Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation

Classification Context

Section:

ELECTRICITY

Class:

GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER

Subclass:

CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

Scope Notes

Glossary: Vector control Vector control is a method of controlling the speed of a three phase AC motor by varying its power supply in accordance with a mathematical model of the machine flux. Stator currents are measured and transformed into a complex current space vector, allowing control of flux and torque. The vector components are then transformed to a rotating coordinate system and voltages calculated in this system are generated by an inverter and applied to the motor.

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• H02P 21/02 specially adapted for optimising the efficiency at low load
• H02P 21/04 specially adapted for very low speeds
• H02P 21/05 specially adapted for damping motor oscillations, e.g. for reducing hunting
• H02P 21/06 Rotor flux based control involving the use of rotor position or rotor speed sensors
• H02P 21/12 Stator flux based control involving the use of rotor position or rotor speed sensors
• H02P 21/13 Observer control, e.g. using Luenberger observers or Kalman filters
• H02P 21/14 Estimation or adaptation of machine parameters, e.g. flux, current or voltage
• H02P 21/22 Current control, e.g. using a current control loop
• H02P 21/24 Vector control not involving the use of rotor position or rotor speed sensors
• H02P 21/34 Arrangements for starting
• H02P 21/36 Arrangements for braking or slowing; Four quadrant control