Pmdc motor pdf

A short summary of this paper. Download Download PDF. Translate PDF. Charles 1, D. Oku 2, F. Faithpraise 3, E. Therefore by controlling the armature current, the DC motor speed is indirectly controlled.

The aim is to design a reliable controller with a good disturbance rejection. The reliability of the system model was tested with a torque of 10Nm and the responses show that the cascade-PID controller amongst all controller designs tested produced a stable, reliable, and robust but not very sensitive system, while the ordinary PID controller produced a highly sensitive, but less stable system.

DC motors are in particular popular in high power and precise servo applications due to their reasonable cost and ease of control [4].

Due to this lack of armature interaction, they can generate high momentary starting and acceleration torques, typically 10 to 12 times full rated torque [5].

This makes PMDC motors suitable in applications requiring high starting torques. It is for this reason that its speed has to be controlled so as to control the current and resulting torque. The current response showed chattering in output and a large overshoot when a load of torque 12Nm was applied.

Chattering in shaft position is dangerous for the life span of the motor and consequently the system. Similar works compared the performances of a conventional PI cascade controller to that of an intelligent self-tuning PI cascade controller using fuzzy algorithm [8] and results proved that the auto-tuning PI controller offered a better settling time when a load is applied.

A self-tuning PI cascade was used in [8] due to the difficulty involved in properly tuning the PI parameters to perfection without a deep knowledge of the behavior of the system to be controlled and subsequently a good mathematical model of the system. Many DC motor models exists which can accurately represent the machine behavior, however, the model parameters must be set correctly for the mathematical model to provide a correct behavior [9], [10].

After obtaining a good mathematical model, the conventional single PI controller amongst other controllers tested were meticulously tuned to obtain satisfactory results due to their cost effectiveness, compared to their auto-tuned counterparts. So that, 7. However, the PID controller shows a better response for both state variables in terms of overshoot and oscillations as shown in Fig.

On the whole, both responses for both controllers are fast and very sensitive. The Cascade controllers show a better transient performance, as initial oscillations are minimized. They also present a larger settling time but required no current limiter because the inner-loop dynamics was well controlled. There is also a chance of getting mtoor poles permanently demagnetized pmdc motor due to excessive armature current during starting, reversal and mofor condition of the motor.

In the pictures above, this occurs when the core of the coil is horizontal—the position it is just about to reach in the last picture on the right. Tachometric Controls make Speed: This increases the zero-torque range of angular positions but eliminates the shorting problem; if the motor is started spinning by an outside force it will continue spinning. From Wikipedia, the free encyclopedia. Table B compares these commonly used materials. Form factor, which is the ratio of I rms to I dcindicates how close the driving voltage is to pure DC.

Pmdc motor brushes can now bridge two adjacent commutator segments without causing a short circuit. Motor, pdmc motoer, single phase motor, 3 phase motor, vibratory motor. The counter EMF aids the armature resistance to limit the current through the pmdc motor. E b is the back emf and V is the supply voltage. Basic configuration of a permanent magnet DC motor is very similar to that of a normal Pmdc motor motor.

Veena Nagar, Mumbai -Maharashtra. The pmdc motor field is obviously established by means of magnet. DC supply is applied across these brushes. Regulation is the ability of the motor pmdc motor control system to hold speed constant over the torque range. The rotor or armature of permanent magnet DC motor also consists of core, windings and commutator. The figure given below represents the working of an H-Bridge.

Represents the off-mode of the circuit. When the switches S1 and S4 are switched on, motor runs in clockwise direction Fig. When S2 and S3 are switched on, motor runs in anticlockwise direction Fig. It is featured to be programmed as a USB to serial converter. The specifications of Arduino UNO are given in table 1. Table 1. Clock Speed 16MHZ The controller is made upon a vero board which is quite similar to bread board but with no internal connections.

The mosfets and the mosfet drivers are placed as per the given diagram in the simulation. Then the pin diagram of the mosfet drivers are thoroughly studied and connections are made among the mosfets and the drivers via soldering method. The potentiometer used for controlling the speed and a 3 pin switch used to change the direction is also attached within the controller itself and connections are made.

Speed controller prototype implementing H-Bridge concept Fig. Any abnormal behaviour of power circuit can also affect the control side since both are electrically connected. Table 2. Speed of two motors at Loaded Condition while of armature resistance. On the other hand, due to the back emf the moving forward and backward speed is also decreased to some extent with load. At this condition, the inner motor 5. This 5. IEEE, Syahrizal, G. Mansur, and H. IOP Publishing, Volts IEEE, At this condition, the inner motor right motor — motor 2 rotates at lower RPM than of motor 1.

The direction switching is also done by the joystick itself. Two simultaneous motors are also being monitored in the latter half of the experiment. The obtained results are being compared with the real time results. Alongside there are some respected persons who deserves our greatest gratitude. We would like to thank Prof. Rammohan A. Booplag G. We would also like to thank to all our classmates who directly or indirectly helped us in completing the project work.

In addition, we would also like to thanks to the professors who all have introduced to various methodologies involved in our project work.