Variable frequency drive synchronous reluctance motor system with volts-per-Hertz control

A variable frequency drive motor system comprising:

• a plurality of synchronous reluctance motors, each synchronous reluctance motor including a stator and a rotor, and each rotor including—
• a longitudinal axis and four quadrants circumferentially arranged about the longitudinal axis, and
• a plurality of curved, spaced-apart barrier slots contained within each quadrant and extending parallel to the longitudinal axis, and
• a conductive cage including—
• a conductive material located in at least some of the plurality of curved, spaced-apart barrier slots to create at least three curved, spaced-apart conductive rotor bars contained within each quadrant and extending parallel to the longitudinal between a first end and a second end, and
• first and second conductive end rings located at longitudinally opposite ends of the rotor, with the first conductive end ring in electrical contact with the first end of the at least three curved, spaced-apart conductive rotor bars and the second conductive end ring in electrical contact with the second end of the at least three curved, spaced-apart conductive rotor bars;
• and
• a variable frequency drive controller including an inverter and configured to control a motor speed and a motor torque of each of the synchronous reluctance motors by varying a motor input frequency and a voltage in an open-loop mode by adjusting the voltage magnitude of an output of the inverter to each synchronous reluctance motor to match a required load torque in a volts-per-Hertz relationship.

A variable frequency drive motor system comprising:

• a plurality of synchronous reluctance motors, each synchronous reluctance motor including a stator and a rotor, and each rotor including—
• a longitudinal axis and four quadrants circumferentially arranged about the longitudinal axis,
• a plurality of curved, spaced-apart barrier slots contained within each quadrant and extending parallel to the longitudinal axis, and
• a conductive cage including—
• a conductive material located in at least some of the plurality of curved, spaced-apart barrier slots to create a plurality of curved, spaced-apart conductive rotor bars contained within each quadrant and extending parallel to the longitudinal axis between a first end and a second end, and
• first and second conductive end rings located at longitudinally opposite ends of rotor, with the first conductive end ring in electrical contact with the first end of the plurality of curved, spaced-apart conductive rotor bars and the second conductive end ring in electrical contact with the second end of the plurality of curved spaced-apart conductive rotor bars,
• wherein there are between three and seven curved, spaced-apart conductive rotor bars in each quadrant;
• a single variable frequency drive controller including an inverter and configured to control a motor speed and a motor torque of each of the synchronous reluctance motors by varying a motor input frequency and a voltage in an open-loop mode by adjusting the voltage magnitude of an output of the inverter to each synchronous reluctance motor to match a required load torque in a volts-per-Hertz relationship;
• and
• an operator interface configured to facilitate an operator starting, stopping, and adjusting the motor speed of each synchronous reluctance motor.