AC induction machines are popular due to their simplicity, reliability, and direct operation from an AC line voltage. ACIMs are asynchronous machines and always have a lower mechanical rotor speed than the power line frequency.
The principle of operation for an ACIM is based on the voltage induction from the stator to the rotor. When the stator winding is fed by a three-phase supply voltage, the current flows in the winding and the stator rotating magnetic field is generated. Induced voltage in the rotor windings will create the rotor current and the rotor magnetic field. The interaction between two magnetic fields creates the mechanical torque needed to turn the rotor.
Explore the MC34937, an industrial-grade 3-phase gate pre-driver for BLDC and PMSM motor control. The MC34937 can support 12V, 24V, and 36V motor control applications and easily interfaces to standard MCUs and DSPs.
AN3729: This application note deals with the correct usage of FlexTimer, a new NXP timer module, in ACIM/PMSM motor control applications. Motor control applications place specific demands on timer modules with regard to signal consistency, the safety of complementary signal generation, and the handling of application fault conditions.
There are embedded applications that require several modules to work together in specific order and with precise timing. If timing requirements are too strict for software to be able to fulfill them, then hardware synchronization is needed to ensure the correct execution of an application. This application note describes the hardware synchronization and trigger capability of the FlexTimer module (FTM) for applications that benefit from the use of that module, for better or more precise operation.