RCmotor

From GT RoboJackets

An H-bridge MOSFET motor driver will be used to drive the motors. The driver will recieve a PWM signal from the mirco along with a reverse on/off signal. The driver provides the isolation, amplification, and drive current for the motor. The micro will be able to read MOSFET temp, drive current, and fault status from the driver. The driver will have overcurrent protection built in. There is also the possibility of using brush-less motors and set of MOSFET drivers. Both solutions will be researched.

Contents 1 The Wall 2 To Do 3 Specs 4 Schematics 5 BLDC Controllers 5.1 DSC Digital Signal Controllers 5.2 Micros 5.3 Specialty Controllers 5.4 FPGAs 6 Motor Drivers 6.1 Connectors (Drivers to Motors) 7 Articles 7.1 DC Motors in General 7.2 Brushless Motor Control 8 Links

The Wall

I think the one from ON is the one we should use. We can sample it in from ON --Phillp 18:46, 28 May 2006 (EDT)
Looks nice, almost perfect! If it could do lower then 7V... --Andy 10:44, 31 May 2006 (EDT)
Lower than 7V? What kinda motors are we going to use? There are some low voltage drivers out there but I only looked for 12V 1A --Phillp 18:46, 01 June 2006 (EDT)

• Going with 9V 3A drivers for Brushed DC --Phillp

To Do

• Determine what motor to use --ME has chosen Maxon 9V 0.7A motors
• Get driver that fits-- 11/23/06 Found one from Freescale see below
• Determine PWM frequency
• Order Samples --11/09/06
• Build Schematic and part model
  • Determine how to generate signals
• Test
• Integrate Scehmatic

Specs

Device	PWM motor driver
Drive Power	9V 1-1.5A TYP 3A Max
Logic Voltage	3.3V
Configuration	Low-Side
Fault Monitoring	Yes
Overcurrent/voltage/temp Protection	Yes
Package	SOIC or PO-SOIC

Device	BLDC FPGA
Logic Voltage	3.3V
?	??

Schematics

Schematics

BLDC Controllers

DSC Digital Signal Controllers

Micros

Specialty Controllers

Driver from SMT. Takes in a voltage.

FPGAs

Motor Drivers

• Freescale Motor Driver

Connectors (Drivers to Motors)

Receptacle 12 Pos Power Molex Part No. 39-01-2125 Digikey Part No. WM23705-ND

Header 12 Pos Power Molex Part No. 39-28-8120 Digikey Part No. WM23805-ND

Articles

DC Motors in General

• Wealth of links on Electric motors in general

Brushless Motor Control

• Microchip article on the fundamentals.
• Microchip article on feedback circuits for BLDC motors.
• Microchip article on BLDC made easy.
• EE times article aon BLDC
• Wikipedia on BLDC
• BLDC control using AVR 443
• BLDC control from Freescale

Links

Electrical Homepage