By Jessica Mireille. Motor. Publised at Thursday, December 21st 2017, 11:37:52 AM. Typically, the motor will be a 6-lead or 9-lead motor. Motors with six leads are nearly always single-voltage motors. Such motors might be dual-winding motors, in which case you can wire them for a part winding start. You can connect them for a delta start or a wye start.
By Charlotte Myriam. Motor. Publised at Monday, December 18th 2017, 14:50:43 PM. If more than one drive is being operated from the power supply this is not a problem since the other drive(s) will absorb this current for its needs, unless it is decelerating as well. For this case or for a single drive it may be necessary to place a voltage clamp across the power supply in the form of a Zener diode. The voltage of this diode must be greater than the maximum expected power supply voltage, yet low enough to protect the drive. A good choice would be either 82 volts or 91 volts as standard values.
By Bertille Solange. Diagram. Published at Monday, January 01st 2018, 12:43:12 PM. The slide switches are also known as “single throw-double pole” (STDP) switches, because only one switch (or throw) exists, but two positions (or poles) are available (a pole is an electrical contact to which the switch can make contact). These switches can be set to output either Vdd (when the actuator is closest to the board’s edge) or GND. The push button switches are also known as “momentary” contact buttons, because they only make contact while they are actively being pressed – they output a GND at rest, and a Vdd only when they are being pressed. The figure below shows typically pushbutton and slide switch circuits used on Digilent boards.
By Valentine Sybille. Diagram. Published at Monday, January 01st 2018, 11:51:03 AM. A block diagram shows a higher level (or organizational layout) of functional units in a circuit (or a device, machine, or collection of these). It is meant to show data flow or organization between separate units of function. A block diagram gives you an overview of the interconnected nature of circuit assemblies or components.
By Charlotte Myriam. Motor. Published at Monday, January 01st 2018, 09:21:29 AM. The result now is a two-part speed-torque curve which features constant torque from zero speed until it intersects the motor’s natural load line, called the corner speed, beyond which the motor is in the constant power region.
By Cyrielle Marjolaine. Diagram. Published at Monday, January 01st 2018, 08:30:28 AM. A first look at a circuit diagram may be confusing, but if you can read a subway map, you can read schematics. The purpose is the same: getting from point A to point B. Literally, a circuit is the path that allows electricity to flow. If you know what to look for, it’ll become second nature. While at first you’ll just be reading them, eventually you will start creating your own. This guide will show you a few of the common symbols that you are sure to see in your future electrical engineering career.
By Charlotte Myriam. Motor. Published at Monday, January 01st 2018, 06:19:04 AM. Ideally, you will be connecting motors per an installation drawing. In that case, it’s a matter of correctly identifying the motor leads by number and connecting them per the drawing. Don’t try to “wing it” when replacing a motor, working with OEM equipment, or installing a motor when such drawings have been provided. But there’s a catch. We’ll get to that in a moment.
By Madeleine Catherine. Motor. Published at Monday, January 01st 2018, 06:16:35 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 Bertille Solange. Motor. Published at Monday, January 01st 2018, 05:05:03 AM. Eddy current and hysteresis heating are collectively called iron losses. The former induces currents in the iron of the motor while the latter is caused by the re-alignment of the magnetic domains in the iron. You can think of this as “friction heating” as the magnetic dipoles in the iron switch back and forth. Either way, both cause the bulk heating of the motor. Iron losses are a function of AC current and therefore the power supply voltage.
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