An auxiliary positioning torque design method based on the configuration of the welding groove of the motor yoke
A technology of positioning torque and design method, applied in electromechanical devices, design optimization/simulation, manufacturing of motor generators, etc., can solve problems such as difficult development, and achieve good portability and versatility.
Active Publication Date: 2022-07-22
NANJING UNIV OF SCI & TECH
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Problems solved by technology
[0003] In the actual application of servo motors, it is often necessary to adjust the precise position of the load end in the event of a power failure. Usually, it is necessary to cooperate with relevant measuring instruments to achieve a certain accuracy of position calibration. This operation is difficult to carry out in places such as narrow spaces.
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[0038] Example: Taking a permanent magnet synchronous motor servo system with 36 slots / 4 pairs of poles and a reduction ratio of 60 as an example, two solutions are required, providing 2-mil (0.12 degrees) and 3-mil (0.18 degrees) respectively. Auxiliary positioning force:
[0039] Step 1. Calculate the number of cogging torque zero points required by the motor side in the servo system as required, such as figure 2 shown;
[0040] When the load accuracy requirement is 2 mils (0.12 degrees), and the servo motor can provide a cogging torque balance point every 2 mils, then N zero = 50, take 48;
[0041] When the load accuracy requirement is 3 mils (0.18 degrees), and the servo motor can provide a cogging torque balance point every 3 mils, then N zero = 33, take 32.
[0042] Step 2: Determine and calculate the number of welding slots based on the number of motor slot bases according to the required number of cogging torque zero points. The calculation method is as follow...
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The invention discloses an auxiliary positioning torque design method based on the configuration of the welding groove of the motor yoke. For the permanent magnet motor, the cogging torque is constructed through the partial saturation design of the magnetic circuit, and the basic structure, configuration and size of the motor are not changed. Combined with the speed ratio of the reducer, the number and position of the zero points of the cogging torque of the motor are constructed, and combined with the angle subdivision effect of the speed ratio of the reducer, an accurate and clear auxiliary positioning indexing point is provided on the load side. The invention is applied to the permanent magnet servo motor. The motor helps the operator to adjust the position of the load mechanism by hand in the event of a power failure.
Description
technical field [0001] The invention belongs to the technical field of electric motors, in particular to an auxiliary positioning torque design method based on the configuration of a welding groove of a yoke of a motor. Background technique [0002] Cogging torque is a periodic torque that is unique to permanent magnet motors and can also be generated in the event of power loss. Academically, how to suppress cogging torque to reduce torque ripple; how to construct cogging torque There is little academic discussion of torque, but in practical applications, cogging torque with appropriate period and amplitude, combined with the speed ratio of the reducer, can form a weak positioning force on the load side to assist manual positioning operations. [0003] In the actual application of servo motors, it is often necessary to adjust the precise position of the load end in the event of a power failure. Usually, it is necessary to cooperate with relevant measuring instruments to achi...
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IPC IPC(8): H02K15/00G06F30/17G06F30/23
CPCH02K15/00G06F30/17G06F30/23
Inventor 孙乐刘肖强丁一平甘辉
Owner NANJING UNIV OF SCI & TECH