The frequency converter braking resistor, that is, the frequency converter braking resistor, has the following main functions:
1. A carrier used to consume the regenerative energy of the motor in the form of thermal energy, which includes the resistance value and power capacity, are two important parameters.
2. The brake resistor is mainly used to consume the energy generated when the servo motor brakes (emergency stop), otherwise the driver may be burned out.
3. When the motor or other inductive load driven by the frequency converter stops, this is usually achieved by energy braking, which involves combining the kinetic energy of the motor after stopping and the magnetic energy in the engine. coil. All are consumed by another energy-consuming component, thus enabling rapid parking.
Detailed information:
When the servo motor brakes, the servo motor is in a power generation state. This means that the energy will be returned to the DC bus of the servo motor. Since the DC bus contains capacitance, the DC bus voltage will increase.
The magnitude of the voltage increase depends on the kinetic energy of the motor at braking start and the capacitance of the capacitor on the DC bus. If the braking kinetic energy is greater than the capacity on the DC bus and there is no other drive on the DC bus to accommodate this energy, the drive will consume this energy via the braking resistor or feed it back to food.
Baidu Encyclopedia - Inverter Braking Resistor
Baidu Encyclopedia - Braking Resistor
According to meaning of the question, wecan know, when the coil rotates at a constant speed with angular velocity ω, according to Faraday's law of electromagnetic induction, the induced electromotive force is: NBSω Since the magnetic field is a radial magnetic field, the effective cutting speed of . the coil remains unchanged, so the generator produces a small induced emf. The minimum effective value is NBSω.
According to Ohm's law of a closed circuit, the electromotive force of the power supply is:
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Then choose: rD