A kind of rotor for linear stepping motor
Technical field
The utility model is related to a kind of rotor for linear stepping motor.
Background technology
At present, small linear stepper motor is because of its simple in construction, efficiency high, and the low advantage of production cost is automatic in office
Change and had broad application prospects in field, the automotive fields such as machine.In the rotor of small linear stepper motor, screw rod is used
7 and axle sleeve interference fit connection be one of which structure, as shown in figure 1, this cause screw rod 7 and axle sleeve to revolve with credit union simultaneously
Turn, during linear stepping motor is run, nut runs to the bottom of screw rod 7, nut often occur and the engagement of screw rod 7 is tightened
Power is excessive to cause torque to be more than Rated motor torque and screw rod 7 the problem of can not normally start, for this problem, screw rod 7 and axle
The structure of set interference fit connection is commonly designed new driver, loads overload current during electric motor starting in the circuit board so that
Motor obtains overload torque to overcome excessive screwing force, but there are problems that four:
1st, loading overload current can reduce the service life of circuit board.Still operating overload during normal operation after electric motor starting
Electric current, does not only exist the wasting of resources, and applying overload current for a long time to motor can cause heating temp too high, damage showing for motor
As.
2nd, cost is added using the driver especially write.
3rd, screw rod 7 is slender axles, easily flexural deformation, the high phenomenon of scrappage occurs during press-in axle sleeve.
The content of the invention
Technical problem to be solved in the utility model is that the defect for overcoming prior art is used for straight line stepping there is provided one kind
The rotor of motor, it can make rotary shaft obtain the torque more than nominal torque, overcome screwing force torque on startup, real
The good rotation of rotary shaft is showed.
In order to solve the above-mentioned technical problem, the technical solution of the utility model is:A kind of turning for linear stepping motor
Son, it includes:
Rotor body, the rotor body has main part and the supporting member in main part;
Rotary shaft, the rotation is pivotally supported on supporting member, and is had necessarily between rotary shaft and rotor body
Relatively rotate the free degree;
Connector, the connector is fixedly installed on the rotating shaft;
Elastic component, the elastic component is connected with the rotor body and connector respectively, when rotor body is rotated, institute
State rotor body drives the rotary shaft to rotate by elastic component and connector.
Further, the supporting member is axle sleeve, the axle sleeve and connector of the elastic component respectively with the rotor body
It is connected.
Further, the supporting member be sliding bearing and end cap, the elastic component respectively with the main part and company
Fitting is connected.
A kind of concrete structure of main part is further provided, the main part includes bushing and magnet ring, the magnetic
Ring is fixedly installed on the periphery wall of bushing.
Further not only to increasing the firmness between magnet ring and bushing, and it can make between magnet ring and bushing
It is smaller that gap is done, even close to gapless, improves the concentricity of magnet ring and bushing, and the magnet ring is bonded in the outer of bushing
Be provided with perisporium, and on the periphery wall of the bushing is at least used for the annular groove for storing bonding agent together.
A kind of concrete structure of elastic component is further provided, the elastic component is torque spring, the torque spring set
On the rotating shaft, and between the torque spring and the periphery wall of the rotary shaft there is certain gap.
Further for axis phenomenon and raising rotor rotation precision is avoided, the gap is 10~15 μm.
Further provide and be provided with spring end on the connected mode of a kind of connector and torque spring, the connector
The spring arm neck being connected with spring end storage tank, the one of the torque spring are provided with storage tank, and connector
End accommodation is in the spring end storage tank, and the head of the spring arm of the end of spring is caught in the spring arm card
In groove.
Further, diameter big 0~0.15mm of the width of the spring arm neck than spring arm.
The attachment structure of a kind of connector and rotary shaft is further provided, the connector and the rotary shaft are moulded in
Together.
Further, the connector is interference fitted on the periphery wall of rotary shaft.
Further, the end of the bushing is provided with stopper, the axial end portion of the connector and the axial direction of the stopper
End abutment is together.
Further, coordinate between axle sleeve and the periphery wall of the rotary shaft for gap;And/or the axle sleeve and the bushing
Between for interference fit;And/or between the connector and the periphery wall of the rotary shaft for interference fit.
Further, between the end cap and the periphery wall of the rotary shaft and/or the sliding bearing and the rotary shaft
Periphery wall between for gap coordinate.
