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DC Motor interface with Spartan3e FPGA Development Kit

DC Motor interface with Spartan3e FPGA Development Kit

 DC Motor

A DC motor is an electric motor that runs on direct current (DC) electricity. DC motors were used to run machinery, often eliminating the need for a local steam engine or internal combustion engine.

A direct current (DC) motor is another widely used device that translates electrical pulses into mechanical movement. In the DC motor we have only + and – leads. Connecting them to a DC voltage source moves the motor in one direction. By reversing the polarity, the DC motor will move in the opposite direction. One can easily experiment with the DC motor. For example, small fans used in many motherboards to cool the CPU are run by DC motors. By connecting their leads to the + and – voltage source, the DC motor moves. While a stepper motor moves in steps of 1 to 15 degrees, the DC motor moves continuously. In a stepper motor, if we know the starting position we can easily count the number of steps the motor has moved and calculate the final position of the motor. This is not possible in a DC motor.

DC Motor

                                   DC Motor Clockwise Rotation                                                  DC Motor Anti Clockwise Rotation

 Interfacing DC Motor with Spartan3e FPGA Development Kit

The Spartan3e FPGA Development Kit has external DC motor interfacing, indicated as in Figure. 5V DC Motor speed has controlled through PWM signal. Motor can run both clockwise/counter clockwise, Motor speed controlled by varying ENA (duty cycle) signal through program.

Driver IC L293D

 Interfacing DC Motor with Spartan3e FPGA Development Kit                                Schematics to Interface DC Motor with Spartan3e FPGA Development Kit

               Schematics to Interface DC Motor with Spartan3e FPGA Development Kit

  DC Motor Driver IC Placement in FPGA Development Kit

DC Motor Driver IC Placement in Spartan3e FPGA Development Kit

 VHDL Code Description

 The following DC Motor Code generates PWM pulse to run DC motor. To run the motor in Counter Clockwise direction invert output1 to LOW and Output2 to HIGH.

VHDL Program for DC Motor using Spartan3e FPGA Development Kit

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.STD_LOGIC_ARITH.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;

  

entity dc is

port ( clk    : in std_logic;       

rst    : in std_logic;                        

enable : out std_logic;                        

output1 : out std_logic;                        

output2 : out std_logic);

end dc;  

 

architecture Behavioral of dc is  

begin

process(rst,clk)

variable i : integer := 0;

begin

if rst = '1' then

if clk'event and clk = '1' then

enable <= '1';

if i <= 1005000 then

i := i + 1;  

output1 <= '0';

output2 <= '0';

elsif i > 1005000 and i < 1550000 then

i := i + 1;

output1 <= '1';

output2 <= '0';

elsif i = 1550000 then

i := 0;

end if;

end if;

end if;

end process;

end Behavioral;

User Constraint File

NET "clk" LOC = P185;

NET "enable" LOC = P115;

NET "output1" LOC = P113;

NET "output2" LOC = P112;

NET "rst" LOC = P6;