Motorola Corporation

Radim Visinka

Leos Chalupa

Ivo Vecera

Pavel Lajsner

A method to control a switched reluctance motor (SRM) with a first phase ( ) and a second phase ( ) comprises: aligning the rotor with the second phase ( ); at a first time point (t ), energizing the first phase ( ) with a phase voltage that is substantially constant; monitoring an increase of the phase current (I ) in the first phase ( ) until the phase current reaches a maximum ( ); monitoring a decrease ( ) of the first current (I ) until at a second time point (t ) the phase current (I ) reaches a minimum ( ) and starts to increase again ( ); de-energizing the first phase ( ) at a third time point (t ) that follows the second time point at (t ) at a predetermined time interval; and repeating energizing, monitoring and de-energizing for the second phase ( ) instead of the first phase ( ).

Method for controlling switched reluctance motor, and controller

A controller ( ) which estimates the coil resistance (R) of an electric motor ( ), receives representations of a voltage (u(t)) across a stator coil ( ) and of a current (i(t)) through the coil ( ). At first, the controller ( ) estimates the magnetic flux ( (t )) in the coil by integrating the difference between u(t) and the product between the current with a preliminary resistance ( ) over a predetermined time interval (t , t ) in which the coil ( ) is energized. Second, the controller ( ) calculates a resistance error ( R) using a known actual flux value (t ) at the end (t ) of the time interval, the previously estimated magnetic flux (t ) and the integral of the current over the time interval. Third, the calculator derives the coil resistance (R) from the preliminary resistance ( ) and the resistance error ( R).

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Roznov, Czechia

Radim Visinka