3-phase Ac Induction Vector Control Drive With Single Shunt Current Sensing

 This paper describes the design of a direct vector control algorithm for a three-phase AC induction drive
based on Freescale’s MC56F8013 MC56F8023 dedicated Motor Control devices.
Three-phase AC induction motors (ACIM) are popular in industry for a number of reasons. Their
construction is extremely optimized, since they have been produced for years. They are very simple and
manufacturing costs are favorable. They have no brushes and require minimum maintenance. The
robustness of the motor is another strong advantage. We would find induction motors mostly in
applications such as water pumps, compressors, fans and air-conditioning systems.
In order to achieve variable speed operations in a three-phase AC induction motor, a variable voltage and
variable frequency needs to be supplied to the motor. Modern three-phase variable speed drives (VSD)
are supplied with digitally controlled switching inverters.
The control algorithms CAN be sorted into two general groups. The first group is referred to scalar control.
The constant Volt per Hertz control is a very popular technique representing scalar control. The other
group is called vector or field oriented control (FOC). The vector oriented techniques brings overall
improvements in drive performance over scalar control. Let’s mention the higher efficiency, full torque
control, decoupled control of flux and torque, improved dynamics, etc.
The reference design deals with the design of a vectors control algorithm for a three-phase AC induction
motor implemented on Freescale Semiconductor digital signal controllers MC56F8013/MC56F8023. The
presented design is targeted mainly at consumer and industrial applications. This cost-effective solution
and high reliability were two key requirements considered. Minimizing system cost the algorithm
implements a single-shunt current sensing eliminating three Current Sensors to one. The high range of
motor operating speeds up to 18000RPM is another advantage of the presented design. An adaptive
closed loop rotor flux estimator enhances control performance and increases the overall robustness of
the system. Sensitivity of the parameter drift CAN be considerably minimized in this way.
The reference design manual describes basic motor theory, the system design concept, hardware
implementation, and the software design, including the FreeMASTER software visualization tool.
application notes                    New application notes
Download application notes and circuits


3-phase Ac Induction Vector Control Drive With Single Shunt Current Sensing application circuits
3-phase Ac Induction Vector Control Drive
With Single Shunt Current Sensing application circuits

3-phase Ac Induction Vector Control Drive With Single Shunt Current Sensing application circuits
3-phase Ac Induction Vector Control Drive
With Single Shunt Current Sensing application circuits


Related Electronics Part Number
Hot categories