WEEK 7 - research about the components that i am going to choose for my project (Motor )

Title of Activity:  Research on structure, component and design.

Objective: 

Research what component, structure design for the project (Motor)

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• Choosing a Motor Controller    

Motor controllers can only be chosen after done selecting motors/actuators. Also,   the current a motor draws is related to the torque it can provide: a small DC motor will not consume much current, but cannot provide much torque, whereas a large motor can provide higher torque but will require a higher current to do so.

Motor Controller
DC Motor Control	Servo Motor Control	Stepper Motor Control	Linear Actuator Control

    DC Motor controller

  Motor controllers receive supply voltages and provide signals to motor drives that are interfaced to motors. They are used to start, stop, and run motors in a programmed manner. Motor controllers can be used to gradually start or increase the speed of a motor, increase torque, or reverse rotational direction of the motor. They can also be used to reduce cost by using smaller wire and reduced-amperage devices to control the motor. Controllers are used due to the demands of the operating system, installation requirements, or to increase motor efficiency.

There are two basic types of controllers: electronic and electromechanical.

·         Electronic units are very sophisticated and include features such as soft starting and variable frequency drives. Electronic units can be programmed to respond to system inputs and pre-set running conditions.

·         Electromechanical units make use of electromagnetic contractors or relays to stop, start, and reverse the motor's direction.

Servo Motor Control

 Servo control from a  radia control  receiver to the servos is done by sending each servo a PWM  (pulse width modulation) signal, a series of repeating pulses of variable width.

 Given the rotation constraints of the servo, neutral is defined to be the position where the servo has exactly the same amount of potential mechanical rotation in the clockwise direction as it does in the counter clockwise direction. It is important to note that different servos will have different constraints on their rotation but they all have a neutral position, and that position is always around 1.5 milliseconds (ms).

Stepper Motor Controller

A stepper motor or step motor or stepping motor is a brushless DC electric motor that divides a full rotation into a number of equal steps. The motor's position can then be commanded to move and hold at one of these steps without any feedback sensor (an open-loop controller), as long as the motor is carefully sized to the application in respect to torque and speed.