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The requirements on vehicle emission control are more and more demanding. In order to meet these emission control requirements, internal combustion engines need to be more and more efficient and so require new electronic engine management features. These innovative solutions on engine management are usually based on electrically actuated or regulated valves, pumps and turbines. We have developed Brushless DC (BLDC) actuator designs dedicated to high temperature engine environment on applications like Exhaust Gas Recirculation (EGR) valve or Variable Geometry Turbo (VGT). These actuators encompass a patented low cost design of BLDC motor, a reversible motion transformation, and a high temperature drive electronic. Additional optional features like fail-safe return spring, analog position sensor or clutch can also be added in the actuator.

Many synchronous electric motors require a very accurate position sensor compatible with a sinusoidal control. The purpose of such a control is to enable an efficient and smooth operation enhancing the comfort by limiting vibrations. In some cases related to mechanical constraints, we have to deal with through-shaft design. One can quote for examples power drives for Electric or Hybrid Electric Vehicles as well as for Electric Power Steering motor. More generally, these sensors need to keep a simple and robust design and a restricted number of parts as they are submitted to high vibration levels, a wide temperature range and speeds of several krpm. In order to meet such requirements, MMT has developed a magnetic sensor principle offering a competitive alternative to the conventional inductive resolver type sensors. The basics of this solution is a through shaft angular position sensor using one or two Hall-effect probes.