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What is a servo motor?


A servomotor is a type of electric motor that precisely controls the velocity, the position of the motor shaft as well as the acceleration and deceleration. Controlled by an external device – called “servo drive” – the servo motors purpose is to provide a very precise motion control. It is capable using this precise control to reach any specific position and to hold or push and or rotate an object to some specific angle or distance. Thus, from this specification, the servomotor’s name is derived. Indeed, the servomotor word gets its name from the Latin «servus,» that means «server» in English.
In our case, CTD’s servomotors are used by huge spectrum of industrial and high-end applications like robotics, printing, entertainment, etc. However, even though these applications are all different, all these applications have the same needs: accurate position, speed control and high torque density.




How does A Servo Motor Work?


A permanent magnet (PM) motor is an AC motor that uses magnets imbedded into or attached to the surface of the motor’s rotor.
The control of the PM motors is done using a variable frequency drive (VFD). In most cases a position feedback is used as a reference to VFD in order to precisely control the speed and position of the motor.
One of the advantages of the PM motors is the size. For similar power levels, a PM motor has higher power density per length, making it shorter and lighter than conventional motors.
Other significant advantages of a PM motors include better efficiency and higher power factor performance.
PM servo motor can be used to consume as well as to generate energy.




What are the industrial applications for servomotors?


Thanks to its compact size and its effiency, servo motors are used by many industrial applications like:
- Robots – precise joint movement articulation
- Microturbines – energy generation
- Automated Guided Vehicles – traction, lift and rotate axes
- Printing Machines – precise position control of the print heads. Move precisely the paper -along to print multiple rows of text or graphics in exact lines
- Packaging Machines – move, stop, and start conveyor belts
- Solar Panels – panel angle correction
- Metal Forming and Cutting – precise motion control for milling machines, lathes, grinding, and bending
- Textile – precise control of industrial spinning and weaving machines
-Woodworking/CNC - precise position and speed control of woodturning mechanism




What types of servomotors are available at CTD?


Servomotors can be categorised into 2 types: synchronous and asynchronous motors. At CTD, we are specialised on the design and manufacture of synchronous servo motors. Synchronous motor is electrical machine whose speed of the rotor and the stator magnetic field are equal. The coils’ stator - that are the external part – are supplied by alternating current what produce a rotating magnetic field whereas inside rotor attached to the output shaft producing also a second rotating magnetic field. In our case, the rotor magnetic field is created by permanent magnets. That’s why we can also designated our motor by the terms of “brushless servo motor” or “Three-phase alternating current (AC) servomotor”.




What are the advantages of synchronous servomotor?


The advantages of the brushless servomotors are multiple:
— High torque density
— High efficiencies, especially in low-speed unity power factor
— High accuracy thanks to feedback from encoders integrated
— Higher resistance than induction motor
— High design of tolerance and better bearings
— Use of closed loop system to provide smoothness of operation
— Excellent performance in dynamic applications
— Ability to control the power factor
— Peak torque is always available even from stationary




Can you do more than 12 bits of Multi-Turn data on your absolute encoders?


Currently our product line only offers products with a maximum of 12 bits of Multi-turn data. {NB: As of next year we will offer 16 bit multi-turn data}




You offer 48V, 230V and 400V windings for your motors, can I have any other voltages?


Depending on the solution we can offer a winding specially tailored to your application. We are able to wind anywhere from 48V to 400V on the motors.




Can you supply me a gear motor solution?


CTD are capable of mounting almost any gearbox to our motors, please consult with your local CTD representative.




Can you provide an alternative for competitors motors?


For most permanent magnet servo motors we can do a direct replacement, Please see your local CTD representative for more information




What frame sizes do you offer?


Please refere to the following product pages:
- HD
- FM
- Low voltage
- Integreated drive
-Torque motor
-Geared motor




What power motors do offer?


Please refere to the following product pages:
- HD
- FM
- Low voltage
- Integreated drive
- Torque motor
-Geared motor




What is the maximum speed for your motors?


The maximum speed depends of the range.
- For FM range, the maximum speed is 8000rpm
- For HD motors, the maximum speed is 10,000rpm
-For the high-speed motors, the maximum speed will be available up to 250,000rpm.




Do you offer Single cable motors?


We offer Single cable solutions using EnDat2.2 encoders, we can also offer DSL encoders mounted to the motors.





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