PMSM Overview

Toshiba started developing the PMSM system in the early 1990s. Utilising data accumulated through R&D and field tests, Toshiba established the PMSM main circuit system technologies for railway cars.

The most strong point of PMSM system is High efficiency. There is no secondary copper loss, decreased primary copper loss, iron loss and others. Overall loss, drastically reduced to less than 50% compared to induction motor.

Key Features

Energy Efficiency
Reliable
Low Noise
Easy Maintenance

Key Benefits

High
Efficiency
97
%*1
* 1The motor efficiencies were calculated with loss measurement based on IEC 60349-2 at the temperature below 40°C from 8/25/2009 to 9/25/2009 for PMSM.
Saving
Energy
39
%*2

* 2This graph compares the energy consumption measurement result on the following condition.

Trains used:
C151 PMSM train: EMU131/132 of SMRT fleet which equips PMSM propulsion system
C151 Existing train: EMU 109/110 of SMRT fleet which equips DC motor propulsion system
Duration: 7th Dec 2015 to 11th Dec 2015 (Total 5 weekdays)
Running pattern: These 2 trains were used in commercial operation and they run in a series as possible as diagram allows.

Service
Up Time
100
%
C151 PMSM Train Running Mileage
Since the introduction of C151 PMSM prototype train (2 train-sets) in August 2015, C151 PMSM trains (total 6 train-sets) keep to run with no service disputation disruption.
The running period of each train is from the first day of revenue service to 01 April 2018.
Easy
Maintenance
2018