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Can you short a DC motor?
To stop the motor hard you short its connections. A simple but not elegant way is to use a relay. Make sure the first transistor is off, then energize the relay.
What happens if you short a DC motor?
When the motor is shorted, all the mechanical power from external things driving its shaft ends up getting dissipated in the motor as heat. As long as the motor can handle that heat, there is no problem. It should take no power electrically to keep the motor shorted.
What causes a DC motor to short?
The short circuit is caused by a buildup of dirt, copper particles, and debris between commutator segments. The segments are then shorted together resulting in arcing between the brushes. A flashover can be catastrophic to the motor and motor brushes.
How can a DC motor be stopped instantly?
A DC motor can be stopped by shorting the motor terminals.
How do you check if a motor is shorted to ground?
To test your motor for short to ground, you’ll need to set the multimeter to ohms and disconnect the motor from its power source. Then inspect each wire and look for infinite readings. Alternatively, if you get a reading of 0, you might have a cable issue.
What happens if armature is short circuited when it is running?
The circuit with the ground and the short circuit between own starter motor does not turn because there are not enough windings. In the latter, the motor turns but there are magnetic fields. This is also called as short circuit fault.
Can I connect DC motor directly to battery?
Yes. No need for voltage regulator or similar. Voltage would be ~24V minus some voltage drop on transistors on H-bridge, so it is safe for motor, because this is the voltage the motor is rated for.
How can you tell if a DC motor is bad?
Measure the resistance between the motor terminals and compare it with a known good motor (or the datasheet). If the coils have melted, they will have shorted and you’ll see a lower resistance. Or they will have broken altogether, and you’ll read infinite resistance.
How do you test if an electric motor is shorted?
You should test the windings for a “short to ground” in the circuit and open or shorts in the windings. To test your motor for short to ground, you’ll need to set the multimeter to ohms and disconnect the motor from its power source. Then inspect each wire and look for infinite readings.
How do you ruin an electric motor?
- High Temperatures and Heat. …
- Exposure to Dust and Contaminants. …
- Power Surges and Other Supply Issues. …
- Excessive Humidity and Exposure to Moisture. …
- Over or Under-Lubrication.
What is the most common cause of motor failure?
…
Shaft imbalance
- Dirt accumulation.
- Missing balance weights.
- Manufacturing variations.
- Uneven mass in motor windings and other wear-related factors.
What causes the motor to trip?
Electric motor tripping reasons and how to fix them- The electric motor tripping may be due to a couple reasons, it may be due to the circuit overloads, short circuits, ground fault surges, low resistance, over-heating, contamination, vibration, cable/wire is cut, due to the motor direction clockwise or anti-clockwise, …
What are the different methods of braking DC motor?
The three types of braking for DC motors include regenerative, dynamic and plugging.
Which of the following is a common method of braking a motor?
Which of the following is a common method of braking a motor? A DC voltage that is required to stop an AC motor is 75% of the peak-to-peak AC voltage applied to the motor. An elevator is a common application where motor braking is required.
What is plugging method of braking?
Plugging is the braking method in which a reverse torque is generated by applying reverse voltage or phase sequence to the motor. Plugging is the fastest braking method since it drives the motor to reverse no matter what the running speed of the motor is.
How can you tell if a DC motor is bad?
Measure the resistance between the motor terminals and compare it with a known good motor (or the datasheet). If the coils have melted, they will have shorted and you’ll see a lower resistance. Or they will have broken altogether, and you’ll read infinite resistance.
How do you test if an electric motor is shorted?
