Disclosed are a brake apparatus, a wheel body assembly, and a rollator. The brake apparatus comprises a shaft body, a housing, a magnetic induction mechanism and an adjustment mechanism. The housing rotates relative to the shaft body; the magnetic induction mechanism is arranged in the housing to generate resisting force opposite to a rotation direction of the housing or the shaft body to the housing or the shaft body by a magnetic field reaction when the housing rotating relative to the shaft body. The adjustment mechanism is connected to the magnetic induction mechanism for adjusting a magnitude of the resisting force. The magnetic induction mechanism is capable of playing a braking role on the wheel body integrated or connected with the brake apparatus, because its braking force is related to the rotation of the housing or shaft body, rather than friction braking, it will not produce an emergency stop effect.

Systems and methods for constructing permanent magnet electric motors in which rotors have magnetically permeable end rings that are active for torque production. In one embodiment, a rotor section has a set of flat, generally annular laminations stacked on an inner rotor sleeve, with a pair of end rings positioned at opposing ends of the lamination stack to secure the stack. One or both of the end rings is made of a magnetically permeable and highly resistive material such as a soft magnetic composite, so that the end ring(s) actively produce torque during operation of the motor without significant increase in core loss at end rings. A set of permanent magnets are installed in or on the rotor core formed by the laminations. These magnets or other magnets may be positioned to axially overlap with the end rings and aid active torque production by the end rings.

Systems and methods for constructing permanent magnet electric motors in which rotors have magnetically permeable end rings that are active for torque production. In one embodiment, a rotor section has a set of flat, generally annular laminations stacked on an inner rotor sleeve, with a pair of end rings positioned at opposing ends of the lamination stack to secure the stack. One or both of the end rings is made of a magnetically permeable and highly resistive material such as a soft magnetic composite, so that the end ring(s) actively produce torque during operation of the motor without significant increase in core loss at end rings. A set of permanent magnets are installed in or on the rotor core formed by the laminations. These magnets or other magnets may be positioned to axially overlap with the end rings and aid active torque production by the end rings.

A rotating body is rotatably supported on a holding section. The holding section includes a rotation detection unit, a torque-applying unit, and a brake-applying unit. The torque-applying unit includes an A-phase torque-applying coil and a B-phase torque-applying coil, and a resistance torque and a pull-in torque applied to a rotor (magnet) are caused to vary as a result of controlling supply of current to each of the coils. In addition, a braking force can be controlled by supplying current to a brake-applying coil included in the brake-applying unit.

A rotating body is rotatably supported on a holding section. The holding section includes a rotation detection unit, a torque-applying unit, and a brake-applying unit. The torque-applying unit includes an A-phase torque-applying coil and a B-phase torque-applying coil, and a resistance torque and a pull-in torque applied to a rotor (magnet) are caused to vary as a result of controlling supply of current to each of the coils. In addition, a braking force can be controlled by supplying current to a brake-applying coil included in the brake-applying unit.

An inner brake motor includes a stator assembly, a rotor assembly connected to the stator assembly, and a magnetic brake assembly connected to the rotor assembly. The rotor assembly has a rotor cover sleeved on the periphery of the stator assembly. The magnetic brake assembly has a movable piece selectively attached to or detached from the rotor assembly. A convex-concave brake structure is formed between the movable piece and the rotor cover. The magnetic brake assembly brakes by frictionally engaging with the rotor assembly through the brake structure, thereby achieving the effect of simplifying the brake structure and reducing the volume of the inner brake motor

An inner brake motor includes a stator assembly, a rotor assembly connected to the stator assembly, and a magnetic brake assembly connected to the rotor assembly. The rotor assembly has a rotor cover sleeved on the periphery of the stator assembly. The magnetic brake assembly has a movable piece selectively attached to or detached from the rotor assembly. A convex-concave brake structure is formed between the movable piece and the rotor cover. The magnetic brake assembly brakes by frictionally engaging with the rotor assembly through the brake structure, thereby achieving the effect of simplifying the brake structure and reducing the volume of the inner brake motor

A method and a driveline are used for stabilization of an electrical grid. The driveline for an electricity generator includes a controllable power unit, such as a gas motor or a gas turbine. A generator generates electrical power. The generator is connectable to the electrical grid for feeding electrical power into the electrical grid. A torque limiting coupling is arranged in the driveline between the generator and the power unit. To limit the torque, the torque limiting coupling is caused to slip and a limited torque is provided to the generator.

Disclosed is a brake device, a wheel body assembly and a rollator. The brake device includes a shaft body, a housing, a magnetic inductor and a magnet assembly, the housing sleeved outside the shaft body and configured coaxially with the shaft body, the housing being rotatable relative to the shaft body, the magnetic inductor having a coil wound thereon, the magnet assembly including a plurality of magnets spaced along the circumference of the shaft body, wherein one of the magnetic inductor or the magnet assembly is connected to the shaft body and the other is connected to the housing so that when the housing rotates relative to the shaft body, the coil is capable of cutting the magnetic field formed by the magnet assembly so as to produce resistance in the opposite direction of rotation of the housing or the shaft body, which can play a braking role on the wheel body integrated or connected with the brake device. And because the braking force is related to the rotation of the housing or the shaft body, rather than friction braking, it will not produce an emergency stop effect, which is more safer and also can reduce wear and improve the service life of the brake device. Meanwhile the brake device is simple in structure and easy to prepare.

Disclosed is a brake device, a wheel body assembly and a rollator. The brake device includes a shaft body, a housing, a magnetic inductor and a magnet assembly, the housing sleeved outside the shaft body and configured coaxially with the shaft body, the housing being rotatable relative to the shaft body, the magnetic inductor having a coil wound thereon, the magnet assembly including a plurality of magnets spaced along the circumference of the shaft body, wherein one of the magnetic inductor or the magnet assembly is connected to the shaft body and the other is connected to the housing so that when the housing rotates relative to the shaft body, the coil is capable of cutting the magnetic field formed by the magnet assembly so as to produce resistance in the opposite direction of rotation of the housing or the shaft body, which can play a braking role on the wheel body integrated or connected with the brake device. And because the braking force is related to the rotation of the housing or the shaft body, rather than friction braking, it will not produce an emergency stop effect, which is more safer and also can reduce wear and improve the service life of the brake device. Meanwhile the brake device is simple in structure and easy to prepare.