How Do I Connect a Single Wire to a DC Motor?

if you dont have the two leads on the back, then do this connect one wire to the outside of the motor(metal part), and the other wire to the middle of the motor on the back(will be metal again) it will be inefficent this way,but will work

1. PID control at small PWM values for a DC motor

You have backlash in the gear train which is like electrical hysteresis. That is causing "hunting". You can minimize the backlash by preloading as in anti-backlash gears. You can adopt a simpler control scheme such as P (perhaps with some control deadband) or PD. The integral term, if present, will integrate any remaining error until motion occurs (unless the I term has deliberate or accidental deadband itself - say due to low ADC resolution).You might want to read this paper by Tim Wescott. Tim does a lot of work with precision electromechanical systems used in military and similar applications.

2. golf cart continuous duty dc motor?

A wind generator is a flowery identify for a dc fan Now to generate dc current with wind vigour using a dc motor because the generator that's an different story. You can do it with a permanent magnet motor a fan blade pulleys and a fan belt however this could be so inefficient as to be barely ready to measure the output voltage. And sure if you spin a permanent magnet dc motor it will generate volts try it just chuck the shaft of 1 up in a drill and hook up a voltmeter to the motor leads not much output nevertheless it's measurable.

3. in a dc motor, what is the meaning of continous?(current,torque,power)?

if your tool is running on say 110 volts and you bog it down,its still puling a 110 volts,but then the amps start going maybe it means that it runs good at 110 volts but it will increase its amps to try and compensate for the load that your bearing on the tool,maybe it needs AT LEAST that many volts to run at all,

4. Will low voltage damage a 12 volt dc motor?

If you are talking about a blower motor no low voltage will not hurt or damage it. Actually this is how your blower motor has different speeds. The 12 volts from the battery is dropped across a resistor coil or directed directly to the motor changing the voltage to the motor. The blower motor depending on manufacturer can run on as little as 6 volts some even lower. As for running under water, even if it could I would expect that it would not last long when rust starts I would assume this would cause binding in the bearings. Yes I know what I am talking about I am a state licensed mechanic.

5. Why use stepper/DC motor driver?

Maximum current of microcontroller output (typically 10-20mA) is not enough to drive motor coil.Connecting motor directly to microcontroller will damage microcontroller output transistor.Easiest way to connect DC motor to microcontoller is circuit like this:Image source and more information: link.

6. fast please..constracting a circuit using logic gate and a dc motor?

The output of a 7400 series IC can sink current well, but not source much and the 'high' voltage is not near 5V. The best way to drive a transistor from such a gate is to drive it from the low level (which is the 'active' state of a NAND gate anyway). You can then use a PNP transistor to switch the 5 feed to the load, with just two resistors (eg. 1K each) from base-emitter and the chip output to the base. If you must go directly from the gate and use high for on, the best option is a logic-level N Channel FET. That will switch on at something like 2 - 3 volts on the gate, so a reasonable match for a TTL output. Connect the gate output directly to the fet gate and add a pull-up resistor to 5V to ensure a decent 'high' level (eg. a 4k7). The FET could be any small logic-level device, eg. a 2N7000 or 14N05 depending if the motor is low or high current. You do not give the motor current, so I can not say exactly what transistor you need! If you can get a PNP bipolar transistor more easily than a FET, you could use another gate from the 7400 as an inverter so the High from your first gate gives a Low to the PNP transistor circuit to turn the motor on. As it's only a 3V motor, you could possibly get away with a PNP bipolar transistor in emitter-follower mode, with the base connected directly to the output of the gate plus a 4k7 pullup resistor to help get a better high level. That's the simplest of the lot, but not very efficient as the transistor will have more voltage across it while running the motor, so only suitable for a very low current load.

