MITSUBISHI inverter FR-F720 series.
Voltage level: three phase 200V.
Frequency converter capacity: 2.2KW.
When the inverter is running, the starting current and starting torque of the motor are how?
With the operation of the inverter, with the acceleration of the motor to improve the frequency and voltage,
The starting current is limited to 150% below the rated current (according to the different types of aircraft, 125%~200%) FR-A820-7 FR-A820-7.5K-15K-1 PLC FUNCTION Manual FR-A820-7.5K-1 Programming Manual.
Starting with power frequency power supply, the starting current is 6~7 times of the rated current, therefore, the impact on the mechanical and electrical.
The inverter drive can be smoothly start (start time longer).
The starting current is 1.2~1.5 times of the rated current, and the starting torque is 70%~120% rated torque;
For the inverter with the torque automatic enhancement function, the starting torque is more than 100%, which can start with full load FR-A820-7.5K-1 PLC FUNCTION Manual FR-A820-7.5K-1 Programming Manual. MITSUBISHI inverter FR-D720S series.
Voltage level: single phase 200V.
Frequency converter capacity: 0.4KW.
VVVF frequency control, vector control frequency conversion, direct torque control is a kind of AC - DC - AC frequency conversion FR-A820-7.5K-1 PLC FUNCTION Manual FR-A820-7.5K-1 Programming Manual.
The common drawback is that the input power factor is low, the harmonic current is big, and the DC circuit needs large energy storage capacity,
Renewable energy and can not be fed back to the power grid, which can not be carried out in the four quadrant operation. To this end, the matrix type of AC - AC variable frequency arises at the historic moment.
Because the matrix type alternating current frequency saves the intermediate DC link, thereby, the electrolytic capacitor with large volume and high price can be omitted.
It can achieve a power factor of L, thhe input current is sinusoidal and can run in four quadrant, the power density of the system is large FR-A820-7.5K-1 PLC FUNCTION Manual FR-A820-7.5K-1 Programming Manual.
Although the technology is not yet mature, but still attract a large number of scholars in-depth study FR-A820-7.5K-1 PLC FUNCTION Manual FR-A820-7.5K-1 Programming Manual.
In fact, the quality is not the indirect control current, flux, but the torque is directly used as the control to achieve.