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Topic: DC motor

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In the News (Sun 26 May 19)

  Brushed DC Motor
The DC motor is a rotating electric machine designed to operate from source of direct voltage.
A shunt wound DC motor has the stator windings in parallel with the rotor winding.
DC motors are controlled by an H-bridge consisting of four power switches.
www.freescale.com /webapp/sps/site/application.jsp?nodeId=02nQXGrrlPY7r803AF   (259 words)

 Brushless DC Motor
In this respect, the BLDC motor is equivalent to a reversed DC commutator motor, in which the magnet rotates while the conductors remain stationary.
In the DC commutator motor, the current polarity is altered by the commutator and brushes.
On the contrary, in the brushless DC motor, the polarity reversal is performed by power transistors switching in synchronization with the rotor position.
www.freescale.com /webapp/sps/site/application.jsp?nodeId=02nQXGrrlPY7r803B5   (294 words)

  DC Motors - DC Motor Types
Dc motors are often applied where they momentarily deliver three or more times their rated torque.
Dynamic braking (dc motor-generated energy is fed to a resistor grid) or regenerative braking (dc motor-generated energy is fed back into the dc motor supply) can be obtained with dc motors on applications requiring quick stops, thus eliminating the need for, or reducing the size of, a mechanical brake.
DC Motor types: Wound-field dc motors are usually classified by shunt-wound, series-wound, and compound-wound.
www.electricmotors.machinedesign.com /guiEdits/Content/bdeee3/bdeee3_1.aspx   (305 words)

  DC Motors -- principles of operation
The internal configuration of a DC motor is designed to harness the magnetic interaction between a current-carrying conductor and an external magnetic field to generate rotational motion.
Yet another disadvantage of such a simple motor is that it would exhibit a high amount of torque "ripple" (the amount of torque it could produce is cyclic with the position of the rotor).
This is a basic 3-pole DC motor, with 2 brushes and three commutator contacts.
www.solarbotics.net /starting/200111_dcmotor/200111_dcmotor2.html   (1106 words)

  DC Motors - Hansen Motor Corp.
DC motors are often applied where they momentarily deliver three or more times their rated torque.
Dynamic braking (dc motor-generated energy is fed to a resistor grid) or regenerative braking (dc motor-generated energy is fed back into the dc motor supply) can be obtained with dc motors on applications requiring quick stops, thus eliminating the need for, or reducing the size of, a mechanical brake.
DC motors feature a speed, which can be controlled smoothly down to zero, immediately followed by acceleration in the opposite direction -- without power circuit switching.
www.hansen-motor.com /dc-motors.htm   (292 words)

 Building a DC Drive for the Bridgeport Spindle
For all their advantages, DC motors are not used much because both motors and controls are expensive, and the brushed designs require periodic maintenance for brush inspection and replacement.
The new motor is relatively tall and skinny, and therefore requires a custom mounting plate to adapt the face to the opening in the J-head, and to align the drive pulley to the driven pulley.
The center cutout is therefore sized to pass the body of the motor, with notches for clearance to the gussets reinforcing the motor faceplate, and 4 holes for the 5.875" diameter bolt circle attachment of the motor.
truetex.com /dcdrv.htm   (2206 words)

 Small DC Motor Tips
The downside, and its a major one, is that the coreless motor doesn't have the thermal stability of a cored motor with its large iron heat sink.
Motors with any number of poles might also be "skew wound," that is the gaps between the armature poles are slanted with respect to the fixed pole pieces.
As the motor is unloaded and its speed is allowed to increase, eventually it gets going fast enough to generate enough back-EMF to nearly buck the applied voltage and the motor current and therefore torque drops off and the motor is prevented from turning faster.
www.trainweb.org /girr/tips/tips5/motor_tips.html   (1809 words)

 Robot Room - H-Bridge DC Motor Schematic
Also, motors tend to be electrically noisy (spikes) and can slam power back into the control lines when the motor direction or speed is changed.
To determine if your motors qualify, use a multimeter to measure how much current your motor uses under load (for example, when actually driving your robot around) when the motors are connected directly to the battery (not through these chips).
When a motor accelerates or decelerates for any reason (signal, load, or friction), there is reluctance for the electric field present in the motor coils to change.
www.robotroom.com /HBridge.html   (1595 words)

