---
title: 直流电机技术参数说明 - 欧拉利
description: 直流电机技术参数说明：额定电压、空载转速、堵转扭矩、额定功率与效率，教你读懂电机规格书，EURARI技术指南。
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介绍电机与齿轮箱产品组合技术信息③，直流电机技术参数的说明

- 以下数值都是在标称电压及外部环境温度25℃ 条件下测量或计算
 
### 1、技术用语

 | 用 语 | 符 号 | 单位 | 用 语 | 符 号 | 单位 |
|---|---|---|---|---|---|

 | 电压 | U | V | 输入功率 | P | W |
|---|---|---|---|---|---|
| 电流 | I | A | 输出功率 | P | W |
| 无负荷电流 | I0 | A | 最高输出功率 | Pmax | W |
| 堵转电流 | Is | A | 效率 | η | % |
| 转数 | N | r/m,rpm | 最高效率 | ηmax | % |
| 无负荷转数 | N0 | r/m,rpm | 转矩 | T | g.cm,mN.m |
| 电阻 | R | Ω | 堵转转矩 | Ts | g.cm,mN.m |

### 2、空载电流--I0

电机在额定电压下，空载达到稳定状态时所消耗的电流，此参数受温度影响。

### 3、空载转速--N0

电机在额定电压下，空载达到稳定状态时获得的最高转速。

### 4、堵转力矩--Ts

电机在额定电压下，转速为零时输出的力矩，此参数与温度密切相关。1. 基本关系: Ts​=Kt​⋅Is​。2. 堵转电流: Is​=U/R。3. 考虑摩擦的预测模型: Ts​=Kt​×(U/R−i0​)

![](https://eurari.com/images/support/2509/DC-Motor-technical-parameter-description-article-1.png)

### 5、起动电流(Stall current)--Is

在额定电压下，起动时和加锁时流过的最大电流。

![](https://eurari.com/images/support/2509/DC-Motor-technical-parameter-description-article-2.png)

### 6、最大输出功率--Pmax

电机在额定电压下，能输出的最大机械功率。

### 7、最大输出效率--ηmax

电机输出的机械功率与消耗的电功率的最高比率。

### 8、反电动势常数--KE(mV/rpm)

此常数反映了转子的感应电压和旋转速度之间的关系。  
![](https://eurari.com/images/support/2509/DC-Motor-technical-parameter-description-article-3.png)

### 9、转矩常数--Kt (g.cm/A)

此常数反映了电机产生的转矩和电流消耗之间的关系。在国际单位制(SI)中，转矩常数 Kt​ (N⋅m/A) 与反电动势常数 Ke​ (V/(rad/s)) 在数值上相等。

### 10、速度常数--Kn (rpm/V)

当电机负载恒定时，加在电机上每伏电压引起的速度变化。

![](https://eurari.com/images/support/2509/DC-Motor-technical-parameter-description-article-4.png)

### 11、机械时间常数--tm （ms）

电机从静止状态加速到最终空载转速的63%所需要的时间

![](https://eurari.com/images/support/2509/DC-Motor-technical-parameter-description-article-5.png), 其中 R: 静态电阻, J: 转子惯量

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