DE2358030A1 - COLLECTORLESS DC MOTOR - Google Patents

Description

PAPST - MO / OHüHJ'KG 16.11 »1973

"" .. _ο , ΐ. 055-Rai / Ar

774-2 St./ Georgen. DT-162

Brushless DC motor (addition to P 23 32 01.2.9)

The invention relates to a brushless direct current motor with a permanent magnet ring serving as a rotor, one on the stator arranged, in the Betrieft a gap having electromagnetic Winding generating the drive torque, furthermore with at least one soft iron element extending into the stray field area on the inner or outer circumference of the rotor for storing magnetic energy during the duration of the electromagnetic drive torque and for emitting this energy in the gaps in this drive, according to patent application P 23 32 012.9. . '

The associated main application gives the teaching to generate a the electromagnetic drive torque supplementary magnetic torque, which is referred to in the following as reluctance torque becomes, at least one ferromagnetisch.es element - in the following briefly called soft iron element - to be used, which extends into the S "creuflußüereich of the rotor magnet.

It has now been shown that in motors of this type in some Applications the need is given to the size of this reluctance torque adjustable within certain limits make in order to enable an optimal adaptation of such a motor to the respective application and the smoothness to optimize the engine,

According to the invention, this is the case with a motor mentioned at the beginning achieved in that the soft iron element is arranged on a stationary part of the motor, adjustable, and that a Actuator for setting the distance between the soft iron element and rotor circumference is provided. The adjustable arrangement

509821/0586

-?. - November 16, 1973

tion can depending on the egg constructive design of such Motor can be done in many places, e.g. B. on αer stator plate, on a motor housing or also on a non-motor Connected device part "The actuator is expediently arranged in such a way that that it is easily accessible and easy to adjust enables.

Further details and advantageous developments of the invention result from the and described in the following Embodiments shown in the drawing. Show it {

Figure 1 is a longitudinal section through an inventive Brushless DC motor, seen along the line I-I of Figure 2,

Figure 2 is a section, seen along the line 11-11 of Figure 1, and

FIG. 3 shows a section analogous to FIG. 2 through a second Embodiment of the invention.

The motor shown in FIGS. 1 and 2 is a 4-pole brushless direct current motor 10, the stator 11 of which has an insulating plate 12 which is fastened to a ferromagnetic motor housing 13. The plate 12 carries a printed circuit (not shown) with the electronic switching elements of the motor 10, and it has two recesses 15, 16, in each of which an ironless flat coil 20 and 21 is glued. The shape of these coils 20, 21 is indicated in FIG. 2. The coils 20, 21 are mutually offset by 180 ° mechanically = 360 ° electrically P 22 25 44-2.8 _{or similar}

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In its center, the plate 12 is penetrated by a shaft 30, which is mounted in a bearing 29 in the housing. 13 are on the shaft 30, held at a precise distance from each other by a spacer sleeve .31 in., Two soft iron disks 32 and 33 attached. On our disk 32 is 4-pole, magnetized axially he ring magnet 34. glued one on whose Pollückeh radial "extend. The individual poles of this ring magnet 34 are in the usual way indicated by the letters H and S _o -The induction on the abge-wound ring magnet 34 has - a substantially trapezium-shaped profile, as described in the parent application isto the ■ Weicheirjenscheibe 33 serves as: a rotating magnetic yoke An.ihr could, when a higher induction is needed in the air gap _36,;.. ., a second ring magnet are fixed, in which case naturally the distance between the disks 32 and-33's top sein..müßte. "-;

On the inner circumference of the housing 13, around .360 electrical connections are made. geneinan he offset, two pieces of sheet metal 41st, 42 made of soft iron fastened by means of rivets 43, 44 o The sheet metal pieces 41 and 42 are identical, so that a description of the sheet metal piece 41 enough. This is, as shown, on. a first section 45 facing the inner wall ". ' of the housing 13 clings to attached to the latter; and goes over to a linkage. Ending section 46, which is a twist, of sheet metal piece 41 relative to the housing 13 and thus relative to the. Outer circumference 47 of the rotor magnet 34 allows. Following the section 46 follows in an angular range alpha a section 48 in which - in the direction of rotation. 49. seen .-- the effective distance between the bloclist 41 and c.em circumference 47 rapidly reduced in size, and ciarauf fol /; t to the.-free end .. of the breaking piece 41 in an angle cj he calibrate beta a section 50 in which this radial distance seen in the direction of rotation slowly.like, er enlarged,

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D.