You should test the windings for a “short to ground” in the circuit and open or shorts in the windings. To test your motor for short to ground, you’ll need to set the multimeter to ohms and disconnect the motor from its power source. Then inspect each wire and look for infinite readings.
arduino – How to short a DC motor? – Electrical Engineering Stack Exchange
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Braking a small, high-speed DC motor – Electrical Engineering Stack Exchange
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How do I check a DC motor for shorts? | eHow UK
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- Summary of article content: Articles about How do I check a DC motor for shorts? | eHow UK Pull the rotor from the stator portion of the motor, if the ohm test still registers a zero ohm or short reading between the windings and the motor frame. …
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Short Braking
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History[edit]
Components[edit]
Motor supply and control[edit]
Types[edit]
Self-commutated motor[edit]
Externally commutated AC machine[edit]
Special magnetic motors[edit]
Comparison by major categories[edit]
Electromagnetism[edit]
Performance parameters[edit]
Acoustic noise and vibrations[edit]
Standards[edit]
Non-magnetic motors[edit]
See also[edit]
Notes[edit]
References[edit]
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How to short a DC motor?
\$\begingroup\$
To stop the motor hard you short its connections. A simple but not elegant way is to use a relay. Make sure the first transistor is off, then energize the relay.
A more elegant solution would be to put a P channel FET or PNP transistor accross the motor:
Q1 is used to turn on the motor as you have it now. Q3 will short the motor and therefore electronically brake it when turned on. R2 keeps Q3 off when no current is being deliberately drawn from its base. Q2 is a current sink when enabled, which turns on Q3.
The worst case current the brake has to handle is the maximum current you ever put thru the motor, which you say is 700 mA. Let’s say Q3 has a minimum guaranteed gain of 25. That means it needs 28 mA to turn on. If BRAKE is a 5V logic signal, then there will be about 4.3 V accross R3 when BRAKE is high. 4.3V / 100Ω = 43 mA, which is good enough to keep Q3 saturated with up to 1.1 A of collector current. A little margin like that is good, and the extra base current will keep the saturation voltage of Q3 low when on.
You shouldn’t need to turn on the brake for very long each time, so a little extra current thru Q2 shouldn’t matter. Make sure Q1 is off, wait a few µs to make sure it has finished turning off, then enable BRAKE. With experimentation you can find the minimum brake time to guarantee the motor has stopped. Add a little, then turn off BRAKE after that.
How to short a DC motor?
\$\begingroup\$
To stop the motor hard you short its connections. A simple but not elegant way is to use a relay. Make sure the first transistor is off, then energize the relay.
A more elegant solution would be to put a P channel FET or PNP transistor accross the motor:
Q1 is used to turn on the motor as you have it now. Q3 will short the motor and therefore electronically brake it when turned on. R2 keeps Q3 off when no current is being deliberately drawn from its base. Q2 is a current sink when enabled, which turns on Q3.
The worst case current the brake has to handle is the maximum current you ever put thru the motor, which you say is 700 mA. Let’s say Q3 has a minimum guaranteed gain of 25. That means it needs 28 mA to turn on. If BRAKE is a 5V logic signal, then there will be about 4.3 V accross R3 when BRAKE is high. 4.3V / 100Ω = 43 mA, which is good enough to keep Q3 saturated with up to 1.1 A of collector current. A little margin like that is good, and the extra base current will keep the saturation voltage of Q3 low when on.
You shouldn’t need to turn on the brake for very long each time, so a little extra current thru Q2 shouldn’t matter. Make sure Q1 is off, wait a few µs to make sure it has finished turning off, then enable BRAKE. With experimentation you can find the minimum brake time to guarantee the motor has stopped. Add a little, then turn off BRAKE after that.
Is it bad to short a DC motor for a long time?
\$\begingroup\$
I am using one of those small yellow “robot” DC motor like this one, on a circuit where the motor will turn on a couple of times under certain circumstances.
I am thinking of designing a normally-closed circuit where both poles of the motor are shorted at all times to keep it stopped.
When a sensor goes off, one of the poles will be grounded and the motor will spin until the sensor goes on again, shorting the motor and braking it.
My question is: is it bad to keep the poles shorted for a very long period? Both in terms of damaging the motor and power consumption.
The “very long period” would be 24/7, with the motor turning on for ~5 seconds every 6 hours.
EDIT: Here’s the schematic, haven’t tested it yet but this is more or less what I’m planning to do.
simulate this circuit – Schematic created using CircuitLab
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