A servo drive device with a rotary transformer as a sensor

Abstract

The invention provides a servo drive device with a rotary transformer as a sensor. The servo drive device comprises a permanent magnet synchronous motor, a rotary transformer, a decoding circuit, anda servo driver. The rotary transformer is fixed to the rear end of an output shaft of the permanent magnet synchronous motor and the decoding circuit and the servo driver are fixed to a PCB which is connected with a power source; the power source is electrically connected with the decoding circuit and the servo driver; the decoding circuit is electrically connected with the rotary transformer; theservo driver is electrically connected with the permanent magnet synchronous motor. The servo drive device has the advantages of simple structure, stable performance, abrasion reduction, long servicelife, great adaptability, wide working range and good market application value.

Description

technical field [0001] The invention relates to the field of servo drive, in particular to a servo drive device using a resolver as a sensor. Background technique [0002] Industries such as electric vehicles, industrial automation, robotics, textile machinery, and aerospace all rely on high-performance control of servo drives, which require motor rotation angle sensors and often require high-temperature applications. [0003] Currently, photoelectric angle encoders are widely used because they can easily detect the rotation angle of motors. However, this kind of photoelectric angle encoder contains photoelectric components and semiconductor devices, so it cannot be used in high temperature environments. [0004] A resolver is a sensor that can detect rotation angles. Since it does not use a photoelectric conversion device, it can be used in a higher temperature environment. However, there are many disadvantages in the current resolver: Most of the reluctance resolvers on t...

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Problems solved by technology

However, there are many shortcomings in the current resolver: most of the reluctance resolvers on the market are P opposite poles (P ≥ 21), and the resolver rotor rotates once will generate a signal of P periods as the output signal of the resolver , in the case of the same signal output, the positions of P rotors will appear; secondly, the toroidal transformer in the market can also determine the absolute position of the rotor, but this kind of transformer has a complex structure, many manufacturing processes, and the rotor needs to be wound, which is reliable The performance is not as good as the reluctance resolver; finally, the encoder occupies a very important position in the position sensor, but the encoder has extremely high requirements on the working environment, and it loses its advantages in some complex working conditions.

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