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“ Minimization and Enhancement of BLDC actuators for applications on Mechanical Systems by implementing Mechanical Field Weakening method ”
Abstract
In the design of actuators, there are many elements that must be considered to achieve a constant performance or to match a required specification. For example, we can take an electrical motor as an example, where elements such as magnet strength, coil winding scheme, mechanical design and many other aspects can be considered. We can surely design a motor to match certain specifications but applying a passive design to the motor will limit the engineer to choose which performance should be enhanced and consider the trade-offs between the choices. In our study, we are trying to apply a method called field weakening to overcome the problem related to the choice of performance.
Given a constant power input, the motor has limitations in running due to RPM limits and maximum current load. There are several reasons to this problem, but one of the biggest causes is the back EMF generated by the permanent magnets. Current study concentrates on the electrical method regarding the field-oriented control to reduce the back EMF, but our team is focused on the mechanical method of field weakening. Electrical method has its advantages like simple mechanical systems, but there are limitations where the efficiency tends to drop over certain high RPM ranges. On the other hand, current mechanical field weakening methods have its own problems due to bulky actuators limiting the application range of the field weakening. Thus, our objective is to develop a minimized BLDC actuator that implements mechanical field weakening and this goal will be achieved by implementing a mechanism design that is integrated into the actuator, so that it can change the airgap between the coils and the magnets to achieve field weakening.
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