CS232378B1 - Stepping electric motor for electronic watch - Google Patents

Abstract

The stepping motor for electronic clocks according to the invention supplies a higher load torque with a lower power consumption at the same time, and makes it possible to use cheaper permanent-magnet materials, primarily ferrite, for the rotor. The pole pieces of the stator laminates 1a, 1b are designed to be non-concentric with respect to the rotor 2 and have diametrically opposite recesses 11b whose height corresponds either to the thickness of a stator laminate layer 1c, 1d, at least two laminate layers being provided, or whose height is less than the thickness of the stator laminates, and only a single laminate layer need be provided. The recesses 11d are bounded by two straight lines X' and X'', the straight line X'' running through the rotor axis dividing the air gap 4 into two halves and enclosing an angle beta , which is greater than 15 DEG , with the Z-Z' axis. The straight line X' encloses an angle alpha of less than 130 DEG with the Z-Z' axis. Stator laminates without and with both types of recesses may be of different thickness. The invention can be used in all types of crystal-controlled electronic clocks having an analogue time display. <IMAGE>

Description

The invention relates to a stepper motor for an electronic clock for analog time display »

In the stepper motors are known embodiment »in any of ^H from the ^p Lead ^é piece stator shoulder ^Hoo towards ROTORK arranged concentrically, wherein the unambiguous rotational direction Rotortech dosa ^H U is the ^Yb Rani-clips in ^part stator ^p LEC ^Hoo» and embodiments in which the pole pieces relative to the stator laminations ROTORK positioned non-concentric, so that a gradual zúžení- air gap on both sides ROTORK direction mk its active poles, thereby ensuring ^no definite Nu ROTORK wiping direction.

It is known to ^{solution-mot.or to} step u, u ^M therefrom, the pole piece ^Star stator laminations relative ROTORK arranged concentrically, with some solutions are recesses on the inner periphery ^of pole pieces of the stator sheet at ^p farm is considerably in some solutions these recesses part of the stator plates.

Furthermore, it is known that a solution with an eccentric placement ^Pó lovýc ^h nosepiece ^at statorovýc ^hp LEC ^Hoo respect ^to ro ^t or u neohsahují the internal winning of ODU ^P ^ ol ^ CONFIG ^ stator plates so that they are integral.

A drawback of solution ^{- P} ol soustřddným position the pieces of stator laminations ROTORK respect is the fact that in the ^y Br ^and on the outside ^it ^ i ^ n ^ i ^{p - h} lovýc circuit ^after all ^of the ^U of the part ^b not used the stator laminations necessity exists k - achieving the desired direction of rotation of the rotor in order to achieve - a larger load torque against which the relatively small holding torque of the rotor acts.

A drawback with the solution by placing nnsotstřddnýe ol ^p pieces of stator laminations relative ROTORK skutečnoot is that the value of ^{F and} te ovacího niižší torque ratios of the ^Y value for holding Sokou - ROTORK torque.

232 378

The above-mentioned drawbacks are eliminated by the stepper motor for the electronic clock according to the invention, consisting of a coil exciter »of a two- and multi-blade permanent magnet rotor and opposed superposed stacked stator plate pairs. The rotor is formed by non-concentric and either recesses in the whole thickness of the stator sheets are provided with one to n-th pair of stator sheets of the total number of n pairs of stator sheets. n-th pair of stator sheets out of the total number of n pairs of stator sheets, the minimum number of pairs of stator sheets is equal to one and the recesses of both types are bounded by two lines, the line X - X ** closes with the Z-Z axis ou the gap between the stator plate pairs and the rotor in two halves and through the rotor axis an angle / 3 greater than 15 ° and the line X - X * forms an angle less than 130 ° with the Z - Z * axis.

At least one pair of stator sheets with a recess in a portion of the thickness of the stator sheet is of different thickness »or at least one pair of stator sheets with a recess throughout the thickness of the stator sheet is different thickness» at least one pair of total stator sheets of different thickness.

The advantages of the stepper motor for the electronic clock according to the invention consist in a substantial increase in the useful torque while reducing the mean current consumption and in the possibility of producing a permanent magnet rotor from inexpensive materials · for example ferrite »

The stepper motor for the electronic clock according to the invention will be described in more detail in the exemplary embodiment with the help of the attached drawings.

