szewang2805
Nov 28, 2007, 07:02 AM
Do you know the Advantages of Digital Servo?
Higher resolution-less deadband, more accurate positioning
1. Faster control response-increased acceleration
2. Constant torque throughout the servo travel
3. Increased holding power when stationary
The "Analog Servo" has custom Logic chip and timing components
The "Digital Servo" has a microprocessor,FET amplifier.
There are two main categories of servos available, analog and digital. Analog servos have been around for quite some time, servos work by sending pulses of power to the servo motor, similar to the way an ESC powers an electric RC truck. However Digital servos have significant operational advantages over analog servos, but with these advantages also come minor disadvantages, and this fact file will try to explain the positives and negatives of Digital servos in simplified terms.
First of all, a digital servo is the same as a traditional servo. Digital servos have the same motors, gears and cases as analog servos and the greatest difference between them is on the controlling circuit, the Digital Servo has a Quartz crystal controlled microprocessor, FET amplifier, which has a decisive influence on the performance of servos.
Where a digital serve differs, is in the way it processes the incoming receiver information, and in turn controls the initial power to the servomotor. Due to a small microprocessor inside the case, can specifically tailor the pulses being sent to the servo's motor. It can also send a larger number of pulses, which means that the range of motion can be broken down into a much finer pattern. Since more pulses are being sent, the servo is more responsive and contains a significantly less amount of deadband.
In a conventional servo, no power is being sent to the servomotor. When a signal is then received for the servo the move, or pressure is applied to the output arm, the servo responds by sending power/voltage, is pulsed or switched On/Off at a fixed rate ,creating small 'blips' of power. By increasing the length of each pulse/blip of power, a speed controller affect is created, until full power/voltage is applied to the motor, accelerating the servo arm towards its new position.
In turn, as the servo positioning pot tells the servo's electronics it is reaching its required position, the power blips are reduced in length to slow it down, until no power is supplied and the servomotor stops.
The Distinct Advantages of a Digital Servo.
First, it equips with the microprocessor, to receive the incoming signal and apply preset parameters to that signal before sending its pulses of power to the servomotor. This means the length of the power pulse/blip, and therefore the amount of power sent out to activate the motor, can be adjusted by the microprocessors program to match its function requirements and therefore optimize the servo's performance.
The second, is that a digital servo sends pulses to the motor at a significantly higher frequency. This means that, as opposed to the motor receiving 50 pulses/sec., it now receives 300. Although the length of the pulses is reduced in a direct ratio to the higher frequency because the power is being turned on/off to the motor more frequently, the motor has more incentive to turn. This also means that not only does the servomotor respond faster to the commands, but that increases or decreases in power for acceleration 、deceleration are able to be transmitted to the servomotor far more frequently. This gives a digital servo an improved deadband, a faster response, quicker and smoother acceleration/deceleration, and better resolution and holding power.
The Disadvantage of a Digital Servo.
Digital servos are definitely more advanced than their analog counterparts. However there is one disadvantage to digital servos, they use more power. Digital servos will drain a battery quicker than an analog servo would. Also running multiple digital servos is generally a bad idea due to the added current draw that they can pull when operated together. In situations where multiple digital servos are used, such as planes, special wiring and extra batteries are the preferred route.
Digital servos are the future for model control, and anyone who has used them says the difference is so significant that they would never return to analog servos, if there is a digital one available to fit the application.
Therefore, Flyermate Industrial Company designed and produced the Flyermate D55.0 Genuine Digital Servo which is the only solution!
Specification of Flyermate D55.0 Genuine Digital Servo:
-Operating Angle: 180degree
-Gear Material: Copper
-Weight: 55.0g
-Operating speed:
0.15sec/60 degree(4.8v)
0.13sec/60 degree(6.0v)
-Stall torque:
8.8kg/cm(4.8v)
10kg/cm(6.0v)
-Operating Voltage: 4.8v - 6.0v
-Operating Current: 1~3A
-Wire Length: 30.6cm
-Dimension: 41.0mm X 20.5mm X 41.5mm
Contact: www.flyermate.com
Higher resolution-less deadband, more accurate positioning
1. Faster control response-increased acceleration
2. Constant torque throughout the servo travel
3. Increased holding power when stationary
The "Analog Servo" has custom Logic chip and timing components
The "Digital Servo" has a microprocessor,FET amplifier.
