Difference between revisions of "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. | + | 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. |
| − | == | + | ==Tasks== |
*[ ] Get the motor and begin playing with it | *[ ] Get the motor and begin playing with it | ||
**[ ] Call Maxon and get a recommendation on motor drivers | **[ ] Call Maxon and get a recommendation on motor drivers | ||
| − | **[ ] Figure out max current draw. ( | + | **[X] Figure out max current draw. (10A starting current) |
*[ ] Finalize on a DSC | *[ ] Finalize on a DSC | ||
*[ ] Choose MOSFETS | *[ ] Choose MOSFETS | ||
| Line 14: | Line 14: | ||
==Specifications== | ==Specifications== | ||
====Motor Controller Chip==== | ====Motor Controller Chip==== | ||
| − | * The motor is spec'd at 12V and is 30W | + | * The motor is spec'd at 12V and is 30W |
| − | * A decent transient response ( | + | * A decent transient response (dead-time + switching time) |
* 3-Channels in one package | * 3-Channels in one package | ||
| − | * Braking is not a requirement but would be nice | + | * Braking is not a requirement but would be nice |
* High Impedance OFF state | * High Impedance OFF state | ||
| + | * Fault protection (overvoltage, overcurrent, fast response) | ||
| + | * Small package | ||
* Ability to operate in the >20kHz range | * Ability to operate in the >20kHz range | ||
* Gate drive capability (either can directly driver the gate or is open drain.) | * Gate drive capability (either can directly driver the gate or is open drain.) | ||
* Data sheet recommends a MOSFET | * Data sheet recommends a MOSFET | ||
| + | * [[RC08BLDCMotorDrivers | Matrix of Potential Drivers]] | ||
| + | |||
====MOSFET==== | ====MOSFET==== | ||
* Depletion Mode | * Depletion Mode | ||
* Probably an NMOS and a PMOS | * Probably an NMOS and a PMOS | ||
| − | * | + | * The FETS have to be able to handle 10A drain current |
| − | + | * [[RC08MotorFETS | Matrix of Potential FETS]] | |
==Schematics== | ==Schematics== | ||
Schematics | Schematics | ||
==Parts== | ==Parts== | ||
====DSC==== | ====DSC==== | ||
| − | + | =====Quick Specs===== | |
| − | + | =====Data Sheet===== | |
| − | ==== | + | ====FETS==== |
| − | ==== | + | =====Quick Specs===== |
| − | ==== | + | =====Data Sheet===== |
Revision as of 12:02, 17 September 2007
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
