Servo motors – Info
What is a servo motor and what is an incremental encoder?
A servo motor is an electric motor in which the acceleration and the rotational speed can be controlled. Besides, the electric motor is equipped with a sensor (incremental encoder), which allows position determination. The determined rotational position is sent to the servo controller using control electronics. These, in turn, control the movement of the motor according to the setpoint data, which can be adjusted.
Servo motors and their use
The use of servo motors in the industrial sector is particularly advantageous in various machine tools, packaging machines or industrial robots. However, this type of motor is also used in the field of model making, for example, in remote-controlled model aircraft or ships. The demand for drives with servo motors, even in the area of CNC controlled machines is continuously increasing.
What is the difference between servo motors and stepper motors?
In the servo motor, the magnetic rotor is connected to a sensor, which in turn permanently transmits the exact positioning of the rotor. Accordingly, servo motors continuously calculate the difference between the actual and target position and adjust it through appropriate movement. This closed control loop ensures that the motor operates as instructed. For more complex requirements for specific applications, servo motors are the right choice.
Stepper motor vs servo motor
The stepper motor, on the other hand, moves the magnet over the magnetic coil, as the name suggests, step by step, from one position to the next. No position sensor is necessary here, because the stepper motor moves with the help of pulses. These take place step by step and thus position the motor also precisely. Compared to servo motors, stepper motors are not only cheaper but also easier to commission. They also have a high holding torque and high acceleration in the lower speed range.
Which advantages does a servo motor – servo router have?
In contrast to a stepper motor, servo motors do not react with a loss of steps, for example, if the axes jam. That is because, unlike the stepper motor, with which you have to make a new reference run after a collision, the servo motor does not jam. Instead, the drive stops and the position reached is not lost.
If the application requires a high speed, a servo motor is more suitable. That is because high torque is guaranteed at high speed. Therefore, the conclusion is that servo motors have more power in operation than stepper motors. Also, the servo motor has a better acceleration performance, and you can use it ideal for applications that require a fast start and stop.
OPERATING COSTS OF THE T-REX SERVO SERIES
Minimal maintenance requirements of the servo router
Due to the solid construction of the CNC router, the maintenance requirement is minimal. However, one should not do without an essential and visual inspection of the machine and the components once a year. That allows the tolerances to be maintained, and the production results’ quality remains consistently high. Besides, the machine operator can carry out all standard tasks without any problems.
Manageable maintenance costs
Both T-Rex machine series, the servo and stepper motor, have manageable operating and maintenance costs, with the expenses resulting only from the prices for the lubricants used.
With an optimal software setting of the central lubrication interval and daily economic use, the estimated expenditure is about 20€ (depends on the lubricant’s quality) for two months.
Low power consumption
Taking the largest T-Rex model 2040 as an example, including the auxiliary units spindle, tool changer and vacuum table, we have a power consumption of 20 kWh, roughly equivalent to 5€ (depending on the power supplier). If you now operate a smaller machine size with fewer accessories, the costs decrease accordingly.
Spare parts supply
In case of the need for spare parts, we have the standard elements permanently in stock. There is no need for additional unnecessary downtime or delays in emergencies, as considerable downtime can be avoided.
Daily cleaning of the work area
Daily care and cleaning of the work area and the CNC machine should be a matter of course, significantly since this can extend the router’s service life, including accessories. Whether you decide to sweep, blow off, or vacuum is entirely up to you. After all, this is the only way to ensure a smooth work process and flawless production in the long term. It also reduces the cost of unnecessary repairs and the risk of breakdown.