SU1494152A1 - Synchronous motor - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to increase reliability and reduce power losses during the start-up of a synchronous motor. The electric motor contains a stator with a winding, a rotor with an excitation winding and a damping winding, adjustable resistors. At each pole 1 of the rotor there are two semi-coils 2.3 of the excitation winding and a capacitor, with the ends of the semi-coils connected to the beginnings of the semi-coils of the adjacent pole and through the capacitor 4 to each other. The beginning of the coils of the first pole are connected to the ends of the coils of the latter through adjustable resistors. 1 il.

Description

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The invention relates to electric machines, namely to the start of synchronous motors at lower starting currents.

The aim of the invention is to improve reliability and reduce power loss during the triggering of a pixigator.

In the drawing, the Staplia Ia electrical circuit of the winding is excitable.

At each pole 1 of the rotor (not shown) there are two parts (semi-coils) 2 and 3 of the excitation winding with the number of turns V7, and with the number of turns W and the capacitor 4. The ends of the parts of the excitation winding 2 and 3 are connected to the same parts 2 and 3 co-components of the neighboring pole 1 and connected to the capacitor 4. The beginnings of the perpendicular to the circuit of parts 2 and 3 of the field windings are connected to the ends of the last circuits of the parts. and 3 field windings through adjustable resistors 5 (R |) and 6 (I). Controlled switches 7 and 8 are used to transition from the acceleration of the engine to the steady state when the motor reaches the subsynchronous speed and connects the parts 2 and 3 of the excitation winding to the terminals 9 and 10. The key 7 is connected parallel to the resistor 5 and the key 8 is connected in series with the resistor 6.

Synchronous motor works as follows.

With the open key 7 and the closed key 8, an alternating current flows in the asynchronous mode of the motor in parts 2 and 3 of the excitation winding. In view of the presence at pole 1 of capacitor 4, this current is determined by the active, inductive and capacitive impedances of the elements of parts 2 and 3 field windings and resistors 5 and 6.

If the ratio between inductive and capacitive impedances is satisfied, a resonance effect and a sharp increase in the active components of currents flowing in parts 2 and 3 of the excitation winding occur, which leads to an increase in engine torque during acceleration. If the capacitive resistance is more inductive, then the reactive component of the alternating current has a Hoii capacitive character, which leads to a decrease in the total starting current of the motor. Key 7 closes and key 8 opens when the motor reaches subsynchronous speed and the voltage is connected to terminals 9 and 10.

The expansion of the starting circuit is achieved by adjusting the resistors 5 and 6.

With an appropriate choice of capacitance C, voltage capacitors do not appear on them and reliability increases. I

The engine according to the invention has a higher overvoltage and reduced power loss during start-up compared with the prototype, since it has a significantly reduced starting current.

Claims (1)

Invention Formula A synchronous motor containing a stator with a winding, a rotor with an excitation winding at the poles and a damper winding, variable resistors, characterized in that, in order to increase reliability and reduce power losses during engine start, the excitation winding at each pole is made of two parts, a part of windings excitations of different poles are connected in series, capacitors are connected between the ends of different windings of the excitation windings at the ends of the poles, and the beginnings of the poles of the excitation windings that are first in the circuit are connected to Tsami last in a chain drive windings through variable resistors, which are connected to controllable keys, one of them - in parallel, and another - sequentially.