CN202424337U - Rotor sheet and rotor for permanent-magnet motor - Google Patents

Abstract

The utility model discloses a rotor sheet and a rotor for a permanent-magnet motor. An edge of the rotor sheet along one side of the rotor sheet, which is close to a rotation shaft, is provided with a plurality of permanent-magnet slots which are used for containing permanent magnets and are provided with openings on one side of the rotation shaft. One side of the rotor sheet, which is far away from the rotation shaft, is circumferentially provided with a plurality of copper bar slots which are used for containing starting copper bars and formed along the radial direction of the rotor sheet in the length direction. The copper bar slots comprise first copper bar slots which are opposite to and butted with the permanent-magnet slots, and second copper bar slots which are not opposite to the permanent-magnet slots, wherein the second copper bar slots are longer than the first copper bar slots. The rotor comprises a rotor core and a plurality of starting cage bars which are positioned in the rotor core, wherein the rotor core is formed by overlapping a plurality of rotor sheets. The asynchronous starting torque of the motor is improved by adjusting the area ratio of the first and second copper bar slots and adjusting (increasing) the resistance value of the rotor.

Description

The rotor punching and the rotor that are used for permanent magnet motor

Technical field

The utility model belongs to the motor technology field, particularly relates to a kind of rotor punching and rotor that is used for permanent magnet motor, and the rotor core of said rotor adopts said rotor punching to be formed by stacking.

Background technology

Equipment centering high-power high voltage excellent start performance in the commercial production has certain requirement, and the starting torque multiple of common high-voltage three-phase asynchronous motor is low excessively, often less than 1.0 times, has satisfied not the needs in the actual production.When using normal asynchronous, have to increase the equipment power of motor, cause equipment when operation, motor do not move in the economic limit at technological energetic efficiency characteristic.Advantages such as the utility model permanent magnet synchronous motor has energy-efficient, and starting performance is good are widely used by industrial and mining enterprises.

Permanent magnet synchronous motor is owing to the asymmetry that permanent magnet and friendship, d-axis magnetic circuit are housed on rotor; Make its electromagnetic states in starting process very complicated; Except that containing the asynchronous starting torque, also contain permanent magnet and have the dynamic brake torque that causes in the starting process average torque.The starting average torque can adopt following mathematical relationship to represent:

$T_c=\frac{\mathrm{mp}{U}^2{R_2}^{\&prime;}/s}{2\mathrm{\&pi;f}[{({\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="HDA0000118214930000011.png"\; state="\{\{state\}\}">R</figure-callout>}}_1+c_1{R}_2^{\&prime;}/s)}^2+{({\mathrm{<figure-callout\; id="1"\; label="X"\; filenames="HDA0000118214930000011.png"\; state="\{\{state\}\}">X</figure-callout>}}_1+c_1{X}_2^{\&prime;})}^2]}$

C in the formula ₁-owing to the correction factor that adopts induction motor Γ shape approximate equivalent circuit to introduce,

${\mathrm{<figure-callout\; id="1"\; label="c"\; filenames="HDA0000118214930000011.png"\; state="\{\{state\}\}">c</figure-callout>}}_1=1+\frac{X_1}{X_m}$

R ' ₂-rotor resistance reduced value (Ω)

X ' ₂-rotor leakage reactance reduced value (Ω)

Visible by above formula, starting torque T _cBe and rotor resistance reduced value R ' ₂Be directly proportional, also promptly with rotor resistance R ₂Be directly proportional.This shows that the resistance value that increases rotor can improve the asynchronous starting torque, and then improve the starting average torque of permanent magnet motor.

The rotor of permanent magnet motor comprises rotor core and is located at the starting cage in the rotor core that the starting cage comprises a plurality of starting cage bars, starts the cage bar and is generally copper bar.Offer a plurality of copper bar grooves that are used for ccontaining starting cage bar that are parallel to rotating shaft in the rotor core, in the copper bar groove, be placed with the starting copper bar then, a plurality of starting copper bars connect into the starting cage.Wherein, Rotor core comprises the identical a plurality of rotor punchings of shape that are superimposed with each other; The shape of the rotor punching 1 of prior art is as shown in Figure 1; Every rotor punching 1 is provided with a plurality of permanent magnet trough 13 that are used for ccontaining permanent magnet, and permanent magnet trough 13 is an opening for the side towards rotating shaft, and rotor punching 1 is provided with a plurality of copper bar grooves that are used for ccontaining starting copper bar away from a side of rotating shaft along its circumference.The shortcoming of prior art is; The size of copper bar groove is identical; The first copper bar groove 11 relative with permanent magnet trough 13 is owing to be located at the restriction of its inboard permanent magnet trough 13, and size is less, the second copper bar groove 12 at other positions and the identical size of the first copper bar groove, 11 maintenances; Influence the overall dimensions of starting copper bar placed within, and then influence rotor resistance value R ₂Adjusting, finally influence raising and other torque performances regulation and control of asynchronous starting torque.

The utility model content

To the above-mentioned defective that prior art exists, the problem that the utility model will solve is, improves the rotor resistance of permanent magnet motor and the asynchronous starting torque of permanent magnet motor, finally improves the starting average torque of permanent magnet motor.

