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Electric spindle based on gullet-free motor

An electro-spindle, no cogging technology, applied in the direction of electromechanical devices, electrical components, electric components, etc., can solve the problems of increasing the mechanical loss and temperature rise of the motor, increasing the overall weight of the motor, and increasing the vibration of the electro-spindle, and reducing the speed of the spindle. Vibration, reduction of overall weight and moment of inertia, reduction of machining errors

Inactive Publication Date: 2021-10-19
BEIJING JINGDIAO GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing motorized spindles adopt a slotted motor structure, and the stator tooth structure is made of laminated silicon steel sheets. During operation, the main magnetic flux will generate hysteresis loss in the stator core teeth and yoke. And eddy current loss, increase the mechanical loss and temperature rise of the motor, and also increase the overall weight of the motor
In addition, due to the high cogging torque of the cogging motor, large torque fluctuations may easily lead to increased vibration of the electric spindle and affect machining accuracy.

Method used

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  • Electric spindle based on gullet-free motor
  • Electric spindle based on gullet-free motor
  • Electric spindle based on gullet-free motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] combine Figure 1 to Figure 3 As shown, an electric spindle based on a slotless motor of the present invention includes a stator 1 , a rotor 2 , a main shaft 3 , a sleeve 4 and a bearing 5 . Stator 1 , rotor 2 , and main shaft 3 are arranged coaxially inside sleeve 4 in sequence from outside to inside, and main shaft 3 is supported by bearing 5 and can rotate under the interaction of stator 1 and rotor 2 .

[0027] The stator 1 comprises a stator yoke 11, a stator winding 12 and a yoke insulating layer 13, the inner surface of the stator yoke 11 is provided with a yoke insulating layer 13, the stator winding 13 is installed on the inside of the stator yoke 11, and is connected with the yoke The insulating layer 13 is bonded together. The stator yoke is made of magnetically permeable or non-magnetically permeable material. When it is made of magnetically conductive material, it constitutes a non-cogging rotating machine, and when it is made of non-magnetically conducti...

Embodiment 2

[0033] The structure of this embodiment is basically the same as that of Embodiment 1, the difference is that the stator 1 of this embodiment does not include a stator yoke 11, but only consists of stator windings 12, such as Figure 9 As shown, the stator winding 12 is directly installed on the inner side of the sleeve 4. In order to ensure insulation, a sleeve insulating layer 41 is arranged on the inner surface of the sleeve 4. After the stator winding 12 is installed on the inner side of the sleeve 4, it is connected with the sleeve insulating layer 41 phase fit, in order to further increase the insulation and rigidity, it can also be potted with heat-conducting and insulating curing glue. The sleeve 4 is provided with an external cooling channel 42, which can cool the main shaft as a whole after passing through the cooling liquid.

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Abstract

The invention relates to an electric spindle based on a gullet-free motor. The electric spindle comprises a sleeve, a spindle body, a bearing, a stator and a rotor, the stator, the rotor and the spindle body are sequentially and coaxially arranged in the sleeve from outside to inside, and the spindle body is supported through the bearing and can rotate under the interaction of the stator and the rotor; the stator comprises a stator winding, the stator winding is of a cylindrical ring structure enclosed by a plurality of coils, and the coils are uniformly distributed along the circumferential direction of the cylindrical ring; and each coil comprises one or more coil units which are connected in series, and the coil units are distributed in an aligned and laminated mode along the radial center of the cylindrical ring and are insulated from one another in the laminated direction. The electric spindle has the advantages of low loss, low heat, high torque constant linearity, low vibration and high processing precision, and can meet the processing requirements of high speed and high precision.

Description

technical field [0001] The invention belongs to the field of numerical control machining, in particular to an electric spindle based on a slotless motor. Background technique [0002] The electric spindle is a structure that combines the spindle and the spindle motor into one, which is applied to the CNC machine tool. The electric spindle has the advantages of compact structure, light weight, small inertia, low noise, fast response, etc. It can simplify the design of the machine tool and facilitate the positioning of the spindle. It is an ideal structure in the high-speed spindle unit. The electric spindle used on high-precision machine tools not only requires high spindle speed, but also requires high rotation accuracy, small vibration, and small thermal elongation. Therefore, the spindle motor is required to have the characteristics of low loss and small torque fluctuation. However, most of the existing motorized spindles adopt a slotted motor structure, and the stator to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K3/04H02K3/28H02K3/34H02K3/46H02K3/47H02K3/24H02K9/19H02K3/02
CPCH02K3/04H02K3/28H02K3/34H02K3/345H02K3/46H02K3/47H02K3/24H02K9/19H02K3/02H02K2203/03
Inventor 郝凌霄付江寒吴立英黄晓雷徐润
Owner BEIJING JINGDIAO GRP CO LTD
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