机械臂用电动螺杆直驱永磁同步电机设计与分析

doi:10.11985/2018.08.006

摘要/Abstract

摘要：

液压驱动存在传动效率低、漏油和高温易引发火灾的问题。本文采用永磁同步电动机螺杆直驱取代机械臂用液压驱动环节,将一台挖掘机动臂油缸参数转化为P_N= 22kW、n_N= 750r/min的永磁同步电动机参数,分别设计6极36槽和8极48槽电机,同时在Maxwell中进行空载仿真。通过采用转子不均匀气隙对电机气隙磁密波形和齿槽转矩进行优化,并进行负载仿真,得到了一台可用于取代机械臂液压缸的永磁同步电动机。

关键词: 液压驱动, 永磁同步电动机, 螺杆直驱, 转矩优化

Abstract:

In this paper, the hydraulic drive system is replaced by the direct drive of the permanent magnet synchronous motor with the screw which connected to the rotor, because of the low transmission efficiency, oil spills and most likely a fire when working in high temperature environment.The parameters of an excavator boom cylinder are converted to the parameters as P_N= 22kW、n_N= 750r/min of the permanent magnet synchronous motor. The 6-pole 36-slot and 8-pole 48-slot motor are designed respectively, the no-load simulations is done in Maxwell at the same time. Air gap magnetic flux and cogging torque are optimized by the way of the use of the uneven air gap, the load simulations is achieved, and a permanent magnet synchronous motor that can be used to replace a hydraulic cylinder is also achieved.

Key words: Hydraulic drive, permanent magnet synchronous motor, screw drive, torque optimization

中图分类号:

TM351

杨君子,冯桂宏,张炳义. 机械臂用电动螺杆直驱永磁同步电机设计与分析[J]. 电气工程学报, 2018, 13(8): 32-36.

Yang Junzi,Feng Guihong,Zhang Bingyi. Design and Analysis of Permanent Magnet Synchronous Motor With Electric Screw for Arm[J]. Journal of Electrical Engineering, 2018, 13(8): 32-36.

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参考文献 10

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名称	参数
活塞杆直径/mm	65
缸桶直径/mm	115
最大工作行程/mm	900
工作油路压力/MPa	26
活塞工作速度/(m/s)	0.25
动臂提升时间/s	3.3
动臂工作时间/s	6.5

应用场合	寿命/h
普通机械	5 000~10 000
普通机床	10 000~20 000
数控机床	20 000

极槽配合	6极36槽	8极48槽
定子外径/mm	310	310
定子内径/mm	195	205
铁心长度/mm	215	230
气隙长度/mm	0.8	0.8
永磁体长度/mm	84	64
永磁体宽度/mm	7	6
空载反电动势/V	203.3	203.5
热负荷/[A²/(cm·mm²)]	1 003.13	934.68
额定转矩/N·m	278.35	280.51

电流角/(°)	6极36槽电机转矩/N	8极48槽电机转矩/N
20	287.25	286.54
22.5	287.59	286.01
25	287.36	284.88
27.5	286.26	283.10
30	284.51	280.68