摘要:
A circuit arrangement is configured to supply an electromagnetic holding brake of an electric motor with an operating voltage for releasing the holding brake, and a voltage that is reduced relative to the operating voltage for holding the holding brake in the released position. The operating voltage is supplied from a higher-level control system disposed separately from the motor and the holding brake. The circuit arrangement is disposed in or on the motor or in or on the holding brake and includes a voltage regulator adapted to regulate, independently of the operating voltage, the reduced voltage to a fixed value after the holding brake is released.
摘要:
An electromagnetic braking system and method is provided for selectively braking a motor using an electromagnetic brake having an electromagnet, a permanent magnet, a rotor assembly, and a brake pad. The brake assembly applies when the electromagnet is de-energized and releases when the electromagnet is energized. When applied the permanent magnet moves the brake pad into frictional engagement with a housing, and when released the electromagnet cancels the flux of the permanent magnet to allow a leaf spring to move the brake pad away from the housing. A controller has a DC/DC converter for converting a main bus voltage to a lower braking voltage based on certain parameters. The converter utilizes pulse-width modulation (PWM) to regulate the braking voltage. A calibrated gap is defined between the brake pad and permanent magnet when the brake assembly is released, and may be dynamically modified via the controller.
摘要:
A method of applying a parking brake mechanism for a foundation brake includes several steps. The parking brake mechanism incorporates an electric actuator, an extensible device drivably connected to the electric actuator, and a resilient device arranged to act on the extensible device and maintain a desired level of force to be applied by the parking brake mechanism in the event of contraction of components of the foundation brake. The method includes the steps of signaling application of a service brake actuator to apply the brake, signaling driving of a first electric actuator to cause the extensible device to be able to retain the foundation brake in the brake applied position achieved by the service brake actuator, signaling the release of the service brake actuator, signaling driving of a second electric actuator to further compress the resilient element, monitoring a characteristic of the brake to determine if a desired force has been applied by the parking brake mechanism, and signaling driving of the electric motor to stop once the desired force has been reached.
摘要:
A brake application for a rail vehicle brake includes a brake actuator for application and release of the rail vehicle brake. Also included is a force converter for converting energy supplied by the brake actuator to a brake application movement. The force converter includes: (1) a shearing force measuring bolt arranged in a power transmission path; (2) at least one measuring sensor measuring breaking force either indirectly or directly; and (3) at least two mutually swivellable force transmission elements having passage openings. The shearing force measuring bolt forms a hinge bolt of a hinge, which hinge bolt penetrates the passage openings.
摘要:
A variable electric brake assembly applies braking force to the wheel of a materials handling vehicle through a rotor shaft. A brake rotor rotates on the rotor shaft and is located within the brake assembly. When the vehicle is in a parked position, both an inner coil and an outer coil are de-energized. With the inner coil de-energized, an inner armature is not attracted to the inner coil, and the inner armature is forced against the brake rotor by springs to prevent the rotation of the brake rotor. When the vehicle is moving in a free running position, the outer coil remains de-energized while the inner coil is energized. With the inner coil energized, the inner armature is attracted to the inner coil and overcomes the force of the springs, thereby allowing the brake rotor to freely rotate. When the vehicle undergoes dynamic braking, both the outer coil and the inner coil are energized. When the outer coil is variably energized, the outer armature is variably attracted to the outer coil to apply a variable dynamic braking force to the brake rotor.
摘要:
A parking brake system includes an engine oil pressure switch normally controlling the activation of a parking brake. The controller is actuated to temporally ignore a communication from the engine oil pressure switch so that the brake may be released even when the engine is disabled.
摘要:
A brake position sensor unit includes a unitary brake shaft that transmits braking torque to a article to be slowed, connects directly to a brake unit, connects to a resolver and has a plurality of planetary gears rotating thereabout to activate a sensor when the brake unit is set.
摘要:
A brake position sensor unit includes a unitary brake shaft that transmits braking torque to a article to be slowed, connects directly to a brake unit, connects to a resolver and has a plurality of planetary gears rotating thereabout to activate a sensor when the brake unit is set.
摘要:
A parking brake apparatus includes a first braking member provided at a wheel and integrally rotated with the wheel, a second braking member provided at a vehicle body side for stopping a rotation of the first braking member, a parking brake device for pressing the second braking member to the first braking member by an operating force of a parking brake operation, a pressurizing device for pressurizing a brace fluid independently of the parking brake operation, and a hydraulic pressure controlling device for preliminarily pressing the second braking member to the first braking member by a brake fluid pressure pressurized by the pressurizing device in a case when the second braking member is pressed to the first braking member by means of the parking brake device.