Syntegra
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History and design
The motor design is a hermetically sealed 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.[1][3] 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.[3]
The bogie frame has a single central cross member which supports via pivots two longitudinal beams (in a 'weighing scale' arrangement) connected to the wheelset via the primary suspension.[3] The cross member supports the vehicle body via the secondary suspension of two outboard air springs.[1]
In mid-2006 prototype motors rated 110 kilowatts (150 hp), with claimed 96% efficiency, were fitted to an ex-Munich U-Bahn vehicle for testing at the Wegberg-Wildenrath test circuit.[4] In 2008 a train fitted with two Syntegra bogies began in-service tests on the Munich U-Bahn.[5]
A 150 kilowatts (200 hp) prototype was displayed at Innotrans (2009), the prototype bogie weight was 5.6 tonnes (5.5 long tons; 6.2 short tons), with a 1.6-metre (63-inch) wheelbase and a maximum axleload of 14 tonnes (14 long tons; 15 short tons).[1]
