电动机功率（hp）与电流

概述

本页面提供了标准电压下交流感应电机典型满载电流（安培）的直接查找表。该数据对于导体、过流保护装置和配电盘的初步选型最有用。

保留原始来源上下文："Engineering ToolBox — 工程技术应用的设计与工程资源、工具和基础信息！"来源表标题为"电动机 — 马力、电压、效率和安培"，列出了 115 VAC 和 230 VAC 电机在 50% 和 70% 效率下的安培额定值。

关键公式

电机的机械功率输出与电输入电流之间的基本关系为：

$I = \frac{P_{hp} \times 745.7}{V \times \eta \times PF}$

此公式考虑了电机效率和功率因数的实际因素，它们决定了产生给定马力输出所需的电流。

变量

参考数据

下表显示了常见电机尺寸的典型满载安培额定值。数值假定标准鼠笼式感应电机，适用于连续工作制。实际电流可能因制造商和具体电机设计而异。

Motor Current Calculator

Use the calculator below to estimate full-load current for a motor not listed in the table, or to verify calculations. This uses the formula above.

单位换算器

还原的原始源表

以下表格还原自原始来源页面，以保留完整的参考数据。

Electrical Motors - Horsepower, Voltage, Efficiency and Amps

Interactive Motor Current Chart

The original motor-current image and source table are represented below as plottable full-load current curves by horsepower, voltage, and efficiency.

原始源图

以下原始来源图像予以保留，以免丢失视觉参考资料。当图像包含图表或表格数据时，其提取值已呈现在页面的表格、计算器或交互式图表中；其余图像保留为视觉来源参考。

工程要点

• Power Factor Significance: An electric motor is an inductive load. A low power factor means the motor draws significant current to produce useful work, increasing apparent power (kVA) demand on the supply.
• Starting Current: The table lists full-load (running) current. Motor starting (inrush) current can be 6 to 8 times higher, which is critical for selecting protective devices like circuit breakers and fuses.
• Voltage Effects: Current draw is inversely proportional to voltage. A lower-than-rated voltage will cause higher current draw for the same horsepower, potentially leading to overheating.
• Motor Nameplate: Always consult the manufacturer's nameplate on the motor for its specific rated current, efficiency, and power factor. The table provides typical values for planning purposes only.
• Three-Phase Motors: This table is for single-phase motors. The formula for three-phase motors is $I = (P_{hp} \times 745.7) / (\sqrt{3} \times V \times \eta \times PF)$.

参考资料

• Original Source: Engineering ToolBox - Electrical Motor HP and Amps