232 378 Figs. schematically the overall arrangement of stepper motor, consisting of a "stator lamination with pick ^and N im whole taoušlce tents. of stator. sheet integral fig · La Zn ^and have put forward savings ^asks the ^p roti method ^{of p} oložených stator laminations with a recess in the inner circumferences pollen projections throughout t-ioušíce stator laminations FIG · l ^{b Zn} zor ⁿ U is uspotad ^ i integral stator laminations, .

Fig. 2. It depicted U is ^N sc ^h emaaíck ^y - price arranged ^Ra d ^s Checks her motorbike whose stator plates - are rubbed OPA partial vybrtaím taouštce in tents.

· Figure 3 shows a ^row ez A - and the pole piece plates statarových stepper motor shown - in Figure 1 ·, and.

· Figure 4 Zn ^and have put forward cut В - В psovými extensions stator laminations stepper motor shown in Figure 2 · ·. Schemaaícky stepper motor arrangement shown to the electronic clock according to Figure 1 consists of · - excitation CTAK ³ from diameeráln ^greased otovan ^eh ^ a ^ a two- cellového to the rotor ² of permannnaníta. magnntu, ^{wherein p} oly ROTORK on. 1c, 1d, each provided with a recess 11b in the entire thickness of the stator plates on the inner periphery of their pole pieces shown in FIG. 1f, shown automatically in FIG. 1b. Arrangement of stator. For example, the plates 1c, 1d, 1d, 1e and 1l are shown in section A - A in Figure 3 for greater clarity. - In the case of stator plates, at least two light pairs form two opposite stator plates. one layer. These layers of stator sheets can then be layered on top of each other according to the desired total number. In this case, the stator plates can be situated opposite to each other in one line or opposite to the layers, i.e. outside the line.

232 378

Between the rotor 2 and the pole pieces on both sides of the stator plates 1c, 1d, 1e, 1f situated, a non-concentric air gap 4 shown in FIG. The opposite ends of the stator plates 1c, 1d, 1d, 1f, 1f are inserted into the exciter. third coil ^'p óiové. attachment plates statorovýc ^h lc, ld are ~ 'recessed · lib. 'made on the inside. circuit. in the entire length of the stator sheets. which is bounded by lines X-X * and X-X shown in Fig. 1a. wherein the angle β .. which encloses the line X - 'X ** with the axis Z ·' · Z * 'dividing the air gap 4 into. . the two halves and passing through the axis of the rotor 2 _t is greater than 15 °, and the angle θC that the straight line closes. X - X * p. ^Z -Z * I less than 130 °. ^In virtue ivemskut ^e »of lead attachment that ^{p p} LEC stator ^Hoo _l. Lc .. ld are situated non-concentric with respect to the rotor 2, having these. přímty X * X * X and X ** · over known ešením ^{of p} očátek rotorku- in axis ^2, and thence ^to SME ^of UUI e ^d emu ^the pole pieces on both sides of the stator laminations are situated lc. ld and mark a clear beginning. and the end . recesses 11b performed in its' entire thickness, j and ^k · ^e z is evident. FIG.

Arrangement. stepper motor for electronic clock with stator. Shoulder ^hy la ^ lb. p. by selecting the presses in the Houstice section, the stator panels shown in FIG. 2 is similar to that of FIG. 1, but with the exception that at least two stator plates 1a..1b can be used. The arrangement of the stator plates 1a, 1b shown in FIG. 2 is shown in section B-B in FIG. 4 for clarity.

If the excitation coil 3 is not energized.

maanntický flow is not created a.rotorek 2 remains in the ^known position ^p RICE ^Z is ^H protaimié the opposite pole ^{y C} No. The polarities which can be activated by applying a current pulse are found. on the line Y - Y *, they enclose the air gap 4 in two halves a with the ^Z - Z axis. prodiházeící ROTORK axis 2 an angle which is smaller ⁿ greater than ²⁰ °. A portion of the air gap 4 between the pole 2 of the rotor 2 and the pole piece of the stator plates 1a, 1b or 1c. ld. le, lf is minimal and it is cyclic maann ^{e t} _ro ok $ Tork ⁱⁿ yVolaný. magnet airway tube ² - maaiiaální which apply to ora US ^{P D,} or according to FIG.

