CN201118204Y - Electric motor temperature protector - Google Patents

Abstract

The utility model belongs to a motor protection device, in particular to a motor temperature protection device, which consists of a power circuit (1), a display circuit (2), a control circuit (4), a three-phrase alternating current contactor (5) and a voltmeter (6); the system is provided with a temperature sensing circuit (3) and a two-phrase alternating contactor (7); temperature detection resistances R<11>, R<12> and R<13> in the temperature sensing circuit (3) are connected in parallel, one end of the circuit is connected with the base electrode of a dynatron BG<3>, and the other end is connected with resistances R<3>, R<5>, R<8>, R<16> R<17>, one end of a zener diode D<10>, the anode of an electrolytic capacitor C<4> and the emitting electrode of a dynatron BG<1>; the control circuit (4) is provided with a diode D<17>; one end of the diode D<17> is connected with the emitting electrode of a dynatron BG<4>, the resistance R<6> and one end of the voltmeter (6), while the other end is connected with the resistance R<7> and one end of an R<9>. The protector has the advantages of simple structure, reliable performance, convenient use and installation.

Description

The motor temperature protective device

Technical field

The utility model belongs to motor protecting device, particularly a kind of motor temperature protective device.

Background technology

At present, motor protecting device is more, and is very necessary for overload protection, if the electromotor overload time is grown or often transships, will burn out coil of stator of motor, and motor can not be worked, and not only influence is produced, and also can cause very big waste.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned technical deficiency, and a kind of simple in structure, motor temperature protective device that reliability is high is provided.

The technical scheme that the utility model technical solution problem adopts is: a kind of motor temperature protective device of forming by power circuit, display circuit, control circuit, three A.C. contactors and voltmeter, and basic characteristics are to be provided with temperature sensing circuit and binomial A.C. contactor in system; Temperature detecting resistance R in the temperature sensor circuit ₁₁, R ₁₂, R ₁₃Parallel connection, a termination triode BG ₃Base stage, other end connecting resistance R ₃, R ₅, R ₈, R ₁₆, R ₁₇, voltage stabilizing didoe D ₁₀Anodal and the triode BG of one end and electrochemical capacitor C4 ₁Emitter; 1 pin of binomial A.C. contactor meets fuse BX ₄Three ac contactor coil L in one end, three A.C. contactors ₁An end and button K ₂An end, 2 pin meet fuse BX ₃An end and transformer B in transformer coil L ₄An end, 3,4 pin connect the 220V power supply, binomial ac contactor coil L ₃6～2 pin of a relay termination J and three ac contactor coil L in three A.C. contactors ₁An end, another termination K ₂The other end; In control circuit, be provided with diode D ₁₇, D ₁₇A termination triode BG ₄Emitter, resistance R ₆With an end of voltmeter, other end connecting resistance R ₇And R ₉An end.

The beneficial effects of the utility model are: this protector structure is simple, and dependable performance is easy to install.

Description of drawings

Specify with embodiment below in conjunction with accompanying drawing.

Fig. 1 shows motor temperature protective device schematic circuit.

Among the figure, the 1-power circuit; The 2-display circuit; The 3-temperature sensor circuit; The 4-control circuit; Three A.C. contactors of 5-; The 6-voltmeter; 7-binomial A.C. contactor; The B-transformer; D ₁-D ₄, D ₅-D ₈-rectifier bridge; BX ₁-BX ₄-fuse; L ₁-three ac contactor coils; L ₂-relay coil; L ₃-binomial ac contactor coil; L ₄～L ₆-transformer coil; BG ₁-BG6-triode; D ₉, D ₁₀-voltage stabilizing didoe; D ₁₁-D ₁₄, D ₁₅, D ₁₆-light-emitting diode; D ₁₇-diode; C ₁-C ₅-electrochemical capacitor; R ₁-R ₁₀, R ₁₄-R ₁₇-resistance; R ₁₁-R ₁₃-temperature detecting resistance; The W-variable resistor; K ₁, K ₂-switch; The J-relay;

Embodiment

With reference to accompanying drawing, a kind of motor temperature protective device is made up of power circuit 1, display circuit 2, control circuit 4, three A.C. contactors 5 and voltmeter 6, and basic characteristics are to be provided with temperature sensing circuit 3 and binomial A.C. contactor 7 in system; Temperature detecting resistance R in the temperature sensor circuit 3 ₁₁, R ₁₂, R ₁₃Parallel connection, a termination triode BG ₃Base stage, other end connecting resistance R ₃, R ₅, R ₈, R ₁₆, R ₁₇, voltage stabilizing didoe D ₁₀One end, electrochemical capacitor C4 positive pole and triode BG ₁Emitter; 1 pin of binomial A.C. contactor 7 meets fuse BX ₄Three ac contactor coil L in one end, three A.C. contactors 5 ₁An end and button K ₂An end, 2 pin meet fuse BX ₃An end and transformer B in transformer coil L ₄An end, 3,4 pin connect the 220V power supply, binomial ac contactor coil L ₃6～2 pin of a relay termination J and three ac contactor coil L in three A.C. contactors 5 ₁An end, another termination K ₂The other end; In control circuit 4, be provided with diode D ₁₇, D ₁₇A termination triode BG ₄Emitter, resistance R ₆With an end of voltmeter 6, other end connecting resistance R ₇And R ₉An end.

