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Guide for selection of Servo Motor and stepper motor

Date: 2020-08-21
Clicks: 921
Date: 2020-08-21
Clicks: 921

1. Depending on the application, simply determine:

   The nature of the load (such as horizontal or vertical load) , Torque, inertia, speed, accuracy, acceleration and deceleration, upper control requirements (such as port interface and communication requirements) , the main control mode is position, torque or speed mode. Power supply is DC or AC power supply, or battery-powered, voltage range. This is used to determine the type of motor and accompanying driver or controller.

2. stepper motor or Servo Motor System?

 In fact, the choice of which servo motor or stepper motor should be based on the specific application of the situation, each has its own characteristics.
Guide for selection of Servo Motor and stepper motor

3. How to use stepper motor driver?

According to the motor current, with greater than or equal to the current of the driver. If you need low vibration or high precision, can be equipped with subdivision type driver. For High Torque Motors, high voltage drives are used whenever possible to achieve good high speed performance.

4、2 phase and 5 phase stepper motor what is the difference, how to choose?

The cost of phase motor is low, but the vibration is large at low speed, and the torque decreases quickly at high speed. 5-phase motor has small vibration, good high-speed performance, 30 ~ 50% higher than 2-phase motor, and can replace servo motor in some occasions.

5. When to choose DC SERVO system, how is it different from AC SERVO system?

DC servo motor is divided into brush and brushless motor.

Brush Motor has low cost, simple structure, large starting Torque, wide speed range, easy control and maintenance, but easy maintenance (carbon brush) , electromagnetic interference, the environment requirements. Therefore, it can be used in general industrial and civil occasions which are sensitive to cost.

Brushless motor small size, light weight, high output, fast response, high speed, small inertia, smooth rotation, torque stability. The control is complex, easy to be intelligent, and the electronic commutation is flexible, which can be square wave commutation or sine wave commutation. Motor maintenance-free, high efficiency, low operating temperature, electromagnetic radiation is very small, long life, can be used in a variety of environments.

AC servo motor is also brushless motor, divided into synchronous and Asynchronous Motor, current movement control are generally used synchronous motor, its power range is large, can achieve a great power. LARGE INERTIA, low maximum rotation speed, and with the increase of power and rapid decline. Therefore, it is suitable for low-speed smooth operation of the application.

6. What should I pay attention to when using the motor?

The following checks should be made before power-on operation:

1)Power supply voltage is appropriate (overvoltage is likely to cause damage to the drive module) ; for DC input to the + /-polarity must not be misconnected, the drive controller motor model or current set value is appropriate (not too large at the beginning) ;

2)The control signal line is firmly connected, it is better to consider the shielding problem in the industrial field (such as using twisted pair) ;

3)Don't start by connecting all the wires you need to connect to the basic system, and then gradually connect when it's working well.

4)Be sure to know the grounding method, or not to use the air.

5)Start running within half an hour to closely observe the state of the motor, such as whether the movement is normal, sound and temperature rise, find problems immediately stop adjustment.

7, Stepping Motor start-up operation, sometimes move to a standstill or in situ to move back and forth, sometimes running out of step, what is the problem?

In general, the following aspects should be considered:

1)Whether the motor Torque is large enough to drive the load, therefore, we generally recommend that the user select a motor whose torque is 50% ~ 100% larger than the actual demand, because the stepper motor can not run under the load, even if it is instantaneous, it will cause the out-of-step, serious stop or irregular in-situ repeated movement.

2)If the current of the input step pulse from the upper controller is large enough (generally > Gt; 10ma) for the optocoupler to conduct stably, if the input frequency is too high to be received, if the output circuit of the upper controller is a CMOS circuit, cmos input-type drives are also preferred.

3)Whether the starting frequency is too high, whether the starting procedure is set to speed up the process, it is best to speed up from the motor within the prescribed starting frequency to the set frequency, even if the acceleration time is very short, otherwise it may be unstable, or even in idle state.

4)Motor is not fixed well, sometimes this situation, it is normal. Because, in fact, this time caused the strong resonance of the motor and led to the out-of-step state. The Motor must be secured.

5)For a 5-phase motor, the phase is misconnected and the motor does not work.

