Azimuth Thruster with Push Ducted Propellers Meet us Sustainability Brunvoll Components Global Sales & Service Network References Media & Downloads News & Stories About Ship Segments Products Retrofit & Upgrade Service Careers Contact Meet us Sustainability Report Brunvoll Components Global Agent Network References Media News & Stories About Products > Azimuth Thruster with Push Ducted Propellers Azimuth Thruster with Push Ducted Propellers Built for heavy duty operations, designed with emphasis on maximum bollard pull and focus on hydrodynamic- and total energy efficiency with low drag and good manoeuvrability Units for various installation configurations All Brunvoll Propulsion Azimuth Thrusters are available with L- and Z-drive configurations. Weld-in fixed mounted. Well mounted bolt-in arrangements that allows the complete Thruster to be lifted out/into the ship as one piece without dry docking. Great flexibility in stem lengths/propeller arm lengths. Subsea Unit designed for heavy duty operations and low life cycle cost Robust design, and attention to details make for trouble-free performance. Brunvoll focuses on excellent technical solutions to ensure that our thruster units can handle all the challenges of the marine environment. Replaceable propeller blade bearing liners Propeller blades are replaceable inside the nozzle Various propeller blade materials and designs available Controllable  pitch propeller and fixed pitch propeller versions available Various propeller nozzle designs available ‍ ‍ Advanced multiple sealing system An advanced multiple sealing system is used for the propeller shaft to provide an ideal environment for the working parts Non-polluting sealing solutions available for use of Environmentally Acceptable Lubricants (EAL). Limited amounts of EAL required The design complies with US EPA Vessel General Permit (VGP) Increase propulsion efficiency with the ideal nozzle profile A ducted propeller provides up to 30% higher thrust at low speeds compared with an open propeller. The Brunvoll DL1 nozzle is the newest addition to Brunvoll’s nozzle lineup. It provides excellent bollard pull capabilities and high energy efficiency at higher vessel speeds. Read more about the DL1 "Dragless"- nozzle The Brunvoll HE nozzle profile is recommended for ships with high bollard pull requirements and strong astern performance. The 19A nozzle profile is recommended for a wide range of vessels due to its strong overall performance and high bollard pull capabilities. The 37 nozzle profile is recommended for vessels requiring equal performance in both flow directions, typically for DP and astern operations. Brunvoll works with you to find the most suitable nozzle specification for your vessel’s operational profile. AZIMUTH THRUSTERS PUSH DUCTED PROPELLER MODEL PROPELLER DIAMETER MM POWER RANGE KW AUP/AWP 63 1 650 400 - 680 AUP/AWP 74 1 900 - 2 100 750 - 1 200 AUP/AWP 84 2100 - 2 300 1 000 - 1 700 AUP/AWP 93 2 400 - 2 600 1000 - 1 850 AUP/AWP 105 2 600 - 2 750 - 2 900 1 600 - 2 600 AUP/AWP 115 2 900 - 3 050 - 3 200 1 900 - 3 500 AUP/AWP 125 3 250 3 100 - 3 700 AUP/AWP 135 3 750 3 900 - 4 600 *Other sizes on request ‍ Starter characteristics Direct On-Line starter Starting current: 5-10x Nominal motor current (I N ) Pros: Low price and high starting torque Cons: High in-rush current Description: The Direct On-Line (DOL) starter consists of a contactor and a protection device such as a circuit breaker. The contactor is energized when the start button is pressed, and the full line voltage is connected to the motor. Motor is started with propeller in zero pitch position (I ZP ). Diagram Voltage curve Current curve Click the images to enlarge Star-Delta starter Starting current: 2-3x Nominal motor current (I N ) Pros: In-rush current reduced with approx. 60% compared with DOL Cons: Reduced starting torque Description: The star-delta starter method applies reduced voltage to the motor, thus reducing current, during startup. This method requires that both ends of motor winding terminals are available. When connected in star each winding has less voltage (1 / √3 ~ 60%), and thus will have reduced starting current and torque. When full speed is reached the motor is connected in delta, having full torque available. Propeller pitch can be increased, and load applied when motor is connected in delta. Motor is started with propeller in zero pitch position (I ZP ). Diagram Voltage curve Current curve Click the images to enlarge Auto-Transformer Starting current: 2-3x Nominal motor current (I N ) Pros: In-rush current reduced with approx. 60% compared with DOL Cons: Reduced starting torque Description: Auto-Transformer also applies reduced voltage in steps to the motor during startup. The transformer voltage ratio can be designed to the application, typically having a 50-70% motor voltage during startup. The motor consumes less current at a lower starting voltage. For example, with a 50% tap on the Auto-Transformer, the motor draws half its rated current, or about 25% of what it would draw with a DOL starter. Motor is started with propeller in zero pitch position (I ZP ). Diagram Voltage curve Current curve Click the images to enlarge Electronic soft starter Starting current: 2-2,5x Nominal motor current (I N ) Pros: In-rush current reduced  Cons: Reduced starting torque. Based on electronics Description: An electronic soft starter is a starting device that controls the way electricity is provided to the motor by using active switching devices such as thyristors. The device works in both in-line and in-delta configuration modes in three-phase motors.  