Simple electrical calculator helps to calculate the horsepower for dc (direct current) motor. Dont expect full power at lower V, however. AC motors can be equipped to do this, but must be specified accordingly. Although you can theoretically make one of these yourself, buying a pre-made converter is a much simpler solution. DC Motor As a Generator: The DC motor is a ready made generator that will generate electricity. Large motor-generator sets were widely used to convert industrial amounts of power while smaller units were used to convert battery power (6, 12 or 24 V DC) to a high DC voltage, which was required to operate vacuum tube (thermionic valve) equipment. Why Register your drives for ServicePlan? The evolution of AC variable speed drive technology has been partly driven by the desire to emulate the performance of the DC drive, such as fast torque response and speed accuracy, while utilising the advantages offered by the standard AC motor. We'll assume you're ok with this, but you can opt-out if you wish. No use of any material covered by this copyright may be used in whole or in part without the express written consent of Hallam-ICS. Dan has an extensive background in drive systems and control, including coordinated systems of continuous processes. I have a single phase 3.5 hp AC motor that I want to convert to a 12 Volt for a project. So, an inverter circuit is employed for converting the DC to AC converter. The cost of your whole project is covered by the ECA Scheme, Material Installation and commissioning. Pair that with a … Conversion of DC drive to AC drive is complex. Why you may want to consider change? A power inverter, or inverter, is a power electronic device or circuitry that changes direct current (DC) to alternating current (AC). Chris Giusto is Director of Industrial Projects and works primarily with industrial facilities to improve processes & safety, reduce waste & energy consumption, increase flexibility & capacity, and build new facilities. As a result, the older AC drives that simply regulated the Volts/Hz ratio had difficulty controlling torque at low speeds. Here everything is same like AC system but the electricity delivered directly to the battery after converting into DC. DC motors are simple to control and provided accurate and fast torque control along with high dynamic speed response. While an in-depth discussion of this topic is not the goal here, it is worth mentioning that maintenance requirements for DC motors is a common reason that facilities choose to change to AC motors. AC technology is more efficient than DC and through greater efficiency comes lower running costs and far less annual maintenance required. Divide the peak voltage by the square root of two to obtain the RMS voltage, which is equivalent to the required DC voltage. A DC to AC motor conversion can save you thousands of dollars in energy costs, a reduction in operating costs, and a reduction in maintenance costs. The resulting AC frequency obtained depends on the particular device employed. Signal Controller (DSC). The reading on the display will be the DC voltage converted from the original AC supply. It’s not just the lower capital costs of an AC system compared to a DC system that makes conversion attractive, there are other issues too. DTC the worlds leading AC motor control Model. Heat loss is dramatically reduced, motors and pumps are slowed to an electronically controlled speed and they are also soft started and stopped. There are many applications of DC motor. Investment costs are virtually self-financing. For now, just remember that you must know the output speed of your existing DC motor, and you may need to know the speed of the drive shaft for your piece of equipment. Existing DCmotor is of 37.5 Kw .Also i need to replace 22 Kw ,1460 rpm, 40 A, 415 V in DC motors also produce constant torque across the operating speed range of the motor. While a DC drive produces an easily controlled torque from zero to base speed and beyond, the motor’s mechanics are more complex and require regular maintenance. Reply; lionelsoni. 96 The torque is constant below base speed and decays between base speed and top speed. The inverter (converter) is frequently required in the circuits like where DC to AC conversion is not possible. Flux vector drives with encoder feedback now allow AC motors to achieve rated torque at lower speeds. DTC produces the first “universal” drive with the capability to perform like either an AC or DC drive. The next blog will provide specifics on installation considerations that must be taken into account for an effective conversion. As a dynamic and experienced engineered solutions provider, Sentridge Control has developed a seamless process for conversion of existing DC equipment to the latest AC Motor and ABB AC Variable Speed technology. DC feeds into the primary winding (pink zig-zag wires on the left side) of a toroidal transformer (brown donut), through a spinning plate (red and blue) with criss-cross connections. FOC lets you use DC control techniques for an AC motor, and can remove one of the variables in the motor-selection process for your next design. With DTC there is no modulator and no requirement for a tachometer or position encoder to feed back the speed or position of the motor shaft.The dynamic speed and torque accuracy of DTC drives will be 8 times better than any open loop AC drives and comparable to a DC drive that is using feedback. Such plants must minimize downtime to maximize profitability, and running 24/7 also means brushes will wear faster and must be replaced more frequently. Typically, converting from DC technology to AC will save your process 20-30% in energy consumption. For a constant HP load, the speed is controlled by weakening the field current and keeping armature voltage constant at its nameplate value. I began my career designing machinery for industrial facilities before eventually transitioning to consulting. If motor has brushes, and no permanent magnets, its still pretty simple. When DC motor failures occur, ICT can ship a complete AC Extruder Drive and Motor solution in 24 hours! Current Setup: 1 * 60 HP DC series wound motor (220Vdc) @ 525RPM Frame : MD106 (foot mounted) Arm Current : 235 We have asked an external company to quote for conversion and they have specified the AC motor to be that of a 90kW (VSD controlled). -Bob Baker. 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