Rectification of the regenerative braking principle is: when a given frequency, if the synchronous speed below the rotor of motor speed, when the motor is in a state of regenerative braking. For the high power motor, decoiler and hoisting machinery down heavy working condition, particularly important. The external inverter braking resistor and brake unit as optional components, need to buy separately, its connection method and option specifications generally introduce on the inverter package insert. Need to pay attention to is, regenerative braking unit, also known as active inverter unit, realizes the active inverter two basic premise is: the main road should have a high quality of no less than 90% rating ac power; The design of the main road power required large enough (To match the connected inverter 100 times the total power。 Rectifier feedback unit can provide the inverter with both public dc power supply, and make the motor braking energy feedback power grid, so it is used in more energy feedback system, at the same time can also consists of a rectifier feedback unit under common dc bus more than one in the form of frequency converter. If there are feedback brake unit, so it can be motor regenerative feedback to the electricity grid, so that the speed regulation system in the regenerative braking state, not only save the energy, also increase the braking torque. Inverter functions of general inverter, is single phase bridge rectifier unit, the pull of a given frequency decline at a faster rate than when the inverter system is reduced with the motor speed, motor winding cutting speed rotating magnetic field, winding electromotive force and the current increase, make the motor in the braking state or state power, the energy feedback will be sent to you by inverter of diode to dc power supply with high power tube parallel link, when the energy feedback is larger, can cause dc overvoltage and downtime. As a result, choose according to actual situation of economic effective braking method and brake function design of ac variable frequency speed regulation system is very important link. Occasions with higher requirements for dynamic index, even irreversible steady speed running control system, also need to use regenerative braking measures, in order to achieve the effect of the dynamic error minimum. For large rolling inertia system, if do not have regenerative braking, in order to ensure not downtime due to feedback voltage frequency converter, can only set it down for freedom, depends on the load torque and friction torque braking rest a long time is needed to make equipment, when the system fails for quick parking or speed given often change, must take effective braking measures. General inverter there are three kinds of electric braking method commonly used: dc braking, braking unit/braking resistor, rectifier feedback. Each have characteristics, the three braking modes have different applicable conditions and occasions. General in general inverter dc brake can be set through the converter, the following parameters to achieve. 1. Sets the braking time, that is, to the stator winding is going into the dc power supply in time, it should be slightly longer than the actual downtime. 2. Whether to enable first dc brake function which an option is enabled. 3. According to the actual needs, set up a dc brake current. （Generally can choose between 0 ~ 400%)4. To set the start of the direct current braking frequency, that is, when the working frequency of the inverter down to how much start from regenerative braking to dc brake, it is set according to the load requirement for the braking time. Generally speaking, the load without strict requirements on braking time, this value should be set smaller. When a device needs to be frequent braking or high torque braking, you should choose an external braking resistor and brake unit. The effect of external braking resistor and brake unit is a fall in the inverter frequency, the drag system of feedback to the inverter dc energy consume. the main products: stepper motor, brushless motor, servo motor, stepping motor drive, brake motor, linear motor and other kinds of models of the stepper motor, welcome to inquire. Telephone:
