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 NEPod series electrical propulsion system

As a scientific and technological innovation-oriented high-tech enterprise, Nanjing High Accurate Marine Equipment Co. , Ltd. summarizes the design and manufacturing of mechanical azimuth thruster and on the basis of hundreds of real ship data, breaks through the compatibility research of polar ship pod propulsion device, overall design research of pod propulsion device, reliability design technology research on pod propulsion device, the technical research on the design of high-torque anti-overload pod propulsion motor and drive device, the research on the hydrodynamic and load characteristics of the pod propulsion device and the experimental verification technology of the pod propulsion device successively, has developed the NEPod series of pod-type electric propulsor. We have published 9 papers and more than 40 patents, of which 21 are invention patents, and 15 patents have been granted, 12 thematic studies were formed. Taking the permanent magnet pod propulsor of international leading level as benchmark, the motor efficiency completed鈮97.5%, insulation class H-class, temperature rise <80K, rudder accuracy 鈮ぢ 1 degree. The prototype design, manufacture and class certification work of 5MW permanent magnet pod with polar ice class PC3, is appraised by provincial accreditation committee the independent development of the largest domestic specifications pod-type electric propulsion system, the overall technology is in the leading position of domestic market and same level of international market. NGC Marine has built a mature pod propulsion development industry chain in China, is capable to deliver 20 sets of independent brand NEPod series below 10MW per year, including the design, high-precision manufacturing and testing.

Performance
Parameter
Control system
Design
Production and Inspection

Based on its success and rich experience in mechanical azimuth thruster, NGC Marine has developed NEPod series permanent magnetic electrical pod propulsion by moving the electric motor down into underwater housing so as to omit the gear parts and with the motor driving the propeller directly.

 

      

Layout of mechanical azimuth thruster system in engine room      Layout of pod electrical propulsion system in engine room

Advantages of pod electrical propulsion compared to traditional mechanical azimuth thruster:
1.Convenient for structural layout of the vessel; demanding less space in engine room; highly flexible for ship design, construction and operation.
2.Improving and optimizing wake field of hull and propulsion system, thus to get better hydrodynamic efficiency;
3.By removing the mechanical shafting and gearing parts, unnecessary  mechanical efficiency loss of 3% could be avoided; consequently vibration and noise of thruster can be reduced significantly and then to reach design requirements for grade 1 of modern cruise ship comfort level;
4.Efficiency of PM Motor with big length to diameter ratio can be up to 97% or higher by sea water direct cooling or with air cooling as an additional cooling method.
5.Performance of NEPod in high ice class region is much better than traditional azimuth thruster. Effective energy saving of pod propulsion can be up to 10% compared to traditional azimuth thrusters.

        

Model

Power

(Kw)

Max.Propeller speed

(rpm)

Propeller dia.

D(mm)

A

(mm)

B

(mm)

C

(mm)

E

(mm)

NEPod420

150-220

700

900~1200

1700

930

890

520

NEPod510

200-315

700

1000-1300

1800

930

900

550

NEPod590

300-400

630

1000~1400

2000

1100

900

650

NEPod670

355-630

560

1200~1600

2400

1250

1000

800

NEPod760

560-1000

420

1500~2100

2700

1400

1000

1100

NEPod850

900~1400

360

2000~2500

3840

1950

2300

1800

NEPod960

1300~2000

320

2400~3000

4800

2445

2300

2200

NEPod1200

1800~3350

260

3000~3500

5730

3300

2300

2400

NEPod1400

3150~5000

230

3400~4000

6800

3500

2300

2520

NEPod1600

4500~7500

220

4000~4500

9000

5000

2600

5050

NEPod1800

7000~10000

210

4200~4500

9400

5400

2900

6000

               

 

                                    Maximum permissible angle range a & b: 6

By considering specific overall requirements of different types of vessels, NGC Marine proposes the most suitable NEPod type, i.e. Nozzle type, high steering type or Contra-rotating type to improve the propulsion efficiency and maneuverability.

                                   

 Nozzle type                                                              High steering type                                                          Contra-rotating type

NEPod6000 remote control system is full follow-up propulsion control system based on PLC controls. Steering control and motor speed control can be realized by a joint control handle at the bridge. Turning the handle horizontally would control steering of NEPod in 360掳; Push and pull the handle forward and backward would control the motor speed. When there is failure in follow-up control, rapid switch to backup control system or to local control of steering and speed is available.

 

Main functions    
1.Speed control of main motor
2.Control of rudder angle
3.Load control of main motor
4.Monitoring of sliding ring signal
5.Monitoring and alarming
Control mode
1.Follow-up control by handle(rudder angle/speed)
2.Non-follow up control by button (rudder angle/speed)
3.DP/JOY mode
4.Auto pilot mode
5.Joint control mode
System interface
1.DP interface
2.JOYSTICK interface                   
3.VDR interface
4.Auto pilot interface       
5.Integrated alarm interface

  

                                                                                        Advanced hydrodynamic calculation and testing methods  

                                                                                        3-D product design and simulation            

          

                                                                                      CAE finite element analysis

 

                                                                                Shafting whirling vibration calculation with DNV software