and 2 · They went to. buddcí coil 3 supplied pulse current, this results - rise maanneického flow induced excitation windings - the coil 3 ф dvky opposite - the - direction to the magnetic near ^to it. 'Due to the stator ^p LEC .la ^{Hoo,' Ib} or Ic. 1d with both types of recesses according to FIG. and FIG. 2 is m ^ and ^ n ^ frenetic flow £ _c curve distributed so 'that can be - used in the form of a driving torque - substantially higher efficiency, while ^"- in place to select ^and the pin sets the ^p Úsobí the magnetic flow to rotor 2 at least. At the same time the oppimalizaci retaining шoшenPu Mp and the load, in particular knows ^ e ^ nominal m ^ n ^ tovanmc ROTORK 2 Direction wipe ROTORK 2 is uniquely determined in the direction zeθeíující ⁱⁿ _I ^D uc ^h <> ^Mo limits ^r y ⁴ FRI ^sou sonorous ^{m sm} ER ^{in flux} coil · £ 2 rotorek remains in its rest position. These variables can be expressed using the following model:

O “η ·“ p * “i +“ z ⁺ ® · f where sign -i:

..... шошппП drive which is formed by the ee ^l ic ^{e kt to} him by ^JF _c £ _in ky · stream induced impulse current winding buddcí

O O O e o es

...

coil 3 holding torque, which is the rotor. 2 is held in its rest position due to the mane ^{flux of the} rotor ^k against the frictional action against the driving torque, and - it comprises in itself the friction of the rotor 2 the maximum possible eoment which is possible at a certain value of. ^ 1 (^ i ^: he will use mommnt rotor 2 · “i

232 378 of M »4, thereby increasing the load torque value M

Use of stator plates la. lb or lc. Id. le. 1f with the non-concentric position of their pole pieces with respect to the rotor 2 with both said recesses 11a or 11b according to the invention results in a substantial reduction in the holding current value at the same time due to better utilization of the driving torque M1 as shown in the above equation. On the basis of these conditions it is possible to produce permanent magnet stepper motor rotors from cheap materials »mainly from ferrite»

The stepper motor according to the invention is applicable to all kinds of crystal controlled electronic clocks with analog time display.

Claims (4)

SCOPE OF THE INVENTION 232 378 The first stepping motor for an electronic clock, 'sestávájící'z excitation coil and two vícepójLovťího ROTORK erinannn from ^{p h} o ⁿ the magnet and opposed. together are situated at each layered pairs - stator ple ^ s ^{wherein, s} pó'lov piece statorovýc ^hp Lech (la, lb or lc, ld, le, lf) are non-concentric relative ROTORK shaped and either ^- vybtaním ^(11b) ' in ttatši cel ^E, ^ CE ^ stator plates (lc, ld) is provided with one through nl-th pair of stator laminations (lc, ld) of the n pairs of stator plates (lc, ld, le, lf). Wherein the minimum number of pairs of stator plates (1c, 1d, 1e, 1f) is equal to two or recesses (11a) in the Part. ^Hoo shoulder thickness stator (Ia Ib) is ^{of p} at the ^d en en to n-TY pair of stator plates (la, lb) of the n pairs of stator laminations - (la, lb), wherein rn.i ^] LmÍln: I number of pairs of stator plates (la, lb) is equal to one and a recess (11a, 11b) are formed by two opposing přímkaιni ^p of ^IR em ^{from p} římka X - X '' Vol ^I, R with the axis Z - Z * divider vz ^d preserve a gap (4) between ^{Fr Ry} stator laminations - (la, lb or lc, ld, le, lf) and ROTORK - (2) into two halves and procházeeící axis ROTORK (2) angle - - bigger than the ¹⁵ ° and the line ^χ - iK closes with the ^Z - Z axis. Angles Less ^than 130 ° Second stepper mooorek electronic clock according to claim 1, characterized in that at least one pair of stator plates (la, lb) with a recess (Ha) in part ^- the thickness ^h with a stator shoulder is J.iá ^ n ^ ^s ^ alkyl thickness -. Third 'stepping motor for an electronic clock according to claim 1, - wherein at least one pair of stator laminations (LC, LD) with a recess (11Ю ce.l.é the thickness e of the stator ^ ^- sheet is odltané tlouHky. 4. A stepper mooor for electronic clocks according to claim 1, characterized in that at least one pair of solid stator plates (1e, 1f) is different from one another.