Electromagnetic Balance Accelerometer

An acceleration sensor, balanced technology, applied in the direction of acceleration measurement using inertial force, etc., can solve the problems of poor impact resistance of flexible pendulum acceleration sensor, support body is easily affected by resistance, etc., to achieve no inter-axis interference, anti The effect of high impact performance and high zero position stability

CN104280571BInactive Publication Date: 2016-09-14CHONGQING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-09-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

An electromagnetic balance type acceleration sensor comprises a torquer system, a signal sensing system, a servo amplification system and an outer supporting structural body. One side of a torquer rotor is fixed to the outer supporting structural body through a wire, when accelerated speed is input in the sensitive axial direction, the torquer rotor rotates by a small angle with the wire as the fulcrum, a displacement metal sheet fixed to the edge of the torquer rotor generates relative displacement relative to the balance position, the relative displacement is fed back to the servo amplification system by being detected by a signal sensor and is converted to be current magnitude, current is fed back by a foil wire to a torquer moving coil, then ampere force is generated, and the torquer rotor recovers to the balance position under action of ampere force. The electromagnetic balance type acceleration sensor has the advantage of high-precision closed-loop control of a flexible pendulum acceleration sensor, and has the advantages of being high in zero-position stability, free of interference between shafts and the like; meanwhile, influence on material selection from temperature is relatively small, and the electromagnetic balance type acceleration sensor has a small bias temperature coefficient and has the miniaturization and low power consumption potentials.
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Description

technical field

[0001] The invention relates to an acceleration sensor, in particular to a closed-loop feedback control suspension wire supporting electromagnetic balance acceleration sensor based on differential displacement detection. Background technique

[0002] Traditional acceleration sensors are divided into piezoelectric, piezoresistive, capacitive, pendulum and so on. The piezoelectric acceleration sensor is a self-generating sensor, the output charge is proportional to the input acceleration, the relative size is small, and the life is long, but the signal needs to be greatly amplified, the sensor body is easily affected by temperature, and the zero bias is not ideal; The resistive type requires an external power supply to provide excitation, the measurement frequency can be as low as 0HZ, it can withstand high impact and has no zero bias, but the minimum resolution is relatively unsatisfactory; the capacitance area of ​​the capacitive acceleration sensor is limite...

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing, the work of the present invention is described in detail.

[0018] Such as figure 1 Shown is the top view of the electromagnetic balance acceleration sensor of the present invention. The electromagnetic balance acceleration sensor includes: a torquer stator (12) composed of permanent magnet groups (121, 122), a coil slot (111), a mover coil (112), a wiring board (113), a foil wire (114) and a displacement metal The torquer mover (11) composed of sheet (21), the torquer stator (12) and the torquer mover (11) form the torquer system (10). A signal sensing system (20) composed of a displacement metal sheet (21), a sensing coil (22) and a sinusoidal excitation signal generating circuit (23), a servo amplification system (30), and an external support structure (40). The permanent magnet groups (121, 122) are directly fixed on the external support structure (40) through the magnet fixing frame, and a distance (51) as small as ...