Wind Turbine Magnets for MW Generator.

<

  • Model NO.: 150216-X01
  • Shape: Arc,Segment ,Irregular
  • Grade: L-42ht
  • Trademark: TC
  • Origin: China
  • Application: Industrial Magnet, Motor Magnet
  • Coating: Phophated,Passivated
  • Shape:Arc,Segment: Application:Generators of Wind Turbines
  • Specification: ISO9001: 2000 & SGS TS16949, ISO14001
  • HS Code: 85051110

Neodymium Magnets in Wind Turbines & Generators

All we have already known, the wind turbines & generators can power a house with the electricity converted from wind energy. The application of All we have already known, the wind turbines & generators can power a house with the electricity converted from wind energy. The application of Neodymium Magnets has greatly improved the energy-efficiency of wind turbines & generators.  But how do they make all these possible? In this article we focus on the wind turbine structure and the use of NdFeB magnets in generator systems.

Until relatively recent years, almost all commercial wind turbines had the same type of powertrain features as shown in Pic. 1: The rotor blades are mounted to a cast-iron hub. The hub is mounted onto the drive shaft which passes the nacelle via a rotor bearing into a mechanical gearbox. The gearbox is then coupled to a doubly fed induction generator that creates magnetic field with two sets of electrically-excited windings. In this system there are no permanent magnets.


Pic.1: Conventional commercial-scale wind turbine.
1 - blade; 2 - hub; 3 - rotor bearing; 4 - gearbox; 5 - generator.

Under normal conditions, the typical rotor speed for a commercial-scale wind turbine locates between 10 and 20rpm, but the doubly fed induction generator requires much higher rpm (at least 750rpm) to operate properly. Therefore the gearbox is applied to convert the low speed of the rotor into the high speed needed by the generator. However, bigger gearboxes may bring more mechanical problems. According to a specific report in 2007, the majority of gearbox failures originate from the bearings. Without regular maintenance and observation, it doesn&rsquo;t need much time to learn how catastrophic a gearbox failure would be to the turbine system. Various improvements in design were made during recent years but none of them could completely resolve the problems without bring other ones. For this reason during a very long time the wind-electricity conversion rate stayed very low.

These challenges led to a re-think in the structure of the wind turbine power train and in 2005 came out the first commercially-available turbine generator solution.  This new design innovatively conjunct the gearbox with a permanent magnet generator and significantly increased the wind-electricity conversion rate and reliability of the system.

The new set-up reduced the overall weight in the nacelle and required a much lower generator speed of 60-150rpm compared with the doubly fed inductor generator design. In addition, the new design had fewer moving parts to go wrong and required less maintenance.

As you can guess, the following step would be to come up with a design that removes the need for a gearbox altogether, which is exactly the design we use today. The latest couple of years has witnessed the emergence of commercial-scale & direct drive permanent magnet generator systems with the hub directly connected to the generator. The benefit that we get is a system with significantly increased reliability and reduced maintenance costs. Reduced downtime for maintenance also means less non-producing time offline. The elimination of the inevitable associated mechanical losses for gearboxes also leads to improved efficiencies in the power conversion process. The generator itself is also much more robust than conventional systems, and compared to earlier designs, it gives greater efficiencies when wind speeds are not at full rating.



Material Grade of NdFeB magnet:
Magnet N-( N35, N38, N40, N42, N45, N48, N50),
Magnet M-(35M, 38M, 40M, 42M, 45M, 48M),
Magnet H-(35H, 38H, 40H, 42H, 45H),
Magnet SH-(30SH, 33SH, 35SH, 38SH, 40SH, 42SH),
Magnet UH-( 28UH, 30UH, 33UH, 35UH, 38UH),
Magnet EH-(28EH, 30EH, 30EH, 33EH, 35EH)

1) Application of NdFeB magnet: Toys, package, Printer, Switchboard, Phone, voice coil motors (VCM's) in hard disk drives, high performance motors, brushless DC motors, magnetic separation, magnetic resonance imaging, sensors, loudspeakers etc.

2) The coating of NdFeB magnets can be Zn, Ni, Ni-Cu-Ni, Epoxy, CR3+ZN, NI+AG, NI+AU.



3) Our factory can also manufacture various sizes of NdFeB magnet, according to the customer's specification.

