Large-sized Vertical Lathe Case - INVT GD300 Series Vector Control Inverter

The System Controls Main-shaft Motor with One GD300-075G-4 Frequency Inverter

A large-sized vertical lathe is a CNC digitally controlled lathe. Generally parts for machining with this kind of lathes is large and power for its main shaft is big.

Electric drive condition: Max. cutting radius for part to be machined is no more than 6300mm;power of main-shaft motor:55KW;rated frequency:16.7Hz; fluctuation for rotation speed is less than 1RPM and current fluctuation is less than 1A when the motor is at 70HZ weak magnet operation.The system controls main-shaft motor with one GD300-075G-4 frequency inverter, and brake unit and brake resistor are set externally.In terms of starting method, terminal start is adopted; speed feed is to give a 0-10V analog quantity voltage control signal to the frequency inverter through CNC control system;

The optimized open-loop vector control algorithm achieves excellent control effect, featuring excellent control effect, big low frequency torque, quick dynamic response and powerful stable-speed performance.Excellent current limiting property and strong overload capability can effectively reduce variable frequency overload and over-current protection and guarantee continuity of production to maximum;Outstanding AVR function and extra-strong grid adaptability, and it can be used in poor power supply occasions such as long-term low voltage and fluctuation of grid, ensuring stability of output voltage, current and speed.Good environment adaptability, independent air duct design and flange mounting mode can greatly improve grease, dust powder and humidity and heat resistance capability.The unique weak magnet control technology ensures commonly used low frequency and big torque motor (with basic frequency of 33.3 Hz) to run at a rate of 0-200Hz.