First, refer to different
1, inverter braking resistance: the carrier used to consume the regenerative energy of the motor in the form of heat energy.
2. Brake unit: It is called "special energy consumption brake unit for frequency converter" or "special energy feedback unit for frequency converter", which consumes the regenerative electric energy generated by the motor through the brake resistor or feeds back the regenerative electric energy to the power supply.
3. Brake chopper: It is a DC power supply device that converts DC power supply with fixed voltage value into DC power supply with variable voltage value.
Second, the role is different.
1, inverter braking resistance:? In industrial system, variable frequency braking resistor is widely used in motor starting braking speed regulation, variable frequency braking, large mechanical braking in lifting industry, braking of material conveying mechanism and other fields. Can work intermittently and continuously for a short time.
2. Braking unit: used to control occasions with heavy mechanical load and fast braking speed.
3. Brake chopper: widely used in industrial automation equipment, sensitive electronic tube voltmeter or bioelectronic instruments.
Third, the principle is different.
1. Inverter braking resistance: the inverter circuit of the inverter is turned on in the opposite direction, and the residual electric energy is fed back to the DC bus of the inverter, so that the voltage on the DC bus is increased. When it rises to a certain value, the braking resistance of the frequency converter will be put into operation, so that this part of the electric energy will be consumed in the form of resistance heating, and the voltage on the DC bus will be maintained at a normal value.
2. Braking device: need to slow down quickly. According to the principle of asynchronous motor, the greater the slip, the greater the torque. Similarly, the braking torque will increase with the increase of deceleration rate, which greatly shortens the deceleration time of the system, accelerates the energy feedback, and the DC bus voltage rises rapidly. Therefore, the feedback energy must be consumed quickly to keep the DC bus voltage below a certain safe range.
3. Braking chopper: DC chopper uses power components to cut off the power supply with fixed voltage appropriately to achieve the purpose of changing the terminal voltage of the load. If its output voltage is lower than the input power supply voltage, it is called buck DC chopper; If its output voltage is higher than the input power supply voltage, it is called boost DC chopper.
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