Induction motor controller

An induction motor controller, comprising:

• three phase paths leading from a power input to a power output;
• three switches interposed between the power input and the power output, each located on one of the three phase paths;
• voltage-sensing circuitry connected to the three phase paths between the switches and the power output and configured to measure voltages between phase path pairs;
• current-sensing circuitry connected to the phase paths and configured to measure current through the phase paths;
• and
• a processor communicatively coupled to the voltage-sensing circuitry, the current-sensing circuitry, and the switches, wherein the processor is configured to close one or more of the switches at a desired phase angle of a power supply coupled to the power input, and wherein the processor is configured to calculate a motor parameter based on a signal from the voltage-sensing circuitry and a signal from the current-sensing circuitry.

A motor controller, comprising:

• a first phase path having a first pair of oppositely-oriented SCRs;
• a second phase path having a second pair of oppositely-oriented SCRs;
• a current sensor on either the first phase path or the second phase path;
• a voltage sensor disposed between the first phase path and the second phase path, wherein the voltage sensor is configured to sense line-to-line voltage;
• and
• a processor coupled to the first pair of SCRs, the second pair of SCRs, the current sensor, and the voltage sensor, wherein the processor is configured to quantify a transient response of an induction motor by firing one SCR from the first pair of SCRs and one SCR from the second pair of SCRs.