RC08Brushless

In 2008 RoboCup switched to brushless DC motors. While brushless motors are smaller and far more efficient than brushed motors the commutation normally performed inside a brushed DC motor will need to be done externally using some control circuitry. There are two main parts to our brushless motor controller solution; the controller which uses sensors on the motor to gate signals to one of three coils, and the half-bridge motor drivers which actually drive the coils. There are two design paths: one with a special purpose controller, and one with a CPLD as the controller. On this page you will find information about both. For information on the motors or motor control software please see their respective pages.

Task

• [ ] Finalize on a DSC
• [ ] Choose Half-Bridge Drivers
• [ ] Set-up test-bed
• [ ] Build prototype system
• [ ] Choose CPLD
• [ ] Choose MOSFET Drivers
• [ ] Build 2nd prototype
• [ ] Choose final solution

Specifications

• We are using the same batteries so it has to be a 9V system
• A decent transient response (This will be a function of hardware and software)
• 6 MOSFETs per motor and the ability to control each
• Braking is not a requirement but would be nice (We could just as easily do it software)
• High Impedance OFF state
• Ability to operate in the >20kHz

Schematics

Schematics

Links

• Electrical System