Alternating current frequency conversion control method suitable for vibrating stress relief

Abstract

The invention discloses an alternating current frequency conversion control method suitable for vibrating stress relief (VSR). The method is characterized in that: a lower computer arranges a function baud table according to a sine function that is expressed by the following formula: y=A(sinX+ksin3X), so that an alternating signal of a drive power module of the lower computer contains a triple-frequency harmonic; when an upper computer gives a rotate speed instruction to the lower computer, the lower computer invokes a point in an array according to an order to output a sine wave; and an alternating current signal of a control power module is a drive square wave of the power module, wherein the drive square wave is output after the lower computer automatically searches a function baud table according to a register shift method. According to the invention, an operation method of a lower computer is changed and thus a stead speed of a rotating speed of a single-chip computer is improved; therefore, lost of resources for operation of a sine function are saved for the single-chip computer; a CPU processing speed is enhanced; a steady-speed velocity is substantially improved; an influence on bus output by a self-inductance higher harmonic is reduced; delay and dead zone loss of a power module switch are compensated; driving capability of the power module is effectively improved; and a requirement of a VSR technology is met.

Description

technical field [0001] The invention relates to a frequency conversion control method used in vibration aging of an AC motor. Background technique [0002] Vibrating Stress Relief (VSR for short) aims to resonate the processed workpiece through professional vibration aging equipment, and transmit a certain vibration energy to all parts of the workpiece through this resonance method, so that the inside of the workpiece Microscopic plastic deformation - the distorted lattice gradually returns to the equilibrium state, and the dislocations slip and pin again, so that the residual stress inside the workpiece can be eliminated and homogenized, and finally prevent the deformation and cracking of the workpiece during processing and use , to ensure the stability of the dimensional accuracy of the workpiece. [0003] The traditional vibration aging is to use the rotation of the brushed DC motor to drive the eccentric block of the exciter fixed on the workpiece to generate periodic e...

AI Technical Summary

Problems solved by technology

In this method, only the speed signal collected by the speed sensor cannot obtain the amplitude and phase of the higher harmonic of the motor, so the output voltage increment coefficient K cannot be determined

That is, the method is not possible

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