Method for reliable control of high rotor pole switched reluctance machine

A method for reliable control of a high rotor pole switched reluctance machine (HRSRM) utilizing a sensorless reliable control system, the HRSRM including a rotor and a stator with a plurality of stator phases each having a winding, the method comprising the steps of:

• energizing at least one of the plurality of stator phases at a stator phase energizing module;
• measuring a current value through the at least one energized stator phase and time taken by the current value to reach a peak value or preset magnitude of current at a current and time measuring module, wherein each of the windings of the rest of the plurality of stator phases is in an open circuit state;
• determining a self-inductance value for the at least one energized stator phase;
• measuring a voltage value across an adjacent un-energized stator phase and time taken by the current value through the at least one energized stator phase to reach a peak value or present magnitude of current, wherein the winding of the adjacent un-energized stator phase is in an open circuit state;
• determining a mutual inductance value between the at least one energized stator phase and the adjacent un-energized stator phase;
• estimating a rotor position utilizing a hybrid combination of the stored self-inductance and mutual inductance values at a rotor position estimation module;
• and
• controlling the HRSRM based on the estimated rotor position at a control module.

A sensorless reliable control system for a high rotor pole switched reluctance machine (HRSRM) comprising:

• a stator phase energizing module to excite at least one of a plurality of stator phases each having a winding;
• a current and time measuring module to measure a first current value through the at least one energized stator phase and time taken by the first current value to reach a pre-determined first peak value of current, wherein each of the windings of the rest of the plurality of stator phases is in an open circuit state;
• a self-inductance determining module to determine a self-inductance value for the at least one energized stator phase;
• a current and time measuring module to measure a second current value through an adjacent un-energized stator phase and time taken by the adjacent un-energized stator phase to reach a second peak value of current, wherein the winding of the adjacent un-energized stator phase is in a short circuit state;
• a mutual-inductance determining module to determine a mutual inductance value between the at least one energized stator phase and the adjacent un-energized stator phase;
• a rotor position estimation module to estimate a rotor position utilizing the stored self-inductance and mutual inductance values;
• and
• a control module to control the HRSRM based on the estimated rotor position.

A sensorless reliable control system for a high rotor pole switched reluctance machine (HRSRM), comprising:

• a stator phase energizing module to excite at least one of a plurality of stator phases each having a winding;
• a first current and time measuring module to measure a first current value through the at least one energized stator phase and time taken by the first current value to reach a preset threshold of current, wherein each of the windings of the rest of the plurality of stator phases is in an open circuit state;
• a self-inductance determining module to determine a self-inductance value for the at least one energized stator phase;
• a voltage and time measuring module to measure a voltage value across an adjacent un-energized stator phase and time taken by a second current value through the at least one energized stator phase to reach a peak value or present magnitude of current, wherein the winding of the adjacent un-energized stator phase is in an open circuit state;
• a mutual-inductance determining module to determine a mutual inductance value between the at least one energized stator phase and the adjacent un-energized stator phase;
• a rotor position estimation module to estimate a rotor position utilizing the stored self-inductance and mutual inductance values;
• and
• a control module to control the HRSRM based on the estimated rotor position.