Abstract: The invention relates to a braking apparatus, an electric drive and an elevator system. The braking apparatus comprises an apparatus for dynamic braking, for braking an electric machine with dynamic braking, an input for the control signal of the braking apparatus, and also a controller, for controlling the apparatus for dynamic braking as a response to the aforementioned control signal of the braking apparatus.

Abstract: The invention relates to a braking apparatus, an electric drive and an elevator system. The braking apparatus comprises an apparatus for dynamic braking, for braking an electric machine with dynamic braking, an input for the control signal of the braking apparatus, and also a controller, for controlling the apparatus for dynamic braking as a response to the aforementioned control signal of the braking apparatus.

Abstract: Thermistor monitoring arrangement of an alternating-current electric motor controlled by a power transformer, such as a frequency converter, for at least one thermistor monitoring the temperature of the motor, in which is a power transformer (200), in which is a power stage (203) and a control unit (204), controlling an alternating-current electric motor (201) provided with a thermistor (202), and into which power transformer, such as a frequency converter, an input circuit connected to a thermistor located in the motor is integrated, to which input circuit a safety circuit (a so-called Safe Stop circuit) that prevents unexpected starting or ensures safe stopping of the frequency converter is connected.

Abstract: Method and arrangement for controlling the gate control voltage (U2C) of voltage-controlled power semiconductor components (V2), such as IGBT transistors, used in power electronics appliances in a fault situation, such as in a situation of short-circuit of the output connectors of a frequency converter, in which method the gate control voltage (U2C) of the power semiconductor component (V2) is decreased before the connection of the negative gate control voltage intended to extinguish the power semiconductor switch in order to minimize the voltage peak of the voltage over especially the power semiconductor component, such as the collector voltage, and in which the gate control voltage (U2C) is decreased before the connection of the negative gate control voltage intended to extinguish the power semiconductor switch such that, its level decreases constantly, and it remains positive, and in which the gate control voltage (U2C) is decreased thus until at least the first voltage peak over the component, especial

Abstract: Thermistor monitoring arrangement of an alternating-current electric motor controlled by a power transformer, such as a frequency converter, for at least one thermistor monitoring the temperature of the motor, in which is a power transformer (200), in which is a power stage (203) and a control unit (204), controlling an alternating-current electric motor (201) provided with a thermistor (202), and into which power transformer, such as a frequency converter, an input circuit connected to a thermistor located in the motor is integrated, to which input circuit a safety circuit (a so-called Safe Stop circuit) that prevents unexpected starting or ensures safe stopping of the frequency converter is connected.

Abstract: A flyback power source, comprising a transformer (T1) provided with a primary winding (N1) and at least one secondary winding (N2), a semiconductor switch (V1) in the primary circuit for connecting a supply voltage (u1) to the primary winding, said secondary circuit being provided with a filter capacitor arrangement, a diode circuit and a semiconductor switch arrangement for controlling the secondary circuit, in which power source the energy is transferred from the primary into the secondary by storing it temporarily in the magnetic circuit of the transformer. The secondary circuit of the power source contains at least one power switch (V2) and a diode selector consisting of at least two diodes (D1, D2), wherein the secondary-voltage filter capacitor into which the transformer discharges energy from its magnetic circuit is selectable by means of the diode selector and power switches, so that it is possible to produce two or more output voltages (+UC1, +UC2) from the same secondary winding.