CN2186972Y

CN2186972Y - Winding motor with brushless starting device

Info

Publication number: CN2186972Y
Application number: CN 94203997
Authority: CN
Inventors: 李荣生
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-02-17
Filing date: 1994-02-17
Publication date: 1995-01-04
Anticipated expiration: 2004-02-17

Abstract

A winding motor with brushless starter is composed of stator, rotor and control circuit for automatically controlling the equivalent resistance in rotor loop, which includes synchronous power supply, rectifier, voltage stabilizer, controller and executing circuit, and can automatically change the conduction angle of bidirectional thyristor from 60 deg to 0 deg when starting up, so eliminating the slip ring, brush and starting resistor of ordinary winding motor.

Description

Winding electrical machinery with brushless starting device

The utility model relates to a kind of improved wound-rotor motor, belongs to technical field of motors.

At present, general winding motor is made up of stator, rotor, slip ring and brush, wherein, the rotor winding is connected into star more, each phase head end is separately fixed on the slip ring, by slip ring, brush, the additional reactor of rotor winding and outside can be connected, thereby reach the purpose of improving starting performance or speed governing.Therefore, this winding motor is than common asynchronous machine, and it is complicated that structure is wanted, and cost is relatively also higher, and optional features such as electric brush slip ring also are easy to break down.

The purpose of this utility model is a kind of wound-rotor motor with the started with no brush device of design.

The purpose of this utility model is achieved in that from being located at epitrochanterian additional winding internal induction and goes out control and power supply signal, Drive and Control Circuit removes to control the angle of flow of one group of bidirectional triode thyristor, regulate equivalent resistance in the rotor loop thereby reach, so as to reaching the purpose that satisfies start request.

A basic scheme of this brushless winding motor is: by stator, on the motor basis that rotor is formed, set up the circuit of equivalent resistance in one group of control rotor loop again, described circuit comprises synchro source 1, rectifier 2, pressurizer 3, controller 5 and executive circuit 6, wherein, synchro source 1 is for adding around cloudy L1, L2, L3, it is embedded in the corresponding rotor slot with the rotor winding, the electric current of synchro source 1 induction is divided into two-way after rectifier 2 rectifications, one the tunnel send pressurizer 3, one road self-potential device W1 takes out and send controller 5, described controller 5 is by transport and placing device IC, unijunction transistor T3 and controllable silicon SR4 constitute, wherein, "+" input of transport and placing device IC connects the output of pressurizer 3 through resistance R 5, "-" input termination W1, the time constant circuit that its output termination W2 and C2 form, the latter then forms circuits for triggering with unijunction transistor T3, output trigger impulse voltage on resistance R 7, send the control utmost point of SR4, executive circuit 6 is one group of bidirectional triode thyristor SR1, SR2, SR3, they are in series with three-phase rotor winding respectively, the other end is short circuit then, and the silicon controlled control utmost point then connects the controller 5 of corresponding phase respectively.

In order to stabilize additional winding induced voltage jumpy, make synchro source provide comparatively stable alternating voltage to rectification circuit, in additional winding, seal in reactor L4, L5, L6 respectively.

Press the coiling electric motor that the utility model is made, its conducting that seals in the bidirectional triode thyristor in the rotor winding is controlled by synchro source voltage.At the beginning of electric motor starting, revolutional slip is 1, and additional winding induced voltage is higher, the thyristor operating angle maximum, along with motor speed raises, overwinding induced voltage step-down, thyristor operating angle are varied down to zero, then coiling electric motor rotor full speed running, at this moment, finish corresponding to motor starting process, like this, the bidirectional triode thyristor that utilizes one group of automatic control angle of flow and rotate with the axis reaches the purpose that leather falls slip ring, brush and start resistor and satisfies the coiling electric motor smooth starting simultaneously.The utility model since with additional winding induced voltage as control signal and energy source, so also have simple in structure, cost is low, be easy to the advantage making and adjust.

The utility model is described in further detail below with reference to accompanying drawing.

Fig. 1 is the utility model control section electrical schematic diagram;

Fig. 2 is the control section theory diagram;

Fig. 3 is a fixedly schematic diagram of component.

Stator in the utility model, rotor etc. are all identical with common coiling electricity, and only the required electric energy of control signal and circuit is provided by additional winding L 1, L2, L3, and overwinding and rotor winding also are stored in the rotor slot.But separate with insulating paper between them.Umber of turn is about with 2～10% of machine rotor umber of turn.And winding is pressed winding coiling, the rule of rotor winding and is connected.The voltage that additional winding is induced depends on the revolutional slip of rotor, and when revolutional slip was 1, induced voltage was the highest, and during operate as normal, induced voltage is minimum.

