PERMANENT MAGNET DIRECT DRIVE SUBWAY TRAIN

摘要

A permanent magnet direct drive subway train, comprising a train body, a frame mechanism (1) and wheelset mechanisms arranged below the train body. A permanent magnet synchronous traction motor (4) is embracingly installed on a wheel axle, both ends of a rotor (9) of the permanent magnet synchronous traction motor (4) being connected to a train axle (20), and the inside of a stator (10) of the permanent magnet synchronous traction motor (4) being connected to the frame mechanism (1) by means of an elastic support structure (5). An axle-control method is used on a traction system which matches the direct drive permanent magnet synchronous motor (4), and an isolation contactor is provided between each motor and a traction inverter. An axle-control method is used on a traction system which matches the direct drive permanent magnet synchronous motor; a control system does not restrict the differences of wheel diameters between axles during operation, greatly reducing the workload and maintenance costs for vehicle spinning wheels; provided between each motor and a traction inverter is an isolation contactor, in order to prevent the motor, after a failure thereof, from being converted to a generator, which interrupts the operations of the inverter, thus ensuring the safety of the traction system when the motor fails.