Employ after above-mentioned technical proposal, the utility model has following beneficial effect:
1st, start without overload current, it is ensured that the normal service life of motor and circuit board.
2nd, the use of generic drive is that the startup of motor can be achieved, without separately writing driver, reduces cost.
3rd, while suitable for screwing force torque is excessive and the normal both of these case of torque.
4th, screw rod press-in axle sleeve deformation, the problem of scrappage is high are overcome.
Brief description of the drawings
Fig. 1 is the structural representation of the rotor of the prior art for linear stepping motor;
Fig. 2 is the sectional view of the rotor for linear stepping motor of the present embodiment one;
Fig. 3 is the assembling explosive view of the rotor for linear stepping motor of the present embodiment one;
Fig. 4 is the stereogram of the connector of the present embodiment one.
Fig. 5 is the structure sectional view of the rotor for linear stepping motor of the present embodiment two;
Fig. 6 is the stereogram of the rotor for linear stepping motor of the present embodiment two;
Fig. 7 is the stereogram of the connector of the present embodiment two.
Embodiment
In order that content of the present utility model is easier to be clearly understood, below according to specific embodiment and with reference to attached
Figure, is described in further detail to the utility model.
Embodiment one
As shown in figs. 2 to 4, a kind of rotor for linear stepping motor, it includes:
Rotor body, the rotor body has main part and the axle sleeve 101 in main part;
Rotary shaft, the rotation is pivotally supported on axle sleeve 101, and has certain phase between rotary shaft and rotor body
To rotational freedom;The rotary shaft is screw rod 7;
Connector 2, the connector 2 is fixedly installed on the rotating shaft;
Elastic component, the elastic component is connected with the axle sleeve 101 and connector 2 respectively, when rotor body is rotated, institute
State rotor body drives the rotary shaft to rotate by elastic component and connector 2.
As shown in Fig. 2 the main part includes bushing 3 and magnet ring 4, the magnet ring 4 is fixedly installed on the periphery of bushing 3
On wall.
As shown in Fig. 2 the magnet ring 4 is bonded on the periphery wall of bushing 3, and set on the periphery wall of the bushing 3
Have at least is used for the annular groove 31 for storing bonding agent together.The setting of annular groove 31 can not only increase between magnet ring 4 and bushing 3
Firmness, and can make that the gap between magnet ring 4 and bushing 3 does it is smaller, even close to gapless, improve magnetic
The concentricity of ring 4 and bushing 3.
As shown in Fig. 2 the elastic component be torque spring 5,5 sets of the torque spring on the rotating shaft, and it is described turn round
There is certain gap, the gap can be 10~15 μm, preferential 12 μ between power spring 5 and the periphery wall of the rotary shaft
M, less than 10 μm easy axis, more than 15 μm rotor rotation precision reductions, screw rod 7 will produce larger journey error, and rotor
There is larger vibration during startup.
It is provided with and bullet as shown in figure 4, being provided with the connector 2 on spring end storage tank 21, and connector 2
The spring arm neck 22 that spring end accommodation groove 21 is connected, the one end of the torque spring 5, which is placed in the spring end, to be held
Put in groove 21, and the head of the spring arm of the end of torque spring 5 is caught in the spring arm neck 22.
Diameter big 0~0.15mm of the width of the spring arm neck 22 than spring arm.Torque spring 5 is from elastic material
Material:Carbon structural steels, silicon-manganese spring steel, spring stainless steel etc., preferentially from carbon structural steels.Heat treatment:HRC42-48,
It is preferred that HRC45, the diameter of spring arm can use 0.5mm, a width of 0.5-0.65mm of spring arm neck 22, preferably 0.6mm,
If groove width is less than 0.5mm, spring arm can not be put into spring arm neck 22, and spring arm is easily separated from more than 0.65mm spring arms
Neck 22, can play in preferred interstice coverage and more preferably start effect.
Together with the connector 2 is molded with the rotary shaft.
As shown in Fig. 2 the end of the bushing 3 is provided with stopper 32, axial end portion and the stopper of the connector 2
32 axial end portion is abutted together.Stopper 32 is set to be able to prevent the axial float of rotary shaft on bushing 3.
Coordinate between the axle sleeve 101 and the periphery wall of the rotary shaft for gap;And/or the axle sleeve 101 with it is described
It is interference fit between bushing 3;And/or between the connector 2 and the periphery wall of the rotary shaft for interference fit.
