Lianna Dicke MOTOR HARDWARE BREAKDOWN. Design Goals: Drive DC motor that draws 5 A maximum...
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Transcript of Lianna Dicke MOTOR HARDWARE BREAKDOWN. Design Goals: Drive DC motor that draws 5 A maximum...
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Lianna Dicke
MOTOR HARDWAREBREAKDOWN
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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
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DRV8701: Gate Driver
Teensy 3.1
CommandsH-BRIDGE MOTOR
POSITION SENSOR
High Level Block Diagram
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This is a high level diagram of the functionality of the motor driver hardware(Provided by Texas Instruments)
H-Bridge to Motor Connections: connected to four NMOS power transistors, which are capable to handle 5A
Reverse Supply Protection: if hooked up backwards, there will not be any current going through the H-Bridge
DRV8701
Speed Sensor: indicates how much current is going through
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H-Bridge Directional Flow
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Texas Instrument Gate Driver Chip: DRV8701The internals of the chip
Inputs from Teensy 3.1
Outputs for Teensy 3.1: Open Collector
H-Bridge to Motor Connections:Power Stage
Power Generation: Control Logic Power
Differential Amplifier: reads out a voltage due to Rsense and feedbacks to Outputs and Logic that controls the Gates
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Layout Design Goal (Provided by TI)
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Land Pattern Data : (Footprint)
Recommendation from TI:Add thermal pad under IC; add vias to distribute thermal energy
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Hardware Implementation: Prototype
https://www.pololu.com/picture/view/0J6859