Tunnel Thruster 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 > Tunnel Thruster Tunnel Thruster Designed for easy installation and maintenance. Factory complete with tunnel section Applicable for Dynamic Positioning and manoeuvring of the most advanced and sophisticated vessels for world-wide operations Standard or customized Tunnel Thrusters Brunvoll's portfolio of in-house expertise enables us to develop effective solutions for challenging projects. Our design engineers work together with the yard’s hull design team to achieve cost-effective thruster installations. All Brunvoll Tunnel Thrusters are available in L- and Z-drive configurations Electric motor on bed frame in vertical or tilted position Electric motor on separate foundation with vertical intermediate shaft Brunvoll offers a variety of tunnel extensions ‍ Thruster design with features for heavy duty operations and low life cycle cost Robust design, generous dimensions, 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 Various propeller blade materials and designs available Controllable  pitch propeller and fixed pitch propeller versions available Thruster gearbox can be removed from tunnel with propeller blades in place The tunnel is made of thick steel plate reinforced with stiffener rings 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) ‍ A variety of Thruster Tunnel options The Brunvoll standard Thruster Tunnel is a rigid and robust construction with ring stiffeners and a modular motor foundation. We may also add on a variety of options such as: Extra landing bars adopted to tank top and hull frames Extra ring stiffeners adapted to centre girder Tunnel extensions, either straight cut or cut to suit hull lines Protection grids ‍ Customized solutions – trunk mounted tunnel thruster Thruster unit arranged in a trunk with a bolt in tank top plate Heavy steel structure and bottom guiding arrangement and support by conical studs Reduces the yard’s installation work and responsibility Brunvoll trunk-mounted tunnel thruster unit can be removed for easy service access and repair without dry-docking the vessel ‍ ‍ ‍ 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. TUNNEL THRUSTERS MODEL PROPELLER DIAMETER MM POWER RANGE KW FU 37 850 75 - 200 1000 100 - 250 FU 45 1 225 185 - 300 1375 275 - 450 FU 63 1 550 400 - 700 1 750 600 - 960 FU 74 2 000 800 - 1 400 FU 80 2 250 1 000 - 1 500 FU 84 2 250 1 200 - 2 000 FU 93 2 500 1 400 - 2 200 FU 100 2 750 1 800 - 2 500 FU 105 2 750 2 000 - 3 350 FU 115 3 000 2 500 - 3 500 FU 125 3 250 3 300 - 4 400 FU 135 3 500 4 000 - 5 100 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 Cruise & Yacht SunStone Ships Inc, USA Greg Mortimer Brunvoll CP-Propulsion System, Rudder & Steering gear, Tunnel Thrusters and Control System Open reference sheet Fishing Odd Lundberg AS, Norway Odd Lundberg Brunvoll 2-speed CP-Propulsion System, Tunnel Thrusters and Control System Open reference sheet Offshore Siem Offshore, Norway Siem Helix 1 - 2 Brunvoll CP-Propulsion System, Tunnel Thrusters, Retractable Azimuth Thrusters and Control System Open reference sheet See all references Related content Read more Related Products 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 Automation Systems Starters & VFD Starters for Electric Motors Brunvoll starter systems for constant speed asyncron electric drive motors More information Automation Systems Starters & VFD Variable Frequency Drives Brunvoll VFD systems for variable speed electric drive motors More information See all products Contact Please contact us for any further information you may require about this solution See all contacts Try again, no items found. 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 