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Electric actuator has fallen off

2016-03-07View Original

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The electric actuator fails to function properly. Changhui Instruments: http%3a//www%2eyunrun%2ecom%2cn. The inertia of the electric actuator comes from the motor and the gear rotation system. The inertial torque generated by the rotation of the motor is generally small ; The inertia generated by the rotation of the gear transmission mechanism is relatively high; the rotational inertia of the gears is proportional to their speed and mass. If one of the gears in the gear transmission mechanism is designed to be larger, the inertia will increase. In the case of domestic DKJ electric actuators, the inertia arises mainly from one of the larger gears. When inertia causes the output shaft of an electric actuator to move beyond the amount specified by the control command, this is referred to as the actuator drifting. The failure of electric actuators is harmful to automatic control. The ability of electric actuators to prevent slipping refers to their capacity to resist slipping without the use of specialized braking mechanisms, relying instead on the friction generated during the transmission process, as well as the static inertia of the motor and the transmission mechanism; this capacity is amplified through the gear ratio. The electric actuator serves to transmit motion, reduce speed, and increase torque; it also amplifies the motor’s driving torque as well as the friction and inertia on the motor side. The ideal operating condition of an electric actuator is such that, at the moment the motor starts, it should be able to overcome its static inertia ; At the moment the motor stops, it is desired that the motion inertia be as low as possible ; When the electric actuator is at rest, it is desirable that it have a large inertial force to overcome external disturbances. Straight-stroke electric actuators generally use a transmission system that combines gear reduction with worm gear mechanisms. The worm gear mechanism converts angular displacement into linear displacement, while also possessing a certain degree of self-braking capability. The rotational inertia of the gear reduction mechanism itself is transmitted from the turbine to the worm, and therefore the inertia of the gear reduction mechanism can cause the linear actuator to drift. Most angular travel electric actuators use gear drives. The braking capacity of angular stroke electric actuators is inferior to that of linear stroke electric actuators, and a dedicated braking function should generally be added.

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