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Selection of servomotor type 2

Date: 2020-08-10
Clicks: 604
Date: 2020-08-10
Clicks: 604

What kind of equipment do you make? Which brand of Servo motor are you going to use? Choice of Servo type selection calculation method? I believe that many customers encounter similar problems, today to add some simple servo type selection method.

   In the practical application of mechanical and electrical industry, some complex motions are often encountered, which have a great impact on the dynamic load of the motor. Servo drive is the core of many electromechanical systems, so the choice of servo motor becomes very important. First of all, it is necessary to select the motor that meets the requirements of a given load, and then select the most suitable motor according to price, weight, volume and other technical and economic indicators.


Servo motor type selection calculation method:
   1. Speed and encoder resolution validation.     

   2. Conversion of load torque on motor shaft and calculation of acceleration and deceleration torque. 

   3. Calculate the load inertia, inertia matching, Yasukawa servo motor as an example, part of the product inertia matching up to 50 times, but the actual smaller the better, so on the accuracy and response speed.     

   4. Regenerative resistance calculation and selection, for Servo, generally more than 2kw, to external configuration.    

  5. Cable Selection, encoder cable twisted shield, for Yaskawa Servo and other Japanese products absolute value encoder is 6 core, incremental is 4 core.

   For Linear motion, the Velocity v T, the acceleration a t and the required external force F t are used. For rotational motion, the angular velocity t, the angular acceleration t and the required torque t are used, they can all be expressed as a function of time, independent of other factors. Apparently. The maximum power of the motor, the motor P, should be greater than the peak power p required by the load, but this is not enough. The physical power consists of torque and speed, but in a real transmission they are limited. In terms of peak, t peak represents the maximum or peak. The maximum speed of the motor determines the upper limit of the speed reduction ratio of the reducer, the peak value of the upper limit N, and the maximum / peak value of the speed reduction ratio. Similarly, the maximum torque of the motor determines the lower limit of the speed reduction ratio, and the lower limit n, the peak value t / t of the motor, is the maximum if the lower limit N is greater than the Upper Limit N, the motor chosen is not suitable. On the contrary, the feasible range of transmission ratio between upper and lower limits can be determined by extensive analogy of each kind of motor. It is not enough to use only peak power as the principle of selecting motor, and the accurate calculation of transmission ratio is very complicated.

New Method of selection
   A new selection principle is to separate the motor characteristics from the load characteristics and to express them graphically, which makes it easier to check the feasibility of the drive and to compare the different systems, a possible range of transmission ratios is also provided. The advantages of this method are: it is suitable for all kinds of load cases; it separates the load from the characteristics of the motor; and all the parameters related to the power can be expressed graphically and are suitable for all kinds of motors. Therefore, it is no longer necessary to use a large number of analogies to check whether the motor can drive a particular load.    

   The transmission ratio between the motor and the load changes the dynamic load parameters provided by the motor. For example, a large transmission ratio reduces the effect of external torque on the operation of the motor, and, in order to output the same motion, the motor has to rotate at a higher speed, producing greater acceleration, so the motor requires greater inertia torque. Choosing the right transmission ratio can balance these two opposing aspects. In general, there are two ways to find the drive ratio N, which will coordinate the motor and the task well.

   First, the maximum speed obtained from the motor is less than the maximum speed of the motor itself, the motor is maximum;

   Second, the motor at any time the standard Torque is less than the rated torque m rated motor.

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