Published at Tuesday, January 02nd 2018, 15:16:45 PM by *Bertille Solange*. Motor

Inductance (L) has a property called inductive reactance, which for the purposes of this discussion may be thought of as a resistance proportional to frequency and therefore motor speed. According to Ohm’s law, current is equal to voltage divided by resistance. In this case we substitute inductive reactance for resistance in Ohm’s law and conclude motor current is the inverse of motor speed. Since torque is proportional to ampere-turns (current times the number of turns of wire in the winding), and current is the inverse of speed, torque also has to be the inverse of speed. In an ideal step motor, as speed approaches zero, its torque would approach infinity while at infinite speed torque would be zero. Because current is proportional to torque, motor current would be infinite at zero as well.

There is a special consideration if the power supply will be at or near the maximum voltage rating of the drive. If the motor will be rapidly decelerating a large inertial load from a high speed, care has to be taken to absorb the returned energy. The energy stored in the momentum of the load must be removed during deceleration and be safely dissipated. Because of its efficiency, the drive has no means of dissipating this energy so it returns it to the power supply. In effect, instead of drawing current from the power supply, the drive becomes a source of current itself. This current may charge the power supply capacitor to destructive voltage levels.

73 out of 100based on 772 user ratings

Recent post

- Ih 284 Tractor Wiring Diagram
- John Deere Model 50 Engine Diagram
- Dodge Dart Steering Column Wiring
- Honda Odyssey Transmission Wiring Diagrams
- Jeep Cj Wiring Diagram For Starter
- John Deere 2120 Wiring Diagram
- John Deere L118 Wiring Schematics
- Diagram Rover Engine Discovery 2013
- Light Fixture Dimmer Wire Diagram
- John Deere Model A Engine Diagram

Category

Monthly Archives

Static Page

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z - 0 1 2 3 4 5 6 7 8 9

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z - 0 1 2 3 4 5 6 7 8 9

Altrushare - Wiring Diagram Gallery

Copyright © 2003 - 2018 Domain Media. All sponsored products, company names, brand names, trademarks and logos arethe property of their respective owners.