How do I choose a DC servo motor?
Top three factors in choosing a servo motor
- Continuous torque.
- Peak torque.
- Speed.
- Gear ratio.
- Inertia.
- Accuracy.
- Environment factors.
- Efficiency.
What are the important specification of a DC servo motor?
DC Servo motors have lightweight, low-inertia armatures that respond quickly to excitation-voltage changes. In addition, very low armature inductance in these servo motors results in a low electrical time constant (typically 0.05 to 1.5 msec) that further sharpens servo motor response to command signals.
What are the requirements of good servo motor?
The ratio of the output torque to the moment of inertia is required to generate sufficient acceleration or braking torque. The servo motor is required to have sufficient output torque at low speed and to run smoothly so as to minimize the intermediate link in connection with the mechanical part.
What are the features of servo motor?
The servo motor is specialized for high-response, high-precision positioning. As a motor capable of accurate rotation angle and speed control, it can be used for a variety of equipment. A rotation detector (encoder) is mounted on the motor and feeds the rotation position/speed of the motor shaft back to the driver.
How is the output of a servo motor controlled?
Once the servomotor has been selected, choose a servo drive rated for the correct input voltage and with sufficient output current to drive the servo motor. Servo drives can be controlled via several different interface types. These interfaces include pulse-and-direction digital control, analog control, and other servo networks.
Which is better motion control AC or servo?
Correctly sizing motors in a motion control application is more difficult than sizing an AC induction motor because not only must acceleration, deceleration and running torque be taken into account, but also the ability of the servo motor to tightly control the load’s speed, position or torque.
Can a servo system handle a 10 : 1 mismatch?
While many servo systems can handle mismatches of much higher than 10:1, better system control and response will result with an inertia mismatch of 10:1 or less. The servo motor size directly affects other servo system components, so right-sizing the motor is critical.
What does intermittent torque mean in a servo system?
Intermittent torque indicates how much torque a motor can produce in a short period of time based on current limits of the drive and motor. The intermittent (or peak) torque of a motor can be much higher than its rated torque, and servo systems are usually designed to operate within that peak torque range when accelerating or decelerating the load.