From the web site : www.sevcon.com
The Gen4 DC sets a new standard in DC brushed motor controller performance and reliability. The Gen4 DC is compatible with a wide range of motors, including Separately Excited Motor ( SEM), Permanent Magnet brushed motors and Series wound motors. The Gen4 can be configured to accurately drive the motor in current control mode, offering a real and precise torque control of the motor. Speed control is also available. All types of motor are driven via four-quadrant armature control, resulting in immediate delivery of motor torque and enhanced fault protection of the system. Integrated logic circuitry and vehicle control functionality means that VCU functionality can be configured within the Gen4 DC unit.
Sevcon Gen4 DC - A new standard in DC brushed motor controller