摘要:
An elevator brake is provided with a redundant means to release the brake to allow an elevator cab to move when a primary releasing means, such as a coil, does not release when desired. When the coil is deenergized or defective, an auxiliary coil is used to release the brake and enable the cab to move.
摘要:
A switchable permanent magnet eddy current or track brake which has a high density of permanent magnet material, a low internal flux leakage and a higher than heretofore output flux density. The pole shoes of the movable magnets are convex cylindrical segment-shaped and mate with concave cylindrical segment-shaped recesses in the lateral flux return pieces for the fixed magnets.
摘要:
The energization of the electric speed reducer of a vehicle, whose friction brakes for the front wheels and rear wheels are respectively controlled by two independent pressurized fluid circuits, is controlled by a plurality of pressure contacts. These pressure contacts are actuated by the pressure of a fluid and this pressure is permanently given a value tied to the higher of the two pressures existing in the two independent pressurized fluid circuits. A dual control relay valve of the ++ type is connected to these two circuits and to an independent source of pressurized fluid.
摘要:
A system for braking vehicles moving on rails of magnetic metal and the wheels of which are also of magnetic metal, by way of eddy currents. At least one magnetic flux is created by means of coils traversed by a direct current, said coils being preferably positioned around the wheels of the vehicle. The magnetic flux is closed from one wheel to the other by the portion of rail comprised between the said wheels after having passed through the contact zones between the wheel and the rail. Eddy currents are thus produced in the bodies of wheels and in the rails, which have a strong braking effect.
摘要:
A logic control system for magnetic track braking of a rail transit vehicle includes a magnetic track braking control circuit, a magnetic track braking power supply execution circuit, and a magnetic track braking status monitoring and feedback circuit. The magnetic track braking control circuit includes a pneumatic actuator relay, an electromagnet relay, a system protection relay, a power-on delay relay, a power-off delay relay, an automatic control branch circuit, and a manual control branch circuit. The pneumatic actuator relay is connected to the power-on delay relay, and the system protection relay is connected to the power-off delay relay. The automatic control branch circuit includes a first isolation magnetic track braking switch and an emergency braking relay contact. The manual control branch circuit includes a first circuit breaker, a cab signal option switch, a second isolation magnetic track braking switch and a manual touch button.
摘要:
An electromagnetically operated powertrain system is provided. The system includes a plurality of cylinder assemblies arranged in parallel at least partially along a vehicle. Each of the cylinder assemblies may include one or more cylinders, one or more electromagnetic devices secured to at least one of the ends of each cylinder, one or more pistons reciprocatingly received in the cylinders, and a piston rod coupled to the pistons. Each of the pistons includes a permanent magnet that creates a magnetic field interacting with an electromagnetic field generated by each of the electromagnetic devices. A pulling and/or pushing force may be selectively generated by the magnetic field and the electromagnetic field to enable the pistons to reciprocate within the cylinders. A crankshaft is coupled to the piston rods of the plurality of cylinder assemblies and directly coupled to at least one of front and rear axles of a vehicle.
摘要:
The present invention provides a motor-driven traveling device including: a vehicle body; a motor for travel driving that is capable of braking the vehicle body as a short brake or a dynamic brake; an electromagnetic brake that brakes the vehicle body, separately from the motor; an operation switching circuit that switches between causing the motor to perform travel driving and causing the motor to perform braking; a brake release switch that receives an operation pertaining to brake releasing of the motor and the electromagnetic brake; and a brake control circuit that, while the brake release switch is operated, controls the motor and the electromagnetic brake in response to the operation on the brake release switch.
摘要:
A method for operating an electric motor for braking a vehicle, including controlling the electric motor in such a way that the vehicle is slowed or decelerated with the aid of a motor braking torque exerted by the controlled electric motor. The method includes ascertaining whether a requested setpoint speed change is in a predefined normal range, and if so, the electric motor is controlled in such a way that a load to be applied by the electric motor remains less than or equal to a nominal load capacity of the electric motor. If the requested setpoint speed change is outside the predefined normal range, the electric motor is controlled in such a way that the load to be applied by the electric motor exceeds the nominal load capacity of the electric motor, at least during a predefined overload operation time interval.
摘要:
An electromagnetic active brake which is de-energized in the brake standby state, including—a brake body (1), —a brake device with at least two opposing brake shoes (9, 12) which are spaced from a component to be braked in the de-energized state of the active brake, —and an electromagnet (5) which is arranged in the brake body (1) and the armature (6) of which interacts with a brake lever (2). The armature (6) of the electromagnet (5) is rigidly connected to a spring compressor (3) which is guided in the brake body (1) and which is moved by the armature (6) in the axial direction of the armature (6) when the electromagnet (5) is energized and in this manner clamps a spring (16) against an abutment (20) that interacts with the brake lever (2) and is arranged in an axially adjustable manner in the direction of the path of the spring compressor (3). The active brake according to the invention is highly energy-saving and thus economical.
摘要:
A method for operating an electric motor for braking a vehicle, including controlling the electric motor in such a way that the vehicle is slowed or decelerated with the aid of a motor braking torque exerted by the controlled electric motor. The method includes ascertaining whether a requested setpoint speed change is in a predefined normal range, and if so, the electric motor is controlled in such a way that a load to be applied by the electric motor remains less than or equal to a nominal load capacity of the electric motor. If the requested setpoint speed change is outside the predefined normal range, the electric motor is controlled in such a way that the load to be applied by the electric motor exceeds the nominal load capacity of the electric motor, at least during a predefined overload operation time interval.