What is the working principle of an electrically operated brake?

Electromagnetic powder brake: When the excitation coil is energized, a magnetic field is formed. Under the action of the magnetic field, the magnetic powder is magnetized to form a magnetic powder chain, which aggregates between the fixed magnetizer and the rotor, achieving braking through the binding force and friction of the magnetic powder. When the excitation current disappears, the magnetic powder is in a free and loose state, and the braking action is released. It is suitable for the drive systems of various machines. Features of the energized brake: light weight, small size, low excitation power, easy to control. The braking torque is independent of the speed of the rotating parts, but the magnetic powder will cause wear and tear of the parts.

① Electric Brake Electromagnetic powder brake: When the excitation coil is energized, a magnetic field is formed. Under the action of the magnetic field, the magnetic powder is magnetized to form a magnetic powder chain, which aggregates between the fixed magnetizer and the rotor, achieving braking through the binding force and friction of the magnetic powder. When the excitation current disappears, the magnetic powder is in a free and loose state, and the braking action is released. It is suitable for the drive systems of various machines. Features of electric brakes include light weight, small size, low excitation power, easy control, and braking torque independent of the speed of the rotating parts. However, the magnetic powder will cause wear and tear on the parts.

② Electromagnetic eddy current brake: When the excitation coil is energized, a magnetic field is formed. The armature on the braking shaft rotates to cut the magnetic lines of force and generate eddy currents. The eddy currents in the armature interact with the magnetic field to form a braking torque. Electromagnetic eddy current brakes are robust, durable, easy to maintain, and have a wide speed regulation range; however, they have low efficiency at low speeds, and the temperature rises, requiring heat dissipation measures. This type of brake is often used in machinery with vertical loads.

③ Electromagnetic friction brake: When the excitation coil is energized, a magnetic field is generated, and the armature is attracted by the magnetic yoke, braking the armature via connecting components.

        

Structure of electric brake: An electromagnetic excitation brake consists of a magnetic yoke, excitation coil, spring, brake disc, armature, spline sleeve, mounting bolts, etc. The brake is installed at the rear end of the equipment flange (or motor) and extends outwards; the drive shaft is connected to the spline sleeve and brake disc.

Working principle of electric brake: When the excitation coil of the electromagnetic brake is connected to the rated voltage (DC), the electromagnetic force attracts the armature, causing the armature to separate from the brake disc (release). At this time, the drive shaft rotates normally or starts from the brake disc. When the drive system is separated or the power is cut off, the brake is also de-energized. At this time, the spring applies pressure to the armature, forcing a frictional torque between the brake disc, armature, and flange, causing the drive shaft to stop quickly. When the brake's heat dissipation environment is poor and the drive shaft operates continuously for a long time, if conditions permit, to reduce heat generation, the voltage can be maintained at 70%-80% of the rated voltage after the brake operates.

Precautions for electric brakes:

1. High speed of electric brake: The high allowable speed of the clutch and brake (see the basic parameter table of electromagnetic clutches and brakes) is determined by the high speed of the friction surface. Using it beyond this speed will not produce the rated torque, and abnormal wear or overheating deformation will occur.

2. Temperature of electric brake: The clutch and brake both have B-class insulation, with a normal temperature rise of 40℃. The operating temperature at thermal equilibrium should not exceed 100℃, otherwise, the coil and friction parts are easily damaged.

 　　3. Electric Brake Humidity and water droplets: If water droplets adhere to the friction surfaces of the clutch and brake, low friction will occur before complete drying. Moisture is the main cause of corrosion of this product, please pay full attention.