Table of Contents

- 1 What is the synchronous speed of a 6-pole motor?
- 2 What is the rotational speed of a three phase motor with 6 number of poles and frequency of 60 Hz?
- 3 How many coils does a 6 pole motor have?
- 4 What is synchronous speed when F 60hz P 6?
- 5 How is the RPM of a synchronous motor determined?
- 6 Can a induction motor reach its synchronous speed?

## What is the synchronous speed of a 6-pole motor?

Approximate Electrical Motor Speed (rpm) | ||
---|---|---|

No. Poles | Speed with Rated Load | Synchronous Speed (no Load) |

4 | 1725 | 1800 |

6 | 1140 | 1200 |

8 | 850 | 900 |

**What is the synchronous speed in RPM of a 4 pole 60 Hz synchronous motor?**

1800 revolutions per minute

Considering a 60 Hz power source, at what speed does a four-pole synchronous motor run? The correct answer is B, 1800 revolutions per minute (RPM).

**How do you find the frequency of a synchronous motor?**

The synchronous speed of an AC motor is determined by the frequency of the source and the number of poles. The RPM is calculated by multiplying the frequency times 60 and dividing by the number of pairs of poles.

### What is the rotational speed of a three phase motor with 6 number of poles and frequency of 60 Hz?

At 60 Hz, a motor with six poles would run at 1,200 RPM under no load and at approximately 1,175 RPM loaded. A motor with eight poles would run at 900 RPM unloaded and at about 800 RPM under load.

**How does frequency affect motor speed?**

A frequency higher than the rated frequency usually improves the power factor but decreases locked-rotor torque and increases the speed and friction and windage loss. At a frequency lower than the rated frequency, the speed is decreased, locked-rotor torque is increased, and power factor is decreased.

**What is the synchronous speed of a 6 pole motor supplied at 60 Hz?**

Using this equation, a 4-pole motor at 60Hz has a speed of 1,800 rpm, while a 6-pole motor at 50Hz has a speed of 1,000 rpm. However, this is actually the speed of the magnetic field, called the synchronous speed, which is not always equal to the shaft speed.

#### How many coils does a 6 pole motor have?

To create a six pole motor use six coils per phase that creates three north poles and three south poles and so on. The number of stator slots is always a multiple of six.

**What will be the synchronous speed of a 50 hertz 8 pole motor?**

Synchronous rotation speed at different frequencies and number of poles

Shaft rotation speed – n – (rev/min, rpm) | ||
---|---|---|

Frequency – f – (Hz) | Number of poles – p – | |

30 | 1800 | 600 |

40 | 2400 | 800 |

501) | 3000 | 1000 |

**What is the slip frequency of an induction motor?**

It is common to express the slip as the ratio between the shaft rotation speed and the synchronous magnetic field speed. When the rotor is not turning the slip is 100 %….Number of poles, frequencies and synchronous induction motor speed.

No. of Magnetic Poles | Frequency (Hz) | |
---|---|---|

50 | 60 | |

4 | 1500 | 1800 |

6 | 1000 | 1200 |

8 | 750 | 900 |

## What is synchronous speed when F 60hz P 6?

The synchronous speed of 60 Hz, 4 Pole Induction Motor is: 900 RPM. 1800 RPM.

**How does frequency affect speed?**

The data convincingly show that wave frequency does not affect wave speed. An increase in wave frequency caused a decrease in wavelength while the wave speed remained constant. Rather, the speed of the wave is dependent upon the properties of the medium such as the tension of the rope.

**What is synchronous motor speed?**

The synchronous speed is the speed of the revolution of the magnetic field in the stator winding of the motor. It is the speed at which the electromotive force is produced by the alternating machine. A machine that runs at synchronous speed is called a synchronous machine.

### How is the RPM of a synchronous motor determined?

The speed a synchronous motor will run can be determined by the number of poles of the motor and the frequency of the electrical service using the formula: RPM = Hz* (2 / poles) * 60. Frequency. Number Of Poles.

**How are rpm and Poles related in a motor?**

RPM = shaft rotation speed or revolutions per minute. Hz = frequency or cycles/sec. Poles = number of poles of your motor. So, for example, if you have a 4 pole motor on 60 Hz then RPM=60*(2/4)*60=1800 rpm. 60Hz is the most common frequency in the US. 50Hz is the most common frequency outside the US

**Which is the correct formula for synchronous speed?**

Slip = Synchronous Speed − Actual Speed Using the example above for synchronous speed of a motor with four poles operating at 60 hertz, the value was calculated to be 1800 RPM. The value most likely given for the RPM of the motor on the nameplate will be 1725 RPM. Using the formula for slip

#### Can a induction motor reach its synchronous speed?

Note – an induction motor will never reach its synchronous speed. If it did – the rotor would appear to be stationary to the rotating stator field since it would rotate with the same speed. With no relative motion between stator and rotor field no voltage will be induced in the motor.