CN2408438Y

CN2408438Y - Pointer type indicator for micro stepping motor drive

Info

Publication number: CN2408438Y
Application number: CN 00205136
Authority: CN
Inventors: 杨友修; 陈达渊
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-02-16
Filing date: 2000-02-16
Publication date: 2000-11-29
Anticipated expiration: 2010-02-16

Abstract

The utility model relates to a pointer type indicator which is driven by a minisize step motor, and an upper flat plate 3 and a lower flat plate 1 are mutually supported through a column 10. A speed reducer 14 is installed between the upper flat plate 3 and the lower flat plate 1. A forward rotation minisize step motor 9 and a reversal rotation minisize step motor 8 are installed on the lower side of the lower flat plate 1, and the rotating shafts of the forward and the reversal rotation minisize step motors are respectively and fixedly connected with the speed reducer. A pointer 12 is arranged on the upper flat plate 3 and is fixedly connected with an output shaft 15 of the speed reducer 14. The speed reducer 14 is composed of a combined gear 5, a forward rotation motor gear 2, a reversal rotation motor gear 7 and a central gear 11. The utility model has the advantages of low cost, good reliability and small size.

Description

The pointer-type indicator that micro-step motor drives

The utility model relates to the indicating device of pointer instrument, specifically is the pointer-type indicator that a kind of micro-step motor drives.

Pointer-type indicator is meant the indicating device of representing numerical value with the angle of pointer rotation.Though digital display technique high development now, but because pointer instrument has intuitive display, reliable operation, advantage such as cheap, this indicator still is widely used in a lot of fields, the clock and watch of using in the velometer of using on various electrical instruments and other industrial instruments, the vehicle, the daily life etc. all adopt pointer-type indicator.

Existing pointer instrument, its indicating device has magneto-electric, electromagnetic type etc., and utilizes flexible member or other responsive deformation element.But in some special special application scenario, adopt said structure that certain difficulty is then arranged, the cost height that has, the conversion difficulty that has, the anti-seismic performance that has does not satisfy requirement, particularly will directly be converted to the indication angle to digital quantity, all need be through several mould conversions, this has just increased cost, has reduced reliability.Stepper motor can directly become the anglec of rotation to the pulse signal, and very accurate.

The purpose of this utility model is at existing pointer instrument, when its indicating device is applied in some special special occasions, there are problems such as cost height, conversion difficulty, poor reliability, provide that a kind of cost is low, good reliability, volume be little, when being used for intelligent instrumentation, the pointer-type indicator that the micro-step motor that the pulse signal of computer output directly can be driven after simple power amplification drives.

The pointer-type indicator that micro-step motor described in the utility model drives, comprise can only folk prescription to the just commentaries on classics micro-step motor of running, counter-rotating micro-step motor, upper flat plate, dull and stereotyped, pointer and reduction gear down.Upper flat plate and following flat board support mutually by column.Reduction gear is installed between upper flat plate and the following flat board.Two micro-step motors be loaded on down dull and stereotyped below, its rotating shaft is connected mutually with reduction gear.Pointer is positioned on the upper flat plate and with the output shaft of reduction gear and is connected mutually.

Said reduction gear is made of composite gear, positive rotating motor gear, reverse motors gear and central gear.Composite gear is made of coaxial pinion wheel and gear wheel.Positive rotating motor gear and reverse motors gear are separately fixed at just to change in micro-step motor and the rotating shaft of counter-rotating micro-step motor and with the composite gear gear wheel and mesh.Central gear and composite gear pinion.The rotating shaft that pointer is installed in central gear is on the output shaft.Also be equipped with on the central gear for pointer and return the contact pin of zero-bit.

During work, when just changeing stepper motor and pass to the pulse of positive and negative alternation, positive rotating motor gear just clockwise rotates, positive rotating motor gear and the engagement of composite gear gear wheel, so composite gear gear wheel inhour is rotated, and composite gear pinion wheel and the central gear engagement coaxial with the composite gear gear wheel clockwise rotate central gear, just clockwise rotate with the coaxial mounted pointer of central gear.When just changeing micro-step motor and rotate, counter-rotating micro-step motor no power is drivenly followed rotation.When counter-rotating stepper motor when passing to the pulse of positive and negative alternation, reverse motors gear just inhour rotates, according to positive phase inversion with drive path, drive the pointer inhour and rotate.

Elder generation's steering needle counter-rotating during each start, when contact pin contacts the rear motor stall with the contact of circuit, the position of pointer is exactly zero point at this moment.

The utility model has the advantages that cost is low, good reliability, volume be little, when being used for intelligent instrumentation, the output pulse signal of computer directly can be driven after simple power amplification, of many uses, as be used for the instrument of Moped Scooter, indication mileage, speed and cell voltage or capacity etc.

