The brushless servo systems are developed with the stator being provided with the windings or sometimes on the outer surface of the motor. Permanent magnets remain attached to the rotor. The position of the windings plays an important role in providing a shortened path for the escape of heat that is generated in the winding. The windings should be located near the finned surface of the motor for efficient heat decapitation. This is the main reason behind the increased thermal efficiency exhibited by the brushless servo system as compared to a servo system that runs on DC motor. The brushless servo motors are capable of producing higher power ratings than other same sized and specification motors.
In the working principal of a servo motor, reduced rotor inertia and lack of mechanical commutator limits output with respect to enhanced speeds and accelerated abilities. The encoder feedback signal is utilized by the servo controller and the drives that it controls to adjust the motor torques continuously to maintain the desired positions. This is what is known as a closed loop servo system. This is the reason why the electrical requirements of a brushless servo system are more complex and therefore expensive than other servo motors.
While DC servo motors use a mechanical commutator for delivering the required current to the particular torque in order to produce requisite windings. The brushless motors on the other hand require a negative feedback mechanism in order to sense the location of the rotor with the permanent magnet with respect to the kind of signal that has been sent to the windings. It is the responsibility of the servo drive to maintain the correct coordination between the magnetic vector that is produced by the windings and the position of the rotor to produce the perfect torque.
Advanced brushless servo systems focus on providing enhanced and effective closed loop servo performance. For this, the systems employ proprietary control of the torque with advanced servo algorithms.
Some of the common applications of brushless servo systems are in enhancing speed and acceleration, changing loads, clamping and pressing.
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Article by Jenny at Inter-dev Internet Marketing Company on behalf of Nanovibronix.com – servo drives
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