One-time registration is required to download the Reference designs and cores. There are different methods of controlling a BLDC motor. Implementation of FOC needs precise rotor position information. Sensors can be mounted on the rotor or within the motor to sense rotor position.
But using a position sensor is not feasible for applications that demand high reliability or high speed or where size and cost are constraints. The reference design provides a sensor-less algorithm where a back-emf based estimator is used to estimate rotor position based on a mathematical model of the motor.
Stepper motors are used for position control and are designed to operate in open loop without position feedback. Their inherent stepping ability allows for accurate positioning without feedback. A stepper moor can be controlled through a series of alternate pulses on stepper motor coils. But such a method will result in poor efficiency and torque ripple that generates noise. Increasing the number of micro-steps improves the performance.
The reference design can generate up to micro-steps and uses the principle of vector control. Rotor position sensors are mandatory in applications that demand full torque at the time of starting and at low speeds. Quadrature encoder is the widely used sensor to sense rotor position with high resolution and low cost.
The encoder interface algorithm in the IP converts the signals from encoder into angle and speed that can be used for FOC. The angle is incremented at each transition of the encoder signals through an interrupt. An encoder with high resolution generates interrupts at a faster rate. Click here to download Encrypted Reference Design Size of the design:. The HALL sensors are generally used for block commutation and are not directly suitable for FOC because of their poor resolution 60 0 electrical.
As HALL sensors provide absolute position information, the motor can be operated at full torque at the time of starting and at low speeds. AC Induction motors are used in many industrial and consumer applications. The three-phase induction motors are increasingly used in industrial aplications like variable-frequency drives.
Microsemi's induction motor design supports both varaiable-frequency and current control mode. Click here to download Encrypted Reference Design.
For motor control applications where reliability is a crucial factor and need to use a sensor to generate high torque at low speeds and stand still, the conventional optical encoder and magnetic HALL sensors are not suitable. These sensors are susceptible to temperature, external magnetic field, dirt and other environmental conditions. Resolver sensor is immune to such conditions and operate in harsh environments. A resolver is an inductive sensor that contains a rotor and one primary and two secondary windings that are stationary.
The primary winding is excited with a high frequency voltage. A voltage is induced in the secondary windings that is a sine and cosine function of rotor angular position. The device that excites the primary winding and demodulates the measured secondary voltages into angular position is called Resolver to Digital Converter RDC. The reference design integrates the functionality of an RDC along with Field oriented Control FOC to provide an complete resolver based motor control solution.
It needs an external hardware to interface resolver using J25 connector on the starter kit. Our website uses cookies including profiling cookies of authorised third parties to give you a better browsing experience, and by continuing to use our site you accept our cookies policy.
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A significant increase in energy efficiency was one of their goals. Motor Controls Torrent Engineering and Equipment applies the latest technologies to provide the best performance in motor control systems.
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