Application of the ES500A in Machine Tool Spindle Positioning

Electric spindle is a new technology emerging in the field of CNC machine tools, which integrates the machine tool spindle with the spindle motor. The main drive system of high-speed CNC machine tool cancels the belt wheel drive and gear drive. The main shaft of the machine tool is directly driven by the built-in motor, which realizes the "zero transmission" of the machine tool. This spindle motor and the machine tool spindle "two into one" transmission structure form, known as"electric spindle"

EPSIVO ES500A series frequency converter adopts leading high-speed DSP and advanced flux algorithm, and has the following characteristics to meet the requirements of electric spindle cutting:

• Wide speed regulation range, maximum frequency 1000Hz

• High low frequency torque, 0.5Hz150% rated torque output, good low speed cutting effect

• Precise control, improved production efficiency, fast speed response, acceleration and deceleration of 0.5s

• Strong anti-load sudden change ability, when the instantaneous current reaches 180% of the rated current, it can maintain normal operation for 3 seconds

• Effectively reduce cost and energy consumption

Application Cases

Based on the requirements of numerical control system and machine tool design, ES500A series 7.5KW and 11KW vector type frequency converters are adopted on site, which are applied to the spindle drive system of lathe to drive 7.5kW common three-phase asynchronous motor for spindle speed control. The numerical control device of the machine tool and the frequency converter assist each other, and the spindle motor operates normally by setting appropriate parameters.