CN2251223Y

CN2251223Y - Single-phase ac electric machine for agriculture

Info

Publication number: CN2251223Y
Application number: CN 95237378
Authority: CN
Inventors: 谭锐; 史凤仙
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-01-12
Filing date: 1995-08-08
Publication date: 1997-04-02
Anticipated expiration: 2005-08-08

Abstract

The utility model relates to a single-phase AC motor for the voltage of rural power network within 144V to 250V, which is composed of a motor and a control protector. The motor is composed of the existing motor winding whose wire diameter is increased and series coils which are additionally provided with two or more winding tapping. The control protector is composed of a power supply circuit, a basic value circuit, a comparison circuit, a control executive circuit, and a protection executive circuit. The single-phase AC motor has excess voltage, excess voltage, and hot protections. The motor can run under normal voltage, and can also run under low voltage. The utility model has the advantages of reliable performance, complete functions, and simple structure.

Description

Agricultural load motor

The utility model is a kind of load motor that is applicable to rural power grids voltage at 144V-250V.

At present, China's rural power grids voltage is generally on the low side, sometimes voltage has only about 150V, the load motor that this makes existing extensive use can't use in the rural area, influences electronic product applying in the rural area, rural economic development is restricted, therefore developing a kind of can be the rural area task of top priority at the motor of normal voltage operation again at subnormal voltage operation in fact both.

The purpose of this utility model provides a kind of rural power grids voltage that is applicable in 144V-250V operation, and the agricultural load motor of overvoltage, under-voltage, heat protection is arranged.

The utility model is achieved in that agricultural load motor is made up of motor and control protector two parts, motor is increased the line footpath of its winding by existing motor, and set up the series coil of tapping more than two or two and convert, other partly needn't be changed; The control protector is by power circuit, base value circuit, comparison circuit, control executive circuit and protection executive circuit constitute more than two or two; power circuit provides The whole control protector power supply; and the double as supply voltage detects sample circuit; the base value circuit is made up of electric resistance partial pressure, and the protection executive circuit is made up of overvoltage, under-voltage and thermal protection circuit.

This motor has simple in structure, reliable advantage; it can realize self shifter along with the reduction of line voltage; dependable performance; both can move in normal voltage; again can be at subnormal voltage operation, and have overvoltage, under-voltage, heat protection, multiple functional; can be widely used in the rural area, apply electromechanical equipment for the rural area reliable guarantee is provided.

Below in conjunction with accompanying drawing the utility model is described in further detail:

Fig. 1 is the control protector circuit diagram of agricultural load motor

Wherein [I] is power circuit, base value circuit diagram

[II] is comparison circuit figure

[III] is control executive circuit figure

[IV] is protection executive circuit figure

Fig. 2 is the motor winding diagram

Agricultural load motor is made up of motor and control protector two parts.Motor is converted by existing motor, promptly increases the line footpath of primary winding, and set up two or two above taps on the winding that increases the line footpath, specifically is calculated as follows:

1. sectional area of wire main winding A ' _m=1.4A _m(millimeter ²)

Pay winding A ' _a=1.4A _a(millimeter ²)

A in the formula _m, A _MSectional area for the original motor winding

2. motor windings is made up of 3 series coils:

(1) 160V winding W ' _m=0.7W _m

W′ _a＝0.7W _a

(2) 180V winding W ' _m=0.8W _m

W″ _a＝0.8W _a

(3) 220 winding W _m, W _a

M is the number of turn for main winding a for paying winding W in the formula

3. the running capacitance is constant

4. starting capacitance amount: C ' _Q=1.68C _Q

C _QFor former serial motors starts electric capacity.

With reference to Fig. 1, the control protector is by power circuit I, base value circuit I, comparison circuit II, control executive circuit III and protection executive circuit IV constitute more than two or two, power circuit is by transformer B1, bridge rectifier Q1, filtering C1-C4, three terminal regulator T1 forms, The whole control protector power supply is provided, and utilize transformer B1, rectification Q1 filtering C1 and resistance R 5, R6 double as supply voltage detect sample circuit, send and detect the voltage signal that voltage is directly proportional, send into LM339 comparator (V1:A.B.C.D); Base value circuit 1 is formed four component volt circuits by resistance R 10-17 and is exported four voltage signals respectively, respectively sends into four comparators and sampled signal and compares, and comparison circuit II is made up of a LM339 comparator V1:A-D and resistance R 1-4; Control executive circuit III forms the second gear circuit respectively by 4069 phase inverter V2:E, V2:F, power tube G1, G2 and relay J 1, J2, and one grade is 180V, and one grade is 200V; The overvoltage protection of protection executive circuit is made up of 4069 phase inverter V2:A, diode D1, power tube G3 and relay J 3; under-voltage protection is made up of 4069 phase inverter V2:B, C, diode D2, power tube G3 and relay J 3, and the heat protection is made up of temperature relay TX and relay J 3.When line voltage is lower than 200V; then comparator V1:A outputs signal to phase inverter V2:E; make power tube G1 conducting; relay J 1 gets electronic work; motor is sent into one grade of operation of 200V; when line voltage was lower than 180V, then comparator V1:B outputed signal to phase inverter V2:F, made power tube G2 conducting; relay J 2 gets electronic work; motor is sent into one grade of operation of 180V, and when line voltage was higher than 250V, then comparator V1:C outputed signal to phase inverter V2:A; make power tube G3 conducting; drive relay J 3, cut off power supply, realize overvoltage protection.When line voltage was lower than 144V, then comparator V1:D outputed signal to phase inverter V2:B, and C in like manner drives relay J 3, cut off power supply, realized under-voltage protection.When motor temperature surpasses 80-110 ℃, make the c that is connected to power tube G3, the normally opened contact closure of the temperature relay TX between the e utmost point, drive relay J 3 actions, cut off power supply, reach the purpose of heat protection motor.

Claims

1. load motor that is applicable to rural power grids voltage at 144V-250V; it is made up of motor and control protector; it is characterized in that motor is increased the line footpath of its winding by existing motor; and set up the series coil of tapping more than 2 or 2 and make; the control protector is by power circuit [I]; base value circuit [I]; comparison circuit [II]; control executive circuit [III] and protection executive circuit [IV] formation more than two or two; power circuit provides The whole control protector power supply; and the double as supply voltage detects sample circuit; the base value circuit is made up of electric resistance partial pressure, and the protection executive circuit is by overvoltage; under-voltage and thermal protection circuit is formed.

2. load motor according to claim 1, it is characterized in that power circuit [I] is made up of transformer [B1], bridge rectifier [Q1], filter (C1-C4), three terminal regulator [T1], and utilize transformer [B1] rectification [Q1], filtering [C1], form supply voltage with resistance [R5.R6] and detect sample circuit.

3. load motor according to claim 1 is characterized in that base value circuit [I] forms four component volt circuits by resistance [R10-17].

4. load motor according to claim 1 is characterized in that comparison circuit [II] forms No. four comparison circuits by four comparators [V1:A-D] or LM339 comparator and resistance [R1-4].

5. load motor according to claim 1 is characterized in that controlling executive circuit [IV] and is made up of phase inverter [V2:E-F], resistance [R19, R20], power tube [G1, G2] and relay [J1, J2].

6. load motor according to claim 1; it is characterized in that protecting the overvoltage protection of executive circuit [IV] to form by phase inverter [V2:A], diode [D1], power tube [G3] and relay [J3]; under-voltage protection is made up of phase inverter [V2:B, C], diode [D2], power tube [G3] and relay [J3], and the heat protection is made up of temperature relay [TX] and relay [J3].