Bm4 bm3 wheel motor bm5 bearingless bm5 bm6 bearingless bmt motor with speed sensor bmv bm6b. Energies free fulltext multiphysics multiobjective. Bearingless motor, magnetic levitation, vibration suppression, efficiency 1. It is shown that the suspension system dynamics in a bearingless motor depend on the motor winding current amplitude. Calculations and subsequent modelling of various forces acting upon the rotor are shown in chapter ii.
Pdf bearingless permanent magnet synchronous motor bpmsm. Precision motion control solutions celera motion, a. Although stators traditionally enclose rotors, conical bearingless motorgenerators. Two highspeed bearingless permanent magnet pm synchronous motor prototypes with different mechanical and electrical ratings are presented from the design and performance point of. Rddseries direct drive motors feature singleturn or multiturn high resolution encoders.
Bearingless motor unit three spatial degrees of freedom of the rotor, rotation and radial position are stabilized actively by electronically controlled magnetic fields. Novel singledrive bearingless motor with wide magnetic. This paper overviews the key technologies of the bearingless induction motors, with emphasis on motor topologies, mathematical models, and. Hinkkanen, marko modeling of a bearingless synchronous. Insert the four 38 inch x 16 unc socket head cap screws through the frame and into the motor frame. Bearingless induction motors combining functions of both torque generation and noncontact magnetic suspension together have attracted more and more attention in the past decades due to their definite. Since windings of the radial direction force are wound together into the stator of motor in. In order to stabilize the rotor contactless magnetic bearings are utilized. Install one shuttle valve poppet, spring and dash pot onto piston. This allows further integration of the drive and, together with the bearingless. Pdf overview of bearingless induction motors researchgate. Preface unlike ordinary magnetic suspension, a bearingless motor 12 has an active magnetic bearing to support the rotor.
And all that with all the benefits of magnetic bearings. Provided is a bearingless motor capable of stably performing magnetic levitation and rotation even when a thrust disk is not provided and gap length is wide. Levitronix is the first company to introduce the bearingless motor technology, a breakthrough in magnetic levitation, to the market. Novel converter concept for bearingless slice motor systems. Motor feedback systems bearingless encoders encoders linear measuring technology single cable solutions. Bearingless motor the wheel motor mounting flange is located near the center of the motor which permits part or all of the motor to be located inside the wheel or roller hub. Bearingless motors lcm linz center of mechatronics. A bearingless motor has two sets of intercoupling stator windings, namely torque windings and suspension force windings.
Different motor types have been used as bearingless motors. Eaton charlynn vis 45 series bearingless motors parts and repair manual cmolotm006e march 2008 3 vis bearingless motors 45 series parts list ref. A special feature of the winding system is that it creates both bearing forces and motor torque with the same set of windings. These are simplified crosssectional views of representative configurations of machines described in the text. Vis bearingless motors 45 series disassembly screw, 12pt end cap seal, square cut oring valve plate seal, square cut geroler check balls drive seal, square cut balance plate outer balance plate inner seal, square cut spring, belleville disc backup ring oring flange face seal oring disassembly 1. The paper deals with issue of bearingless electric motor control. A schematic drawing of a tilted rotor is illustrated in fig. Conical bearingless motorgenerators both levitate and rotate the rotor with respect to the stators. A different bearing housing is used on wheel motors see figure 24.
In a sensorless drive, there are no discrete sensor units for. A bearingless motor comprising a multipole motor winding disposed on a stator and a magnetic support winding disposed independently of the motor winding and having a different number of poles from the. Catalog numbers rdbb2901, rdbb2902, rdbb2903, rdbb4101, rdbb4102, rdbb4103. Control analysis of bearingless electric motor 50 mmasa mmbsa mmasb mmbsb mutual inductance between twopole suspension windings and fourpole motor windings. Standard flange mounting, wheel motors and bearingless heavy duty taper roller bearing for supporting shaft rated flow 170 lpm intermittent operation 10% of every minute. X2c is a tool for modelbased development and code generation of realtime control algorithms for microprocessors. Characteristic measurement of the widegap bearingless motor.
