A stepless speed regulating device for CNC machine tool workbench or spindle

Abstract

The invention relates to a stepless speed regulation device for a working table or a spindle of a numerical control machine tool. The device comprises a speed regulator, a current regulator, a triangular wave generator, a pulse width modem, a transistor amplification circuit, a current signal amplifier and a speed measurement feedback circuit. The speed regulator, the current regulator, the pulse width modem and the transistor amplification circuit are connected sequentially. The triangular wave generator is connected with the pulse width modem, the input end of the current signal amplifier is connected with the output end of the transistor amplification circuit, the input end of the current signal amplifier is connected with the input end of the current regulator, and the speed measurement feedback circuit for measuring the rotation speed of a motor is connected with the input end of the speed regulator. The device has the advantages that the bandwidth is wide, and the frequency is high; the transistor 'junction capacitance' is small, and the rapidity is good; the current pulsation is small, and the power factor of a power supply is high; a direct-current power supply of a PWM system is uncontrolled rectification output, the power factor is good, and the dynamic hardness is good.

Description

technical field [0001] The invention belongs to a stepless speed regulating device for the workbench or main shaft of a numerical control machine tool, which is suitable for use in the field of numerical control machine tools, in particular to a circuit for stepless speed regulating of the main shaft of a machine tool. Background technique [0002] Numerical control technology is an important basic industry that reflects the level of the country's comprehensive national strength, and the numerical control rate of machine tools is the core symbol to measure the modernization degree of a country's manufacturing industry. However, the lack of guarantee of CNC machining accuracy has directly and seriously affected the development of my country's manufacturing industry. At present, in order to improve the machining accuracy of the CNC system of machine tools, the production of high-precision and high-level parts plays a vital role in various industries, so designers must improve ...

AI Technical Summary

Problems solved by technology

Existing speed control devices for machine tools have complex structures, high power consumption, large pulsating components in the output current provided, intermittent current phenomena, and large runaway time and dead zone voltage, which limits the frequency band of the system Broadband and speed regulation range seriously restrict the development of my country's manufacturing industry

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