This starting method is ramping up the motor voltage in the starting sequence resulting in a reduced start-up current, allowing for a smooth and surge-free increase in motor torque. The voltage dips, stress, and wear and tear on the mechanical parts are all reduced as a result. Due to the thyristors there will be harmonic distortion of the current, and the influence on system voltage will depend on starting current and system impedance. Motor is started with propeller in zero pitch position (I ZP ). Diagram Voltage curve Current curve Click the images to enlarge Frequency converter starter Starting current: 0,5x Nominal motor current (I N ) Pros: In-rush current reduced. Full speed and torque control Cons: THD generated, filters required. Based on electronics Description: This is an electronic-controlled approach for starting asynchronous motors smoothly. It controls the frequency and current for the motor with electronics inverter circuits, avoiding large startup current. The thruster system's mechanical parts will be protected from high load because of the smooth start-up, and the this will also reduce the load on generators during startup compared to line-starter options. Depending on required performance torque and current may be below nominal values during startup. This is the high-end solution for the starting the thrusters, giving benefits such as smooth start, better energy economy, reduced wear and tear and process optimization.  Other benefits include motor speed stability during load changes and a longer motor life overall. Motor is started with propeller in zero pitch position (I ZP ). ‍ Frequency converter starters may have different interface towards the main switchboard where 6-pulse rectifier is the most common, but both 12/24 pulse and Active Frontend (AFE) are used.6-pulse starters are the most common type, widely used due to the compact design and availability.The disadvantage with the 6-pulse starter is the increased THD during startup, particularly in smaller power system with large thrusters this might be an issue.  ‍ To mitigate the THD a 12 or 24 pulse transformer and rectifier may be chosen, typically used for larger thrusters in larger ships.  Frequency converter starters with active front end guarantees sinusoidal current and does not require a transformer. The AFE rectifier and LCL filter is more spacious than the 6-pulse rectifier and is suitable for high end solutions and ships with relatively small power system compared to thruster power. Diagram Voltage curve Current curve Click the images to enlarge Complete system deliveries One source - one responsibility For optimal performance Brunvoll takes responsibility for delivering complete systems and for providing support throughout the lifetime; from design, production, installation and commissioning, through daily operation. Ask us for a complete thruster system including: Electric drive motor, asynchronous or Permanent Magnet type Starter or VFD for the motor BruCon Control, Alarm and Monitoring system BruCon Joystick and DP ‍ Compile your vessel from Brunvoll's  product range The wide product range of Brunvoll gives a unique configuration flexibility of integrated propulsion, manoeuvring and automation systems, see Propulsion Systems. Videos No items found. Technical Information Interested in further information about this product? Download the product sheet available to see more Download References Selected Brunvoll references Offshore Van Oord Ship Management BV Calypso Brunvoll Azimuth Propulsion Thrusters, Combined Retractable Azimuth/Tunnel Thruster, Tunnel Thrusters and Control System Open reference sheet Offshore SeaRenergy TBN Vard SeaRenergy A - B - C Brunvoll Azimuth Thruster Propulsion, Retractable Azimuth Thrusters, Tunnel thruster and BruCon Propulsion and Thruster Control Open reference sheet Offshore Nexans Norway AS Nexans Aurora Brunvoll Azimuth Propulsion Thrusters, Retractable Azimuth Thrusters, Tunnel Thrusters and Control System Open reference sheet Aquaculture Intership AS, Norway TBN for Intership Vsl 1: Brunvoll CP-Propulsion System, Tunnel Thrusters, BruCon DP and Control System / Vsl 2: Brunvoll Azimuth Propulsion, Tunnel Thrusters, BruCon DP and Control Systems Open reference sheet See all references Related content Brunvoll will supply azimuth propulsion and manoeuvring system for the world’s first green fuel SOV from Esvagt Brunvoll has secured an important contract for a complete propulsion and manoeuvring package for the new Service Operation Vessels (SOV) for Esvagt. The vessel is HAV Design 833 SOV and will be built at Cemre Shipyard. The vessel will be the world’s first service operation vessel that can operate on green fuels. Read more News Related Products Retractable Azimuth Thrusters Retractable Azimuth Thrusters Retractable Azimuth Thruster Compact design – minimal footprint – access for visual inspection of vital parts – top-mounted electric motor More information Tunnel Thrusters Tunnel Thrusters Tunnel Thruster Brunvoll Tunnel Thrusters are designed for the most demanding requirements and are used on all types of vessels. More information Automation Systems Propulsion & Manoeuvring BruCon Propulsion & Thruster Control The Trusted Control System from Brunvoll for Propulsion and Thrusters. More information Automation Systems Autonomy BruCon DP & Joystick Control Systems Safe, accurate and effortless control of the vessel at your fingertips More information See all products Contact Please contact us for any further information you may require about this solution See all contacts Bernt Rune Riksfjord VP Sales, Brunvoll AS  +47 911 26 221   Bernt.Riksfjord@brunvoll.no Curious about this product? Request for information about our solutions, products and services Send request    Brunvoll AS Eikremsvingen 2C NO-6422 Molde office@brunvoll.no +47 71 21 96 00 Brunvoll Volda AS Hamnegata 24 NO-6100 Volda volda@brunvoll.no +47 70 05 90 00 Brunvoll Mar-El AS Storvegen 48 NO-3880 Dalen mar-el@brunvoll.no +47 35 07 58 00 Products Ship Segments Service Careers Contact Global Sales & Service Network References Media News & Stories About Newsletter Global Sales & Service Network References Media News & Stories About Newsletter Design by Privacy policy 