RC08Brushless
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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.For the controller a special-purpose brushless motor driver IC was used. For information on the motors or motor control software please see their respective pages.
Contents
Tasks
- [ ] Get the motor and begin playing with it
- [ ] Call Maxon and get a recommendation on motor drivers
- [X] Figure out max current draw. (10A starting current)
- [ ] Finalize on a DSC
- [ ] Choose MOSFETS
- [ ] Sample all the parts
- [ ] Set-up test-circuit
- [ ] Prototype Circuit
- [ ] Build prototype
Specifications
Motor Controller Chip
- The motor is spec'd at 12V and is 30W
- A decent transient response (dead-time + switching time)
- 3-Channels in one package
- Braking is not a requirement but would be nice
- High Impedance OFF state
- Fault protection (overvoltage, overcurrent, fast response)
- Small package
- Ability to operate in the >20kHz range
- Gate drive capability (either can directly driver the gate or is open drain.)
- Data sheet recommends a MOSFET
- Matrix of Potential Drivers
MOSFET
- Depletion Mode
- Probably an NMOS and a PMOS
- The FETS have to be able to handle 10A drain current
- Matrix of Potential FETS
Schematics
Schematics
Parts
DSC
Quick Specs
Data Sheet
FETS
Quick Specs
Data Sheet
Articles
Links