Speed Control and Direction Control of Dc Motor Using Arm7
An armature voltage control is used to control the supplied voltage of an armature of a 2kw separately excited DC motor. A buck regulator is used to vary the supplied voltage of the motor. A pulse width modulation (PWM) generator is implemented to supply the signal to the gate of the switch of the buck regulator. A series or cascade compensator is placed to control the duty cyclone of the pulse width modulation (PWM) generator in the closed loop control system. Pulse width modulation has one additional advantage which is that the pulse reaches the full supply voltage. It will produce more torque in a motor easily overcome motor resistance.SST 433 MHZ transmitter and STR 433MHZ receiver are the RF module used here.AT the end of the transmitter, four switches are provided to control the speed and direction of the DC motor which is located at the receiver side.
In real time development control system design technique is very useful.in domestic and industrial purpose DC motors are widely used. DC motor can be used in various applications and also can be used in various size and rates. In this system, we are going to control the speed and direction of dc motors. Productivity of material can be increased by increasing the speed of DC motor. As per our requirements we control speed & this can be achieved by using ARM-7.In this, firstly supply voltage is given to the ARM-7 microprocessor.5V DC pulse is generated by processor which is called PWM signal.PWM signals then given to the driver circuit.Funtion of driver circuit is generate 12V DC pulse and this is necessary to switch or trigger the MOSFET.Using duty cycle speed of DC motor is control. In this control system we used MATLAB software for speed and direction control of DC motor.
The binary form of amplitude modulation is on off keying (00k).As he fully supressing the carrier the transmitter is off and the logical 0(data line low) should be sent at that time. IN this form the transmitter current in this form the transmitter current is very low i.e. less than 1MA at the stage when logical is sent the carrier must be fully on as the modulecurrent consumption goes highest about 11MA with a 3v power supply. For the remote control application where power consumption and cost are the primary factors the on off keying method is to be used Hence they transmit a 0, the transmitter draws no power they exhibits significantly better power consumption than the fsk transmitter. As the high oscillators which have very stable centre frequencies they take longer to start up than low Q oscillators.
High performance DC motor drives are the robotic manipulators, electric trains like as metro, in the chemical process, and the rolling mills as well as the home electric appliances requires speed controllers to perform tasks these are the recent developments skills in science and technology provide a wide range scope of applications. Speed, torque and even direction of rotation these functions can be changed at any time to meet new condition, that means DC motor speed control capabilities. Our goal of project is by using ARM7 microprocessor to design a DC motor speed control and direction control. When there is a variation of load the processor will maintain the speed at the desired speed. We will vary the PWM signal from the microprocessor to the motor driver motor speed can be controlled back to desired value easily.
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