Aimed at practising electrical and mechanical engineers and advanced students, magnetic bearings and bearingless drives provides an essential guide to an area of. Basic theory, principles, and variations of electric motors will be presented. Design process of the proposed singledrive bearingless motor is shown. Cartridge ddr direct drive rotary motors kollmorgen. A bearingless switchedreluctance motor for high specific. Different methods and models have been in troduced to help to design and understand bearingless motors. The expression bearingless motor has been introduced in 4 for a rotating device without mechanical bearings. A new control method of suspension force for bearingless. Pdf bearingless induction motors combining functions of both. Integrated solutions that leverage the motors magnetic field to create magnetic bearing forces on the shaft eliminate the need for radial bearings and source of friction. A conventional synchronous reluctance machine syrm may be used as an. Bearingless motor the bearingless motor has the same drive components as the standard and wheel motors with the exception that the motor is assembled without the output shaft, bearings and bearing housing.
This paper overviews the key technologies of the bearingless induction motors, with emphasis on motor topologies, mathematical models, and control strategies. Under these conditions the torque seen by the torquemeter is. Bearingless induction motors combining functions of both torque generation and noncontact magnetic suspension together have attracted more and more attention in the past decades due to their. In this paper, separate models for the axial and radial directions are. Keywordsbearingless motor, homopolar bearing, passive. One unit has two sets of 3phase windings one for rotor suspension force generation and the other for motor operation 15.
Watch video we are celera motion medical celera motion helps medical device oems to advance the development in robotics, imaging, laboratory and diagnostics. Magnetically levitated motor systems based around bearingless motors and generators and magnetic bearings offer a potential step change improvement in motor system lifetime and efficiency, solve. Cleanliness is extremely important when repairing hydraulic motors. A key feature that distinguishes bearingless motor technology is that it. The axial forcetorque motor aftm can generate axial bearing force and drive torque force. A novel singledrive bearingless motor with wide magnetic gap and high passive stiffness is proposed. Examination of layer structure of flexpcb for bearingless. A bearingless switchedreluctance motor for high specific power applications benjamin b. Motor feedback systems bearingless encoders encoders. Choi national aeronautics and space administration glenn research center cleveland, ohio 445 mark. These bearingless housed motors provide a compact design for direct drive applications. A new control method of suspension force for bearingless brushless dc motor long shan, huangqiu zhu, weiyu zhang school of electrical and information engineering, jiangsu university, 2120.
A unit 101 of a first bearingless motor is formed of. This requires the magnetic suspension controllers to address the changing system. This motor is the same as the standard without the shaftbearing assembly, bearing housing and retainer. Himmelstein and company installation and operation. Pdf bearingless permanent magnet synchronous motor using.
Homopolar bearingless slice motor in temple design conferences. The certified motor position 2b in table 2 comes with special connectors and relevant extension cables position 4a and 4b in table 3. An ex conform solution is necessary for the motor cables to leave the ex area. The decoupling control of the two sets is difficult and a key. Oneaxis hysteresis motor driven magnetically suspended. Magnetic bearings and bearingless drives request pdf. Magnetoresistive high temperature bearingless encoder. Control system commissioning of fully levitated bearingless. On a bearingless linear motor capable of selfmagnetic levitation wooyeon kim1, seungjong kim1, jongmin lee 1, sungchong chung2 and sang jo kim3 1energy mechanics. Section 4 describes the bearingless motor subsystem used for the lateral. Disc valve hydraulic motors 4,000, 6,000, 10,000 series. Bearingless motor 5if cfbsjohmftt npups ibt the same drive components as the standard and wheel motors with the exception that the motor is assembled without the output shaft, bearings and bearing.
Use a 516 inch hex wrench to tighten a nominal 25 foot pounds. Bearingless drives incorporate the functions of active magnetic bearings and electrical machine in one unit, which reduces the size, complexity and price of the system chiba et al. The radial rotor position and the rotation are constantly measured by sensors. The bearingless switched reluctance motor bsrm integrates the switched reluctance motor srm with the magnetic bearings, which avoids mechanical bearingsloss and makes it promising in highspeed. A cryogenic highpowerdensity bearingless motor for future electric propulsion nasatm2008215211 june 2008 paper no. A cryogenic highpowerdensity bearingless motor for. Magnetic bearings and bearingless drives 1st edition. Bearingless induction motors combining functions of both torque generation and noncontact magnetic suspension together have attracted more and more attention in the past decades due to their definite advantages of compactness, simple structure, less maintenance, no wear particles, high rotational speed, and so forth. The term bearingless originates from the same idea as the term sensorless. Design of a bearingless outer rotor induction motor mdpi. Other than this, the parts are the same as the standard motor and the same disassembly and reassembly procedures apply.
176 321 702 1033 1443 798 375 1063 738 1238 1408 1443 1455 1426 324 1345 804 830 1176 667 28 1345 206 620 274 922 656 1415 1 356 576 1457 239 1259 762 304 369 353