| 关键标准 | 感应电动机 | 同步电动机 |
| 定义 | 感应或异步电动机是一种类型的权力是通过电磁感应，滑环和整流子，而不是提供转子滑环交流电机的交流电机。 | 同步电机是交流电机由一个线圈，磁铁电源频率相同的速度传递以及由此产生的旋转磁场，驱动转子旋转的区分。 |
| 同步转速 | 异步电机运行在低于??同步速度。 | 同步电机运行在同步转速。 |
| 磁场 | 转子磁场与转子旋转。 | 转子磁场与转子固定。 |
| 功率因数 | 异步电机必须始终与滞后的功率因数。 | 同步电机可以调整滞后，团结或的功率因数。 |
| 滑环 | 异步电机不滑环，但一些异步电动机软起动或速度控制。 | 同步电机的要求，滑环和电刷供应转子励磁。 |
(本文由网络直译过来如有不当之处请谅解.下列原文)
原文：
An induction or asynchronous motor is a type of AC motor where power is supplied to the rotor by means of electromagnetic induction rather than by slip rings and commutators as in slip-ring AC motors.
| Key Criteria | Induction Motor | Synchronous Motor |
| Definition | An induction or asynchronous motor is a type of AC motor where power is supplied to the rotor by means of electromagnetic induction rather than by slip rings and commutators as in slip-ring AC motors. | A synchronous electric motor is an AC motor distinguished by a rotor spinning with coils passing magnets at the same rate as the power supply frequency and resulting rotating magnetic field which drives it. |
| Synchronous Speed | Induction motors operate at less than synchronous speed | Synchronous motors operate at synchronous speed. |
| Magnetic Field | Rotor magnetic field rotates with respect to the rotor. | Rotor magnetic field is stationary with respect to the rotor. |
| Power Factor | Induction motors must always operate with a lagging power factor. | Synchronous motor can be adjusted to be lagging unity or leading power factor. |
| Slip Rings | Induction motors don&t require slip rings but some induction motors have them for soft starting or speed control. | Synchronous motors require slip rings and brushes to supply rotor excitation. |
