In order to meet the requirements of mechanical equipment of high precision, fast response, the rotational inertia of the servo motor should be smaller and larger locked-rotor torque, as much as possible and have a small time constant and the voltage, overload ability should also have a long time, in order to meet the requirements of high torque at low speed, able to withstand frequent starting, braking and positive and reverse, if blindly choose large size of the motor, not only increase the cost, also makes design equipment size, structure is compact, so choosing motor should give full consideration to all aspects of the requirements, in order to give full play to the performance of servo motor; Below is the principle of type selection of servo motor and the matters needing attention.
choose servo motor model of step 1, the specific load movement requirements, namely, add/deceleration speed, movement speed, the weight of the institution, institutional forms of exercise, etc. 2, accordance with the requirements of operating conditions used to choose appropriate load the calculation formula, calculates the load moment of inertia of the organization. 3, according to the load moment of inertia and the motor inertia choose appropriate false selected specifications. 4, combined with the primary motor inertia and load inertia, calculate the acceleration and deceleration torque torque. 5, according to the load weight, configuration mode, friction coefficient, efficiency to calculate the load torque. 6, the maximum output torque must be greater than the primary motor speed torque and load torque; If do not conform to the conditions, must choose other model calculation verification until it meets the requirements. 7, according to the load torque, acceleration, deceleration torque and torque holding torque, calculate the instantaneous torque in a row. 8, the primary motor rated torque must be greater than the instantaneous torque in a row, if is not in conformity with the conditions, must use the model is proved until it meets the requirements. 9, complete the selected.
1 servo motor selection calculation method, rotational speed and the confirmation of the encoder resolution. 2, of load torque on the motor axis conversion and deceleration torque calculation. 3, computational load inertia, moment of inertia of the match, yaskawa servo motor as an example, the partial products of inertia matching up to 50 times, but actually as small as possible, so good for precision and response speed. 4, regeneration of resistance calculation and selection, for servo, generally more than 2 kw, outside to configuration. 5, cable selection, encoder twisted-pair cable shielding, absolute value encoder for yaskawa servo plot of products is 6 core, incremental is four core. the above selection methods only consider the dynamic problem of the motor, linear motion with speed, acceleration and the external force, said for rotating with angular velocity, angular acceleration and torque required said they all can be expressed as the function of time, nothing to do with other factors. Obviously. Motor's maximum power P, P should be more than the workload of the largest peak power peak, but it is not enough to so, physical power contains two parts, the torque and speed but they are limited in the actual transmission mechanism. With a peak, T the maximum peak or peak said. The maximum speed of the motor determines the upper limit of the reducer reduction ratio, maximum n = peak, the largest/peak, similarly, the maximum torque of the motor for the lower limit of reduction ratio, n the lower peak = T/T motor, most, if n is greater than n upper limit, choice of the motor is not appropriate. On the other hand, will be for each motor to widely analogy to determine the feasible ratio between upper and lower range. Only peak power as the principle of choosing motor is inadequate, and the accurate calculation of the transmission ratio are very complicated.
how to choose the servo motor 1, first of all, you need to distinguish between common motor, such as servo motor, spindle motor, asynchronous motor, you need to understand why use servo motor, servo motor is generally used in the numerical control system, it can be controlled, can achieve a half closed loop control and closed loop control.
2, we commonly used servo motor manufacturer with Siemens, FANUC FANUC, there are some other manufacturers, but the selection process is the same, the selection of Siemens, for example.
3, first of all, need to calculate the load torque, the calculation of load torque need to calculate the working load, the load may be friction, also may be cutting force, will according to you an approximate calculation of mechanical systems. The load torque is the unit of N. M。 So need to know the rotation of the workpiece diameter (Radius)。
4, then according to the quality of workpiece rotational speed and load calculating the rotational inertia of the work piece. Then need to load torque and the moment of inertia of the artifacts into the main shaft of the moment of inertia and load torque.