 Pulse Width Modulation DC Motor Control
Often, people attempt to control DC motors with a variable resistor or variable resistor connected to a transistor.
M1 can be any DC motor that operates from 6V and does not draw more than the maximum current of Q1.
Friday, June 15, 2007 5:32:31 PM the pwm (pulse width modulation) is pulses that can given to the mosfet to control by the output of the voltag to the motor and by control the time of the high of the pulse you can control by the speed of the moto
www.aaroncake.net /circuits/motorcon.htm   (689 words)

 Motor Generator - Brushless DC Motor
Your DC motor will have two terminals, lets call them A and B. Say you connect +ve to A and -ve to B and the motor turns clockwise, then when you use the motor as a generator; when you turn the motor clockwise A will be the +ve output.
Brushless DC motors (like computer fans) can be used to generate power when force is applied to their shaft (Like a windmill).
A bldc motor is usually a synchronous 3 phase motor where the comutation of phase currents is controled in the servo amplifier.
www.control.com /1026210450/index_html   (3258 words)

 DC Motor Speed Controller Kit
Vary the speed of your DC motor with this inexpensive circuit.
This circuit delivers the voltage to DC motors with pulses and the speed is controlled via pulse-width modulation (PWM).
This DC Motor controller can handle up to 16Amps, but PCB trace capacity would have to be beefed up with some hookup wire where DC motor current runs through the Printed Circuit Board.
www.electronickits.com /kit/complete/motor/ck1400.htm   (270 words)

 Stepper Motors, DC Motors, Stepper Motor Drivers, Brushless Motors, Brushless DC Motors, Stepping Motors, Step Motors, ...
Brushless DC Motors from 0.9" to 4.8" Diameter
We stock thousands of stepper motor drivers, DC motor speed control drive, microstep drivers, bipolar drivers, stepper motors, (also known as a stepping motor or step motor) brush dc motor, dc motors, brushless motors, servo motors, dc permanent magnet motor, small motors, miniature motor, and large motors.
If you are an OEM looking for a driver or an electric motor of any kind, chances are you will find it here, in stock, at a great price.
www.anaheimautomation.com   (530 words)

 Ac Dc Motor Manufacturers
DC rolling shutter door motor with the control box.
Motorized Treadmill with LED Display for Club or Commercial
Tubular motor is a kind of automatic driving system behind the do
www.alibaba.com /productsearch/Ac_Dc_Motor.html   (686 words)

Condition assessment of DC motors requires a basic understanding of the design and operating characteristics of the various types available: the series motor, the shunt motor, and the compound motor.
DC motor fault zone analysis is a vital part of any DC motor maintenance program.
Components of the shunt motor are the armature, labeled A1 and A2, and the field, labeled F1 and F2.
www.pdma.com /DCmotor.html   (1401 words)

 Converting a Hobby Servomotor to a DC Gearhead Motor
Additionally, because of the robustness of the DC motors used in most hobby servomotors, the control voltage to the motor often can safely be applied at much higher than the five volts typically provided as power support for the standard application of the servomotor.
Desolder DC Motor from Servomotor Electronics The cleanest method of separating the servomotor electrons and the DC motor is to apply a soldering iron on the DC motor leads, and as the solder melts, pull the circuit board away.
Fasten the DC motor as necessary by either "snapping" it in place, screwing it place, or doing whatever is necessary to reverse the previous process of removing it.
www.tedpavlic.com /whitepapers/Conversion_of_Servomotor_to_DC_Gearhead_Motor.html   (2766 words)

 DC Motor Theory   (Site not responding. Last check: 2007-09-26)
The simplest DC motor is a single coil apparatus, used here to discuss the DC motor theory.
One drawback to the motor shown in the diagram is the large amount of torque ripple that it has.
As more coils are added to the motor, the torque curve is smoothed out as seen in Figure 2, the diagram of the torque curve for a two-coil DC motor.
etidweb.tamu.edu /projects/labview/closedloop/motor.htm   (511 words)

 Determining DC motor rotation direction
Aug 1, 1996 12:00 PM, DeDad, John A. While DC motors are applied mostly in special applications, knowing how to properly connect them is important to their required performance.
With the motor short shunt connected, the shunt field is added to the series field current, resulting in the motor having stronger torque characteristics.
A compound wound motor has two separate field windings: A shunt winding, which is wound with smaller wire and has thousands of turns, and a series winding, which is wound with large wire and only has a few turns.
ecmweb.com /mag/electric_determining_dc_motor/index.html   (748 words)

