Jiaozuo brake

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Classification of electromagnetic brakes

Brake is a Machine element that stops or decelerates moving parts in machinery, commonly known as brake, brake. It mainly consists of a brake frame, brake components, and control devices. Some brakes are also equipped with automatic adjustment devices for brake component clearances. In order to reduce braking torque and structural dimensions, brakes are usually installed on the high-speed shaft of equipment, but for large equipment with high safety requirements, such as mine hoists, elevators, etc., they are installed on the low-speed shaft near the working part of the equipment. The brakes have been standardized and serialized, and are manufactured by professional factories for selection. Electromagnetic brake is an ideal automatic execution component in modern industry, which mainly plays a role in transmitting power and controlling motion in mechanical transmission systems. It has the advantages of compact structure, simple operation, sensitive response, long service life, reliable use, and easy to achieve remote control.

The electromagnetic brake is mainly matched with the series of motors. Widely used in metallurgy, construction, chemical, food, machine tools, stages, elevators, ships, packaging and other machinery, as well as in situations such as emergency braking during power outages. The resistance torque that must be applied to stop or decelerate the mechanical operating components is called the braking torque. The braking torque is the basis for designing and selecting brakes, and its size is determined by the mechanical type and working requirements. The performance of the friction materials (brake components) used on the brake directly affects the braking process, and the main factors affecting its performance are the working temperature and temperature rise rate. Friction materials should have high and stable friction coefficients and good wear resistance. Friction materials are divided into two categories: metallic and non-metallic. The former commonly used include cast iron, steel, bronze, and powder metallurgy friction materials, while the latter includes leather, rubber, wood, asbestos, and non asbestos.

The brake that uses electromagnetic effect to realize braking can be divided into electromagnetic powder brake, electromagnetic eddy current brake, electromagnetic friction brake and other forms

1、 Electromagnetic powder brake: When the excitation coil is energized, a magnetic field is formed, and the magnetic powder is magnetized under the action of the magnetic field, forming a magnetic powder chain, which aggregates between the fixed magnetic conductor and the rotor. Braking is achieved by the binding force and friction force of the magnetic powder. When the excitation current disappears, the magnetic powder is in a free and loose state, and the braking effect is relieved. This type of brake has small volume, light weight, low excitation power, and the braking torque is independent of the rotational speed of the rotating parts. However, magnetic particles can cause component wear. It is convenient for automatic control and suitable for driving systems of various machines.

2、 Electromagnetic eddy current brake: magnetic field is formed when exciting coil is energized. The armature on the brake shaft rotates and cuts the magnetic field lines, generating eddy currents. The interaction between eddy currents and magnetic fields in the armature forms a braking torque. The electromagnetic eddy current brake is durable, easy to maintain, and has a wide speed range; But at low speeds, the efficiency is low and the temperature rises, so heat dissipation measures must be taken. This type of brake is commonly used in machinery with vertical loads.

3、 Electromagnetic friction brake: The excitation coil is energized to generate a magnetic field, and the armature is attracted by the magnetic yoke. The armature is braked through the connecting piece.

In addition, it is further divided into dry single disc electromagnetic brakes, dry multi disc electromagnetic brakes, wet multi disc electromagnetic brakes, etc.

It can also be divided into power on braking and power off braking based on the braking method.