Product

Choose from: AC motors Basic refurbishment and repair Bipolar drives Brake motors Custom mechatronics Dampers DC motors (small) DC motors (special duty) Drive Cards Dual speed motors Dual voltage motors Eurocard Drives Five phase drives Five phase motors Gearboxes Geared dc motors Hollow shaft motors Hybrid stepper motors Liquid cooled motors Low magnetic motors Magnetic clutches Microstepping drives Naval motors Permanent magnet steppers Prototype development Rotary encoders Servos Shock resilient motors Stepper drives Stepper motors Submersible motors Surface cooled motors Synchros Unipolar drives

Specialist AC and DC motors for surface and submersible applications

See also

Astrosyn’s design, manufacturing and support capability has been developed for an extended range of AC and DC special-duty electric motors to meet the most stringent Naval Engineering Standards. The resultant performance parameters frequently apply directly to complex commercial projects...

• Ultra low vibration
• Shock protection
• Submersible operation
• Weather resistance
• EMC compliance
• Temperature extremes
• Magnetic field compensation
• Flame proofing
• Electrical noise reduction

A Specialist AC and DC Motor Product Guide can be viewed as an Adobe Acrobat document (1.4MB).

Special-duty AC Motors
Specialist ac motors are used to power a range of critical marine and submarine services including pumps, compressors, fans, bow thrusters, sonar and radar systems. Power ratings span a range up to 750kW. Submersible applications include sewage and waste water pumping, dredging, deep well sinking and offshore drilling platforms.

Special-duty shock resistant AC motors type 43 AC motors to meet naval requirements for equipment emitting low noise & vibration spectra Capable of withstanding mild shock to 30g in all directions Available in IEC frame sizes from 56 to 400L Standard range constructed with winding insulation class F Minimum housing protection IP44. High shock tolerant AC motors type 50 High shock level tolerance Compliant with the NSSII naval standard All type 50 AC motor housings are made from nodular cast iron

type 60 Incorporates low-mass high shock resistant design Particularly applicable to pumping applications which benefit from close coupling of the motor to the equipment being driven. Extreme shock tolerant AC motors t ype 48 Features a steel welded housing Performance levels combine ultra low noise and vibration with extreme shock tolerance. This range is also available flame proofed to Eexde (Zone 1), suitable for operation in hazardous environments Submersible AC Motors Astrosyn's submersible AC motors are designed for continuous or intermittent immersion, with capability for surface or forced cooling and various seal options. Typical applications include... Deep well sinking Dredging Sewage & Waste water pumping Offshore drilling platforms Surface-Cooled Submersible Motor type 55 Designed for continuous submersible operation, or operation only when submerged Available in power ratings up to 500kW and IEC frame sizes up to 450 Standard range designed with mechanical seals, lipseals or airbell construction Winding insulation classes F or H available and protection rating is up to IP68 Forced-Liquid Cooled Submersible Motor type 99 Cooling by forced liquid flow permits operation at maximum power in both submerged and dry conditions Excellent cooling enables a high output to be achieved from a small frame size. Features very low airborne noise emission Available in power ratings up to 500kW and IEC frame sizes up to 450 Winding insulation classes F or H available and protection rating is up to IP68 Low Magnetic AC Motors Astrosyn offers a range of AC motors developed to minimise strayfield magnetic and acoustic signatures. Widely used on board mine counter-measure vessels such as minehunters and minesweepers, these motors are available in protection classes from IP54 to IP68, with standard shock protection up to 60g. Two options are available for reduced strayfield emission... Low Magnetic type 53 With low magnetic materials and designed to minimise strayfield and acoustic signatures The standard range offers shock protection up to 60g Protection ratings from IP54 to IP68, and winding insulation F or H Integrated Strayfield type 54 Features strayfield compensation coils which automatically track the motor load to achieve a significantly reduced strayfield signature without the use of ferromagnetic materials or complex electronics Integrated strayfield compensated and degaussing design does not require any additional space or larger frame sizes See also dc motors

Motor Refurbishment & Repair
Astrosyn offer a comprehensive repair service for AC and DC motors of our own manufacture and for those originally supplied by other specialist companies.

Stripdown & Survey Initial inspections (visual, mechanical and electrical) External cleaning No-load testing Disassembly Internal cleaning Inspection of subassemblies and/or parts Measurement of shaft and housing fits Report findings Basic Refurbishment Reclaiming of bearing fits (shaft and flanges) Replacement of bearings Assembly No-load testing Airborne noise measurements to NES847 Structure borne noise measurements to NES813 Touch up paint system; finishing Test report and Certificate of Conformity Major Repairs Flange machining and shaft repair Removal of old windings, rewind and varnishing Fitting new thermistors to NES requirements Replacement of armatures Skimming of rotors and stators to adjust air-gap