launch point halbach motor presentation 2010
TRANSCRIPT
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High Efficiency, High Power Density
Electric Motors
Mike RicciVice President, Engineering
High Efficiency, High Power Density
Electric Motors
Mike RicciVice President, Engineering
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A brushless permanent magnet motor/generatorAxial flux configuration (pancake shape)
Allows for smaller gaps, higher efficiency than a radial configurationDeflection from centrifugal forces and CTE mismatches are parallel to gap
Uses two Halbach arraysHalbach arrays concentrate magnetic field without using ironOptimized pole count to maximize field in gap, typically ~90% of Br
Highly efficientHalbach arrays generate a field of >1 tesla in the gapLitz wire results in very low copper eddy current lossesThere is no iron: no hysteresis or iron eddy current losses
LightweightCarbon fiber can be used in place of iron for structureThe motor is magnet, copper, carbon fiber – each ideal for its purpose
Attributes of the LaunchPoint motor:Attributes of the LaunchPoint motor:
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Motor ComponentsMotor Components
Three phase, litz wire winding
Halbach array
Impeller ring pulls air over winding for cooling
Carbon fiber backing plate
Carbon fiber spokes
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Halbach arrays are a key enablerHalbach arrays are a key enabler
The dual Halbach array has a much stronger field for a given size and weight:
A Halbach array is an arrangement of magnets:
The field is concentrated on this side
The field is cancelled on this side
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The best balance for your applications…The best balance for your applications…
There is a tradeoff between:
PowerEfficiencyLightweight
The LaunchPoint design offers the best performance:
For a given power and efficiency requirement, it will provide the lightest weight motor possible
efficiency
power lightweight
The LaunchPoint motor is powerful, efficient and lightweight
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DARPA UAV MotorDARPA UAV MotorMotor performance:
7 horsepower @ 8400 rpm1.4 pounds95% efficient at 7 hp, 8400 rpm5 hp/lb6” diameter
Developed under an SBIR Phase I grant
Target application is an electric powered, ducted fan UAV
This performance is unrivaled
No other motor has 5 hp/lb at 8400 rpm while maintaining 95% efficiency
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Hardware validation of modelsHardware validation of models
Analytical model developed, validated
Optimizes thermal, fluid dynamics, electro-magnetic
Winding tooling has been developedHalbach array assembly tooling developedThermal design has been tested and validatedFirst motor has been completed and is in testing
Initial preliminary results continue to validate models
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Three phase, litz wire winding
Halbach array
Impeller ring pulls air over winding for cooling
Carbon fiber backing plate
Carbon fiber spokes
The design can be scaled upThe design can be scaled up
A larger motor suitable for the DARPA Transformer program:
18” diameter15 kilograms97% efficient at 150 hp, 3500 rpm97% efficient at 100 hp, 2700 rpmCapable of up to 5 hp/lb
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Motors can be stacked upMotors can be stacked up
Rotating components:
In this configuration, the stator is held from the outside
Stationary components:
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DARPA Vulture programDARPA Vulture program
Aurora conceptBoeing concept
Lockheed Martin concept
Optimized for efficiency and weight at very low shaft speeds
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Other well suited applicationsOther well suited applications
Electric aircraft propulsion:
SolarFuel cellsBatteryVTOL hybridDucted fan UAVs
As a generator for:Auxiliary, environmental powerSolid state directed energyStarter motor/alternator
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Call today to discuss your application!Call today to discuss your application!
Mike RicciVice President, Engineering
[email protected](805) 683-9659 x244