Magnetic properties of Sintered NdFeB magnets:
Grade Remanence Coercive Force Intrinsic Coercive Force Max. energy product Max.
Operating
Temperature
Br Hcb Hcj (BH ) Tw
max  
mT kA/m kA/m kJ/m3
(kGs) (kOe) (kOe) (MGOe)
N35 1170-1220 >= 868 >=955 263-287 80 C
(11.7-12.2) ( >= 10.9) ( >= 12) (33-36)
N38 1220-1250 >=899 >=955 287-310 80 C
(12.2-12.5) ( >= 11.3) ( >= 12) (36-39)
N40 1250-1280 >= 907 >=955 302-326 80 C
(12.5-12.8) ( >= 11.4) ( >= 12) (38-41)
N42 1280-1320 >= 915 >=955 318-342 80 C
(12.8-13.2) ( >= 11.5) ( >= 12) (40-43)
N45 1320-1380 >= 923 >=955 342-366 80 C
(13.2-13.8) ( >= 11.6) ( >= 12) (43-46)
N48 1380-1420 >= 923 >=955 366-390 80 C
(13.8-14.2) ( >=11.6) ( >= 12) (46-49)
N50 1400-1450 >= 796 >=955 382-406 80 C
(14.0-14.5) ( >= 10.0) ( >= 12) (48-51)
N52 1430-1480 >= 796 >=955 398-422 80 C
(14.3-14.8) ( >= 10.0) ( >= 12) (50-53)
33M 1130-1170 >= 836 >= 1114 247-263 100 C
(11.3-11.7)   (>= 10.5) ( >= 14) (31-33)
35M 1170-1220 >= 868 >= 1114 263-287 100 C
(11.7-12.2) ( >= 10.9) ( >= 14)   (33-36)
38M 1220-1250 >= 899 >= 1114 287-310 100 C
(12.2-12.5) ( >= 11.3) ( >= 14) (36-39)
40M 1250-1280 >= 923 >= 1114 302-326 100 C
(12.5-12.8) ( >= 11.6) ( >= 14) (38-41)
42M 1280-1320 >= 955   >= 1114   318-342   100 C
(12.8-13.2) ( >= 12.0) ( >= 14) (40-43)
45M 1320-1380 >= 995 >= 1114 342-366 100 C
(13.2-13.8) ( >= 12.5) ( >= 14) (43-46)
48M 1360-1430 >= 1027 >= 1114 366-390 100 C
(13.6-14.3) ( >= 12.9) ( >= 14) (46-49)
50M 1400-1450 >= 1033 >= 1114 382-406 100 C
(14.0-14.5) ( >= 13.0) ( >= 14) (48-51)
35H 1170-1220 >= 868 >= 1353 263-287 120 C
(11.7-12.2) ( >= 10.9) ( >= 17) (33-36)
38H 1220-1250 >= 899 >= 1353 287-310 120 C
(12.2-12.5) ( >= 11.3) ( >= 17) (36-39)
40H 1250-1280 >= 923 >= 1353 302-326 120 C
(12.5-12.8) ( >= 11.6) ( >= 17) (38-41)
42H 1280-1320 >= 955 >= 1353 318-342 120 C
(12.8-13.2) ( >= 12.0) ( >= 17) (40-43)
45H 1320-1360 >= 963 >= 1353 326-358 120 C
(13.2-13.6) ( >= 12.1) ( >= 17) (43-46)
48H 1370-1430 >= 995 >= 1353 366-390 120 C
(13.7-14.3) ( >= 12.5) ( >= 17) (46-49)
35SH 1170-1220 >= 876 >= 1592 263-287 150 C
(11.7-12.2) ( >= 11.0) ( >= 20) (33-36)
38SH 1220-1250 >= 907 >= 1592 287-310 150 C
(12.2-12.5) ( >= 11.4) ( >= 20) (36-39)
40SH 1240-1280 >= 939 >= 1592 302-326 150 C
(12.5-12.8) ( >= 11.8) ( >= 20) (38-41)
42SH 1280-1320 >= 987 >= 1592 318-342 150 C
(12.8-13.2) ( >= 12.4) ( >= 20) (40-43)
45SH 1320-1380 >= 1003 >= 1592 342-366 150 C
(13.2-13.8) ( >= 12.6) ( >= 20) (43-46)
28UH 1020-1080 >= 764 >= 1990 207-231 180 C
(10.2-10.8) ( >= 9.6) ( >= 25) (26-29)
30UH 1080-1130 >= 812 >= 1990 223-247 180 C
(10.8-11.3) ( >= 10.2) ( >= 25) (28-31)
33UH 1130-1170 >= 852 >= 1990 247-271 180 C
(11.3-11.7) ( >= 10.7) ( >= 25) (31-34)
35UH 1180-1220 >= 860 >= 1990 263-287 180 C
(11.8-12.2) ( >= 10.8) ( >= 25) (33-36)
38UH 1220-1250 >= 876 >= 1990 287-310 180 C
(12.2-12.5) ( >= 11.0) ( >= 25) (36-39)
40UH 1240-1280 >= 899 >= 1990 302-326 180 C
(12.5-12.8) ( >=11.3) ( >= 25) (38-41)
28EH 1040-1090 >= 780 >= 2388 207-231 200 C
(10.4-10.9) ( >= 9.8) ( >= 30) (26-29)
30EH 1080-1130 >= 812 >= 2388 223-247 200 C
(10.8-11.3) ( >= 10.2) ( >= 30) (28-31)
33EH 1130-1170 >= 876 >= 2388 247-271 200 C
(11.3-11.7) ( >= 10.5) ( >= 30) (31-34)
35EH 1170-1220 >= 876 >= 2388 263-287 200 C
(11.7-12.2) ( >= 11.0) ( >= 30) (33-36)
38EH 1220-1250 >= 899 >= 2388 287-310 200 C
(12.2-12.5) ( >= 11.3) ( >= 30) (36-39)
28AH 1040-1090 >=787 >= 2624 207-231 230 C
(10.4-10.9) ( >= 9.9) ( >= 33) (26-29)
30AH (26-29) >=819 >= 2624 223-247 230 C
(10.8-11.3) ( >= 10.3) ( >= 33) (28-31)
33AH 1130-1170 >= 843 >= 2624 247-271 230 C
(11.3-11.7) (>= 10.6) ( >= 33) (31-34)
 

OTIS Moving Walkways Spare Parts

OTIS Moving Walkways 606 NCT

The sheer number of passengers a commercial Trav-O-Lator® carries, demands that safety has to be the overiding concern. In this respect the Otis 606 NCT's performance is unsurpassed. By way of example, tapered deflectors prevent objects from entering the handrail entry box (a design unique to OTIS). Trolleys can be transported in safety. And the balustrade, with an ideal 1000 mm height at landings, is constructed of 10 mm thick safety glass.

OTIS Moving Walkway Spare Parts, OTIS Moving Walkway Parts

CEP Elevator Products ( China ) Co., Ltd. , https://www.zjsmartcommercialescalators.com