Download Motor Hardware

MOTOR HARDWARE
BREAKDOWN
Lianna Dicke
Design Goals:
• Drive DC motor that draws 5 A maximum continuous current
• Voltage operation at 12 Volts (automotive)
• Low cost
• Possibility of being driven in both directions
• Commands will come from Teensy 3.1 controller
• Commands will include PWM and direction control
Due to a major design scope change (new actuator), a detailed schematic is not included in this documentation
High Level Block Diagram
Teensy 3.1
POSITION
SENSOR
Commands
DRV8701: Gate Driver
H-BRIDGE
MOTOR
This is a high level diagram of the functionality of the motor driver hardware
(Provided by Texas Instruments)
Reverse Supply Protection: if hooked up backwards, there
will not be any current going through the H-Bridge
DRV8701
H-Bridge to Motor Connections: connected to four NMOS power
transistors, which are capable to handle 5A
Speed Sensor: indicates how much current is going through
H-Bridge Directional Flow
Texas Instrument Gate Driver Chip: DRV8701
The internals of the chip
Power Generation: Control Logic Power
H-Bridge to Motor Connections:
Power Stage
Inputs from Teensy 3.1
Differential Amplifier: reads out a voltage
due to Rsense and feedbacks to Outputs
and Logic that controls the Gates
Outputs for Teensy 3.1: Open Collector
Layout Design Goal (Provided by TI)
Land Pattern Data : (Footprint)
Recommendation from TI:
Add thermal pad under IC; add vias to distribute
thermal energy
Hardware Implementation: Prototype
https://www.pololu.com/picture/view/0J6859