Servo motor level sensors are typically quite large and are generally not suitable for dynamic pressure measurement or physical adverse environments, but are well-suited for high-precision and high-resolution pressure measurement in more favorable physical environments.
The servo motor accelerometer provides an illustration, showing a relaxed, high-permeability mass suspended on the door hinge. "Down" or "zero position" is detected by a zero detector, and the interaction force is provided by a magneto-coil.
Servo motor accelerometer
If a momentary velocity is applied to this component, a force will be applied to the mass, and it will attempt to move from the zero position. When the zero detector detects the movement, the current in the electromagnetic coil is increased by the servo motor amplifier to maintain the zero position.
The current in the electromagnetic coil provides the restoring force needed to maintain the zero position, and this current is proportional to the instantaneous velocity of release.
High-precision zero detectors can be manufactured very easily because the total range of this offset is very small. In fact, increasing the number of pixels in the zero detector will result in a relative increase in the instantaneous speed of the pixels.
Because the active components of a servo motor accelerometer do not exhibit significant deviations during normal operation, the lag characteristics of this type of controller are extremely low. The main reason for this lag is electrical lag in the power circuit, rather than actual mechanical lag. Vibration damping in earthquake-resistant equipment is achieved using methyl silicone oil on both electrical and mechanical components.
Compared to strain gauge accelerometers, servo motor accelerometers feature microgravity pixels with high zero-Hz reliability and low thermal deviation. A few inches of inertial mass can generate significant forces during high-impact events, and even in high-impact environments, this type of controller may withstand long-distance impact termination; however, it is not suitable for high-impact environments.
Initially, the force balance controller employed piezoelectric or magnetic "vibration" mechanisms to reduce viscous effects by continuously applying slight oscillations to the rolling bearing, thus maintaining its frictional resistance within a low dynamic range. Recent designs utilize a high-resolution zero-hysteresis system, eliminating the need for simple calcite bending and completely replacing the rolling bearing. The excellent structural mechanical properties of crystalline calcite, as a pivot, provide essentially zero-hysteresis performance due to the lack of significant quality shift.
Servo accelerometers typically have a flat (±5%) phase frequency response network bandwidth usually below 100Hz. Based on feedback control networks, compared to strain gauge open-loop accelerometer designs, the recovery time of a servo accelerometer from input beyond the measurement range can be very long. In fact, the recovery time of the controller after input during the entire process can be represented by a direct function of the total output power.
Typical servo motor controllers typically use 50 or 100mA of input drive current as the limit, thus "limiting" the resulting restoring force mechanism.
The typical over-recovery time is 100ms. The high quality of this type of sensor makes the equipment highly insensitive to thermal transients.
Servo motor level sensor
The figure shows how the servo motor definition described above is applied to the manufacture of ultra-precise liquid level sensors .
Servo motor level sensors are typically quite large and are generally not suitable for dynamic pressure measurement or physical adverse environments, but are well-suited for high-precision and high-resolution pressure measurement in more favorable physical environments.
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