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. Car Wiring. Published at Saturday, December 30th 2017, 01:33:56 AM. Modern cars often need room for many wires in confined spaces. Some manufacturers now use printed circuits instead of bundles of wires, particularly at the rear of the instrument panel. Printed circuits are plastic sheets on which copper tracks have been "printed". Components are plugged directly into the tracks. A few modern cars have flexible printed circuits. The copper tracks are printed in ribbons of flexible plastic, which replace the whole wiring system.
By Alix Loane. Motor. Published at Saturday, December 30th 2017, 00:13:39 AM. A step motor is highly resonant because it is a mass-spring system. The “mass” portion is the rotor and load inertia while the “spring” portion is the restoring torque of the magnetic field that drags the rotor along. Because of this, velocity lags torque by 90 degrees.
By Alix Loane. Motor. Published at Friday, December 29th 2017, 20:40:03 PM. The voltage of your power supply is entirely dependent on the inductance rating of your motor, which we learned is translatable to the number of turns of wire in the stator. Every motor model will have a different inductance rating and will therefore have a different maximum voltage. To figure out what the maximum power supply voltage should be, use the following formula with the motor’s inductance in millihenries (mH) used for the L value.
By Madeleine Catherine. Car Wiring. Published at Friday, December 29th 2017, 19:35:53 PM. Apart from the main charging, starting and ignition circuits, there are other circuits that power lights, electric motors, the sensors and gauges of electrical instruments, heating elements, magnetically operated locks, the radio and so on. All Circuits are opened and closed either by switches or by relays - remote switches operated by electromagnets.
By Lydie Honorine. Motor. Published at Friday, December 29th 2017, 17:00:56 PM. It is recommended the motor current always be set at the rated value also to get the best microstep smoothness. Setting the current higher degrades the linearity of the motor and causes microstep bunching and attendant low-speed vibration.
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. If your terminal is attached by a nut to a post, use lock washers and if it is a very important connection, and most are, use blue Loctite on the post. Many electrical failures are random and due to loose connections that are hard to trace. A quick look and the connection looks good, but if it is loose, it will cause an interruption of the current flow periodically.
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