BENTLY 140734-05 Thermocouple output card

The maximum inertia for any given system is predominantly limited by the required system performance and the mechanical system. Inertia affects system performance in two ways. 1. It limits response because torque is required to accelerate an inertial load. Larger inertia will require larger torque to accelerate. Acceleration is a measure of performance, and is limited by the motor and drive combination. If the load to motor inertia ratio is very large, you will not be able to accelerate the load inertia quickly, and this limits response to speed changes or speed disturbances.

. Large inertial loads limit available continuous

 torque because the velocity loop gain needs to be larger for larger inertial loads. Large values of velocity loop gain amplify velocity feedback noise as current commands. The current ripple, due to velocity feedback noise, increases measured rms current and component temperature. Inertia affects the mechanical system by requiring a proportionally stiff load to motor coupling to maintain a given system bandwidth. A directly coupled load can have higher inertia ratios than a belt system due to stiffness of the coupling device. When coupling stiffness is lowered, the system’s natural resonant frequency is lowered. If the system’s natural resonant frequency is lowered close to the velocity bandwith crossover frequency, then the mechanical system may be exited by noise in the velocity loop. Under certain conditions, the mechanical system will resonate.

Mechanical Resonance 

There is always a mechanical natural resonant frequency. It is only a problem if it becomes excited. To reduce the possibility of excitation, mechanical systems should be designed with very high natural resonant frequencies. If the natural resonant frequency is much greater than the servo loop bandwidth, there will be no problems. The mechanical natural resonant frequency is dependent upon drive train coupling stiffness and load + motor inertia ratio. In order to increase the mechanical system natural resonant frequency either decrease total system inertia or increase coupling stiffness.

                                                                        

Brand display

 ABB、GE/FUANC、FOXBORO、TRICONEX 、BENTLY、A-B、EMERSON 、MOTOROLA、XYVOM、HONEYWELL 、REXROTH、KUKA、NI、DEIF、Yokogawa、WOODWARD、Reliance Electric、SCHNEIDER 、MOOG、PROSOFT、KOLLMORGEN、ICS TRIPLEX、HIMA

This article from the temporal Ming sheng automation equipment co., LTD., reproduced please attach this link: http://www.stockdcs.com/