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Test Application of Power Amplifier in Magnetic Bearing System

发布:2021-05-25

Electromagnetic bearing is a support element that uses controllable electromagnetic force to suspend the rotor without contact. It has a wide range of applications in the field of high-speed rotating machinery. In the electromagnetic bearing system, the power amplifier provides the corresponding control current to the electromagnet coil. Generating the required electromagnetic force plays an important role in the characteristics of the system.

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In the electromagnetic bearing system, the function of the power amplifier is to convert the control signal output by the controller into the large current required by the electromagnet, so as to provide power for the electromagnetic bearing suspension rotor. The ATA3090 power amplifier introduced by Aigtek has a frequency range of DC-100KHz, an output current of 18A, and a digitally adjustable voltage gain of 0~30 times. It can be divided into two types: coarse adjustment (1step) and fine adjustment (0.1 step).

The electromagnetic bearing system is composed of the electromagnetic bearing body/displacement sensor, controller and power amplifier. The displacement sensor detects the position status of the suspended rotor and feeds back the position information to the controller. The controller generates corresponding control signals according to different control laws, and then converts the control signals into control voltage or control current through the power amplifier, which acts on the electromagnetic The bearing coil generates the electromagnetic force needed to suspend the rotor, so that the rotor can reach a stable suspension.

The power amplifier is a key part of the electromagnetic bearing system. The main loss of the electromagnetic bearing system is generated by the power amplifier, and the electronic bearing requires the operating frequency from zero to several kilohertz. ATA-3090 is an ideal device that can amplify AC and DC signals. Power amplifier. The maximum output power is 810Wp and the output current is 18A, which can drive power-type loads. LCD screen display, one-key saving of commonly used settings, provides convenient and simple operation options, and can be used with mainstream signal generators to achieve perfect signal amplification. Provide the large current and power required by the electromagnet.

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Power amplifiers can be used to drive capacitive and inductive loads, piezoelectric ceramics, magnetic field coils, and ultrasonic transducers. Generally, if AC power is used to drive a load containing capacitors or inductive coils, it will cause a reverse current from the load side . In this case, it may not be able to drive with a normal power supply. However, if a power amplifier is used for driving, the required high voltage and large current can also be achieved. Therefore, it is possible to stably operate (output) even for capacitive and inductive loads such as piezoelectric elements and inductors.

Xi'an Antai Electronic Technology Co., Ltd. (Aigtek) is a domestic high-tech enterprise specializing in R&D, production and sales of measuring instruments. The company is committed to the research of related industry test solutions with power amplifiers, measurement calibration products, wiring harness testers and other products as the core, and provides users with competitive test solutions.

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