CN2904447Y - Brushless DC motor having stator iron core with Hall element groove - Google Patents

Abstract

The utility model relates to a brushless DC motor of a stator core with a hall tablet groovy. The existing brushless DC motor of the hall component is convenient for installing the hall tablet with an over long axial direction. In order to solve the technology problems, the utility model comprises a stator, a rotor, a front a back cover and a bearing motor noumenon, a hall position sensor (hall tablet for short) and a printed circuit board acting as an electronic commutation switch, characterize in that: the stator-slice is provided with a special profile for placing the hall tablet which is directed arranged in the hall profile of the stator core, and the pin of the hall tablet connected on the printed circuit board. Thus, the hall tablet of the utility model can be directly connected in the hall groove, without prolonging the length of the motor axial direction or adjusting the position of the sensor improving the precision of the position distribution and the whole operation performance. The utility model has the advantages of simple construction and easy manufacture, mainly used for the speed-variable motor and control motor.

Description

Stator core has the brushless DC motor of Hall film trap

Technical field

The utility model relates to a kind of brushless DC motor, and particularly a kind of stator core has the brushless DC motor of Hall film trap.

Background technology

Modern age, brushless DC motor generally adopted switch Hall element (abbreviation Hall plate) to make position transducer, and three phase electric machine is with three Hall plates.The conventional method of placing Hall plate has two kinds.A kind of be allow rotor permanent magnet grow stator core some, Hall plate is placed on the permanent magnet outer surface space that correspondence grows, and directly detects the signal that the p-m rotor Surface field changes; Another kind is to install an auxiliary permanent magnet magnetic ring identical with the rotor permanent magnet number of poles on the rotor additional, and Hall plate is placed on the space surface of assisting magnet ring, can obtain the square wave hall signal of identical number of poles.Hall plate determines that along circumferential position two kinds of methods are also arranged.A kind of is that to make circumferential locations adjustable, definite through debugging when motor dispatches from the factory; Another kind is to determine promptly with stator phase winding axis definite relative position relation is arranged when installing, if with auxiliary magnet ring, also requires it consistent with the rotor permanent magnet poles position or fixing relativeness arranged.The axial length of motor is big, needs to adjust sensing station, and is very inconvenient!

The utility model content

The technical problems to be solved in the utility model is the above-mentioned defective that how to overcome prior art, provides a kind of stator core that the brushless DC motor of Hall film trap is arranged.

Stator punching has the brushless DC motor of Hall film trap to adopt following scheme to realize: the same with the motor of standard, this motor also is made of parts such as stator, rotor, front and rear cover and bearings, the Hall element that it is characterized in that this brushless DC motor is placed in the Hall film trap specific in the stator core, flute profile on the stator iron-core lamination has two kinds, a kind of is the standard flute profile, it is special-shaped that another kind is generally three grooves, its notch was placed the position of slot wedge originally, was designed to the size that is complementary with Hall plate profile commonly used.

The pin of Hall element is welded on the printed circuit board, and output signal directly or is after treatment drawn.Printed circuit board (PCB) is placed on the stator winding end outside, in rear end cap, and the effect that the stator coil end of can having held concurrently when needing connects.

Hall element is drawn signal, and strict phase relation requirement is arranged.At first be the signal of three Hall elements 120 ° of electrical degrees that should stagger mutually, when three Hall film traps in the space when 120 ° of space angles, the number of pole-pairs that will require motor is not 3 multiple, and one of characteristics of this explanation this patent motor are that number of pole-pairs is not 3 multiple.

Secondly strict phase relation requirement is arranged between the signal of Hall element and the corresponding phase winding counter potential waveform.Under 120 ° of conduction mode drive conditions of square wave, require 30 ° of electrical degrees of the corresponding phase electromotive force of Hall element signal lag.That is to say (the back-emf instantaneous value is zero) when the center line of phase winding is consistent with a certain pole center line of rotor that the center line of a corresponding Hall element should be apart from a certain interpolar center line ± 30 ° of electrical degrees.This just has certain restriction to the relation of number of stator slots and rotor number of poles, and the relational expression below available represents,

When 1, the phase winding center line is on a certain tooth center line,

$N_s=\frac{12n+6}{6m+3\±1}\·p---\left(1\right)$

When 2, the phase winding center line is on a certain groove center line,

$N_s=\frac{12n}{6m+3\±1}\·p---\left(2\right)$

Wherein: N _s---number of stator slots;

P---rotor pole logarithm;

N---any positive integer;

M---another any positive integer.

After adopting technique scheme, Hall plate of the present utility model can directly be put into the Hall film trap of stator core, does not increase the motor axial length, does not need to adjust sensing station, has improved the position distribution precision and the overall operation performance of transducer.Has advantage simple in structure, easily manufactured, mainly as buncher, control motor.

