Estun Servo Motor - How to Select Servo Motor (16-20)

16. Is it safe to use a DC power supply voltage greater than the rated voltage value to drive the motor?

Normally this is not a problem, as long as the motor is operating within the set speed and current limits. Because the motor speed is directly proportional to the motor line voltage, the selection of a certain supply voltage does not cause overspeed, but failures such as the drive may occur.

In addition, it is important to ensure that the motor meets the minimum inductance factor requirements for the drive, and that the current limit value set is less than or equal to the rated current of the motor.

In fact, it's great if you can make the motor run slower (below the rated voltage) in your design.

Running at lower voltages (and therefore lower speeds) results in less brush bounce and less brush/commutator wear, lower current consumption and longer motor life.

On the other hand, if the size and performance requirements of the motor require additional torque and speed, it is also possible to overdrive the motor, but at the expense of the service life of the product.

17. How to choose the appropriate power supply for the application?

It is recommended to choose a power supply voltage value that is 10%-50% higher than the maximum required voltage. This percentage varies depending on Kt, Ke, and voltage drop within the system. The current value of the drive should be sufficient to deliver the energy required for the application. Keep in mind that the output voltage of the driver is different from the supply voltage, so the output current of the driver is not the same as the input current. In order to determine the appropriate supply current, all the power requirements for this application need to be calculated and increased by a further 5%. The required current value can be obtained by calculating the formula I=P/V.

18. What kind of working mode can I choose for the servo drive?

The different modes are not all present in all models of drives.

19. How are the drivers and systems grounded?

a. If there is no isolation between the AC power supply and the driver's DC bus (such as a transformer), do not connect the non-isolated port of the DC bus or the ground of the non-isolated signal to the ground, which may cause damage to the equipment and personal injury. Because the common voltage of the AC is not to the ground, there may be a high voltage between the DC bus ground and the earth.

b. In most servo systems, all common ground and earth are connected together at the signal end. The ground loops generated by the various ways of connecting the earth are susceptible to noise and generate flow at different reference points.

c. In order to keep the command reference voltage constant, the signal of the driver should be connected to the signal ground of the controller. It is also connected to an external power supply, which will affect the operation of the controller and driver (e.g. the 5V power supply of the encoder).

d. Shielding grounding is more difficult, there are several methods. The correct shield ground is at a reference point inside its circuit. This point depends on whether the noise source and receiver are grounded at the same time, or floating. Make sure that the shield is grounded at the same point so that ground current does not flow through the shield.

20. Why can't the reducer be matched with the motor at the standard torque point?

If we take into account the maximum continuous torque generated by the motor through the reducer, many reduction ratios will far exceed the torque class of the reducer.

If we were to design each reducer to match the full torque, there would be too many combinations of internal gears of the reducer (larger volume, more material). This makes the product expensive and violates the "high performance, small size" principle of the product.

Estun Servo Motor - How to Select Servo Motor (16-20)

Estun Servo Motor - How to Select Servo Motor (16-20)

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