servo motor, servo systems, Types of Servo motor, Controlling a servo motor Servo drive applications
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The document provides an overview of servo systems, including types of servo motors (AC and DC), their control mechanisms, and applications across various industries. It explains the roles of controllers, drives, and feedback transducers in closed-loop control systems and describes how pulse width modulation is used for precise position control. Additionally, it lists applications ranging from robotics to CNC machines and metal fabrication.
servo motor, servo systems, Types of Servo motor, Controlling a servo motor Servo drive applications
- 1. Topics •servo systems •servo •Servo motor •Types of Servo motor •Controlling a servo motor •Servo drive •applications
- 2. Your Partner In Productivity Closed Loop Control • Controller is the “Brain” • Drive is the “Muscle” • Feedback Transducer is the “Eyes” Motion Command Input Controller Drive or Amplifier Mechanical Motion Output Feedback Transducer
- 3. Servo systems are “Closed Loop” in design control feedback control Width of material must be very precisely controlled
- 4. SERVO
- 5. AC servo motor Dc servo motor Continuous rotation servo motor Linear servo motor
- 6. A.C. servomotors: Basically it is an induction motor with two windings provided on the stator. One of the winding is called reference or main winding which is connected to constant magnitude ac voltage. The other winding is called control winding which is connected to voltage obtained form servo amplifier. For maximum flux linking air gap kept is minimum. The ac servomotors are used in the frequency range of 50 Hz to 400 Hz and from milliwatts power consumption to few hundred watts.
- 7. D.C. Servomotors DC servomotor is an ordinary dc motor. But it is a separately excited dc motor. The dc servomotors are further classified into two types: 1. Armature controlled type and 2. Field controlled type. In field controlled dc servomotors, the signal from the servo amplifier is applied to the field winding. The armature is connected to constant current source. In armature controlled dc servomotor, the constant current source is applied to the field winding whereas the servo amplifier output is connected to the armature.
- 8. Servo drive PLC (transistor type) Servo motor Power source contactor Load
- 9. Position control using Pulse Width Modulation Technique. The width of the pulse applied to the motor is varied and send for a fixed amount of time. The pulse width determines the angular position of the servo motor. For example a pulse width of 1 ms -a angular position of 0 degrees, a pulse width of 2 ms - a angular width of 180 degrees.
- 10. Electronic amplifier used to power electric servomechanisms. A servo drive monitors the feedback signal from the servomechanism and continually adjusts for deviation from expected behaviour
- 11. linear relationship b/n speed and electric control signal Steady state stability Wide range of speed control Low mechanical and electrical inertia Fast response
- 12. Robotics Conveyor belts Camera auto focus Robotic vehicles Solar tracking system CNC machines Antenna positioning Metal cutting & metal forming m/c – millimg m/c, lathe, grinding, pressing, punching, bending in metal fabrication. Textiles Printers Automatic door openers