This voltage becomes pulsating dc voltage after rectifier 2 rectifications, C1 is a filter capacitor, and R1, W1, R2 constitute one fen voltage regulator circuit.Pressurizer 3 is by transistor T 1, T2, voltage-stabiliser tube DW and biasing resistor R3 form, T1, T2 are connected into composite tube type, it is the base stage that the emitter of T1 meets T2, the collector electrode of T1 connects the collector electrode of T2 through R4, and its base stage voltage-stabiliser tube DW provides reference voltage by the latter, the emission of T2 is the output of pressurizer very, and its collector electrode is as the output of the input termination rectifier of pressurizer.

The effect of controller 5 is the triggering signals that produce a reflection motor speed height, removes to control the angle of flow of bidirectional triode thyristor.In this partial circuit, the output voltage of transport and placing device IC raises with motor speed.W2 is used for the time constant of regulating circuit.R6, R7 are respectively T3 base loop resistance, and by R7 and C2 decision capacitance discharges time constant, thereby it has also just determined the width of pulse voltage.The positive pulse of R7 output is connected to the control utmost point of SR4, exports control signal again by the latter and removes to control bidirectional triode thyristor SR1(or SR2, SR3) triggering.Bidirectional triode thyristor is connected in the loop of rotor winding ZR.Like this, constituted " equivalent resistance (the resisting) " of rotor winding loop together by reactance of silicon controlled conducting internal resistance, rotor winding etc.

The drawn electrical schematic diagram of A phase control section of Fig. 1; all the other two-phases are identical with it; so omit; being chosen as of component parameter among the figure: rectifier diode; transistor is selected common silicone tube; transport and placing device is selected LM102 for use; optional BT31 of unijunction transistor or BT33; R6 is 300 Europe, and R7 is 150 Europe, and capacitor C 1 is 100 μ～200 μ; C2 is that 0.22 μ is at bidirectional triode thyristor SR1; SR2; the last piezo-resistance R8 in parallel respectively of SR3; R9; R10 etc.; so that protection L4 to be provided; L5; L6 is the electric controller of ribbon core, and its effect is to stabilize variation of AC voltage, from the effect of stabilizing; its inductance value is the bigger the better; but copper loss; power consumption increases, and electromagnet inertia also increases, thus excessive also be irrational.Usually can in 50～600mH scope, select, device parameters such as the R3 among the figure, R5, W1, W2, it is different and slightly different to look motor, selection principle is to manage to control the angle of flow of bidirectional triode thyristor, at the beginning of electric motor starting, be about 60 °, should reach about 0 ° after starting finishes, only in this way, just can make motor obtain favorable starting performance.

Whole controlling parts in the utility model can be weldingly fixed on respectively on three circuit boards by A, B, C three-phase, the latter then is fixed on the substrate of a regular shape (being illustrated as hexagon), this substrate is loaded on the axle, require the fixing symmetry as far as possible of circuit board, requirement for dynamic balance when satisfying the rotor high speed rotating, Fig. 3 schematic diagram of this fixed form that drawn.Certainly, also can adopt other fixed form according to the motor concrete condition.

Claims

1, a kind of coiling electric motor with the started with no brush device, it is by stator, rotor is formed, it is characterized in that, it is provided with the circuit of equivalent resistance in one group of control rotor loop, described circuit comprises synchro source 1, rectifier 2, pressurizer 3, controller 5 and executive circuit 6, wherein, synchro source 1 is additional winding L 1, L2, L3, it is embedded in the corresponding rotor slot with the rotor winding, the electric current of synchro source 1 induction is divided into two-way after rectifier 2 rectifications, one the tunnel send pressurizer 3, one road self-potential device W1 takes out and send controller 5, described controller 5 is by transport and placing device IC, unijunction transistor T3 and controllable silicon SR4 constitute, wherein, "+" input of transport and placing device IC connects the output of pressurizer 3 through resistance R 5, "-" input termination W1, the time constant circuit that its output termination W2 and C2 form, the latter then forms circuits for triggering with unijunction transistor T3, output trigger impulse voltage on resistance R 7, send the control utmost point of SR4, executive circuit 6 is one group of bidirectional triode thyristor SR1, SR2, SR3, they are in series with three-phase rotor winding respectively, the other end is short circuit then, and the silicon controlled control utmost point then connects the controller 5 of corresponding phase respectively.

2, coiling electric motor according to claim 1 is characterized in that sealing in reactor L4, L5, L6 respectively in additional winding L 1, L2, L3 loop.