Title
of Activity: Research on structure,
component and design.
Objective:
Research
what component, structure design for the project (Motor)
·
- 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.