Power circuit 1 is by power transformation device B, rectifier bridge D ₁-D ₄, D ₅-D ₈, fuse BX ₁-BX ₄, transformer coil L ₄-L ₆Form; Rectifier bridge D ₁-D ₄1 pin meet BX ₁An end, 2 pin ground connection, 3 pin meet L ₅An end, the electrochemical capacitor C in the 4 pin connection control circuits 4 ₁Positive pole, resistance R ₁₅One end and three ac contactor coil L ₂An end; BX ₁Another termination L ₅The other end; D ₅-D ₈1 pin meet BX ₂One end, 2 pin ground connection; 3 pin meet L ₆An end, the resistance R in the 4 pin connection control circuits 4 ₁₄, R ₁One end, electrochemical capacitor C ₂Positive pole, triode BG ₁, BG ₂Collector electrode; L ₆, BX ₂The other end join; BX ₄, L ₄The other end join; BX ₃Three 1 pin that exchange contact-relay J of another termination.

Display circuit 2 is by light-emitting diode D ₁₁-D ₁₄Form; D ₁₁, D ₁₂Series connection, D ₁₃, D ₁₄Series connection, D ₁₁, D ₁₃Also ground connection in parallel, D ₁₂, D ₁₄Parallel connection also meets R ₁₇One end;

Control circuit 4 is by triode BG ₁-BG ₆, voltage stabilizing didoe D ₉, D ₁₀, diode D ₁₇, light-emitting diode D ₁₅, D ₁₆, relay J, relay coil L ₂, electrochemical capacitor C ₁-C ₅, resistance R ₁-R ₁₀, R ₁₄-R ₁₇Form with variable resistor W; BG ₁Base stage meet BG ₂Emitter; BG ₂Base stage meet D ₉An end, C ₃Positive pole and R ₁The other end; BG ₃Emitter meet R ₃The other end, collector electrode meets BG ₄Base stage and R ₄An end, BG ₄Collector electrode meet R ₅The other end; BG ₅Base stage meet R ₇The other end, collector electrode meets D ₁₆An end, emitter meets R ₁₀An end, the other end of voltmeter 6, R ₆, R ₄3,2 pin of the other end, W, D ₉The other end, C ₃Negative pole, R ₁₄The other end and ground; BG ₆Base stage meet R ₉The other end, collector electrode meets L ₂An end and C ₅Positive pole, emitter meets R ₁₀The other end and C ₅Negative pole; R ₁₅Other end ground connection; C ₁, C ₄Minus earth; D ₁₀Another termination R ₂An end, R ₂1 pin of another termination W.

7,8,9 pin of three A.C. contactors 5 connect three power supplys.10,11,12 pin connect motor.

Claims (1)

1, a kind of motor temperature protective device, be made up of power circuit (1), display circuit (2), control circuit (4), three A.C. contactors (5) and voltmeter (6), base is characterised in that and is provided with temperature sensing circuit (3) and binomial A.C. contactor (7) in system; Temperature detecting resistance R in the temperature sensor circuit (3) ₁₁, R ₁₂, R ₁₃Parallel connection, a termination triode BG ₃Base stage, other end connecting resistance R ₃, R ₅, R ₈, R ₁₆, R ₁₇, voltage stabilizing didoe D ₁₀One end, electrochemical capacitor C ₄Positive pole and triode BG ₁Emitter; 1 pin of binomial A.C. contactor (7) meets fuse BX ₄Three ac contactor coil L in one end, three A.C. contactors (5) ₁An end and button K ₂An end, 2 pin meet fuse BX ₃An end and transformer B in transformer coil L ₄An end, 3,4 pin connect the 220V power supply, binomial ac contactor coil L ₃6～2 pin of a relay termination J and three A.C. contactors (5) in three ac contactor coil L ₁An end, another termination K ₂The other end; In control circuit (4), be provided with diode D ₁₇, D ₁₇A termination triode BG ₄Emitter, resistance R ₆And an end of voltmeter (6), other end connecting resistance R ₇And R ₉An end.