Efficient power supply three-phase motor

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Uploaded: 11.02.2010
Content: 21227.rar (1328,01 kB)

Description

This device is intended for supply of three-phase asynchronous motors, standard commercially available from a source of low voltage 12V or lighting network ~ 220V. In contrast to all such devices, the circuit ispoluzuet rekurperatsiyu energy back EMF of the motor windings that allows several times to reduce the current consumption of the engine, especially at idle. For example, a 0.6 kW motor 1350 rev / min idling at rated speed consumes only 4.5A from a source or 12V 300 mA from the network ~ 220V. Such consumption can not be achieved when all the existing methods of powering these engines. The device generates three phase full to ensure normal rotation of the motor, which allows to smoothly adjust the motor speed in a wide range. When the device is powered from the mains, using the voltage multiplier, the power of the engine becomes close to the nominal. With further increase of the power supply voltage will increase proportionally. In fact, the maximum power of the engine depends on the parameters of power circuit elements (SCRs and phase capacitors) and takkzhe, the dielectric strength of the insulation of the motor windings, the ability of the winding to withstand the powerful current pulses, the mechanical strength of the motor housing. With the improvement scheme (the replacement of parts in the main circuit at a high) can be removed from the engine capacity is several times greater than allow his passport characteristics. Capacity can be increased up until the winding is melted at the points of connection or not detonate the motor housing. As already mentioned, in this case, of course, increase the current consumption. However, the application of the scheme makes it easy to increase the efficiency of the engine from 0.6 to 0.9, which can be important for energy-saving projects (primechaenie: low power efficiency of up to 3 kW induction motor can not be more than 70%, more powerful engines with more poles have an efficiency of about 90 %).

Additional information

A characteristic feature of the scheme is a complete lack of motor and heating elements of the scheme. Motor windings zapityvatsya short and powerful pulses of high current through the coil is not constant current. This prevents windings become active load, which eliminates their heating. Also, with the engine greeetsya (respectively burnout) in case of jamming of the rotor.

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