General Drives Questions Frequently Asked Questions
General Drives Questions Frequently Asked Questions
| Question | Can I run my application at extremely low speeds? |
| Answer | Three major problems exist with both conventional methods of motor control and VFD control. (1) When a motor is directly coupled and run at low speed it becomes very inefficient. One could go with a high torque motor that is significantly larger than the standard (including higher cost), and would have the same results most of the time. (2) Typical motors do not cool themselves well at extremely low speed. The added heat buildup in the windings can cause premature motor failure. Check with the motor manufacturer for more details. (3) The other issue is load inertia, which is larger than that of the motor. These effects increase greatly with a transmission system that is sloppy. A speed reducer or gearbox should be employed to solve this problem. It will match the inertial changes and increase the efficiency. Speak with your local distributor about sizing the gearbox to meet you application needs. |
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This item was last updated on 09-25-2007
Document ID: 775
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