Differences between digital servo n analog servo

Digital Servo and analog servo (RC Servos) in terms of the basic mechanical structure is exactly the same, mainly driven by a motor, reduction gear, control circuits and other components, and digital and analog servo steering gear is the biggest difference reflected in the control circuit, a digital servo control circuit of the servo microprocessor and more crystal than analog. Do not underestimate this change, it has to improve steering performance has a decisive influence.
In the following two digital servos with analog servos are different:
1. The input signal is processed mode receiver;
2. The initial control servo motor current, reducing non-reactive zone (no response signal to a small control area), increased resolution and greater fixing strength.

Analog servo at no load, no power is transmitted to the servo motor. When a signal is input for the steering gear to move, or by external servo arm when the rudder opportunity to respond to the servo motor drive power (voltage). This power is actually transmitted 50 times per second, the maximum voltage is modulated to open / off pulses, and produces small pieces subparagraph power. When increasing the width of each pulse of the time, such as the effectiveness of electronic transmission will be up to the maximum power / voltage transmitted to the motor, the motor is rotated so that the servo horn refers to a new location. Then, when the electronic part of the steering potentiometer tell it has arrived at the specified location, then the pulse power is reduced pulse width, and deceleration of the motor. Until there is no power input, the motor stops completely.

Analog servo "disadvantage" is: Suppose a power short pulse, followed by a long pause, does not give much incentive applied to the motor to rotate. This means that if there is a relatively small operation control, steering will be sent to a small initial pulse motor, which is very inefficient. This is why analog servos have "no reaction zone" exists. For example, the steering gear for small movements of the transmitter, the reaction is very slow or no response.

Two advantages with respect to traditional analog servos, digital servos are: 1 because of a microprocessor, a digital servo in the servo motor power pulse before sending it to the input signal according to the parameters set deal with. This means that the power pulse width, that incentive power of the motor, according to the program operation the microprocessor and adapted to the different functional requirements, and optimize servo performance. 2. The digital servo at a much higher frequency pulse transmitting power to the motor. That is, relative to the conventional 50 pulses / sec, is now 300 pulses / sec. Though, that high-frequency relationship, each power pulse width is reduced, but the motor receiving more excitation signal at the same time, and turn faster. This also means that not only servo motor at a higher frequency response of the transmitter signal, and "no reaction zone" smaller; the reaction becomes faster; acceleration and deceleration faster, softer; digital servos offer higher accuracy and better fixation strength.