By Cyrille Lothaire. Car Wiring. Publised at Saturday, December 30th 2017, 02:17:52 AM. Starter motors fail mostly due to overheating. They are placed in a hostile, hot environment and cannot be expected to last indefinitely. Another mode of failure is a shorted or open winding. This exhibits itself as a "dead spot" on the commutator. If a brush lands on a dead spot the motor wont turn at all. A third failure-mode is a faulty pinion engagement. Sometimes the pinion assembly gets stiff or stuck due to lack of lubrication or wear. Starter motor rebuilding or replacement is required for all of these problems.
By Gaspard Magalie. Electrical Wiring. Published at Tuesday, September 26th 2017, 17:22:48 PM. This PCB, like almost all of my PCBs, is a four-layer board. In my opinion, it is not wise to restrict yourself to two layers unless you’re dealing with a very simple circuit or you really need to cut costs. The four-layer arrangement is beneficial in terms of routing and performance: routing, because via connections to internal planes almost completely eliminate power and ground traces; and performance, because the internal planes allow for low-resistance, low-inductance power and ground connections. The extra top-layer and bottom-layer real estate opened up by all the internal-plane connections come in very handy when you need to provide a generous copper area for improved thermal performance (for example, to make sure that your LDO or your motor driver doesn’t overheat and enter thermal shutdown).
By Cyrille Lothaire. Electrical Wiring. Published at Sunday, September 24th 2017, 00:10:58 AM. V-groove panelization involves cutting a third of the board’s thickness from the top and bottom sides. The remaining part joins the separate boards and is then cut with a machine during the depaneling. This helps to reduce the stress on the PCB. One challenge with the V-groove method is that it is restrictive and cannot be used with PCBs that have overhanging components over the edges.
By Adrienne Emmanuel. Motor Wiring. Published at Saturday, September 23rd 2017, 20:20:29 PM. 2 wires. Servomechanisms are designed to move to a spot and hold it is position. They are not designed to spin continuously. Used to position print heads in ink jet printers, plotters, scanners. Travel at set speeds. Go to a spot and stop. When stopped and still turned on, will attempt to hold it is position. Forcing it to move in this position can damage the motor. Typically is controlled by a circuit board that counts shadows with an LED and light sensor or has a resistor that changes value depending upon position. Often zooms to one side when powered on to figure out where it is at.
By Fleurette Nina. Motor Wiring. Published at Thursday, September 21st 2017, 18:43:05 PM. Stepper motor performance is strongly dependent on the driver circuit. Torque curves may be extended to greater speeds if the stator poles can be reversed more quickly, the limiting factor being a combination of the winding inductance. To overcome the inductance and switch the windings quickly, one must increase the drive voltage. This leads further to the necessity of limiting the current that these high voltages may otherwise induce.
By Cyrille Lothaire. Electrical Wiring. Published at Sunday, September 17th 2017, 03:23:46 AM. The fixtures are usually available in a variety of designs, materials, sizes, and thicknesses. Some can carry more than one board hence allowing the processing of multiple PCBs simultaneously. Other designs have adjustments to support both the primary and secondary side processes.
By France Barbara. Electrical Wiring. Published at Saturday, September 16th 2017, 00:10:12 AM. In a demanding application, we may not have the time to continuously check the pointers to see if they have reached the end of the buffer and wrap them back to the beginning of the buffer when necessary. As a result, a DSP processor uses dedicated hardware to provide some fast circular buffers.This hardware implementation automatically checks the status of the pointers and updates them accordingly.
By Mailys Laurent. Motor Wiring. Published at Thursday, September 14th 2017, 20:19:13 PM. Fixed speed motors have a cable that contains power, inputs (motor on, motor half speed) and an output pulse related to the motors motion. Variable speed motors typically have no circuitry directly associated with the motor. Instead there are typically three wires coming out that attach to an "Electronic Speed Controller."
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