Application of Thick Film Inductionless Power Resistor in Inverter Field

Frequency converter in the use of driving motors, often on the "brake unit" or "brake resistance" selection and other issues, this "brake unit" or "brake resistance" in the operation of the motor plays a role.

Frequency converter in the use of driving motor, often on the "brake unit" or "brake resistance" selection and other issues, this "brake unit" or "brake resistance" in motor operation plays a role? Common frequency converter usually designs DC brake function, which is generally divided into starting DC brake and stopping DC brake. This part of function is set up to prevent motor from rotating due to load before starting, or to stop accurately when the motor stops. When the function of DC brake is enabled, the motor runs in the state of DC brake (that is, energy consumption brake). At this time, there is no "brake unit" or "brake resistance" involved in the work. When the transducer drives the motor to decelerate with load, or when the potential energy load is lowered (e.g. the crane drops the heavy load), because the rotor speed of the inertial motor under load is higher than that of the stator magnetic field, for the motor, it works in the state of feedback braking. The mechanical energy in the transmission system is converted to electric energy through the motor and fed back to the transducer.

The heat dissipation ability of resistors is particularly important. Traditional winding resistance can be improved by reasonable heat dissipation design, such as reasonable layout, installation of radiators, air-cooled, water-cooled, oil-cooled heat dissipation and so on. High-power resistor: low resistance, high current, in the circuit, the current is inversely proportional to the voltage, that is Ohm's law, resistance is proportional to the voltage, inversely proportional to the current. High-power resistors are much more expensive than ordinary/W resistors. They are usually used for balanced output resistors of power supply and power amplifiers, and are often used as loads in circuit load testing. High-power resistors are characterized by more heat dissipation and many components to be far away from, such as thermistors, electrolytic capacitors, electrodes, electrodes, integrated circuits... None of these fears of heat can be approached.

Frequency-sensitive rheostat is actually a special phase-core reactor. It has a column core and a winding on each column. The phase winding is like a star. The impedance of frequency-sensitive rheostat changes obviously with the change of current frequency. When the current frequency is high, the impedance value is high, and when the current frequency is low, the impedance value is low.

Thick-film inductance-free power resistor avoids the defect of too fast temperature rise. Through surface heat dissipation and adopting better consistency resistance paste, the heat sink is increased and the heat sink substrate is changed. At present, when the temperature rise of traditional resistance is about 70 degrees, the temperature rise of thick-film is only about one degree. Thick-film inductance-free power resistor has been more and more widely used.