5 MW US Navy Motor
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5 MW US Navy Motor Clive Lewis ALSTOM 23 October 2003 IEE, London Approved for public release; distribution is unlimited. 5 MW Navy Motor for ONR. Seventeen month contract awarded 14 February 2002 to complete design of 5 MW motor as a technology demonstrator motor for a full-size HTS motor

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5 MW US Navy Motor

Clive Lewis

ALSTOM

23 October 2003

IEE, London

Approved for public release; distribution is unlimited


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5 MW Navy Motor for ONR

  • Seventeen month contract awarded 14 February 2002 to complete design of 5 MW motor as a technology demonstrator motor for a full-size HTS motor

  • Fabrication and factory testing of 5 MW motor

  • Fabrication and factory testing of COTS drive VDM5000

  • Perform factory testing on the motor and drive separately and then as an integrated system to validate methods for predicting machine performance

  • Demonstrate and characterize HTS marine motor performance as an integrated motor and drive system

  • Deliver the system to ONR by 14 July 2003


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5 MW Navy MotorTeam

  • AMSC (Prime contractor):

    • Design, fabrication and testing of rotor

    • Design, fabrication and testing of rotor cooling system

    • Overall motor electromagnetic design

  • ALSTOM Power Conversion:

    • Design (electromagnetic and mechanical), Structure borne noise modeling, fabrication and testing of the stator, frame and bearings

    • Motor assembly

    • VDM 5000 COTS drive

    • Factory testing of motor, drive and combined system

  • Northrop Grumman Ship Systems:

    • Shipbuilding and integration expertise


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HTS Ship Propulsion MotorNavy Program Achievements

Cooler

  • Key achievements of 2000*

    • Defined specifications for the 5 MW motor for component development

    • Identified critical components for development

    • Performed key component development work

  • Key achievements of 2001*

    • Designed 5 MW motor

    • Started manufacturing 5 MW motor components

  • Key achievements of 2002**

    • Completed rotor and stator fabrication of 5 MW motor

  • Key achievements of 2003**

    • Assembled motor and performed factory testing

    • Delivered 5 MW motor

    • Preparing to conduct land based testing

Rotor

Motor

* Funded by the Office of Naval Research

** Funded in part by the Office of Naval Research


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5 MW Motor Specification

  • Application: Ship propulsion

  • Type: Synchronous

  • Output: 5000 kW at 230 rpm,

  • Rated torque: 207,000 Nm

    • Comparisons AMSC 5000 hp HTS motor: 19,800 Nm Siemens 400 kW HTS motor: 2500 Nm

  • Rotor: With cryostat containing high temperature superconducting field coils

  • Stator: Normal temperature, liquid cooled, airgap winding


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Advantages of HTS Motors for Naval Ship Propulsion Applications

  • High power density in low speed, high torque motors

  • High efficiency, particularly at part load

  • Low noise


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The rotor and associated hardware was tested at AMSC including:

Excitation up to full current

Refrigeration operating temperature in full and degraded modes

Field winding up to full design current

Rotor balanced in cold state at ALSTOM

Rotor Manufacture

Successful rotor field winding testing has validated HTS field winding and its cooling system.


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Stator Design including:

  • Airgap winding

    • Enables operation at higher flux density than a winding with iron teeth - hence greater output

    • Stator coils must be made from transposed litz wire to avoid large eddy current losses

    • Torque is exerted on the stator conductors rather than the iron teeth - this torque must be supported and transmitted to the stator frame

  • Liquid dielectric cooled

    • Good heat transfer for high power density

    • Good electrical insulation performance


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Stator assembly was designed, fabricated and tested by ALSTOM

Stator Manufacture

Coil Manufacture

Completed Stator

Successfully completed construction of air-core stator.


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Assembly ALSTOM

  • Motor assembly and test at ALSTOM Electrical Machines, Rugby UK

  • Assembly completed January 03


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Factory Testing ALSTOM

  • Extensive factory testing between February 2003 - June 2003

  • Testing in two stages

  • No load open circuit and short circuit testing

    • Standard synchronous motor testing to IEEE 115

    • Load testing with VDM 5000 drive up to rated motor torque

  • Testing carried out at ALSTOM, Rugby by a joint ALSTOM and AMSC team


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No Load Testing ALSTOM

  • Open Circuit and Short Circuit testing to IEEE 115

    • Determine motor parameters

    • Determine motor efficiency under full load and part load conditions

    • Determine motor temperature rise under full load conditions

  • Motor achieved or exceeded design targets

  • Completed March 2003


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Load Testing ALSTOM

  • Load testing with 2.5 MW DC machine


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Load Testing ALSTOM

  • Motor driven by VDM5000 COTS PWM Drive to demonstrate and characterize the HTS marine motor performance as an integrated motor and drive system

  • Loaded by 2.5 MW DC machine up to rated torque at half speed, and half load at full speed. Demonstrated mechanical capability of rotor and stator construction to deliver continuous rated torque.

  • Reliability testing to repeatedly cycle the motor up to rated torque and rated temperature successfully completed

  • Structure borne noise testing confirmed low noise operation

  • Stray flux levels comparable with conventional motors

  • ONR witness testing completed June 2003


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Factory Testing Summary ALSTOM

  • Heat Run at rated torque, rated stator current concluded motor will deliver the rated torque with temperature rise predicted from no load tests

  • Demonstrated mechanical capability of rotor and stator construction to deliver continuous rated torque

  • The basic rotor and stator technology has worked well and without any problems

    • No redesign or rework of the rotor or stator was required during or following the testing

  • 5 MW Motor and Drive were delivered to ONR at the Center for Advanced Power Systems (CAPS) on 22 July 2003


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5 MW Navy Motor ALSTOMFuture Plans

  • ONR selected CAPS at Florida State University to perform the initial land-based tests of the 5 MW motor

  • The 5 MW motor and drive will be integrated in late 2003 for no-load testing

  • The Load machine is on order allowing system integration and load tests to start in February 2004

  • The 5 MW Motor and Drive will be moved to NSWCCD-SSES Philadelphia in late of 2004 for further testing by Navy personnel

  • The successful operation of the largest HTS propulsion motor will be demonstrated through these differing test scenarios providing the Navy with hands-on experience


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