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Magnetically Suspended Rotary Blood Pump Mohawk Innovative Technology, Inc. (MiTi) has developed a next generation, implantable blood pump for patients suffering from end stage heart failure. The MiTiHeart ™left ventricular assist device (LVAD), a rotary centrifugal blood pump with a hybrid passive/active magnetic bearing support system, has been developed with substantial support from the National Heart, Lung, and Blood Institute (NHLBI) of the National Institutes of Health (NIH) and internal company funds. The blood pump exhibits low power loss, low vibration and high reliability under transient operating conditions. Unique features of the design include a simple and direct flow path for both main and wash blood flows, non-contact pump rotor, i.e., no rubbing surfaces and relatively large clearances between the pump rotor and housing. (Volume 24 - August 2005) |
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High-Speed, Oil-Free Motorized Spindle MiTi has developed a high-speed, oil-free, motor driven spindle capable of operating at speeds of 60,000 rpm and a power level if 32 kW. Based on the success of this motorized spindle, MiTi has expanded development efforts and is now offering custom motors operating at speeds up to 30,000 or 60,000 rpm at power levels to 64 kW. (Volume 21 - January 2005) |
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150mm Foil Journal Bearing and Hybrid Foil Magnetic Bearing Under a NASA/Air Force and Army sponsored projects, MiTi has demonstrated the ability to scale its foil bearing designs to very large sizes, combine its state of the foil bearings with active magnetic bearings for superior high-speed and high load performance, and operate at temperatures exceeding 1200F. (Volume 20 - November 2004) |
Foil Gas Bearings Enable Oil-Free Compressor Breakthrough MiTi has enabled the breakthrough development of a truly oil-free plant air compressor. Working with Samsung Techwin Co., Ltd. of Korea, MiTi applied its proprietary compliant foil gas bearing design to mount a 125 lb. rotor with integral permanent magnet motor on two radial bearings. (Volume 19 - September 2004) |
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4 Million DN & 1000 °F Operation: From 6 mm to a 150mm Diameter Foil Bearing MiTi has successfully operated its largest compliant foil bearing (CFB) so far at a speed close to 27,000 rpm. This achievement resulted in a breakthrough of 4 Million DN on a 150mm diameter foil bearing. (Volume 18 - March 2003) |
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Mesoscopic Turbojet Simulator Tested at Speeds Above 700,000 rpm on Air Foil Bearings MiTi, in a company funded effort, recently conducted the first successful test of a mesoscopic scale turbojet engine simulator using specially designed miniature air foil journal and thrust bearings. This operation of the simulator rotor and foil bearing system will pave the way for turbine-powered micro and miniature aerial vehicles (MAV). (Volume 17 - January 2003) |
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WJ24-8 Turbojet Engine Demonstration Testing with Air Foil Bearing Williams International, LLC and MiTi, working together under a jointly funded development effort, recently conducted the first successful hot fire test of a turbojet engine with a MiTi air foil bearing. The WJ24-8 turbojet engine, which is the main propulsion engine for the US Navy BQM-74 series of target drones, was selected for this technology readiness evaluation test series to assess performance and reliability benefits of using aerodynamic foil bearings in gas turbine engines. (Volume 16 - December 2002) |
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Tribometer for High Performance Tribomaterials MiTi has developed a high speed, high temperature tribometer for enhancing the characterization of advanced solid lubricant materials. This unit, the HTP5, provides a faster, reduced cost means for conducting reliable correlative testing to support continuing bearing performance advances. (Volume 15 - April 2002) |
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High Speed, High Temperature Tribometers, HTP Series This unique series of high temperature, friction and wear tribometers can also be used as a pin-on-disc tribometer. It can measure the tribological properties of high temperature metallic alloys from room temperature to 900°C. (Volume 14 - February 2002) |
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Compliant Foil Provides Exceptional Damping For Oil-Free, High Temperature Applications A metallic, self-contained, high temperature, compliant foil damper has been developed by MiTi for use in harsh environments where oil-free operation is highly desirable. Extensive testing in a rotor system test rig (Free-Orbit Test Rig) simulating the hot section of a gas turbine engine, with temperatures up to 1000°F, produced results exceeding required damping for this type of system. (Volume 13 - Spring 2002) |
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A High Speed, High Temperature Tribometer This unique high temperature friction and wear tribometer can be used as a pin-on-disc tribometer. It can measure the tribological properties of high temperature metallic alloys from room temperature to 900 °C. The test atmosphere is established by a controlled flow rate of a purge gas. All components within the test chamber are compatible with oxidizing, inert or reducing gases. (Volume 12 - September 2001) |
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A Unique Powder Lubricated Journal Bearing Demonstrated to Operate up to 3 Million DN The Powder-Lubricated, Quasi-Hydrodynamic Journal Bearing (PLQH) is a highly sophisticated and unique technology, which has only very recently been developed and demonstrated to operate up to 3 million DN. It is based on 15 years of work conducted by Dr Hooshang Heshmat, who introduced the Quasi-Hydrodynamic Theory. This Theory states that powders can be caused to behave like liquid lubricants under appropriate geometries and pressures. When so applied, a hydrodynamic like pressure, this lubricates the bearing and creates a load capacity. (Volume 11 - February 2001) |