There are two main categories of servos available, analog and digital. Analog servos have been around for quite some time, servos work by sending pulses of power to the servo motor, similar to the way an ESC powers an electric RC truck. However Digital servos have significant operational advantages over analog servos, but with these advantages also come minor disadvantages, and this fact file will try to explain the positives and negatives of Digital servos in simplified terms.
First of all, a digital servo is the same as a traditional servo. Digital servos have the same motors, gears and cases as analog servos and the greatest difference between them is on the controlling circuit, the Digital Servo has a Quartz crystal controlled microprocessor, FET amplifier, which has a decisive influence on the performance of servos.
Where a digital serve differs, is in the way it processes the incoming receiver information, and in turn controls the initial power to the servomotor. Due to a small microprocessor inside the case, can specifically tailor the pulses being sent to the servo's motor. It can also send a larger number of pulses, which means that the range of motion can be broken down into a much finer pattern. Since more pulses are being sent, the servo is more responsive and contains a significantly less amount of deadband.
In a conventional servo, no power is being sent to the servomotor. When a signal is then received for the servo the move, or pressure is applied to the output arm, the servo responds by sending power/voltage, is pulsed or switched On/Off at a fixed rate ,creating small 'blips' of power. By increasing the length of each pulse/blip of power, a speed controller affect is created, until full power/voltage is applied to the motor, accelerating the servo arm towards its new position.
In turn, as the servo positioning pot tells the servo's electronics it is reaching its required position, the power blips are reduced in length to slow it down, until no power is supplied and the servomotor stops.
The Distinct Advantages of a Digital Servo.
First, it equips with the microprocessor, to receive the incoming signal and apply preset parameters to that signal before sending its pulses of power to the servomotor. This means the length of the power pulse/blip, and therefore the amount of power sent out to activate the motor, can be adjusted by the microprocessors program to match its function requirements and therefore optimize the servo's performance.
The second, is that a digital servo sends pulses to the motor at a significantly higher frequency. This means that, as opposed to the motor receiving 50 pulses/sec., it now receives 300. Although the length of the pulses is reduced in a direct ratio to the higher frequency because the power is being turned on/off to the motor more frequently, the motor has more incentive to turn. This also means that not only does the servomotor respond faster to the commands, but that increases or decreases in power for acceleration 、deceleration are able to be transmitted to the servomotor far more frequently. This gives a digital servo an improved deadband, a faster response, quicker and smoother acceleration/deceleration, and better resolution and holding power.
The Disadvantage of a Digital Servo.
Digital servos are definitely more advanced than their analog counterparts. However there is one disadvantage to digital servos, they use more power. Digital servos will drain a battery quicker than an analog servo would. Also running multiple digital servos is generally a bad idea due to the added current draw that they can pull when operated together. In situations where multiple digital servos are used, such as planes, special wiring and extra batteries are the preferred route.
Digital servos are the future for model control, and anyone who has used them says the difference is so significant that they would never return to analog servos, if there is a digital one available to fit the application.
Therefore, Flyermate Industrial Company designed and produced the Flyermate D55.0 Genuine Digital Servo which is the only solution!
Specification of Flyermate D55.0 Genuine Digital Servo:
-Operating Angle: 180degree
-Gear Material: Copper
-Weight: 55.0g
-Operating speed:
0.15sec/60 degree(4.8v)
0.13sec/60 degree(6.0v)
-Stall torque:
8.8kg/cm(4.8v)
10kg/cm(6.0v)
-Operating Voltage: 4.8v - 6.0v
-Operating Current: 1~3A
-Wire Length: 30.6cm
-Dimension: 41.0mm X 20.5mm X 41.5mm
Contact: www.flyermate.com