An explosion proof motor is clearly marked with a nameplate that identifies its suitability for a given hazardous environment. The nameplate will indicate the hazardous Class, Division, and Group for which the motor is suited.
Electric motors generate heat under normal operating conditions and have the potential to generate a spark if a motor coil fails. Excessive motor case temperatures or a spark that is not properly contained can cause an explosion or ignite a fire in environments where specific hazardous materials are present.
There are several considerations when selecting a direct drive linear actuator for a specific application, such as the required speed, force, motion profile, available physical envelope, and environmental factors. This means the chosen actuator solution must produce the load force and speed requirements, fit in the available space, and perform as required under the subjected environmental conditions of the application.
A direct drive linear actuator, using a permanent magnet linear servo motor produces force and velocity based on the supplied current and voltage and provides a linear movement along the axis being driven. The linear servo motor works as part of a closed loop system providing force and velocity as commanded from a servo controller utilizing feedback to close the loop. In simple terms, a linear servo motor behaves identically as a rotary servo motor – it’s just rolled out flat and straight.
Amplitude gain margin is a measurement in the frequency domain, taken from a Bode plot, that takes the amplitude below 0 dB at the lowest frequency point that the phase reaches -180 degrees (phase crossover frequency).
A stable servo system is essential for optimal machine performance, durability, safety, and consistent machine performance, which improves overall machine operation. Servo systems operate in various degrees of stability, with a fine line between stable and unstable. Changes in the mechanical system over time or machines with varying loads can move the system from a stable to unstable operating condition. This article unveils four key values that determine the stability level of a servo system.