Motor design for a high-speed electrically-driven Gyroscope

1950 ◽  
Vol 69 (5) ◽  
pp. 446-450
Author(s):  
Gerard P. De Westfelt
Keyword(s):  
High Speed ◽  
Motor Design

scholarly journals High Speed Electrical Drives – Perspective of VFD Manufacturer

2020 ◽  
Vol 178 ◽  
pp. 01006
Author(s):  
Martin Bruha ◽  
Kai Pietiläinen ◽  
Axel Rauber
Keyword(s):  
High Speed ◽  
Technology Readiness ◽  
Power Electronic ◽  
Power Electronic Converters ◽  
Medium Voltage ◽  
Electrical Drives ◽  
Standard Design ◽  
Motor Design ◽  
High Level ◽  
Power Electronic Converter

This paper deals with high-speed electrical drives utilizing power electronic converters (commonly abbreviated as ASD, VFD or VSD). Existing solutions vary mainly on the motor side while the power electronic converter is very similar for all cases. Various advantages as well as technical challenges are discussed and illustrated. At certain stages comparisons between conventional and high-speed drives are made. The paper summarizes the experience of a VFD manufacturer based on state of the art technology in medium voltage and multi-megawatt power range. The authors believe that main complexity around high-speed drives is the motor design while the VFD requires only small adaptations or can sometimes be used directly without any modifications of standard design. The technology readiness is evaluated to be on a medium to high level.

Closed Loop Performance of a Slotless Lorentz Self-Bearing Motor

2003 ◽  
Author(s):  
Hooi-Mei Chin ◽  
L. Scott Stephens
Keyword(s):  
High Speed ◽  
Closed Loop ◽  
Coupling Effect ◽  
Cross Coupling ◽  
Motor Design ◽  
High Speed Rotation ◽  
Bearing Stiffness ◽  
Speed Rotation ◽  
Power Densities ◽  
Tangential Directions

In previous work the authors presented a Lorentz self-bearing motor design targeted for precision pointing and smooth angular slewing applications. The motor also offers potential advantages when operated as a synchronous machine at high speed including larger power densities and shorter shafts. In this paper, the closed loop performance of the motor at low transient speeds (0–588 rpm) is presented. Using these results, several challenges to achieving high-speed rotation are identified and discussed. The most significant is the heavy cross coupling within the actuator which limits bearing stiffness and stability, and is amplified at rotor natural frequencies resulting in potential loss of levitation when passing through critical speeds. Of particular interest is the discovery of a significant cross coupling effect between the radial and tangential directions. A theory is put forth explaining this effect.

Integrated Piezoelectric Linear Motor for Vehicle Applications

2002 ◽  
Author(s):  
Mark Vaughan ◽  
Donald J. Leo
Keyword(s):  
Motor Performance ◽  
High Speed ◽  
Response Times ◽  
Fast Response ◽  
Linear Motor ◽  
Lumped Parameter Model ◽  
Moving Loads ◽  
Drive Frequency ◽  
Lumped Parameter ◽  
Motor Design

The focus of this research was to create a linear motor that could easily be packaged and still perform the same task of the current DC motor linear device. An incremental linear motor design was decided upon, for its flexibility in which the motor can be designed. To replace the current motor it was necessary to develop a high force, high speed incremental linear motor. To accomplish this task, piezoelectric actuators were utilized to drive the motor due their fast response times and high force capabilities. The desired overall objectives of the research is to create an incremental linear motor with the capability of moving loads up to one hundred pounds and produce a velocity well over one inch per second. To aid the design process a lumped parameter model was created to simulate the motor’s performance for any design parameter. Discrepancies occurred between the model and the actual motor performance for loads above 9.1 kilograms (20 pounds). The resulting model, however, was able to produce a good approximation of the motor’s performance for the unloaded and lightly loaded cases. The incremental linear motor produced a velocity of 4.9 mm/sec (0.2 in/sec) at a drive frequency of 50 Hz. The velocity of the motor was limited by the drive frequency that the amplifiers could produce. The motor was found to produce a stall load of 17 kilograms (38 pounds). The stall load of the design was severely limited by clearance losses.

scholarly journals High-Speed BLDC Motor Design for Suction Fan and Impact on the Loss caused by Core Welding

2017 ◽  
Vol 12 (1) ◽  
pp. 126-133
Author(s):  
Hyun-Seok Hong ◽  
In-Gun Kim ◽  
Ho-Joon Lee ◽  
Sung-Chul Go ◽  
Ju Lee
Keyword(s):  
High Speed ◽  
Bldc Motor ◽  
Motor Design

scholarly journals Magnetic Properties of Somaloy 700 (5P) Material Under Round Magnetic Flux Loci

2020 ◽  
Vol 9 (3) ◽  
pp. 2479-2483
Keyword(s):  
Magnetic Properties ◽  
Magnetic Flux ◽  
High Speed ◽  
Core Loss ◽  
Electrical Machines ◽  
Magnetic Flux Density ◽  
Magnetic Cores ◽  
Motor Design ◽  
Speed Performance ◽  
New Material

Electrical machines has enabled human to do their chores with easier and more comfortable way. Most of the current electrical machines require the magnetic cores to operate at higher frequency to meet the demand of high–speed performance. The study of rotating core loss gives big significance to the rotating electrical machines since in real situation, the magnetic flux densities in the electrical machines are rotated during the operation. In this paper, magnetic properties of new material; SOMALOY 700 (5P) are studied by conducting 2-D core loss measurements at 50 Hz, 100 Hz, 500 Hz and 1000 Hz. Magnetic flux density is controlled to be in round shape in clockwise and anti-clockwise directions by using LabVIEW to resemble the actual core loss of rotating machines. B and corresponding H loci are plotted and these collected data are analysed by using Mathcad to obtain the core loss curves at different magnitude of magnetic field and frequencies. The findings show that the rotational core loss is increased with frequencies. At 1.8 T under 50 Hz of rotating magnetic fluxes, 8.9 Watt/ kg is recorded and keep increasing up to 2.4 T. The detail of core loss is important in providing information to the engineers for the motor design proposes.

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