An electrical actuator converting electrical energy into rotational motion.

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1answer
66 views

How do I supply power to two 18v 2.4 amp motors?

I have two of these motors: http://www.radioshack.com/radioshack-super-speed-9-18vdc-hobby-motor/2730256.html#q=motor&start=6&tab=tab1 According to Radioshack's specs (which may be off, not ...
2
votes
1answer
28 views

Where to buy PMSM motors?

I read a research paper that explains why permanent-magnet synchronous motors (PMSMs) are better suited for high-precision position control than brushless DC motors (BLDCs). I'd like to buy one, but ...
1
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1answer
62 views

Resistance and Inductance of a ceiling fan motor needed to spec snubber

I'm looking to specify (well, suggest) a RC snubber network for someone over on diy.se who is having EMI problems with his ceiling fan knocking out his TV briefly on turn-off: ...
0
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0answers
36 views

Belt moving around [on hold]

I need a syringe to move about in a set loop. The 'map' for it to move on is very squiggly, and it needs to move a short distance precisely (to the nearest 0.1mm). How to I do this? Also, I will be ...
1
vote
1answer
48 views

Make a brushed DC motor move “free”

I want to place a DC motor on the driveshaft of a marine steam engine. Since i do not want to loose or add power to the drive but only having the motor there for backup reasons, i want to let the DC ...
0
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1answer
59 views

why 'V' curve of synchronous motor doesn't touch D.C. field current axis?

Why synchronous motor armature current doesn't become zero with field excitation change ? it can be seen from 'V' curve.?
21
votes
11answers
6k views

I'd like to learn how to make my own USB gadgets

I've been writing Linux character device drivers for other people's stuff for some time. I'd like to find a new hobby and the thought of making my own USB gizmos seems really neat. I would be ...
0
votes
3answers
102 views

Reversing polarity of motor with timer

I have a timer that allows me to preset times and run a motor for a predetermined amount of seconds. I need this to reverse polarity as soon as this predetermined time has expired. The timer is a ...
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0answers
34 views

Help with 8 wire stepper motor [on hold]

Hey guys here is a picture of my 8 wire stepper motor. Unfortunately There is no sign of model number on it. Using a multimeter here's what I found Red - black: Beep Black - white : Beep Red - ...
0
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1answer
30 views

Dupont connector for 5A

I have to do a connector adapter, that has to handle 5A current, from a pwm motor driving circuit(power mosfet), to the motor. I have not found the current rating for dupont connectors It is ...
0
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2answers
55 views

resistive braking for induction motor?

It occurred to me that since single-phase AC induction motors can act as generators, it might be possible to brake an induction motor with a resistive load. The basic idea is that when you want to ...
0
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1answer
42 views

Need a very low power, low force motor/actuator

What are some alternative types of motors/actuators that can be used instead of servos? I need some way of inducing a slight bit of motion/movement but with very little force and power consumption. ...
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votes
1answer
19 views

reverse load on dc motor( series/shunt) and its speed control

if dc motor produces 10 Nm torque , and load acting on dc motor in reverse direction produces 6 Nm , then net torque is 10-6= 4Nm, dc motor consumes current corresponding to 4Nm , and so speed becomes ...
0
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1answer
27 views

What is the difference between an H-Bridge Motor Driver and Dual motor driver board?

I don't understand the difference between a motor-driver like this IC H-Bridge Motor Driver and a motor-driver like this Dual Motor Driver Board. When reading about them they do the same thing but the ...
0
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0answers
93 views

Generating a PWM signal to drive stepper motor

I need to drive a stepper motor with a PWM signal. I am using the Panasonic FP0RC16CT to create the signal. How would I go on about achieving this? What instructions would I use? The signal needs to ...
0
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0answers
27 views

Electric motor for a sliding gate [closed]

I am doing a micro controller based project to control a sliding gate at residence. But am stuck at choosing the right motor for sliding the gate. The gate weight is around 80-100kg. Help me choose ...
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votes
0answers
110 views

Why didn't Tesla opt by Switched Reluctance Motors? [closed]

After reading the virtues of Switched Reluctance Motors, I question why didn't the Tesla cars company opt by them instead of AC triphasic motors?
0
votes
1answer
55 views

Fan Control using Motor Driver, looking for suitable solutions

I want to control the speed of a fan (which is a 2-phase brushless DC motor). I am currently using a suitable power supply to run the fans. My source is a Data Acquisition device that outputs up to ...
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0answers
43 views

I am looking for a 12V DC motor that can supply 36W power… [closed]

Where is the best place to buy something like this? It is needed for an automotive application - It will run off the battery/alternator and need to supply 36W. I need to apply 3000N of force over ...
2
votes
2answers
217 views

Operation of a Growler to test armature shorts

Can someone explain to me how a Growler for testing electric motor armatures works please? I have obviously read the Wikipedia Growler page but it is still foggy. So the growler unit acts as the ...
1
vote
0answers
17 views

Precise rotational movement and locking [migrated]

I am constructing an autonomous, unmanned boat for voyages of several months. Traditional autopilots use a linear actuator to move the tiller but require several adjustments per minuted, will consume ...
0
votes
1answer
41 views

How Number of commutator segments,air gap between the segments of brush dc motor affect on performance of DC motor..?

