Syntegra is a

bogie A bogie ( ) (in some senses called a truck in North American English) is a chassis or framework that carries a wheelset, attached to a vehicle—a modular subassembly of wheels and axles. Bogies take various forms in various modes of transp ...

developed by

Siemens Siemens AG ( ) is a German multinational conglomerate corporation and the largest industrial manufacturing company in Europe headquartered in Munich with branch offices abroad. The principal divisions of the corporation are ''Industry'', '' ...

incorporating an axle mounted gearless electric drive in an inboard bogie. The design was unveiled at Innotrans in 2006, and began service trials in 2008 on the

Munich U-Bahn The Munich U-Bahn (german: U-Bahn München) is an electric rail rapid transit network in Munich, Germany. The system began operation in 1971, and is operated by the municipally owned Münchner Verkehrsgesellschaft (MVG; Munich Transport Company) ...

History and design

The motor design is a

hermetically sealed A hermetic seal is any type of sealing that makes a given object airtight (preventing the passage of air, oxygen, or other gases). The term originally applied to airtight glass containers, but as technology advanced it applied to a larger categor ...

simple co-axial gearless synchronous motor (a permanent magnet, three phase drive, passively cooled design); the motors can also be used for electrical dynamic braking, and also as an active electric brake. The wheelset bearings are mounted inboard and support both motor, axles and wheel. A traction link from motor to the vehicle frame transmits tractive forces. The bogie frame has a single central cross member which supports via pivots two longitudinal beams (in a '

weighing scale A scale or balance is a device used to measure weight or mass. These are also known as mass scales, weight scales, mass balances, and weight balances. The traditional scale consists of two plates or bowls suspended at equal distances from a ...

' arrangement) connected to the wheelset via the primary suspension. The cross member supports the vehicle body via the secondary suspension of two outboard air springs. In mid-2006 prototype motors rated , with claimed 96% efficiency, were fitted to an ex-

vehicle for testing at the Wegberg-Wildenrath test circuit. In 2008 a train fitted with two Syntegra bogies began in-service tests on the Munich U-Bahn. A prototype was displayed at Innotrans (2009), the prototype bogie weight was , with a wheelbase and a maximum axleload of .

History and design

References

Literature

External links