8. I want to control the SERVO motor directly by means of communication, OK?

Yes, and more convenient, but speed issues, for the response speed requirements are not too high applications. If fast response control parameters are required, it is best to use Servo motion control card, which usually has DSP and high-speed logic processing circuit to realize high-speed and high-precision motion control. Such as s acceleration, multi-axis interpolation and so on.

9. Use a switching power supply to power the stepper and DC motor systems?

Generally it is best not to, especially large torque motor, unless the power required to choose more than twice the switching power supply. Because, when the motor work is a large inductance type load, will form the instantaneous high voltage on the power supply side. But the switching power supply overload performance is not good, will protect off, and its precision voltage stability does not need, sometimes may cause switching power supply and drive damage. Can Use conventional ring or R type transformer transformer transformer transformer DC power supply.

10. I WANT TO USE 10V or 4 ~ 20mA DC voltage to control the stepper motor, ok?

Yes, but you need another conversion module.

11. I have a servo motor with encoder feedback. Can I control it with a servo drive only with a tachometer port?

Yes, need to be equipped with a encoder tachometer signal module.

12, Servo Motor Code Plate Part can be opened?

Do not open, because the code plate of Quartz is easy to crack, and into the dust, life and accuracy will not be guaranteed, need professional maintenance.

13. Can stepper and Servo motors be taken apart for overhaul or modification?

Do not, it is best to let manufacturers to do, after disassembling no professional equipment is difficult to install back to the original, the gap between the motor rotor can not be guaranteed. The magnetic steel material performance is destroyed, even causes the loss of magnetism, the motor torque drops greatly.

 14、Can Several servomotors be operated synchronously?

Our product is available.

15. Can the servo controller sense changes in the external load?

Our products are capable of stopping, returning, or maintaining a certain amount of thrust in the event of a set resistance.

16. Can we match the drive or motor made in China with the high quality motor or driver made abroad?

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

17. Is it safe to drive a motor with a DC supply voltage greater than the rated voltage?

Normally this is not a problem as long as the motor is operating within the set speed and current limits. Because the motor speed and motor line voltage is proportional, so select a certain power supply voltage will not cause overspeed, but may occur, such as the failure of the driver. In addition, the motor must meet the minimum inductance requirements of the driver, but also to ensure that the current limit set is less than or equal to the rated current of the motor.

In fact, it would be nice if you could make the motor run slower than the rated voltage in your device. Running at a lower voltage and therefore at a lower speed allows the brush to operate with less rebound, less brush / commutator wear, lower current consumption, and longer motor life. On the other hand, if the motor size limit and performance requirements require additional torque and speed, overdrive motor is also acceptable, but at the expense of product life.

18. How do I choose the right power supply for my application?

It is recommended to select a power supply voltage that is 10-50% higher than the maximum required voltage. This percentage varies with KT, Ke, and the voltage drop within the system. The current value of the drive should be sufficient to transmit the energy required for the application. Remember that the driver's output voltage is different from the supply voltage, so the driver's output current is also different from the input current. To determine the appropriate supply current, calculate all the power requirements for the application and increase them by 5% . According to the I P / V formula, the required current value can be obtained.

19. How are drives and systems grounded?

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

b. In most SERVO systems, all common ground and earth are connected at the signal end. Ground circuits that are connected in various ways to the earth are susceptible to noise and generate current at different reference points.

c. To keep the command reference voltage constant, connect the driver's signal to the controller's signal. It will also be connected to an external power source, which will affect the controller and drive work (E. G. encoder 5V power) .

d. Shielding layer grounding is more difficult, there are several ways. The correct shielded ground is at the reference potential point within the circuit. This point depends on whether the noise source and the receiver are grounded at the same time, or floating. Make sure that the shield is grounded at the same point so that no ground current flows through the shield.

20. Why doesn't the gearbox match the motor at the standard torque point?

If the maximum continuous torque generated by the motor through the reducer is taken into account, many reduction ratios will far exceed the torque rating of the reducer. If we were to design each reducer to match the full Torque, there would be too many combinations of internal gears, too much volume, too much material. This will make the product price is high, and violated the product 'high performance, small size' principle.

21. How do I choose between planetary and spur gear reducers?

Planetary reducers are generally used in limited space when high torque is required, that is, small volume of large Torque, and its reliability and life are better than spur gear reducers. Spur gear reducers are used for low current consumption, low noise and high efficiency low cost applications.

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