-if - 11/16/1973

At section 50, the free end of one engages as an actuator serving screw 53; by locking this screw The distance between the small strips 41 and the circumference 47 can be increased or decreased -./ earth: if the distance is increased, so the reluctance torque becomes smaller; v: If it is reduced, • the reluctance torque becomes greater «- To adjust the strip 42 an adjusting screw 54 ° is used in an analogous manner Both strips 41 and 42 are expediently adjusted in the same sense in order to exert a one-sided radial tensile force on the Rotor magnets 34 to avoid ν.

In some cases, the embodiment of Figure 3 even more suitable because of the nit there designated 60 V / iron calibration strip or on both of its ends by means of nesting 61 _o 62 on the housing 13 is mounted. The adjusting screw 63 causes here - as can be seen from the drawing - a somewhat ariuere type of deformation of the strip 60, as this z. B. in the strip 41 or 42 of the Pail iüt. An advantage of the arrangement according to FIG. 3 is that the strip 60 cannot carry out any undesired vibrations.

As with the engine after the J ^ auptanmeldung can for everyone Pole of the rotor magnet 34 provided a separate strip of soft iron; but it has been shown that smaller Moments can also be generated with a smaller number of strips, e.g. B. as shown with only two strips 41, 42 for a 4-pole permanent magnet.

It could be seen / especially with an arrangement according to Pinur 3, also two set screws on the circumference of the housing 13 ν provided verden, whereby i-.nn also given the "possibility would be to influence the form of the reluctance torque accordingly.

- 5th

509821/0586

. - BAD ORIGINAL

Claims (1)

- MOTORS K3 - 5 - 16 »Part. 1973 St. Geoxgen ^: V ", ^ P ate η ta η s ρ r ü c Ii e 1. \ Kollektorlos-vr Equal: istrommotGr ^: a with a permanent ffif - .. Tivtriiiu, one arranged at the stator, ir: jJo rubbed a ".Lückeα • ■ uiweiüen -. '. Es, elektromagne ^ iuches An ■ uriebsuioment c-rzeti _c: enüen winding., furthermore with .at least one soft element extending in the stray field area on the inner or outer circumference of the Eotor
Save your energy during the duration of the electro-magnetic drive and to give it off
Energy in the gaps of this drive torque, according to patent application P 23 32 012.9 "(DT-T52), thereby
characterized ,, that the 'soft iron element (41, 42; 60) on a stationary part (13) of the engine
(10) is arranged so as to be adjustable, and. that an actuator (53, 54; 63) is provided for adjusting the distance between the soft iron element and the rotor circumference (47). DC motor according to claim 1, characterized in that dai3 the soft iron element (41, 42; 60) on the inside of the motor housing (13), which is preferably made of ferromagnetic material, is articulated. 3. DC motor according to claim 2, characterized in that that the ¥ eicheiüenelement (41, 42} 60) formed from sheet metal and with at least one end on the motor housing (13), preferably with rivets (43> 44; 61, .6.2), is attached o 4. DC motor according to at least one of the claims - 1 to 3, characterized in that a "flexible section (46) of the ", sliding iron element (41, 42) for articulation on the stationary part (13) of the motor (10) - serves, 509821/0586 BATH ORIGINAL - b - 16ο11.1973 5ο DC motor according to at least one of the claims 1 to 4, characterized in that the effective radial Distance between the rotor umiang (47) and the soft iron element (41, 42; 60) journals in the direction of rotation in one first angular range (alpha) quickly - una then in one second Winkel.-jereich (beta) long aBi v / i e α er decreases, 6ο DC motor after at least one or the preceding Claims, characterized in that at least one screw (53, 54j 63) is provided as the actuator isto 7. DC motor according to claim 6, characterized in that that the screw is guided in the motor housing (13). 8ο DC motor according to at least one of the preceding claims, characterized in that in the area of the Hotorumfr, n »;; s (47) several stationary articulated ¹ JeXCheisenelemente (41, 42) are provided, we ± eJä« n - g-ew- e-ii-s a soft iron element '.
at least Ue in actuator (53, 54; 63) is assigned. 509821/0586 BATH ORIGINAL