LR41 battery.Structure of braking resistor_braking resistor wiring

　　The structure of the braking resistor and the wiring diagram of the braking resistor are provided by electronic enthusiasts. This article mainly introduces the structure and wiring method of the braking resistor. The usage rate of the braking resistor specifies the usage efficiency of the braking resistor to avoid overheating and damage of the braking resistor, which will affect the braking effect of the braking unit. The lower the usage rate of the braking resistor is set, the smaller the degree of heating of the resistor, the less energy consumed on the resistor, and the worse the braking effect. Braking resistor structure

　　Ceramic tube

　　It is the skeleton of the alloy resistance wire and also functions as a radiator;

　　Alloy resistance

　　The wavy shape of the flat belt is wrapped around the surface of the ceramic tube and is responsible for converting the regenerated electrical energy of the motor into heat energy;

　　coating

　　Coated on the surface of the alloy resistance wire, it has high temperature resistance and functions as flame retardant.

　　Braking resistor usage rate

　　The usage rate of the braking resistor specifies the usage efficiency of the braking resistor to avoid overheating and damage of the braking resistor, which will affect the braking effect of the braking unit. The lower the usage rate of the braking resistor is set, the smaller the degree of heating of the resistor, the less energy consumed on the resistor, and the worse the braking effect. At the same time, the capacity of the braking unit is not fully utilized. Theoretically, when the braking resistor utilization rate is 100%, the capacity of the braking unit is fully utilized and the braking effect is the most obvious. However, this requires a larger braking resistor power, and the user should consider it comprehensively. Under the premise that the resistance and power of the braking resistor have been determined, for large inertia loads that decelerate slowly, choosing a lower resistor usage rate will achieve better results. For loads that need to stop quickly, a larger braking resistor usage rate should be selected.

　　Three-phase asynchronous motor reverse braking resistor connection method and control circuit diagram

　　Reverse braking is a braking method that changes the phase sequence of the motor power supply so that the rotating magnetic field generated by the stator winding is opposite to the direction of rotation of the rotor, thereby generating braking torque. It should be noted that when the motor speed approaches zero, the power supply must be disconnected immediately, otherwise the motor will rotate in the opposite direction.

　　In addition, due to the large reverse braking current, a resistor needs to be added in series to the stator circuit during braking to limit the braking current. There are two ways to connect the reverse braking resistor: symmetrical resistance connection and asymmetrical resistance connection, as shown in the figure below. Generally, the braking resistor adopts symmetrical connection method, that is, the same braking resistor is connected in series in the three phases.

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