Fig. 1 is the structural map of the pointer-type indicator of the utility model micro-step motor driving;

Fig. 2 is the A-A cut-open view of Fig. 1;

Fig. 3 is the B-B cut-open view of Fig. 1;

Fig. 4 is the utility model micro-step motor driving circuit figure.

The utility model is described in further detail below in conjunction with embodiment shown in the drawings:

As shown in Figure 1-Figure 3, the pointer-type indicator that micro-step motor described in the utility model drives, comprise can only folk prescription to the just commentaries on classics micro-step motor 9 of rotation, counter-rotating micro-step motor 8, upper flat plate 3, dull and stereotyped 1, pointer 12 and reduction gear 14 down.Upper flat plate 3 and following dull and stereotyped 1 supports mutually by column 10.Reduction gear 14 is installed between upper flat plate 3 and following dull and stereotyped 1.Just changeing micro-step motor 9, the counter-rotating micro-step motor 8 be loaded on play the flat board 1 below, its rotating shaft is connected mutually with reduction gear respectively.Pointer 12 is positioned on the upper flat plate 3, and is connected mutually with the output shaft 15 of reduction gear 14.

Said reduction gear 14 is made of composite gear 5, positive rotating motor gear 2, reverse motors gear 7 and central gear 11.Composite gear 5 is made of pinion wheel 4 and gear wheel 6.Positive rotating motor gear 2 and reverse motors gear 7 are separately fixed in the rotating shaft of just changeing micro-step motor 9 and counter-rotating micro-step motor 8 and with composite gear gear wheel 6 and mesh.Central gear 11 and 4 engagements of composite gear pinion wheel.The rotating shaft that pointer 12 is installed in central gear is on the output shaft 15.Also be equipped with on the central gear 11 for pointer and return the contact pin 13 of zero-bit.

Each gear number of teeth in the reduction gear 14, the angle that can turn over according to desired each pulse pointer is that pulse equivalency is determined.If positive rotating motor gear 2 numbers of teeth are Z1, reverse motors gear 7 numbers of teeth are Z1 ', composite gear gear wheel 6 numbers of teeth are Z2, composite gear pinion wheel 4 numbers of teeth are Z2 ', central gear 11 numbers of teeth are Z3, and the step angle of micro-step motor is 180 °, as require a pulse pointer to turn over 3 °, then the number of teeth of each gear can be used: Z1=Z1 '=Z2 '=12, Z2=Z3=93.Trying to achieve pulse equivalency is:

Figure 4 shows that micro-step motor driving circuit figure of the present utility model.Among the figure, MPU is the single-chip microcomputer of any model, and P0, P1, P2, P3 are its delivery outlet, and T1, T3, T5, T7 are general PNP triode, and T2, T4, T6, T8 are general NPN triode.With the driving of just changeing micro-step motor 9 (M1) is example:

As P0, P1 when all being high, T2, T4 are logical, but T1, T3 are obstructed, can not form current path, the motor no power, and as P0, P1 when all be low, T1, T3 lead to, but T2, T4 are obstructed, and circuit is still obstructed.When P0 is low, when P1 was high, T1, T4 were logical, and T2, T3 are obstructed, and electric current can flow through motor by following route :+5V → T1 → M1 → T4 → ground, and when P0 be high, P1 is when low, T2, T3 lead to, T1, T4 are obstructed, motor also can pass through electric current, but current opposite in direction.Motor just can be by the positive and negative pulse current that replaces like this, thereby rotates to a direction.

Claims

1. the pointer-type indicator that drives of a micro-step motor is characterized in that: comprise can only folk prescription to the just commentaries on classics micro-step motor of running, counter-rotating micro-step motor, upper flat plate, dull and stereotyped, pointer and reduction gear down; Upper flat plate and following flat board support mutually by column, and reduction gear is installed between upper flat plate and the following flat board; Two micro-step motors be loaded on down dull and stereotyped below, its rotating shaft is connected mutually with reduction gear; Pointer is positioned on the upper flat plate and with the output shaft of reduction gear and is connected mutually.

2. by the pointer-type indicator of the described micro-step motor driving of claim 1, it is characterized in that: said reduction gear is made of composite gear, positive rotating motor gear, reverse motors gear and central gear; Composite gear is made of coaxial pinion wheel and gear wheel, positive rotating motor gear and reverse motors gear are separately fixed at just to change in micro-step motor and the rotating shaft of counter-rotating micro-step motor and with the composite gear gear wheel and mesh, central gear and composite gear pinion, the rotating shaft that pointer is installed in central gear is on the output shaft, also is equipped with on the central gear for pointer to return the contact pin of zero-bit.