By Cyrielle Marjolaine. Motor. Publised at Thursday, June 29th 2017, 01:05:11 AM. 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.
By Lydie Honorine. Motor. Published at Friday, December 29th 2017, 17:00:56 PM. The drive is a current source in the constant torque region and adds no additional phase lag. In the constant power region however, the drive is a voltage source so it introduces an additional 90 degree phase lag. The total phase lag now is 180 degrees, which is a setup for a sustained and building motor oscillation. This oscillation is commonly called mid-band instability or mid-band resonance.
By Alix Loane. Car Wiring. Published at Friday, December 29th 2017, 16:59:56 PM. Now that you have a good idea of how you want to wire your car, the routes, the connections, and the switches and gauges, think about duplicating the wiring just in case you need it.
By Bertille Solange. Car Wiring. Published at Friday, December 29th 2017, 14:22:05 PM. When fitting extra accessories, such as a rear window heater which consumes a heavy current, always wire it through the ignition switch. Some ancillary components can be operated without the ignition turned on by turning the switch to the "auxiliary" position. A radio is usually wired through this switch, so that it can be played with the engine off.
By Bertille Solange. Motor. Published at Friday, December 29th 2017, 13:36:08 PM. When using multiple drives from a common power supply, use individual supply and ground wires to each drive and return them to a common point back at the power supply. This is called a “star” power supply distribution; never use a “daisy-chain” power distribution, where the supply and ground wires for the next drives are picked up from the previous one.
By Lydie Honorine. Car Wiring. Published at Friday, December 29th 2017, 11:17:46 AM. Electricity flows from a battery in one direction only, and some components work only if the flow through them is in the correct direction. This acceptance of a one-way flow is called polarity. On most cars the negative () battery terminal is earthed and the positive (+) one feeds the electrical system.
By Madeleine Catherine. Car Wiring. Published at Friday, December 29th 2017, 07:00:27 AM. This type of circuit is called an earth-return system any part of it connected to the car body is said to be earthed. If the battery voltage drops, less current flows, and eventually there is not enough to make the components work.
By Lydie Honorine. Car Wiring. Published at Friday, December 29th 2017, 06:24:32 AM. I cannot tell you how many teams have connected these wires thinking purple must go with purple. It does not. Note the location of each wire on both sides of the original connectors and identify them with markings before you cut off the old connector.
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