PMSM — fully enclosed permanent-magnet synchronous traction motors

Description

Permanent-magnet traction motors (PMSM) are synchronous machines for electric trains, metro and locomotives, produced serially since 2006 as an alternative to common asynchronous traction motors. Design and advantages. The permanent-magnet rotor has almost no excitation losses, so the motor efficiency reaches 97% (calculated from measured losses per IEC 60349-2). According to tests to JIS E6102, the PMSM system reduces electricity consumption by up to 39% compared with a conventional asynchronous drive, including improved regenerative braking. The motor is fully enclosed: dust and moisture do not enter, periodic disassembly and cleaning are unnecessary, and the risk of failures from insulation ageing and overheating caused by clogged ventilation is reduced. The bearing assembly is replaced without disassembling the machine. The noise is about 12 dB(A) lower than that of a self-ventilated asynchronous motor of the same class. The magnet is located inside the machine, and external magnetic flux leakage in normal operation is practically absent. The compact and light design allows the standard bogie to be used without changes. Range (per the manufacturer’s brochure): 120 kW for Tokyo Metro 1000 (615 kg, Ø540 × 510 mm); 205 kW for Tokyo Metro 16000 (560 kg, Ø600 × 496 mm); 140–150 kW for the Busan Metro (Line 1); 190 kW for Tobu 500; 135 kW for Singapore C151. For HXD3 electric locomotives (China) the manufacturer supplied PMSM equipment for a locomotive power of 7,200 kW. Control: vector, sensorless; the motors work in pairs with VVVF inverters, including compact “4-in-1” units. Applications: metro, suburban and main-line electric trains, hybrid locomotives, and modernization of rolling stock with asynchronous drive. Traction motors are produced at the Fuchu complex (Tokyo) and at a joint venture in China.

Technical specifications