﻿ 高效直驱推进电机设计方法

# 高效直驱推进电机设计方法Design Method of High Efficiency Direct Drive Motor

Abstract: According to the characteristics of the propulsion, the external load characteristics of the high efficiency motor are analyzed, and the overall design of the propulsion motor is carried out with efficiency as the starting point. From the angle of iron loss, copper loss and harmonic loss, the optimization design of the motor is carried out to reduce the electromagnetic loss, and from the angle of bearing friction loss and rotor friction loss, the optimal design of motor loss reduction is carried out.

1. 引言

2. 负载特性分析

vp为螺旋桨的进速，单位为m/s；

vs为船舶的速度，单位为m/s；

ω为伴流系数；

D为螺旋桨直径，单位为m；

P为螺旋桨的推力，单位为N；

M为螺旋桨的转矩，单位为N∙m；

ρ为海水的密度，单位为kg/m3，通常取1025 kg/m3

$T\propto {n}^{2}$ (3)

n为电机转矩，单位为r/min。

${P}_{M}=Tn/9.55$ (4)

${P}_{M}\propto {n}^{3}\propto {T}^{2}$ (5)

3. 总体设计

200 kW级高效直驱推进电机的设计输入指标要求如表2所示。

Figure 1. Relation diagram of motor characteristics of mechanical and load

Table 1. Comparison between high efficiency direct drive motor and traditional propulsion plant

Table 2. Index requirements

Table 3. Index requirements

Figure 2. Three dimensional electromagnetic simulation diagram of motor

4. 高效优化设计

1) 低电磁损耗优化设计

Figure 3. Magnetization curve of 50W290

Figure 4. Span diagram of motor winding

Table 4. Copper loss comparison of two kinds of motor when the speed is 60 rpm

2) 低机械损耗优化设计

5. 小结

Table 5. Comparison of harmonic loss of pole and non oblique pole motor

Figure 5. Magnetic density distribution diagram of motor

Figure 6. Sliding bearing

Figure 7. Diagram of rotor structure

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