The operation principle of the present embodiment one is as follows:
When screwing force torque between screw rod 7 and nut is more than the nominal torque of motor, motor is started with rated voltage, by
Coordinate between the axle sleeve on screw rod 7 and bushing 3 for gap, rotor body first rotates acquisition kinetic energy, drive 5 turns of torque spring
It is dynamic, by the inertia of rotor body, screw rod 7 is obtained the torque more than nominal torque, overcome screwing force torque, realize screw rod
7 rotation.
Embodiment two
As shown in Fig. 5~7, a kind of rotor for linear stepping motor, it includes:
Rotor body, the rotor body has main part and the sliding bearing 10202 in main part
With end cap 103;
Rotary shaft, the rotation is pivotally supported on sliding bearing 10202 and end cap 103, and rotary shaft and rotor body
Between have certain relative rotation free degree;The rotary shaft is screw rod 7;
Connector 2, the connector 2 is fixedly installed on the rotating shaft;Connector 2 in the present embodiment is injection molding body;
Elastic component, the elastic component is connected with the rotor body and connector 2 respectively, when rotor body is rotated,
The rotor body drives the rotary shaft to rotate by elastic component and connector 2.
As shown in Fig. 2 the main part includes bushing 3 and magnet ring 4, the magnet ring 4 is fixedly installed on the periphery of bushing 3
On wall.
As shown in Fig. 2 the magnet ring 4 is bonded on the periphery wall of bushing 3, and set on the periphery wall of the bushing 3
Have at least is used for the annular groove 31 for storing bonding agent together.
As shown in Fig. 2 the elastic component be torque spring 5,5 sets of the torque spring on the rotating shaft, and it is described turn round
There is certain gap, the gap can be 10~15 μm, preferential 12 μ between power spring 5 and the periphery wall of the rotary shaft
M, less than 10 μm easy axis, more than 15 μm rotor rotation precision reductions, screw rod 7 will produce larger journey error, and rotor
There is larger vibration during startup.
As shown in figure 4, be provided with the connector 2 on spring end storage tank 21, and connector 2 be provided with
The spring arm neck 22 that spring end storage tank 21 is connected, the one end of the torque spring 5 is placed in the spring end
In storage tank 21, and the head of the spring arm of the end of torque spring 5 is caught in the spring arm neck 22.
Diameter big 0~0.15mm of the width of the spring arm neck 22 than spring arm.Torque spring 5 is from elastic material
Material:Carbon structural steels, silicon-manganese spring steel, spring stainless steel etc., preferentially from carbon structural steels.Heat treatment:HRC42-48,
It is preferred that HRC45, the diameter of spring arm can use 0.5mm, a width of 0.5-0.65mm of spring arm neck 22, preferably 0.6mm,
If groove width is less than 0.5mm, spring arm can not be put into spring arm neck 22, and spring arm is easily separated from more than 0.65mm spring arms
Neck 22, can play in preferred interstice coverage and more preferably start effect.
The connector 2 is interference fitted on the periphery wall of rotary shaft.
Between the end cap 103 and the periphery wall of the rotary shaft and/or the sliding bearing 10202 and the rotary shaft
Periphery wall between for gap coordinate.
In addition, end cap 103 of the present utility model is demountable structure on bushing 3, end cap 103 can be torn open from bushing 3
Unload down, so as to change connector 2 and torque spring 5.
The operation principle of the present embodiment two is as follows:
When screwing force torque between screw rod 7 and nut is more than the nominal torque of motor, motor is started with rated voltage, by
Coordinate between the end cap 103 and sliding bearing 10202 on screw rod 7 and bushing 3 for gap, rotor body is first rotated and moved
Can, drive torque spring 5 to rotate, by the inertia of rotor body, screw rod 7 is obtained the torque more than nominal torque, overcome
Screwing force torque, realizes the rotation of screw rod 7.
Particular embodiments described above, enters to technical problem, technical scheme and the beneficial effect that the utility model is solved
Go further description, should be understood that and the foregoing is only specific embodiment of the utility model, and without
It is all within spirit of the present utility model and principle in limitation the utility model, any modification, equivalent substitution and improvements done
Deng should be included within protection domain of the present utility model.