CN2037105U

CN2037105U - Timer for step motor

Info

Publication number: CN2037105U
Application number: CN 88213772
Authority: CN
Inventors: 李民锋
Original assignee: TAISHAN ELECTROTHERMAL APPLIANCE FACTORY GUANGDONG PROV
Current assignee: TAISHAN ELECTROTHERMAL APPLIANCE FACTORY GUANGDONG PROV
Priority date: 1988-08-26
Filing date: 1988-08-26
Publication date: 1989-05-03

Abstract

The utility model provides a timer for a step motor. The values of a resistor or a capacitance in the control circuit of the step motor are regulated, the pulse interval of the current of the step motor is changed, so the average speeds of a rotor and a pit wheel of the step motor are changed, in the premise of not changing the stage number of a gear reducer, the manufacture of various time span size timers is realized, and the manufacturing cost is decreased. The timer has the advantages of strong reliability, continuous timing by automatically switching on a standby battery when the power supply is stopped, large load, etc.

Description

Timer for step motor

The utility model is the improvement to timer.

Normally used timer has mechanical timer (Mainspring type), synchronous machine timer, electronic timer, all there is shortcoming in these timers, mechanical timer can not regularly long (for example deciding more than 20 hours just very difficult), and poor reliability, be installed on the static utensil use especially serious.The synchronous machine timer can be decided for a long time, good reliability, but the timer of making multiple different time length specification then must change gear drive progression, just need to make many cover worker moulds, therefore cost is higher, and accuracy is subjected to the influence of ac frequency, can not timing during power failure.Though there is not above shortcoming in electronic timer, cost was higher when load current was big, if the then cost of band time showing is higher.

The utility model be carry out at the above shortcoming of timer improved, purpose be improve a kind of good reliability, can in very big time range, select to fix time, when making the timer of multiple time span specification, need not change worker's mould, cost not high, can connect reserve battery when having a power failure automatically and continue timing, can be with than large current load, the stepping motor timer of also indicating if having time.

Below in conjunction with accompanying drawing stepping motor timer of the present utility model is described in detail.Fig. 1 is a stepping motor timer construction schematic diagram of the present utility model, and Fig. 2 is this Stepping Motor Control circuit diagram.

Following concrete implementation method can realize the purpose of this utility model:

Motor timer of the present utility model is by motor, circuit for controlling motor, decelerator, the pit wheel, contact switch is formed (as shown in Figure 1), the work of circuit for controlling motor drive motors, the rotation of rotor 1 is delivered to pit wheel 2 by decelerator, the corresponding rotation of pit crop rotation, the surface 3 of pit wheel cooperates with the flange 6 of contact switch 5 in rotation with pit surface 4, the flange of contact switch is moved at the P point place that the wheel surface and the pit surface of pit wheel are joined, with and form the contact action of contact switch, this timer is characterised in that said motor is a stepping motor.

Following concrete execution mode also can be realized the purpose of this utility model:

Above-mentioned stepping motor control circuit (as shown in Figure 2) composed as follows:

A. by AC power V, resistance R 1, capacitor C 1, bridge rectifier D 1-D4, capacitor C 5, voltage-stabiliser tube DW, diode D5, DC power supply E and pit wheel linked switch K1-K2 form current input circuit, wherein alternating current V carries out bridge rectifier after capacitor C 1 step-down, again by capacitor C 5 filtering with by voltage-stabiliser tube DW voltage stabilizing, after M point output, the current potential that the voltage of DC power supply E is ordered a little less than M when alternating current is exported, diode D5 then eliminates the influence of alternating current to DC power supply E, therefore DC power supply E does not work when alternating current is exported, but when alternating current is not exported, the voltage of DC power supply E is higher than M point current potential, and the M point then becomes the output point of DC power supply E.

B. form multivibrator circuit by ic chip 555, capacitor C 2, C3, resistance R 2, R3, R4 change over switch N, wherein the 3a pin current potential of IC555 just changes and exports square wave pulsed current, and the numerical value of numerical value of change resistance R (for example change over switch N becomes connection R3 by connecting R2) or change capacitor C 2 can change the cycle of square wave pulsed current.

C. by load L(stepping motor), capacitor C 4 forms load circuit, wherein C4 is discharged and recharged by the square wave pulsed current of input, make the direction of the pulse current that flows through load L produce alternate, and make between two ALT pulses and leave the gap, thereby satisfied load L(stepping motor) needed current waveform during work.

Timer for step motor of the present utility model, outstanding advantage is when making the timer of multiple time span specification, need not change the progression of gear reduction unit, that is need be with multiple worker's mould, only need on its stepping motor control circuit, adjust easily corresponding resistance or electric capacity, can change the pulse period of stepper motor, thereby changed the mean speed of pit wheel, that is changed the time span specification of timer, thereby can under the prerequisite that does not change gear reduction unit progression, realize multiple time span specification, so that the manufacturing cost of timer reduces greatly, in addition, it is strong that this timer also has reliability, power off time is automatically connected reserve battery and is continued timing, can be with than large current load and the advantage such as change timing length class on the same timer where.

Claims

1, a kind of motor timer, by motor, circuit for controlling motor, decelerator, the pit wheel, contact switch is formed, the work of circuit for controlling motor drive motors, the rotation of rotor 1 is delivered to pit wheel 2 by decelerator, the corresponding rotation of pit crop rotation, the cam face 3 of pit wheel cooperates with the flange 6 of contact switch 5 in rotation with pit surface 4, the flange of contact switch is moved at the P point place that the cam face and the pit surface of pit wheel are joined, thereby form the contact action of the contact switch of contact switch, the feature of this timer is that said motor is a stepping motor.

2, motor timer according to claim 1 is characterized in that, said circuit for controlling motor is composed as follows:

A. by AC power V, resistance R 1, capacitor C 1, bridge rectifier D 1-D4, capacitor C 5, voltage-stabiliser tube DW, diode D5, DC power supply E and linked switch K1-K2 form power supply input circuit, wherein AC power V carries out bridge rectifier after capacitor C 1 step-down, again by capacitor C 5 filtering with by voltage-stabiliser tube DW voltage stabilizing, after M point output, the current potential that the voltage of DC power supply E is ordered a little less than M when alternating current is exported, diode D5 then eliminates the influence of alternating current to DC power supply E, therefore DC power supply E does not work when alternating current is exported, but when alternating current is not exported, the voltage of DC power supply E is higher than M point current potential, and the M point then becomes the output point of DC power supply E;

B. form multivibrator circuit by integrated package Ic555, capacitor C 2, C3, resistance R 2, R3, R4, change over switch N, wherein the 3a pin current potential of Ic555 just changes and the output wave pulse current, and the numerical value of numerical value of change resistance R (for example change over switch N becomes connection R3 by connecting R2) or change capacitor C 2 can change the cycle of square wave pulsed current;

C. by load L(stepping motor), capacitor C 4 forms load circuit, wherein C4 is discharged and recharged by the square wave pulsed current of input, make the direction of the pulse current that flows through load L produce alternate, thereby and make leave the gap between two ALT pulses and satisfied load L(stepping motor) needed current waveform during work.