When the motor is driven by a power frequency power supply, the voltage decreases and the current increases; for the inverter drive, if the voltage also drops when the frequency drops, does the current increase? When the frequency drops (low speed), if the output is the same power, the current incre

What is the difference between voltage and current? The main circuit of the converter can be divided into two types: the voltage mode is to convert the DC of the voltage source into the AC converter, and the filter of the DC loop is the capacitance. Current mode is a converter that converts the curr

What is a converter? Frequency converter is a power control device which converts the power frequency power supply to another frequency by using the on-off action of the power semiconductor device. What is the difference between PWM and PAM? PWM is the abbreviation of Pulse Width Modulation, which c

The expansion of the capacitor shell in operation is due to the dissociation of the insulating material inside the capacitor, the breakdown of gas or the breakdown of some elements into the discharge of the shell, etc., which increases the internal pressure of the sealed shell of the capacitor. Caus

(1) The relevant capacitors should be tested and checked, and the reasons should not be found out, and the electric power is not allowed to be forcibly transmitted after the fuse is replaced;(2) Pay attention to the standard of fuse installation and select the fuse with qualified quality;(3) The fus

(1) Fuse fuses caused by internal faults of capacitors;(2) Non-standard installation of capacitor fuses or poor fuse quality, resulting in overheated fuse breaking;(3) Unreasonable selection of capacitor fuse (4) Overcurrent caused by high harmonic current in power grid leads to fuse breakage.

With the digital multimeter check, the digital multimeter is set to the appropriate resistor file, the red meter pen and the black meter pen contact the two poles of the measured capacitor respectively. At this point, the display value will gradually increase from 000 until the overflow symbol "1" i

An index multimeter can also be used to measure the capacitance of a digital meter. If you use an index multimeter, you usually use the R × 1K file to connect the pen to the two poles of the capacitance. The multimeter pointer wobbles and slowly recovers to or near zero. Such capacitors are good. Th

The most direct and simplest method: connect directly with 220V AC, you can connect one pole first, touch another capacitor foot with another power line. If there is a clear little spark at the time of the touch, it is certain that the capacitor is charged, that is, the capacitor is not broken.

Error analysis of measuring positive dizzying AC voltage with multimeter distortionWhen the effective value of distorted sinusoidal voltage with harmonic component is measured by multimeter (AC voltage range is mean meter), the measurement error depends not only on the amplitude of each harmonic, bu