Analysis Of Slip Power Of Magnetic Powder Brake

The magnetic powder clutch and the magnetic powder brake (hereinafter referred to as the clutch and the brake) use the magnetic powder in the working gap as a medium during operation. Depending on the operating conditions, some of them work in a short slip condition (ie, there is a difference in speed between the main and follower), while others work in full slip. Since the magnetic powder layer in the gap constantly moves relative to the position during operation, the magnetic powder particles must rub against each other, thereby releasing a large amount of heat, and at the same time, electrical loss is also generated in the exciting coil. Due to heat generation, the resistance of the coil will increase. When the applied voltage is constant, the current and torque will gradually decrease in a certain period of time, and the magnetic permeability of the magnetic powder will also decrease with the increase of temperature. When the heat is severe, the magnetic powder may even sinter. .

The increase in temperature also causes the value of the working gap and the fit size of the clutch and brake to change. Overheating can adversely affect the bearing oil, seals, and coils. In this case, the rated torque value can no longer be used as an indicator to ensure its safe operation, but an index that can reflect its safe connection and braking capacity, that is, rated slip power, must be sought and determined. At present, the research on the thermal analysis of clutches and brakes in China is not deep enough, and it is difficult to provide users with reliable data of rated slip power, which limits the promotion and application of this new technology to some extent.

The magnetic powder brake is a medium that receives magnetic powder and is formed by forming a magnetic powder chain under an energized environment. When the new transmission component of the line torque, the tension consists of the inner rotor, the outer rotor, the excitation coil and the magnetic powder. There is no snoring between the powder and the driven rotor, and the active rotor idling. The purpose of braking torque.

When the characteristic ring is not energized, the active rotor rotates. Due to the centrifugal force, the magnetic powder brake is clamped on the inner wall of the active rotor. After the magnetic power is connected to the DC power source, the electromagnetic field is generated. The magnetic powder of the medium forms a magnetic powder chain under the action of the magnetic force line, and the inner rotor is formed. The outer rotor is connected to reach the transmission. The frequency is high, the frequency is high, the linearity is good every minute, the output torque is constant, the power and the overload can reach 40-60 times, which can be widely used in fast events. State and high frequency locations. The moment is proportional to the excitation current in a fairly general category and can be used as a linear adjustment component because the magnitude of the torque depends only on the magnitude of the excitation current and is independent of the slip speed.

The operation is stable, and there is no vibration, no blow, no noise in the state of starting, running and braking. In the torque overload environment, the automatic slip is operated to the overload shield. It is convenient to install and has a long service life. The use of high magnification, with a small excitation current to control a large transfer power, easy to achieve automatic control. Small in size and light in weight. It is used in constant tension control systems, such as: printing presses, slitting machines, laminating machines, coating machines, paper machines, wire drawing machines and cable winding machines, as well as processing and configuration of sheet metal, strip, film, etc.

As an overloader, it is used in the engine, electric motor, electric layout, stepless speed regulation, and equipped with hydraulic components, reducer and other dynamic rigid plates for torque measurement. Speed system. The sensor and control circuit can realize stepless speed regulation. The magnetic powder brake is especially suitable for fine adjustment of speed at high speed and medium and small power adjustment. In the overload cover, when the system is sold, when the torque is overloaded, the clutch automatically uses the link. The smooth slick characteristics and the constant rotation, that is, the acceleration and the peak torque that does not produce a blow. Thereby shielding the rigid configuration and the motive force. The buffer is activated to stop the buffering result of the moment characteristic.