A device for testing and controlling servo drives. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Electrician

A device for testing and controlling servo drives. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Electric motors

Servo drives are now actively used in robotics, automation and electronic toys. There are many different servo control circuits on the Internet, but most of them are assembled on microcontrollers or other digital microcircuits. The scheme of the proposed device is shown in fig. 1 . It does not contain scarce parts and can be easily assembled by novice radio amateurs. The basis of the device is a symmetrical multivibrator based on transistors VT1 and VT2. A buffer stage is assembled on the transistor VT3. Output pulse frequency - 50 Hz. Their duty cycle (duration of the control pulse), and consequently, the position of the servo rotor is changed using a variable resistor R5. With the ratings of the elements indicated in the diagram, the position of the servo rotor approximately corresponds to the position of the resistor R5 engine.

Device for testing and controlling servo drives
Rice. 1. Diagram of the device

All elements, except for the variable resistor, are installed on a single-sided printed circuit board, the drawing of which is shown in fig. 2. Fixed resistors MLT, S2-23, variable - SP3-3, SPP-4, SPO, capacitors - K10-73, transistors - low-power npn structures of the KT315 or KT3102 series are used. The values of resistors and capacitors may differ from those indicated in the diagram by 20%. The board provides connectors (their type can be any) for direct connection of a servo drive (XP2) and a variable resistor (XP1). The appearance of the mounted board is shown in fig. 3.

Device for testing and controlling servo drives
Rice. 2. Printed circuit board and elements on it

Device for testing and controlling servo drives
Rice. 3. Appearance of the mounted board

For power, use a stabilized DC voltage source that ensures the normal operation of the servo. The device itself consumes a current of no more than 10 mA. Operation is maintained when the supply voltage changes from 3 to 12 V.

A properly assembled device starts working immediately. When the device is turned on for the first time, resistor R2 is selected (its resistance can be in the range of 2 ... 50 kOhm) until the output pulse repetition rate is 50 Hz (controlled by a frequency meter or oscilloscope). This operation is carried out without connecting the servo. When controlling a servo drive with an input resistance of the control input of more than 100 kOhm, the output signal can be taken directly from the collector of transistor VT1, excluding transistor VT3 and resistors R7 and R8 from the circuit.

Author: A. Butov

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