Integrated Easy Servo Motors

The iES series easy servos are highly integrated easy servo or closed-loop stepper systems. An iES integrated easy servo has an easy servo motor and an easy servo drive. At very compact size and with all components integrated, the iES series easy servos can save mounting space, eliminate encoder connection and motor wiring time, reduce interference, and lower cable and labor cost.

The iES series use an encoder to detect the real positions of the motor continuously. If necessary, the iES drives will compensate the loss of synchronization, which is usually caused by abrupt load fluctuations or accelerations, and can not be compensated with a conventional stepper. Thus, the iES can provide very precise position control like a servo without time consuming servo tuning.

Due to closed loop control and adoption of advanced control algorithm, the iES series easy systems can always implement 100% torque of the motor, and do not need the huge 50% torque reservation in normal open-loop stepper systems. This feature significantly improves system high speed performance. While open-loop stepper systems are typically adopted in applications under 1,000 rpm, the iES series easy servo systems are ideal for many applications up to 2,000 RPM; sometimes even for 3,000 RPM!

In open-loop stepper systems, output current to the stepper motor from the step driver is constant. No matter what load condition is and how much current is needed, the stepper driver will always output a constant current.

Since the iES runs in closed-loop, the iES drives only put as much current into the motor as required to drive the motor to the target. Motor heat is 20 to 40 ^oC lower compare to a conventional stepper drive which runs at full current most of the time. Less power consumption and longer motor lifetime can be achieved, reducing using and maintenance cost.

Unlike a conventional stepper drive, the iES easy servo drives adopt vector control and filtering, producing a smooth motion with minimum torque ripples. Extra low motor noise is achieved.

For the case of conventional servo motor systems, there is a considerable delay between the commanding input signals and the resultant motion because of the constant monitor of the current position, necessitating a waiting time until it settles, called settle time.

Since the iES easy servo is a stepper motor based system, it operates in synchronism with command pulses and has no hunting problem. When it stops, its position is completely stable and does not fluctuate. It is a great feature of the iES when rapid motions with a short distance are required and it is ideal for applications such as bonding and vision systems in which hunting would be a problem.

Since the iES series is a stepper motor based system, so it has the advantages of high stiffness at standstill, high torque at starting and low speed, eliminating gear box.  The iES adopts sophisticated control algorithms to take advantage of high-torque capability, providing direct-drive of high inertia loads such as flywheels and belt drives. These load inertials may be as large as 100 times the motor inertia while still providing smooth positioning control. Conventional servo systems typically cannot exceed a 10:1 inertial mismatch.

Unlike a servo system which usually needs the engineer to spend a long time to learn how to use tuning tools and tune the gains for a satisfying  performance, the iES series  is ready for operation within a very short period of time. Set the microstep resolution and operating current, then the system is ready and offers high performance approaching to a fine tuned servo. Save time and save cost.