Summary of the key issues of the servo motor drive

1. How to use stepper motor driver?

According to the current of the motor, use a driver that is greater than or equal to this current. If low vibration or high precision is required, a subdivision drive can be used. For high-torque motors, use high-voltage drivers as much as possible to obtain good high-speed performance.

2. When to choose a DC servo system and what is the difference between it and AC servo?

DC servo motors are divided into brush and brushless motors. Brushed motor has low cost, simple structure, large starting torque, wide speed adjustment range, easy control, maintenance is required, but maintenance is convenient (changing carbon brushes), generates electromagnetic interference, and has requirements for the environment. Therefore, it can be used in common industrial and civil occasions that are sensitive to cost. The brushless motor is small in size, light in weight, large in output, fast in response, high in speed, small in inertia, smooth in rotation and stable in torque. The control is complex, easy to realize intelligence, and its electronic commutation method is flexible, and it can be square wave commutation or sine wave commutation. The motor is maintenance-free, highly efficient, low operating temperature, low electromagnetic radiation, long life, and can be used in various environments. AC servo motors are also brushless motors, which are divided into synchronous and asynchronous motors. At present, synchronous motors are generally used in motion control. They have a large power range and can achieve great power. Large inertia, low maximum rotation speed, and rapid decrease as the power increases. Therefore, it is suitable for low-speed and smooth running applications. Summary of the key issues of the servo motor drive

Summary of the key issues of the servo motor drive

3. There is a servo motor with encoder feedback, can it be controlled by a servo drive with only a tachometer port?

Yes, it needs to be equipped with an encoder to tachometer signal module.

4.Can the domestic drive or motor be matched with foreign high-quality motors or drives?

In principle, it is possible, but it can only be used after knowing the technical parameters of the motor, otherwise it will greatly reduce the expected effect, and even affect the long-term operation and life. It is best to consult the supplier before making a decision.

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

It is recommended to select the power supply voltage value 10%-50% higher than the maximum required voltage. This percentage varies with Kt, Ke, and the voltage drop in the system. The current value of the driver should be enough to deliver the energy required by the application. Remember that the output voltage value of the driver is different from the supply voltage, so the output current of the driver is also different from the input current. In order to determine the appropriate supply current, it is necessary to calculate all the power requirements for this application and add another 5%. According to the formula I = P/V, the required current value can be obtained.

6. Which working method can I choose for the servo drive?

Different modes are not all present in all models of drives

7. How to ground the drive and the system?

A. If there is no isolation between the AC power supply and the drive 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 equipment damage and personal injury. Because the AC public voltage is not to the ground, there may be a very high voltage between the DC bus ground and the ground. B. In most servo systems, all common ground and ground are connected together at the signal end. The ground loops generated by multiple ways of connecting the ground are easily affected by noise and generate flow at different reference points. C. In order to keep the command reference voltage constant, connect the signal ground of the driver to the signal ground of the controller. It will also be connected to the ground of the external power supply, which will affect the operation of the controller and the drive (such as the 5V power supply of the encoder). D. It is more difficult to ground the shielding layer. There are several methods. The correct shield grounding is at the reference potential point inside the circuit. This point depends on whether the noise source and receiver are both grounded or floating. Make sure that the shielding layer is grounded at the same point so that ground current does not flow through the shielding layer.

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