Application of dc motor in daily life

Nidec's small precision motors contribute to the development of the information society and comfortable office environments.

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Having earned a reputation for their reliability, Nidec's motors are used in a variety of applications in healthcare and medical equipment. ATMs, automatic doors and commercial air conditioners are examples of everyday equipment in which motors are used. Motors are widely used in industrial applications. Nidec offers solutions ranging from stand-alone products to advanced systems and turnkey projects. The automobiles of the future and other vehicles and robots that make our lives more comfortable are made possible by Nidec's motors.

Applications of DC Motors

On smaller, permanent-magnet DC motors, brushes easily and quickly can be changed. They are inexpensive and only take minutes to replace. A good rule of thumb is to replace the brushes once they reach one-third of their original length or every 2, hours of use, whichever comes first. This will ensure the brushes are always within specification.

Although brush maintenance is often seen as a disadvantage compared to AC motors, brushes in DC motors continue to improve. Designs that reduce brush wear, such as smaller diameter commutators, extend motor operating time between brush replacements. The design of the brush — including the surface area, shape and contact pressure — can also extend brush change intervals. DC motors are often selected instead of AC motors for many reasons see Table 1.

Motors In Everyday Life | Nidec Corporation

DC motors and controllers are often the low-cost option when compared to inverter-duty AC motors and drives. This is especially true for fractional hp applications. DC motors have been around for more than years, so they have a large installed base and corresponding widespread familiarity with their operation and maintenance. For existing installations, replacing a DC motor with a new one — as opposed to redesigning the motor circuit to use an AC motor and drive — is almost always less expensive, quicker and easier.

Along the same lines, the simple design of DC motors makes service, maintenance and control well understood and easily supportable. Field excitation is not required, and brush replacement and motor service are well understood by the typical industrial electrician. Even speed control is simple: Just adjust the terminal voltage, often using a local potentiometer. Additionally, until the late s, when the variable frequency drive VFD was fully developed, DC motors were the best choice for variable speed control, and this remains a well-supported option. While the ease of controlling motor speed was a big part of its early success, several other DC motor characteristics make them the best choice in certain applications.

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  • DC MOTOR – Basics, Types & Application!
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DC motors develop full torque at low speed and across the full operating range from zero to base speed see Figure 1. This makes DC motors a good choice for driving constant-torque loads — such as conveyor belts, elevators, cranes, ski lifts, extruders and mixers. These applications are often stopped when fully loaded, and the full torque of the DC motor at zero speed gets them moving again without the need for oversizing.

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DC motors have a higher power density and are, therefore, smaller than an equivalent AC motor. They have no field coil in the stator, so the field coil space is saved, reducing the overall motor size. This becomes a substantial benefit in some space-constrained applications. Figure 1.

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  2. Applications of DC Motor [ Series, Shunt & Compound Motor ].
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  4. Unlike an AC motor, a DC motor delivers constant torque across its entire speed range. Smaller form factors also mean DC motors have less inertia than AC motors, offering quicker acceleration and deceleration times. This can result in a quicker cycle time on production machines that start and stop often. Although not often needed, DC motors can be manufactured to motor power ranges of more than 4, hp, whereas standard low-voltage induction motors do not go above to 1, hp.

    Above that, higher voltages are needed, which can greatly complicate installation and maintenance.

    Applications of DC Machines

    Modern AC motors and drives have narrowed the performance gap with their DC counterparts, but general-purpose DC motors still outperform general-purpose AC motors by many measures. Less electronics and rectification are required to build a DC-converter drive when compared to building an AC-inverter drive. DC motors can be directly fed from different power sources, even batteries. Depending on the type of DC drive, the quality of the output power varies dramatically and is typically measured by how much ripple current is produced by the drive.

    High ripple current results in increased motor heating and possibly premature brush failure. Limiting the form factor to 1. A battery is an ideal current source because its form factor is 1.

    5 useful things from DC motor - For daily use

    A pulse-width-modulated DC drive emulates pure DC closely with a form factor of 1. A single-phase, full-wave rectified DC drive is the most common form of DC drive used in the 0. This drive takes an AC voltage and passes the positive half of the waveform and rectifies the negative part of the waveform to produce a waveform with a form factor of 1.

    The reasons come from the user base, R&D and the application.

    These drives are commonly referred to as silicon-controlled rectifier SCR drives. A simple, single-phase, half-wave rectified DC drive has a much worse form factor. These drives only pass the positive half of the AC sine wave and have a form factor of 1. These half-wave DC drives are not recommended for use with most DC motors. DC motors are suitable for many applications — including conveyors, turntables and others for which adjustable speed and constant or low-speed torque are required.