 DC motor
In the diagram you can see two magnets in the motor: the armature (or rotor) is an electromagnet, while the field magnet is a permanent magnet (the field magnet could be an electromagnet as well, but in most small motors it is not to save power).
The key to an electric motor is to then go one step further so that, at the moment that this half-turn of motion completes the field of the electromagnet flips.
In a two-pole motor, if the electromagnet is at the balance point, perfectly horizontal between the two poles of the field magnet when the motor starts, you can imagine the armature getting "stuck" there.
math.haifa.ac.il /robotics/dcmotor.htm   (1648 words)

 Direct Current Motor Basics
In all DC motors, except permanent magnet motors, current must be conducted to the armature windings by passing current through carbon brushes that slide over a set of copper surfaces called a commutator, which is mounted on the rotor.
The construction of a DC motor is considerably more complicated and expensive than that of an AC motor, primarily due to the commutator, brushes, and armature windings.
Shunt motors are prone to armature reaction, a distortion and weakening of the flux generated by the poles that results in commutation problems evidenced by sparking at the brushes.
bg.ecmweb.com /ar/electric_direct_current_motor/index.htm   (709 words)

 Overview Tutorial of Electric Motor Types
In most DC motors, several sets of windings or permanent magnets are present to smooth out the motion.
The maximum armature voltage which corresponds to a motor's rated speed (these motors are usually given a rated speed and a maximum speed, such as 1750/2000 rpm) are available in certain standard voltages, which roughly increase in conjuntion with horsepower.
This is partly due to the simplicity of control, but is also partly due to the fact that most industrial DC motors are designed with variable speed operation in mind, and have added heat dissipation features which allow lower operating speeds.
www.oddparts.com /acsi/motortut.htm   (1438 words)

 DC Motors -- motor (mis)behavior
Since the construction of a finished motor will not (!) change during operation, a constant of proportionality between the motor current and the materials / geometry dependent factors can be calculated for a given motor.
Because of the interrelationship of torque, speed, current, and voltage, the constant current operation of a DC motor produces constant output torque regardless of speed.
For DC motors operated at a constant voltage, the speed and torque produced are inversely related (the higher the torque, the lower the speed of the motor).
www.solarbotics.net /starting/200111_dcmotor/200111_dcmotor4.html   (747 words)

 DC Motor products
A DC motor is an electric motor which spins when voltage is applied to its terminals.
DC Motor - Portescap New 22mm Brushless Motor
Manufacturer of high quality DC moving coil brush dc motors and brushless dc motors, planetary gears and spur gears, gearheads, incremental encoders and optical encoders, hall effect devices, resolvers, tachometers, brakes, servo amplifiers and motion controllers.
www.motioncontrol.com /dcmotor   (1073 words)

The DC connection terminals on this model have been designed to allow for soldering and mounting purposes - they are flat and parallel to the face of the motor.
Motor is incased in a fl aluminum, heat-sinking sleeve with a 30mm square mounting bracket on one end.
Small DC motor, metal bracket and axles, and an assortment of small plastic gears and collars to produce a gear train of various ratios.
www.73.com /a/0082.shtml   (3491 words)

 District of Columbia: Department of Motor Vehicles   (Site not responding. Last check: 2007-09-26)
In observance of DC Compensated Emancipation Day, the Department of Motor Vehicles will be closed on Saturday, April 14 and Monday, April 16.
The District of Columbia Department of Motor Vehicles Southwest Service Center, located at 95 M Street,SW, is experiencing a power outage and is now closed for transactions.
In observance of DC Compensated Emancipation Day, the Department of Motor Vehicles will be closed on Saturday, April 15 and Monday, April 17.
dmv.washingtondc.gov /main.shtm   (794 words)

 Physical Computing
To control a DC motor from a microcontroller, you use switching arrangement known as an H bridge.
When 2 and 3 are closed and 1 and 4 are open, polarity is reversed, and voltage flows from the supply to 3 to the motor to 2 to ground.
A DC motor's speed is proportional to the supplied voltage.
www.tigoe.net /pcomp/dc-motor-control.shtml   (523 words)

 Electric motors and generators
As in the DC motor, the ends of the coil connect to a split ring, whose two halves are contacted by the brushes.
When the motor is loaded, then the phase of the voltage becomes closer to that of the current (it starts to look resistive) and this apparent resistance gives a voltage.
Similar linear motors, although of course without the paper cone, are often used to move the reading and writing head radially on a disc drive.
www.physclips.unsw.edu.au /jw/electricmotors.html   (4685 words)

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