Motor module targets fly-by-wire

Oct. 26, 2006
A new hybrid motor controller is said to drastically simplify the certification process for motorpowered subsystems on modern airplanes.

The controller, dubbed the IRMCT3UF1 iMotion Motor Drive, contains motion-control algorithms embedded in an ASIC and, thus, reduces motor commissioning to simple selections that designers make from a menu, according to the developer International Rectifier, El Segundo, Calif.

The HiRel hybrid controller targets electrohydrostatic actuators that are replacing hydraulics in aircraft. It is optimized to handle brushless-dc motors that are increasingly specified for such uses because of their small size and weight/power qualities.

The unit performs closed-loop speed and torque control without the use of sensors for motor commutation. It calculates rotor position every 11 sec using bus voltage and phase currents. It handles BLDC motors up to 500 W and supplies 15-A rms. This makes the device a candidate for controlling 70% of all motors used in aircraft actuation tasks, according to IR.

The module combines a digital controller, memory, external interface, gate drivers, and six power MOSFETs into a package about 8-in. square. IR says it is also expected to find use in applications such as UAVs, mobile robotics, and military land vehicles.

International Rectifier,

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