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Rotary Phase Converter
The rotary phase converter consists of a motor, which has three windings inside it. Two of the windings, act as a motor and the third winding acts as a generator. The need for a generator is to generate a balanced power in the machine circuit. The motor generator is also used for phase conversions (AC to DC or DC to AC), ‘DC’ stands for direct current and ‘AC’ stands for alternating current. The rotary phase converter has a shaft near the input voltage source, to detect the variations in the voltage, so as to prevent the machine from damage due to high voltage. A three phase motor and large number of capacitors constitute a single, small device which looks like a big capacitor, in the rotary phase converter. The three terminals of the motor are connected to the output of the rotary phase converter. The motor used in the device has the capacity to withstand a higher HP than the output power expected.

Digital Phase Converter
Digital phase converter is a recent technology that uses microprocessor programming to control the solid state devices used in the phase converter. The input rectifier (device that converts AC to DC) of the digital phase converter consists of an IGBT (Insulated Gate Bipolar Transistors), which is connected in series with an inductor. The process of conversion to three phase power, in this device is called as double IGBT conversion, as the main component used is IGBT, which is a fast switching semiconductor device operating at 10,000 Hz. In the conversion process, the AC power is converted to DC and then back to AC by IGBT. IGBT does not directly produce an AC signal. It produces a PWM (Pulse Width Modulation Wave), which is passed through the capacitor or an inductor, because it is a fact that, capacitors block DC and allow only AC. Digital Signal Processor (DSP) is the microprocessor used in the device, which continuously monitors the input voltage to produce a balanced three phase power. If the input voltage is considerably high, the DSP switches out, to prevent the damage of the phase converter due to high voltage.

Variable Frequency Drive
In this device, the frequency or speed of the AC induction motor is controlled by the variable frequency drive (VFD). The VFD sends a modulating signal to the AC motor, thereby controlling its speed. Variable frequency drive is also known as variable speed drives, as it controls the speed of the AC motor. This device is commonly used in fans, pumps, etc., for efficient power consumption, smooth start-up and to save electricity. Ramping is an important factor in the functioning of the motor. The VFD sets the ramp up time, reference time and ramp down time of the motor, to reduce the mechanical wear of the device using VFD. Ramping is very important because sudden acceleration from the switch on time to the operating speed or sudden decline from the operating speed to the device off time, will cause damage to the VFD operating devices. So, to avoid this, ramping is necessary.

There are several choices of iPod speakers available in the market that you can pick from, and it all depends on what features you are looking for and what your budget is like. You can find a cheap iPod speaker that only works with your specific iPod model and that will cost you around $50. Or you can find a multi-device speaker with great features and accessories that will sell for as much as $500. With that in mind, here are some of the best portable iPod speakers around.

Altec Lansing Mix iMT800 – $199
Altec Lansing is a very popular brand in the speaker industry, and even though the designing and physical appearance of this speaker may not appeal to everyone, its utility definitely will. You get a remote control, 2 auxiliary ports for connecting other devices, easy portability since the speaker runs on batteries as well and it has an FM radio too. The disadvantage is that the speaker is a little expensive compared to similar speakers, but this is only because Altec Lansing guarantees nothing but the best sound quality and performance. The Altec Lansing Octiv Duo M202 for $85, the Altec Lansing InMotion Compact iMT320 for $49 and the Altec Lansing Octiv Mini M102 for $39 are also worth considering.

Bose SoundDock 10 – $549
If you’re wondering why this iPod speaker costs so much, it’s simply because of the sound quality that it is capable of producing. The singular speaker is not designed very aesthetically, in fact it is rather plain looking, but the sound that it produces is enough to fill a large room with considerable ease. You also have a video output/line input, a Bluetooth dock for private listening but no FM radio. For this price though, a lot more is expected from an iPod speaker, so be prepared to shell out mega bucks for this speaker simply for the glamor factor. The Bose SoundDock Portable system for $350 is a better option, since it is smaller and slightly more economical as well.

Logitech S715i – $115
If you are looking for the best iPod speaker that represents great value for money, then this is just the right option for you. With plenty of favorable iPod speaker reviews from all sources, this is definitely the speaker of choice for many people out there. Logitech typically produces immense quality, and the 8 sound drivers in this speaker make it an exceptional purchase for that price. There are not many advanced features on this speaker, but this is a compromise that most people are happy to make. The remote control makes it more user friendly, and it is hard to imagine anyone overlooking this particular iPod speaker. If you are looking for something a bit smaller, the Logitech S315i for $65 would also be a good option. read more »

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