What is vector control in electrical drives?
Vector control, also called field-oriented control (FOC), is a variable-frequency drive (VFD) control method in which the stator currents of a three-phase AC or brushless DC electric motor are identified as two orthogonal components that can be visualized with a vector.
What is scalar and vector control in VFD?
A scalar is a quantity that has only magnitude, such as mass or temperature. A vector is a quantity that has both magnitude and direction, such as acceleration or force. In a VFD, AC power is converted to DC through the rectifier. The rectified power is then filtered and stored in the DC bus (link).
What is a flux vector drive?
The flux vector control retains the volts/hertz core and adds additional blocks around the core to improve the performance of the drive. A “current resolver” attempts to identify the flux and torque producing currents in the motor and makes these values available to other blocks in the drive.
What are vector motors?
Inverter/Vector Duty motors designed specifically for variable speed control. They are designed to handle the additional heat generated when running at lower speeds. Vector Duty motors typically provide continuous constant torque performance across the entire speed range from zero speed to base speed.
What is a sensorless vector drive?
Sensorless vector control is a flux vector control where the amplitude, frequency, and phase of the AC voltage supply to the motor is varied to keep the motor speed as desired.
What do you mean by vector control?
Vector control aims to limit the transmission of pathogens by reducing or eliminating human contact with the vector. A wide range of vector control tools exist, which can be broadly classified into chemical- and non–chemical-based tools (Table 2).
What is torque control in VFD?
Torque control mode allows for the VFD to directly control motor torque instead of motor speed. This is necessary for any application where torque takes priority over speed. Winder, rewinders, capping, and web applications are some good examples of when torque control is utilized.
How are vectors controlled?
Methods of vector control include the elimination or management of larval habitats, larviciding with insecticides, the use of biological agents and the application of adulticides.
What is Torque Control in VFD?
Why is it called vector control?
Vector control is any method to limit or eradicate the mammals, birds, insects or other arthropods (here collectively called “vectors”) which transmit disease pathogens. The most frequent type of vector control is mosquito control using a variety of strategies.
Is DTC a vector control?
High-performance AC drives from ABB offer an innovative technology called direct torque control (DTC). As the name suggests, the method controls motor flux and torque directly, instead of trying to control motor currents indirectly like AC vector drives and DC drives.
Is torque a vector or scalar?
Unit of torque is Newton–meter (N-m). The above equation can be represented as the vector product of force and position vector. So as it is a vector product hence torque also must be a vector. Using vector product notations we can find the direction of torque.
What is a vector drive?
A vector drive uses a mathematical model of the motor to calculate and control the rotor flux position and magnitude based on stator currents and (often) motor shaft position. RE: What is a Vector Drive? OK, jraef.
How is torque represented mathematically?
So, mathematically torque is represented as: The unit of torque is Newton–meter (N-m). The above equation can be represented as the vector product of force and position vector.
Why can’t I do torque control with a scalar drive?
If for example it provides 43Hz to the motor, and the motor spins at a speed equivalent to 40Hz, the Scalar Drive doesn’t know. You can’t do true torque control with a scalar drive because it has no way of knowing what the motor output torque is (beyond an educated guess).