For addressing the above problem; The utility model provides a kind of rotor punching that is used for permanent magnet motor; Be provided with a plurality of permanent magnet trough that are used to hold permanent magnet along said rotor punching near the edge of rotating shaft one side towards a side opening of said rotating shaft; Said rotor punching is provided with a plurality of copper bar grooves that radially are provided with that are used for a plurality of length directions of ccontaining starting copper bar along said rotor punching away from said rotating shaft one side along its circumference; Said copper bar groove comprises the first copper bar groove that is oppositely arranged and docks with said permanent magnet trough and second not relative with the said permanent magnet trough copper bar groove, and the length of the said second copper bar groove is greater than the length of the said first copper bar groove.

As preferably, the cross section of said copper bar groove is a rectangle.

The utility model also provides a kind of rotor that is used for permanent magnet motor, comprises rotor core and is positioned at a plurality of starting cage bars of said rotor core, and said rotor core comprises a plurality of aforesaid rotor punching that is superimposed together.

As preferably, the different material of said a plurality of starting cage strip adoptions.

Further, as preferably, said starting cage bar adopts brass and red copper at interval.

Compared with prior art, the beneficial effect of the utility model has: through regulating the size of two kinds of different copper bar grooves, increase the resistance value of rotor, improve the asynchronous starting torque of motor.

Description of drawings

Fig. 1 is the structural representation of the rotor punching of prior art;

Fig. 2 is the structural representation of rotor punching of an embodiment of the utility model.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail, but not as the qualification to the utility model.

As shown in Figure 2; The rotor punching that is used for permanent magnet motor 2 of the embodiment of the utility model; Be provided with a plurality of permanent magnet trough 23 that are used to hold permanent magnet along said rotor punching 2 near the edge of rotating shaft (not shown) one side towards a side opening of said rotating shaft; Rotor punching 2 is provided with a plurality of a plurality of copper bar grooves that are used for ccontaining starting copper bar away from said rotating shaft one side along its circumference; The length direction of copper bar groove is along the radially setting of said rotor punching 2; As shown in Figure 2, said copper bar groove comprises the length of the length of the first copper bar groove 21 that is oppositely arranged and docks with permanent magnet trough 23 and not relative with the permanent magnet trough 23 second copper bar groove, 22, the second copper bar grooves 22 greater than the first copper bar groove 21.In the present embodiment, the first copper bar groove 21 docks with permanent magnet trough 23, and under the certain situation of permanent magnet trough 23, the length of the first copper bar groove 21 obtains maximum.The utility model is through the length of second not relative with the permanent magnet trough copper bar groove 22 of increase, thus the resistance value of regulating the length ratio adjusting rotor of the first copper bar groove, 21 length and the second copper bar groove 22, the asynchronous starting torque that improves motor.As shown in Figure 2, as preferably, in the present embodiment, the cross section of the first copper bar groove 21 and the second copper bar groove 22 is rectangle, and the copper bar groove of rectangle can utilize kelvin effect further to increase the resistance value of rotor.Certainly, the first copper bar groove 21 and the second copper bar groove 22 can also adopt ellipse to wait other shapes.In addition, the quantity of the first copper bar groove 21 that is oppositely arranged with permanent magnet trough 23 can be one or two, even more a plurality of.

The utility model also provides a kind of rotor that is used for permanent magnet motor; Comprise rotor core and be positioned at a plurality of starting cage bars of said rotor core; Different with prior art is that said rotor core comprises a plurality of aforesaid rotor punching 2 that is superimposed together, a plurality of rotor punching 2 superimposed pillared rotor cores; Can starting cage bar be set along its copper bar groove, form the starting cage.Wherein, a plurality of starting cage bars can adopt identical material, like whole employing brass and red copper; Different materials be can also adopt,, promptly brass and red copper are respectively according to adjacent copper bar groove as adopting brass or red copper at interval.If starting cage bar all adopts red copper; The starting torque multiple can reach 1.5-2.0; If adopting red copper and brass places at interval; Starting torque multiple even can reach 2.5 makes motor keep under High Power Factor, the high efficiency situation starting more rapidly and stable, has strengthened the ability of pulling in of motor simultaneously.Certainly, what those skilled in the art should know is that the resistance value of rotor bar will increase in allowed limits, otherwise does not reach the effect that improves starting torque.

Certainly; The above is the preferred implementation of the utility model; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; Can also make some improvement and retouching, these improvement and retouching also are regarded as the protection range of the utility model.

Claims (5)

1. rotor punching that is used for permanent magnet motor; Be provided with a plurality of permanent magnet trough that are used to hold permanent magnet along said rotor punching near the edge of rotating shaft one side towards a side opening of said rotating shaft; Said rotor punching is provided with a plurality of copper bar grooves that radially are provided with that are used for a plurality of length directions of ccontaining starting copper bar along said rotor punching away from said rotating shaft one side along its circumference; It is characterized in that; Said copper bar groove comprises the first copper bar groove that is oppositely arranged and docks with said permanent magnet trough and second not relative with the said permanent magnet trough copper bar groove, and the length of the said second copper bar groove is greater than the length of the said first copper bar groove.

2. the rotor punching that is used for permanent magnet motor as claimed in claim 1 is characterized in that, the cross section of said copper bar groove is a rectangle.

3. rotor that is used for permanent magnet motor comprises rotor core and is positioned at a plurality of starting cage bars of said rotor core, it is characterized in that said rotor core comprises a plurality of rotor punchings according to claim 1 or claim 2 that are superimposed together.

4. 3 the rotor that is used for permanent magnet motor as claimed in claim is characterized in that the different material of said a plurality of starting cage strip adoptions.

5. 4 the rotor that is used for permanent magnet motor as claimed in claim is characterized in that said starting cage bar adopts brass and red copper at interval.

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