MITSUBISHI inverter FR-D720 series.
Voltage level: three phase 200V.
Frequency converter capacity: 1.5KW.
Vector control variable frequency speed control is the practice of the asynchronous motor in the three-phase coordinate system of the stator current Ia, Ib, Ic, through the three-phase to two-phase transformation,
The alternating current of Ia1Ib1 is equivalent to a two phase stationary coordinate system, and then is rotated by the rotor field oriented,
Equivalent to the DC current Im1, It1 (Im1 equivalent to DC motor excitation current in synchronous rotating coordinate system;
It1 equal to the armature current proportional to the torque, and then imitate the DC motor control method, to obtain the DC motor control,
The control of asynchronous motor is realizzed through the corresponding inverse coordinate transformation FR-F740P-15K-CHT PDF FR-F740P-15K-CHT PDF FR-F740P-15K-CHT Manual FR-F740P-15K-CHT Can be isolated from the output of the programmable controller, the a/b/c contact relay, SSR, Tr output FR-F740P-15K-CHT PDF. Analog input expansion board (2 channel).MITSUBISHI inverter FR-D720S series.
Voltage level: single phase 200V.
Frequency converter capacity: 0.75KW.
VVVF frequency control, vector control frequency conversion, direct torque control is a kind of AC - DC - AC frequency conversion MITSUBISHI Instruction 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 MITSUBISHI Instruction manual. 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 ffactor of L, the input current is sinusoidal and can run in four quadrant, the power density of the system is large MITSUBISHI Instruction manual FR-F740P-15K-CHT Instruction manual.
Although the technology is not yet mature, but still attract a large number of scholars in-depth study FR-F740P-15K-CHT Manual .
In fact, the quality is not the indirect control current, flux, but the torque is directly used as the control to achieve.