Inverter Drive
what is sensor-less vector control ?
Frequency Inverter drives.
Sensorless vector control is a variable frequency drive (VFD) control strategy that improves motor performance by regulating the VFD output based on a mathematical determination of motor characteristics and operating conditions. Operating conditions are estimated from measurements of electrical parameters. Sensorless vector control is called “sensorless” to distinguish it from vector control with encoder feedback which optimizes motor performance by regulating the VFD output based on motor shaft speed and position feedback from an encoder.
Both types of vector control provide improved performance over the basic control strategy called “V/Hz control” or “scalar control.” With the simplest type of V/Hz, control, the drive simply acts as a power supply that provides an adjustable output frequency with output voltage proportional to frequency. To provide the maximum possible motor torque with the minimum possible current, the motor voltage needs to be “fine tuned” to suit the exact motor characteristics and to compensate for changes in those characteristics due to load changes and motor temperature changes. To more closely regulate motor speed, the motor frequency needs to be “fine tuned” as well. Various vector control strategies are used to accomplish this.
5v – 12v / 5 – 30 watt CFL Inverter Driver Circuit
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