NEPod series electrical propulsion system_NGC Marine - Nanjing High Accurate Marine Equipment Co.,Ltd

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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