33VM52-000-29 直流控制电机 PACIFIC VME惯量电机

33VM52-000-29 直流控制电机 PACIFIC VME惯量电机

伺服电机是自动化控制系统中的一种常见的电气元件，选择伺服电机除了要考虑功率、力矩、转速、运行模式、控制方式、输入输出电压之外，还需要考虑伺服电机的惯量对控制系统的影响！对于电机的加减速来说相当重要。如果不能很好的匹配惯量,电机的动作会很不平稳。

▄ 什么是惯量

惯性：保持原来运动状态或者静止状态的性质叫惯性。转动惯量：保持原来匀速圆周运动状态或者静止状态的能力。它的大小与物体质量成正比。

▄ 低惯量与高惯量

伺服电机的惯量由转子自身的质量，PACIFIC 太平洋科学 33VM52-000-29 VME惯量电机以及外加的负载而组成。惯量越大，物体的运动状态越不容易改变。无论旋转运动的部件，还是直线运动的部件，都成为电机的负载惯量，它们的大小有不同的计算方法，因为计算公式较多，就不一一列举。

▄ 惯量对伺服电机运行的影响

电机轴上的负载惯量大小，对电机的灵敏度和整个伺服系统的精度将产生很大的影响，通常，当负载小于电机转子惯量时，上述影响不大。但当负载惯量达到甚至超过转子惯量的5倍时，会使伺服放大器不能在正常调节范围内工作。所以对这类惯量应避免使用。所以在设计负载时，应尽可能地减小体积和重量。

转动惯量=转动半径*质量

低惯量就是电机做的比较扁长，PACIFIC 太平洋科学 33VM52-000-29 VME惯量电机主轴惯量小，当电机做频率高的反复运动时，惯量小，发热就小。所以低惯量的电机适合高频率的往复运动使用。但是一般力矩相对要小些。一般来说，小惯量的电机制动性能好，启动，加速停止的反应很快，高速往复性好，适合于一些轻负载，高速定位的场合,如一些直线高速定位机构。

高惯量的伺服电机就比较粗大，力矩大，适合大力矩的但不很快往复运动的场合。因为高速运动到停止，驱动器要产生很大的反向驱动电压来停止这个大惯量，发热就很大了。中、大惯量的电机适用大负载、平稳要求比较高的场合，如一些圆周运动机构和一些机床行业。

33VM52-000-29 直流控制电机 PACIFIC VME惯量电机

Servo motor is a common electrical component in the automatic control system, the selection of servo motor in addition to considering the power, torque, speed, operation mode, control mode, input and output voltage, but also need to consider the servo motor inertia on the control system! It is very important for the acceleration and deceleration of the motor. If the inertia is not well matched, the motor's action will be very unstable.

▄ What is inertia

Inertia: The property of maintaining the original state of motion or static state is called inertia. Moment of inertia: The ability to maintain a state of constant circular motion or a state of rest. Its size is proportional to the mass of the object.

▄ Low and high inertia

The inertia of the servo motor is composed of the mass of the rotor itself, the PACIFIC Pacific Science 33VM52-000-29 VME inertia motor and the applied load. The greater the inertia, the less easily the motion state of the object can be changed. Whether the rotating motion parts, or the linear motion parts, have become the load inertia of the motor, their size has different calculation methods, because the calculation formula is more, it is not listed.

▄ Effect of inertia on servo motor operation

The size of the load inertia on the motor shaft will have a great impact on the sensitivity of the motor and the accuracy of the entire servo system, usually when the load is less than the inertia of the motor rotor, the above effect is not large. However, when the load inertia reaches or even exceeds 5 times the rotor inertia, the servo amplifier can not work in the normal adjustment range. Therefore, this kind of inertia should be avoided. Therefore, when designing the load, the volume and weight should be reduced as much as possible.

Moment of inertia = radius of rotation * mass

Low inertia is the relatively flat length of the motor, PACIFIC Pacific Science 33VM52-000-29 VME inertia motor spindle inertia is small, when the motor does repeated motion with high frequency, the inertia is small, the heat is small. Therefore, the low inertia motor is suitable for high frequency reciprocating motion. But the general torque is relatively small. Generally speaking, the motor with small inertia has good braking performance, the reaction of starting and accelerating to stop is fast, and the high-speed recovery is good, which is suitable for some light load and high-speed positioning occasions, such as some linear high-speed positioning mechanisms.

The servo motor with high inertia is relatively coarse and the torque is large, which is suitable for the occasion of large torque but not very fast reciprocating movement. Because of the high-speed movement to stop, the driver has to produce a large reverse drive voltage to stop this large inertia, and the heat is very large. Medium and large inertia motors are suitable for large loads and high stable requirements, such as some circular motion mechanisms and some machine tool industries.

33VM52-000-29 直流控制电机 PACIFIC VME惯量电机