Frequency converter selection: In general, the selection of frequency converter must be based on the actual working current of the motor to select the corresponding frequency converter. Of course, if you can not find the most suitable in a short time, you can also choose a larger model, because the large frequency converter can take a small motor, but the small frequency converter must not move the large motor!
The significance of frequency converter resolution: For a digitally controlled frequency converter, even if the frequency instruction is an analog signal, the output frequency is also given. The smallest unit of this difference is called the frequency conversion resolution. The frequency conversion resolution is usually 0.015~0.5Hz; For example, the resolution is 0.5Hz, then the above 23Hz can be changed into 23.5, 24.0Hz, so the motor action is also a step to follow.
The principle of regenerative braking of the motor: when the rotor speed of the motor exceeds the rotation speed of the synchronous magnetic field of the motor, the rotation direction of the electromagnetic torque generated by the rotor winding is opposite to the rotation direction of the rotor, at this time, the motor is in a braking state, this state is called regenerative braking.
How to get greater braking force: The energy generated from the motor is stored in the filter capacitor of the inverter, due to the relationship between the capacity of the capacitor and the voltage resistance, the regenerative braking force of the general inverter is about 10% to 20% of the rated torque. If the optional brake unit is used, it can reach 50% to 100%.
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