SR technology
The Switched Reluctance (SR) motor is used in the Emotron EMX drive system dedicated for driving rotary heat exchangers. Emotron holds several patents of how to design, control and monitor the SR motor. The first Emotron EMX Drive system was launched 1984.
How does it work?
The operation of SR motors is based on the principle that an iron core will align itself in the ”minimum reluctance” position when a magnetic field is applied to it. SR motors have built-in salient poles on both the rotor and the stator, with the stator poles carrying electrical windings which are arranged into phases.
Because the SR motor is electronically commutated, the voltage supplied is switched sequentially between the different phases by the control unit. Nevertheless, the SR motor should not be regarded as a stepping motor because the current supply is controlled in relation to the angular position of the rotor, which has to be continuously monitored.
Emotron’s INTRASENS™ system makes it possible to use sensorless motors because the rotor’s position is monitored by the control unit.