Abstract: A brake assembly includes: a motor rotor; a brake disc fixed on the motor rotor; a friction plate fixed to and surrounding the brake disc; a bearing rotatably sleeved on the motor rotor; an electromagnet assembly fixed on the bearing; a baffle plate fixed to the electromagnet assembly; an armature slidably sleeved on the motor rotor, and located between the baffle plate and the electromagnet assembly; and a spring assembly provided between the armature and the electromagnet assembly. When the electromagnet assembly is de-energized, the armature is pushed by the spring assembly to move in a direction close to the baffle plate, such that the friction plate is clamped by the armature and the baffle plate to realize braking.

Abstract: The method and unit for braking a metal strip (1), running off a wind-out coiler (2.1) in the form of a coil (1.1) and running onto a wind-on coiler (2.2) again, are to guarantee that a surface of the metal strip remains undamaged and a full effective braking force is exerted on the metal strip (1) by means of an eddy current brake (3.1) with a rotating magnet system (3.2). The above is achieved, whereby the braking force is exerted on the metal strip (1) by means of an induced counter-torque against a support bearing (4) to one side in a non-contact manner, whereby the support bearing (4) may be embodied as a counter roller (4.1).

Abstract: The present invention relates to a system for controlling the rotation speed of AC motors, in particular single phase motors. In this case, a controllable electronic switching device is connected upstream of the motor and is actuated by a control unit such that a sinusoidal input AC voltage is used to produce a motor AC voltage which can be varied in order to change the rotation speed. The control unit is designed in such a manner that the fundamental frequency and/or the amplitude of the motor AC voltage can be varied by phase gating.

Abstract: A control apparatus for an elevator comprising loss impartation means to impart a loss to a hoisting machine for a cage; cage position detection means to detect the position of the cage; and control means to control the loss impartation means on the basis of an output signal of the cage position detection means so as to adjust the loss in accordance with the position of the cage; wherein by adjusting and controlling the loss, the resonance of a mechanical system composed of the cage, a balance weight, a hoisting rope, etc., is suppressed to improve riding conditions in the elevator car.

Abstract: An arrangement for energy economy in a drive which includes an induction motor and a clutch-brake unit, particularly for sewing machines is provided. The windings of the induction motor are dimensioned so that the motor speed remains virtually constant in a stable speed range under normal service conditions, and in which the clutch-brake unit serves to control the drive output speed, so that the motor operates in an alternation of load phases and no-load phases. Switches are included in the current paths of the windings, which reduce the current through the windings to a prescribable degree. A modulation circuit to control the acceleration of the motor speed and its persistence in the stable speed range during load variations is associated with the switches. The modulation circuit contains a delay element, which is triggered when the mains voltage is applied, and an impulse prolongation element having a time constant dimensioned so that the motor remains in the stable speed range under all service conditions.

Abstract: The control system has application to polyphase AC wound rotor motor which employ opposed parallel connected phase controlled thyristors together with series connected fixed resistors in each leg of a delta connected secondary impedance network. The line-to-line secondary terminals of the motor provide a source of polyphase variable frequency and variable amplitude AC reference signals. The variable frequency, variable voltage reference signals are converted into complementary pairs of square wave synchronization voltages. These same reference voltages are also concurrently integrated during their respective positive and negative half cycles to provide complementary pairs of constant peak amplitude, variable frequency voltages which are combined with associated ones of the aforementioned synchronization voltages to provide synchronization locks.