3-Phase Switched Reluctance (SR) Sensorless Motor Control Using a 56F80x, 56F8100 or 56F8300 Device
This Application Note describes the design of a sensorless 3-Phase Switched Reluctance (SR) motor drive based on Freescale’s 56F80x / 56F8300 dedicated motor control devices. SR motors are gaining wider popularity among variable-speed drives due to their simple, low-cost construction characterized by an absence of magnets and rotor winding, high level of performance over a wide range of speeds, and fault-tolerant power stage design.
Design of a Motor Control Application
This application involves a sensorless speed closed-loop SR drive with an inner current loop using flux linkage position estimation. The change in phase resistance during motor operation due to its temperature dependency creates errors in the position estimation and significantly affects the performance of the drive. Therefore, a novel algorithm for on-the-fly estimation of phase resistance is included.
This application demonstrates the sensorless SR motor drive and serves as an example of a system design using a Advantages and Features of Freescale’s Hybrid Controller Freescale hybrid controller with PE support. It also illustrates the use of dedicated motor control libraries included in PE. The application helps start the development of the sensorless SR drive dedicated to the targeted application. This application note includes a description of the Freescale hybrid controller’s features, basic SR motor theory, system design concept, hardware implementation, and software design including the use of the PC master software visualization tool.
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