radial control iron core, and a left side magnetism dividing aluminum ring is arranged between the right side axial control iron core and the radial control iron core; a left side radial control winding is correspondingly wound on the left side radial magnetic bearing iron core in a stator groove, and a right side radial control winding is correspondingly wound on the right side radial magnetic bearing iron core in the stator groove; and the left side axial control iron core and the right side axial control iron core are each of an E-shaped structure, and axial control windings are correspondingly wound in the stator groove. The supporting system is small in axial length, high in critical rotating speed, simple in structure, easy to manufacture and assemble, and capable of generating larger axial and radial suspension force, and the axial control magnetic flux and the radial control magnetic flux do not pass through the permanent magnets.

The invention provides an online active type cutting chatter restraining system and method for an intelligent milling motorized spindle. The online active type cutting chatter restraining system for the intelligent milling motorized spindle comprises a sensing portion, a controller and a chatter restraining adjustment and control device, wherein the sensing portion, the controller and the chatter restraining adjustment and control device are sequentially connected. The sensing portion comprises a non-contact type eddy current displacement sensor and a signal collector, wherein the non-contact type eddy current displacement sensor is installed at the front end of the spindle and used for measuring the axial displacement of the spindle, and the signal collector is used for collecting displacement signals of the non-contact type eddy current displacement sensor and converting the displacement signals to acceleration signals. The controller is used for outputting voltage control signals to the chatter restraining adjustment and control device according to the acceleration signals output by the signal collector. The chatter restraining adjustment and control device comprises a power amplifier and an active type electromagnetic bearing. The active type electromagnetic bearing comprises a rotor core and a stator core, wherein the rotor core is installed at the front end of the spindle, and a copper coil is wound around the stator core. The power amplifier is used for converting the received voltage signals into current control signals. The output end of the power amplifier is connected with the copper coil. The online active type cutting chatter restraining method for the intelligent milling motorized spindle comprises the steps of identifying and restraining chatter in the machining process.

The invention discloses a low-power-consumption permanent-magnet bias five-degree-of-freedom integrated magnetic bearing which comprises a stator and a rotor iron core, wherein the stator iron core comprises an axial part and a radial part; the stator comprises a left radial magnetic bearing iron core and a right radial magnetic bearing iron core as well as a left ring-shaped permanent magnet, a right ring-shaped permanent magnet, a left axial magnetic bearing iron core and a right axial magnetic bearing iron core; and a magnetism-isolated aluminum ring is arranged between the left axial magnetic bearing iron core and the right axial magnetic bearing iron core. The invention effectively solves the defects of a current five-degree-of-freedom magnetic suspension system and provides the low-power-consumption permanent-magnet bias five-degree-of-freedom integrated magnetic bearing which is small in size, is light in mass, is short in axial length, is high in clinical rotation speed, is high in iron core utilization rate, is simple in structure, is simple to manufacture and assemble, controls magnetic flux without the permanent magnets in the axial direction and in the radial direction, and can generate greater axial suspension force and radial suspension force.

The invention discloses a circumferential sectioned helium sealing device for an oxygen turbine pump of a hydrogen oxygen engine. According to the circumferential sectioned helium sealing device, a circumferential sectioned sealing ring I and a circumferential sectioned sealing ring II are placed in a cavity formed by a cover plate and a sealing shell; sealing shaft sleeves are placed in rings of the circumferential sectioned sealing ring I and the circumferential sectioned sealing ring II; the circumferential sectioned sealing ring I and the circumferential sectioned sealing ring II are oppositely placed and pre-tensioned by virtue of pre-tensioning springs; and each of the circumferential sectioned sealing ring I and the circumferential sectioned sealing ring II is formed by connecting a plurality of fan-shaped arc sections with the same structure end to end, and constrained on an excircle surface through garter springs. According to the circumferential sectioned helium sealing device, each sealing ring is composed of the plurality of fan-shaped arc sections, a hydrodynamic groove structure is introduced, and a hydrodynamic effect of a sealing clearance fluid is adequately utilized, thus the helium sealing device reliably works under an extremely small clearance, and a low leakage amount is maintained.

The invention provides a guide vane designing method for improving stability of a multistage pump. The guide vane designing method includes the following steps: determining geometric parameters of guide vanes, acquiring a basic guide vane model from three-dimensional modeling software according to the geometric parameters, and arranging multiple groove structures at guide vane hubs of the guide vane basic model to acquire a final guide vane model; acquiring final guide vanes by means of die opening and casting according to the final guide vane model. According to the guide vane designing method, the guide vanes in a proper number are selected in the process of designing the guide vanes, and maximum 2, 3 or 4 common divisor exists between the proper number and number of impeller vanes, so that flowing inside the multistage pump can present obvious regularity, and the objective of lowering vibrating amplitude of the multistage pump is achieved; the groove structures are arranged at the guide vane hubs, so that large radial water power is generated at the guide vane hubs of the multistage pump, good supporting effect is realized, and stability of the multistage pump is improved.

Disclosed are a high-speed permanent magnet synchronous motor and an assembly method thereof. The motor comprises a motor shell, a motor stator, a spindle rotor component and a pair of bearing assemblies, the bearing assemblies are separately arranged at the front end and the rear end of the shell, the motor stator is fixed into the motor shell, the spindle rotor component is sleeved in the motor stator, two ends of the spindle rotor component are supported on the motor shell through the bearing assemblies, the spindle rotor component comprises a front rotor half shaft, a rotor permanent magnet, a rotor sleeve and a rear rotor half shaft, the rotor permanent magnet is sleeved in the rotor sleeve, one end of the rotor sleeve is fixedly connected with the front rotor half shaft, and the other end of the rotor sleeve is fixedly connected with the rear rotor half shaft. The high-speed permanent magnet synchronous motor is compact in structure, sufficient in space usage, small in radial dimension and particularly suitable for meeting the requirement on high rotation speed. The assembly method includes the steps: 1) mounting the motor stator into the motor shell; 2) assembling the spindle rotor component and magnetizing the rotor permanent magnet in the spindle rotor component after the spindle rotor component is assembled; and 3) mounting the spindle rotor component into the motor stator, and supporting the spindle rotor component on the motor shell through the bearing assemblies.