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1/22/2006 5:49 AM | |

Joined: 1/22/2006 Last visit: 10/8/2020 Posts: 73 Rating: (0) |
The speed on a conveyor is increased by increasing the AC drive frequency (F) to the motor. Torque (T) is affected by flux (Φ) and working current (IW). The drive will maintain constant flux by keeping the voltage and frequency ratio constant. To do this the drive increases voltage and frequency in proportion. During acceleration working current will increase, however, causing a corresponding increase in torque. Once at its new speed the working current and torque will be the same as its old speed. |

2/9/2006 11:24 PM | |

Posts: 271 Rating: (25) |
Greetings: Assuming that you're considering use of an AC servomotor the output torque is proportional to the drive current. What the first paragraph of your post is referring to the fact that when you are changing speed from one to another, the current of the drive will be such that to overcome the inertia of the driven load. Therefore, the motor current may need to increase during these periods of acceleration / deceleration. Once these periods are concluded, then the motor / drive current will go back to its previous value. Hope this helps... |

7/10/2006 9:37 AM | |

Posts: 18 Rating: (0) |
Hello Rajasekhar, Once the motor has reached higher speed, the voltage applied on the motor winding would also be higher. Hence power delivered to the motor will also be higher, keeping current constant, because power is the product of voltage and current. Hope I have been able to clarify your doubt. kris |

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