By Dorian Yannic. Car Wiring. Publised at Friday, January 12th 2018, 06:02:33 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 Cyrille Lothaire. Electrical Wiring. Published at Thursday, December 28th 2017, 10:45:09 AM. The fixture should support the board and prevent distortion as the board goes through the printing, component placement, and reflow processes. Its construction should ensure adequate protection for the bottom side components during the double-sided reflow process.
By Olivier Constance. Car Wiring. Published at Thursday, December 28th 2017, 10:09:08 AM. Ring terminal This alternative to the spadeterminal is used on heavier components. "Scotchlok" connector The "Scotchlok" connector splices two wires together, using asharp metal blade which pierces theinsulation. This is clamped using a pair ofpliers, and covered with a plastic clip.
By Gaspard Magalie. Motor Wiring. Published at Thursday, December 28th 2017, 10:08:52 AM. What is commonly referred to as microstepping is often sine–cosine microstepping in which the winding current approximates a sinusoidal AC waveform. Sine–cosine microstepping is the most common form, but other waveforms can be used. Regardless of the waveform used, as the microsteps become smaller, motor operation becomes more smooth, thereby greatly reducing resonance in any parts the motor may be connected to, as well as the motor itself. Resolution will be limited by the mechanical stiction, backlash, and other sources of error between the motor and the end device. Gear reducers may be used to increase resolution of positioning.
By Olivier Constance. Electrical Wiring. Published at Thursday, December 28th 2017, 07:48:26 AM. PCBs with SMT on both sides and those with mixed TH and SMTs may start to flex and bow when in the reflow oven or selective soldering machine. For this reason, the maximum size for this type of board is usually smaller than the single-sided. Breaking out the boards manually can stress the board and components near the edges, the solder joints, or leave out rough stubs on the edges
By Fleurette Nina. Motor Wiring. Published at Thursday, December 28th 2017, 05:54:53 AM. Identical model motors vary, so each needs to be calibrated by banging against some edge ... think of the banging noise when an inkjet printer is turned on. Servo motors are good for robot wheels that have to turn a certain distance then stop. They are good for robots that have to balance themselves somehow. Auto pilots can use these to navigate a hallway. They are not good for spinning propellers like brushed dc motors and brushless motors.
By Fleurette Nina. Electrical Wiring. Published at Thursday, December 28th 2017, 05:52:53 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. Electrical Wiring. Published at Thursday, December 28th 2017, 05:20:31 AM. Depanelization is the process of separating the individual boards from the main array and usually depends on the panelization method applied. The choice depends on the clearance to provide at the edges of the PCB, and the presence of sensitive SMT devices, or hanging connectors near the edges. There are automatic methods, such as the laser cutting or depaneling router, as well as manual methods that involve breaking the tabs using hands or other tools.
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