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High Temperature Non-Contact Seal Tested A MiTi novel, non-contacting, compliant foil gas seal ( CFS) has been designed and successfully tested at temperatures to 600 E C and surface velocities of up to 1200 ft/sec in a dynamic simulator representative of a small gas turbine engine hot section. (Volume 10 - Fall 2000) |
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100mm Diameter Self-Contained Solid/Powder Lubricated Auxiliary Bearing operated at 30,000 rpm A major breakthrough development of a self-contained solid/powder lubricated auxiliary bearing (PLAB) has recently been successfully operated at speeds to 30,000rpm and loads to 445N (100lb) for record breaking operations equivalent to 3 million DN. (Volume 9 - April 2000) |
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Auxiliary Bearing Developed for 140mm Shaft with 1000 Pound Load at 18,000 RPM! MiTi has recently delivered a prototype of the patented Zero Clearance Auxiliary Bearing (ZCAB) to a major gas turbine engine manufacturer. This auxiliary bearing is designed to operate at 18,000 RPM with radial and axial loads of 1,000 pounds on a 140 mm diameter shaft. Its unique design allows it to capture and re-center a shaft if there is a failure of the magnetic bearing system. It also addresses short term overload through load sharing. (Volume 8. - September 1999) |
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High Speed Auxiliary Bearing Demonstrated As part of a program to advance the state-of-the art in turbomachinery design by developing new high performance rotor support systems, MiTi is addressing the auxiliary bearing needs of the AMB through the development of the Zero Clearance Auxiliary Bearing (ZCAB). This patented bearing concept is a significant departure from conventional wide clearance rolling element or solid bushing bearings. (Volume 7 - May 1999) |
Oil-Free Turbocharger Demonstration Paves Way To Gas Turbine Engine Applications MiTi successfully operated the oil-free, 150 Hp turbocharger to 95,000 rpm (100% speed) with turbine inlet temperatures to 1200 EF. This breakthrough development in turbochargers for diesel engines was made possible by MiTi’s patented compliant surface foil air bearings. These self acting bearings support the rotor on a cushion of air while the rotor operates at very high speeds and temperatures. Operating with gas as the lubricant reduces the drag on the rotor for improved response, eliminates the introduction of polluting contaminants in the engine exhaust, and offers reductions in turbocharger bearing related maintenance costs. (Volume 6 - Spring 1999) |
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Zero-Clearance Auxiliary Bearing As part of MiTi’s continuing program to develop reliable, low maintenance back-up bearings for magnetic bearing supported turbomachinery, a novel back-up bearing has been developed and patented. This bearing, the Zero Clearance Auxiliary Bearing (ZCAB), solves most of the problems associated with conventional wide clearance and solid bushing back-up bearings. (Volume 5 - January 1999) |
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942 Pounds on a Film of Air A MiTi developed 4 inch diameter by 3 inch long, self-acting, compliant foil bearing has successfully supported a steady load of 942 pounds with a superimposed dynamic load of 200 pounds for a shaft spinning at 22,000 rpm. This load is more than 5 ½ times larger than previously demonstrated maximum load levels for foil bearings. With this successful test, it is clear that the hydrodynamic, compliant foil bearing is poised to revolutionize the design of high speed rotating machinery, and fulfill the prediction that foil bearings will be part of the next generation of aircraft gas turbine engines. (Volume 4 - Winter 1998) |
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Foil Bearing Used as Back-Up for Magnetic Bearing MiTi successfully demonstrated the use of a state-of-the-art foil bearing as a back-up bearing for a magnetic bearing system. In these tests, the response of an oil-free, hybrid foil/magnetic bearing system to thirteen different magnetic bearing failure and recovery modes was evaluated at realistic operating speeds. This data is also being used to guide development of an expert system for magnetic bearing simulation and predictive diagnostics. (Volume 3 - Fall 1998) |
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Hybrid Foil Magnetic Bearing Tested MiTi successfully operated its oil-free, hybrid bearing to over 30,000 rpm. This breakthrough development was accomplished under a US Army Small Business Innovation Research Phase II sponsored program and demonstrated for the first time ever, the operation of a hybrid foil and magnetic bearing at a size consistent with gas turbine engine and auxiliary power unit applications. Operation of the 100 mm diameter foil bearing at 30,000 rpm exceeds conventional rolling element bearing DN capabilities by at least 50%. (Volume 2 - Summer 1998) |
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Bearings Demonstrate High Load and Temperature Capabilities In a collaborative effort with engineers at NASA’s Lewis Research Center, a MiTi Compliant Surface Hydrodynamic Gas Journal Bearing has demonstrated load capacities exceeding 32 psi at 36,000 rpm while subjected to 650 °C temperatures. This ground breaking development combines a new state-of-the-art MiTi bearing design and advanced NASA high temperature solid film coatings. (Volume 1 - Spring 1998) |
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