Description of drawings

Fig. 1. this stator core has the structural representation of the brushless DC motor of Hall film trap;

Fig. 2. (a) the stator punching figure of Hall film trap is arranged;

Fig. 2. (b) standard flute profile schematic diagram;

Fig. 2. (c) the special-shaped groove schematic diagram of band Hall film trap;

Fig. 3. the phase diagram of phase winding back-emf and the corresponding signal of Hall element mutually;

Fig. 4. (a) Hall element position and phase winding position of center line concern schematic diagram (I);

Fig. 4. (b) Hall element position and phase winding position of center line concern schematic diagram (II);

Fig. 5 .8 utmost point 9 groove motor windings winding diagrams;

Fig. 6. groove electromotive force star and phase potential phasor figure;

Fig. 7. the relativeness figure of motor phase electromotive force and hall signal.

Among the figure, 1 is that fore bearing, 2 is that front end housing, 3 is that stator, 4 is that rotor, 5 is that rear end cap, 6 is that rear bearing, 7 is that Hall element, 8 is a printed circuit board.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

Shown in Fig. 1 to 7, most of structure of the present utility model is consistent with standard motor, and slightly different part is: Hall plate 7, be placed in stator 3 core slots, and pin stretches out outside the core end groove, is welded on the printed circuit board 8.

This example is the permanent magnet motor of 4 pairs of utmost points, and p=4 gets n=1 and m=1, can get by formula (1)

$N_s=\frac{12+6}{6+3-1}\·4=9$

Be the motor that stator has 9 grooves, stator punching is shown in Fig. 1 (a).Clearly illustrate that among the figure that the 1st, the 4th and the 7th groove is special-shaped groove, there is the flute profile of placing Hall plate at its notch place.Certain common on its size and market Hall element size is corresponding.The 120 ° of mechanical angles that stagger mutually between three Hall plate groove center lines, under the situation of p=4,120 ° * 4=480 ° electrical degree, just 120 ° of electrical degrees promptly stagger mutually.Meet the requirement that three road hall signals stagger 120 ° of electrical degrees mutually.

The connection of this example stator winding as shown in Figure 5, the 1st, the 2nd with the 3rd tooth on coil be connected into U mutually; Similarly the 4th, the 5th with the 6th tooth on coil be unified into V mutually; 7th, the 8th with the 9th tooth on coil be unified into W mutually.U, V and W phase winding are connected into Y shape.The slot-pitch angle of 8 utmost points, 9 groove motors is 40 ° of mechanical angles, equals 160 ° of electrical degrees, so the groove electromotive force star of this example motor and phase potential phasor are as shown in Figure 6, obvious U phase winding center line on the center line of the 2nd tooth, with the center line of the 2nd groove apart Angular pitch, because n=1, should be consistent with the center line of this corresponding Hall element with the center line of the 1st groove, promptly the 1st groove should be the special-shaped groove of Hall film trap, as shown in Figure 5.The winding of this sample example motor promptly meets three symmetrical principles, also meets the driving requirement of 120 ° of conductings of square wave with the relation of hall signal.

If when the driving of 180 ° of conductings or sine wave drive, require hall signal and corresponding back-emf same-phase.As long as three phase windings are connect from Y make △ into and connect, then △ connects the equivalent Y shape winding of winding, and the back-emf of its equivalent phase winding connects the corresponding back-emf mutually of winding with former △ and just in time moves past 30 ° of electrical degrees, as shown in Figure 7.Meet sine wave drive or 180 ° of requirements that conducting drives.

Claims (4)

1, a kind of stator core has the brushless DC motor of Hall film trap, comprise the motor body, the hall position sensor that contain stator, rotor, front and rear cover and bearing---be called for short Hall plate and the printed circuit board that serves as the electronic commutation switch, it is characterized in that: have the specific flute profile of placing Hall plate on the stator punching, Hall plate directly is placed in the Hall film trap of stator core, and the pin of Hall plate is linked on the described printed circuit board.

2, stator core according to claim 1 has the brushless DC motor of Hall film trap, it is characterized in that: three Hall plates are arranged on the stator, and 120 ° of electrical degrees mutually stagger.

1. or expression 2. 3, stator core according to claim 1 has the brushless DC motor of Hall film trap, it is characterized in that: the rotor number of poles is not 3 multiple, and meets following relational expression between number of stator slots and rotor number of poles:

1., the phase winding center line is on a certain tooth center line the time,

$N_s=\frac{12n+6}{6m+3\±1}\·p...\left(1\right)$

2., the phase winding center line is on a certain groove center line the time,

$N_s=\frac{12n}{6m+3\±1}\·p...\left(2\right)$

Wherein: N _s---number of stator slots;

P---rotor pole logarithm;

N---any positive integer;

M---another any positive integer.

4, stator core according to claim 1 has the brushless DC motor of Hall film trap, it is characterized in that: when taking 120 ° of conduction modes of square wave to drive, three-phase stator winding Y connects; When taking 180 ° of conduction modes of square wave or sine wave drive, the three-phase stator winding Δ connects.

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