Electromagnetic loss of power brake

Abstract

The application belongs to the technical field of brakes, and particularly relates to an electromagnetic power-off brake, which comprises a static iron core, a brake assembly and a moving iron core connected in sequence; the static iron core is provided with a coil, the moving iron core is in sliding fit with the static iron core, the moving iron core is electromagnetically attracted to the static iron core when the coil is electrified and abuts against the brake assembly when the coil is powered off; on the facing end faces, the static iron core is provided with a matching groove, and the moving iron core is provided with a matching protrusion; the matching protrusion is located in the matching groove and is in gap fit with the matching groove. The actual initial magnetic circuit air gap of the application is far smaller than the actual working gap between the facing end faces of the moving iron core and the static iron core, which can reduce the air gap loss of the magnetic circuit during braking, reduce the required ampere turns of the coil, thereby reducing the power consumption, effectively reducing the volume and weight of the static iron core, and meeting the requirements of small volume and low power consumption of the electromagnetic power-off brake.

Claims

1. An electromagnetic power-off brake, characterized in that, include: The stationary iron core, the braking assembly, and the moving iron core are connected in sequence; The stationary iron core is provided with a coil, and the moving iron core is slidably engaged with the stationary iron core. When the coil is energized, the moving iron core is electromagnetically attracted to the stationary iron core, and when the coil is de-energized, it abuts against the braking assembly. On the opposite end faces, the stationary iron core is provided with a mating groove, and the moving iron core is provided with a mating protrusion; The mating protrusion is located within the mating groove and is in clearance fit with the mating groove; Both the stationary iron core and the moving iron core are annular. A first gap is provided between the mating protrusion and the mating groove along the circumference of the stationary iron core. When the coil is de-energized, a second gap is provided between the mating protrusion and the mating groove along the axial direction of the stationary iron core. The first gap is smaller than the second gap. The stationary iron core has an annular groove on its end face facing the moving iron core, and the coil is installed in the annular groove; the mating groove includes a first groove and a second groove, the first groove being located outside the annular groove and the second groove being located inside the annular groove; the mating protrusion includes a first protrusion and a second protrusion, the first protrusion being located in the first groove and having a clearance fit with the first groove, and the second protrusion being located in the second groove and having a clearance fit with the second groove. The braking assembly includes a fixed base, a braking element, and an elastic element. The fixed base is mounted on the stationary iron core, the moving iron core is located between the stationary iron core and the fixed base, the braking element is located between the moving iron core and the fixed base, and one end of the elastic element abuts against the stationary iron core and the other end abuts against the moving iron core. The braking component includes a connecting frame and a braking friction ring. The connecting frame is used to connect to the motor shaft. The braking friction ring includes a dynamic friction ring and a static friction ring. The static friction ring is installed in the fixed base and slides with the fixed base. The dynamic friction ring is installed on the connecting frame and slides with the connecting frame. The dynamic friction ring is located between the static friction ring and the moving iron core. There are multiple dynamic friction rings and static friction rings, which are arranged alternately in sequence. The number of dynamic friction rings is one more than the number of static friction rings.

2. The electromagnetic power-off brake according to claim 1, characterized in that: The mating grooves are multiple, and the multiple mating grooves are distributed in a circular array or at unequal intervals in the circumferential direction of the stationary iron core; The mating protrusions are multiple, and the multiple mating protrusions are distributed in a circular array or at unequal intervals in the circumferential direction of the moving iron core; The plurality of mating grooves and the plurality of mating protrusions correspond one-to-one.

3. The electromagnetic power-off brake according to claim 1, characterized in that: The end faces of both the mating groove and the mating protrusion are perpendicular to the axis of the stationary iron core.

4. The electromagnetic power-off brake according to claim 1, characterized in that: Along the circumference of the stationary iron core, the two ends of the mating groove are parallel to the same diameter line of the stationary iron core; Along the circumference of the moving iron core, the two ends of the mating protrusion are parallel to the same diameter line of the moving iron core.

5. The electromagnetic power-off brake according to claim 1, characterized in that: Along the circumference of the stationary iron core, the distance between the two ends of the first groove is greater than the distance between the two ends of the second groove; Along the axial direction of the moving iron core, the distance between the two ends of the first protrusion is greater than the distance between the two ends of the second protrusion.

6. The electromagnetic power-off brake according to claim 1, characterized in that: Friction plates are provided on the dynamic friction ring, the static friction ring, and the moving iron core; The friction pad is made of a composite material of copper powder, resin, and fiber.

7. The electromagnetic power-off brake according to claim 1, characterized in that: When the coil is energized, an average gap is provided between the dynamic friction ring and the static friction ring; The width of the average gap ranges from 0.2 mm to 0.3 mm; The width of the second gap ranges from 0.8 mm to 1.2 mm; The width of the first gap ranges from 0.11 mm to 0.19 mm.

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