By Charlotte Myriam. Motor. Publised at Monday, January 01st 2018, 06:19:04 AM. The effect of uncompensated mid-band resonance. Though it is possible to accelerate through the resonant region, it is not possible to operate the motor continuously in the speed band without mid-band resonance compensation. This is because the oscillation that causes the motor to stall takes from half a second to 10 seconds to build to amplitude sufficient to stall the motor.
By Alix Loane. Motor. Publised at Wednesday, January 03rd 2018, 11:13:57 AM. Electrically, a real motor differs from an ideal one primarily by having a non-zero winding resistance. Also, the iron in the motor is subject to magnetic saturation, as well as having eddy current and hysteresis losses. Magnetic saturation sets a limit on current to torque proportionally while eddy current and hysteresis (iron losses) along with winding resistance (copper losses) cause motor heating.
By Cyrielle Marjolaine. Motor. Publised at Tuesday, January 02nd 2018, 04:22:51 AM. To prevent this, the drive must be set to limit the motor current to its rated value. Because torque is proportional to current, motor torque is constant from zero speed to the corner speed. Above the corner speed, motor current is limited by the motor’s inductive reactance.
By Alix Loane. Circuit. Published at Friday, February 09th 2018, 08:51:28 AM. Most electronic circuits can be represented as a system with an input and an output. The input signal is typically a voltage that is generated by a sensor or by another circuit. The output signal is also
By Alix Loane. Motor. Published at Friday, February 09th 2018, 07:11:13 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 Friday, February 09th 2018, 05:54:45 AM. A real step motor has losses that modify the ideal speed-torque curve. The most important effect is the contribution of detent torque. Detent torque is usually specified in the motor datasheet. It is always a loss when the motor is turning and the power consumed to overcome it is proportional to speed. In other words, the faster the motor turns the greater the detent torque contributes power loss at the motor’s output shaft. This power loss is proportional to speed and must be subtracted from the ideal, flat output power curve past the corner speed. This now constitutes a practical speed-torque curve.
By Sasha Sara. Car Wiring. Published at Friday, February 09th 2018, 01:15:05 AM. The same is true of the ignition wire and the coil wire. These should not be closer than 1 inch. Many teams will tie-wrap these two wires together, which is a very bad idea. The pulse from the coil wire is very strong and interferes with the ignition signal.
By Sasha Sara. Car Wiring. Published at Friday, February 09th 2018, 00:03:30 AM. 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 Alix Loane. Motor. Published at Monday, January 29th 2018, 23:13:59 PM. 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 Madeleine Catherine. Motor. Published at Monday, January 29th 2018, 18:05:09 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.
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