By Charlotte Myriam. Motor. Publised at Friday, January 05th 2018, 22:53:04 PM. The choice of a power supply is determined by voltage, current, and power supply type (i.e. switching versus linear, regulated versus unregulated, etc.). By far the most problematic and complicated factor is voltage, which will be discussed last.
By Alix Loane. Motor. Publised at Saturday, January 06th 2018, 07:22:36 AM. Motor output doubles when the power supply voltage is doubled for either series or parallel-wired motors. Notice that a parallel-connected motor delivers performance identical to a series-connected motor running at twice the power supply voltage.
By Alix Loane. Diagram. Published at Saturday, January 06th 2018, 18:33:29 PM. On all but the simplest PCBs, wires must be printed on more than one surface of fiberglass to allow for all the required component interconnections. Each surface containing printed wires is called a layer. In a relatively simple PCB that requires only two layers, only one piece of fiberglass is required since wires can be printed on both sides. In a more complex PCB where several layers are required, individual circuit boards are manufactured separately and then laminated together to form one multi-layer circuit board. To connect wires on two or more layers, small holes called vias are drilled through the wires and fiberglass board at the point where the wires on the different layers cross. The interior surface of these holes is coated with metal so that electric current can flow through the vias. Most Digilent boards are simple four or six layer boards; some more complex computer circuit boards have more than 20 layers.
By Jessica Mireille. Car Wiring. Published at Saturday, January 06th 2018, 18:20:29 PM. The electrical system of a car is a closed circuit with an independent power source the battery. It operates on a small fraction of the power of a household circuit. Current flows along a single cable from the battery to the component being powered, and back to the battery through the cars metal body. The body is connected to the earth terminal of the battery by a thick cable.
By Valentine Sybille. Diagram. Published at Saturday, January 06th 2018, 17:30:41 PM. Knowing how to read circuits is a very useful skill that will help you out all the time. especially if you start messing around with building little electronics projects.
By Alix Loane. Diagram. Published at Saturday, January 06th 2018, 15:25:58 PM. A capacitor is a two-terminal device that can store electric energy in the form of charged particles. You can think of a capacitor as a reservoir of charge that takes time to fill or empty. The voltage across a capacitor is proportional to the amount of charge it is storing – the more charge added to a capacitor of a given size, the larger the voltage across the capacitor. It is not possible to instantaneously move charge to or from a capacitor, so it is not possible to instantaneously change the voltage across a capacitor. It is this property that makes capacitors useful on Digilent boards and in many other applications.
By Jessica Mireille. Motor. Published at Saturday, January 06th 2018, 12:30:19 PM. The drive remedies this instability by adding a second-order, or viscous, damping. This damping decreases the total phase lag so the motor cannot sustain oscillation, much in the same way shock absorbers damp the mass-spring suspension of a vehicle.
By Alix Loane. Motor. Published at Saturday, January 06th 2018, 07:22:36 AM. 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 Charlotte Myriam. Motor. Published at Friday, January 05th 2018, 22:53:04 PM. What can be seen is there is not increase of the power output; the motor simply reaches its maximum power at a lower speed, all at the great expense of a four-fold increase in motor heating.
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