You need an engine for your design, but wonder what type of fit to choose? Here, we will analyze the basic features and compare the similarities and differences between DC DC motors, Servo Motors and Stepping motors to help you make better decisions.
DIRECT CURRENT MOTORS
Direct Current Motors are direct control motors composed of two wires (power cord and grounding wire). The DC motor is a one-way motor with continuously rotating power.
When you supply power, Direct Current Motors will start spinning, turning power into a function. Most Direct Current Motors will be spinning with very high RPMs (rpm), and Direct Current Motors will be used to cool the computer, or control the speed of the wheels.
To control the rotational speed of a DC motor, pulse width modulation (PWM) is used, which is a technique that controls the speed of operation by turning on and off electrical pulses. Percentage velocity with time of the device is controlled by the mechanism of switching off a certain degree of radius of rotation of the motor.
For example, a motor with 50% ac power (50% off and 50% turn on), the motor will rotate half the rotation at 100% (total). The purpose is to allow the pulse to be connected at a very fast speed so that the motor can continuously rotate at high frequencies without being stumbled.
A Servo Motors (Servo Motors) is a basic combination of four components: a DC motor, a gear, a microcontroller and a sensor.
Servo Motors’ positioning capability is often calculated to be more accurate than other direct current motors. Servo Motors usually consist of three wires: power cord, grounding wire and control wire. Unlike Direct Current Motors, which operate on AC switching, Servo Motors’ power supply is continuously charged. Servo Motors works by controlling the electric current, helping the motor to direct its direction accurately.
Servo Motors are designed to stop at a particular location. These positions need to be accurately calculated to make the machine work properly for the intended purpose of the designer. Take control of the rudder on a boat, for example, or make a robotic arm or leg move within a certain range.
Servo Motors will not spin like conventional Direct Current Motors, which rotate back and forth with a 360 degree angle of rotation (or more). Meanwhile, Servo Motors will operate by receiving a command signal that determines the position at the output and uses the power of a Direct Inductive Motors to rotate it to the correct position. . This position is determined by the micro-sensor.
PWM is used for command signal of servo motor. Unlike Direct Current Motors, which are controlled by pulse width modulation to control the rotational speed, servo motors use that pulse width modulation to determine the position of the motor shaft, not merely speed.
An average pulse unit is calculated based on the position of the shaft (usually about 1.5ms), the purpose is to keep the shaft in place. Each time the pulse value increases, the motor shaft will turn clockwise, and there will always be a shorter pulse to reverse the axis counterclockwise. The serpent control pulse is usually repeated about 20 mm / s. It can be said simply, the servo axis to move to where it then returned to the original position.
When the motor is commanded to move, it directs the axis to move to the desired position and remains in that position, even if there is an external force acting on it, the motor shafts will refuse Move away from the position set by the controller.
STEPPING MOTOR is essentially a power-boosting engine that uses a different approach to driving motion. In particular, STEPPING MOTOR operates by means of a DC rotary motor, integrated with the same STEPPING MOTOR control circuit operated by a magnet with multiple teeth arranged around a center gear to locate.