MSYS

Background

The MSYS transmission allows the motor to be smaller and more efficient by running it in a more power efficient regime of the electric motor. For single speed drives the motors must have a high speed range in order to allow low speed manoeuvring and high speed highway cruising. This requires the motors to run at high speeds. In order to make a motor run at high speed you need to overcome the resistance of the magnetic field by weakening the field. This field weakening requires additional power and larger inefficient power electronics.

A multi-speed transmission makes sense as it allows the motor to run at lower speed eliminating the field weakening power loss (worth 10-15% reduction in power consumption) but also allowing the power electronics and motor to be smaller and lower cost. The problem with multi-speed system is changing gear automatically without affecting passenger comfort (i.e. seamless power shift) or using power to hold in gear (all automatic transmission use power to hold clutches closed). The MSYS shift technology gives the best of both worlds providing a seamless shift but without requiring power to hold in gear as the system latches once the shift is completed.

The technology is primarily aimed at the electric vehicle market and in particular both battery electric vehicles (BEV) and plug-in hybrid electric vehicles (PHEV). These will provide the largest total market. Within this market however the premium manufacturers are the most immediately attractive as they provide a higher product desire and this can address the higher prices that electric vehicles are sold for when compared to conventional vehicles.