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Shunt DC Motor Controller Improvement
Shunt DC motor controller improvementSo this looks as if the circuit controls armature current?It controls armature voltage.would it be better if the winding current was controlled?Controlling armature current with an outer voltage or speed control loop would be better, but more complex.By "winding current" I suspect you mean field winding current as apposed to armature winding current. Controlling the field winding current would make the minimum operating speed about equivalent to the present maximum speed. Reducing the field current will increase the speed and reduce the torque capability. I doubt very much that is what you want.The above seem to be the only actual questions asked. The question seems to imply that you wish to improve the control scheme because the motor " runs slightly erratically." You have not actually described what aspect of motor performance is undesirable.Speed decrease with increased load is normal for a simple armature voltage control. Random speed variation with a steady load could be due to line voltage variation, other power quality issues, motor brush problems or a loose connection. Failure to start relably would like be a brush problem— — — — — —Can you use an AC switch with a DC motor?Just follow the ratings of the switch. Typically, the DC voltage rating is less than the AC voltage rating. Current ratings are normally the same— — — — — —What is an interpole in a DC motor?Thanks for A2A.Purpose of Interpole in DC MachineFor understanding the role of Interpoles, we need to understand the effect of armature reaction in the DC Machine. The effect of armature mmf on the main field flux is to distort the main field flux and to reduce the net main field flux. The figure below, shows the effect of armature mmf on the main field flux. It is quite clear from the above figure that the flux at the location of Carbon Brush i.e. A, B and A are not zero and therefore an EMF will be induced in the coils undergoing commutation and will lead to the sparking. As we know that for better commutation, the coils short circuited by the brushes should have zero EMF induced in them. As the zero crossing of field flux is shifted due to armature reaction, the coils undergoing the commutation will have a net EMF induced in them. This induced EMF in the short circuited coil will delay the reversal of current in the short circuited coils and will result into poor commutation and sparking at the carbon brushes.The question arises how to resolve this issue?If we see the figure above, we observe that there is a net shift of zero crossing of net flux in the air gap by an angle Ɵ in the direction of rotation for Generator and opposite to the direction of rotation for Motor. So the cheap and easy solution shall be to shift the Carbon Brush at Zero Crossing of the air gap flux.Thus carbon Brush need to be shifted by an angle Ɵ from Geometrical Neutral Axis (GNA) in the direction of rotation for Generator and opposite to the direction of rotation for Motor.But this method of shifting the Carbon brush has a big disadvantage. What is that?As the Armature Reaction depends on the current flowing through the armature winding which in turn depends on the load current. Therefore as the loading of the DC Machine varies the angle Ɵ will also vary and therefore we need to continuously shift the Carbon Brushes. So we need to find a smart way.Again, looking back to the figure, if it could be possible to make the resultant or net air gap flux zero at GNA, then there would not have been any detrimental effect of armature reaction on commutation. Also, the existing flux at the GNA (at point C) is due to North Pole so we could use a South Pole (opposite of the pole which produced the imbalance at C) at C so that the net flux at C becomes Zero. Similarly at C' we can use a North Pole to make net flux Zero there. Okay, this will work fine but how t change the magnitude field strength of this newly installed poles at C and C'? Hmmmm. .We can use a winding on the newly installed poles at C and C' and connect that winding in series with armature winding so that the strength of field due to newly installed poles at C and C' varies proportionally will the loading of machine. Yes, this will work fine.So we can conclude our solution as,We will use Poles same as that of Main Poles ahead of GNA or Carbon Brush for Generator at the location of GNA or Carbon Brush and Poles same as Main Pole that of behind the GNA or carbon Brush for Motor at the location of GNA or Carbon Brush and will use winding on them and connect them in series with the armature winding as shown in figure below.The Poles used in our smart solution is called the Interpole. Interpoles are narrow poles placed at the GNA and fitted to the Yoke and also known as Commutating Poles or Compoles. For generator, the polarity of Interpoles must be same as that of main Pole ahead of it in the direction of rotation. For Motor, the polarity of Interpole must be same as that of Main Pole behind it. So I expect that you understand the purpose of Interpoles as you only designed it. But there is one more interesting role of Interpole.Interpole do not only nullify the effect of armature reaction but in addition, produces some extra mmf in the interpolar zone. This extra mmf in the interpolar zone induces rotational EMF in the short circuited coil undergoing commutation in such a direction to oppose the reactance voltage in the coil. Thus the resultant the resultant voltage in the short circuited coil becomes zero and the commutation is spark less.What is an interpole in a DC motor?
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