plese help me about how Number of commutator segments,air gap between the commutator segments of brush dc motor affect on performance of DC motor..?? now if we we change the number of commutator ...
0
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0answers
12 views

Induction motor constant flux calculation

I am working on a model of Indirect Field Orientation Control of Induction Motor in Simulink/Matlab. I have it all worked out, except the flux command. I would like to keep the flux at constant value ...
-2
votes
1answer
50 views

120v AC motor on 220v supply? [closed]

What happens when a 120v 15A AC motor is connected to a 220V supply? In case this is a destruction, what should be the power rating of a converter that is to be used?
3
votes
2answers
1k views

Choosing relay to operate water pump

Based on my research so far, I've concluded that a relatively low-cost, yet reasonably reliable way to control operation (on/off) a motorized water pump, is a well spec'd EM-relay with flyback diode. ...
0
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2answers
63 views

Need help to vibrate a motor for an original musical instrument

everyone. I am asking you to help me out for making original musical instrument. The goal is to vibrate a small motor by square wave signal witch is generated in a synthesizers in my Mac. Here is ...
0
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0answers
47 views

using a sycnrhonous motor to drive the voice cone in a speaker

It is possible to consider any arbitrary signal as a continuous function of phase and amplitude. In particular, a digitized audio recording (assuming Nyquist was satisfied) can be transformed into a ...
2
votes
2answers
99 views

What can be the reason for a voltage drop across daisy chained RS485 servo motors?

We are using a set of RS485 servo motors(Robotis EX-106) for our humanoid robot. This motor has a 4 pin connections namely Ground,VCC, D+ and D-. The Ground and Vcc terminals are from the power ...
2
votes
2answers
454 views

Controlling speed of motor through L293D using TLC5940NT

I am trying to control a DC motor through an L293D. Ultimately I am controlling it with an Arduino, but I am trying to use a TLC5940NT chip as an intermediary to increase the number of outputs that I ...
0
votes
3answers
123 views

Relay not switching correctly, controlled from ATtiny85, output to motor

I have an ATtiny85 switching an NPN transistor, which will in turn switch on a relay that will run a motor. Everything is run off a 3.7V 18650 Li-Ion battery, but I have since moved over to a variable ...
1
vote
1answer
64 views

How to prevent DC motor from dropping voltage of supply when switching on

I have a circuit which uses an ATtiny85 output to a transistor (S9013), which will trigger a relay that controls a motor. The reason for the transistor to relay is because I do not have a transistor ...
0
votes
1answer
90 views

Mechanical Power (Application) and Electrical Power (Stepper Motor) Discrepancy

For my application I need a torque of \$\tau=0.87 \, Nm \$ and a speed of \$ w=140 \, RPM \approx 14.65 \, rad/s \$. This gives me a mechanical power \$ P_m=12.75 \, W\$. $$ P_m=\tau w $$ I have ...
0
votes
1answer
65 views

Systematically, what would happen if I give a crank at the shaft of a motor?

In particular, I would like to know what would happen if I crank the shaft of the following kinds of motor: brushed DC, brushless DC (the kind used in computer fans now) and 6-coil 3-phase AC ...
0
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1answer
90 views

PMSM inductance in DQ domain

The “abc <-> DQ” transformation matrix used for transforming currents, voltages and magnetic field can they be used for transforming inductances also? as given below-
1
vote
0answers
67 views

Current/Torque - curve for an ASM

There is this exercise where I don't have a clue how to get the solution. It's about asynchronous machines, where with the help of field coordinates the string currents (istr) are split up into ...
0
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0answers
9 views

PM synchronous motor parameter measurement

I am trying to find the parameters of a surface mounted PM synchronous motor using the application note AN4680 (PMSM Electrical Parameters Measurement) and had some queries regarding it. The Ld ...
2
votes
2answers
102 views

How to find I-V characteristics of motor?

I have a motor that I'm turning with another motor. I can determine the speed of rotation with a tachometer. One motor is powered with a power supply and it is coupled with another motor. I need to ...
0
votes
3answers
40 views

ATtiny85 to control a relay, which will turn on and off a motor

I am trying trying to control a 5V relay (SRD-05VDC-SL-C) with the ATtiny85. I have a simple sketch uploaded (Blink without Delay example): ...
-1
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4answers
217 views

Torque and Back EMF Waveforms of Brushless Motors

For simplicity, I'm going to be talking about a single stator phase. I understand that torque is proportional to current, and that back EMF is proportional to angular velocity. However, after ...
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0answers
52 views

Forgot to connect ground for H-bridge, now it doesn't work?

I have an TLE5206 h-bridge IC that can handle 5 amps and I'm giving it a supply voltage of 12V. I was just testing the motor with the power connected but I noticed that the ground cable broke off ...
1
vote
1answer
122 views

Regenerative braking at any speed below maximum - how is it done?

My mobility scooter has a motor controller with regenerative braking - but regeneration seems to take place even at low speeds, well under the maximum! I know it does this because if I reduce throttle ...
0
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0answers
25 views

Explanatory electromechnical animations: What software used?

My friend is trying to show a hall effect sensor setup. He wants both the electrical oscillograms and the mechanical view of a rotating signal (from the motor). What software exists to aid in ...
33
votes
10answers
40k views

Why does a Tesla car use an AC motor instead of a DC one?

I was just watching a mega factory video and wondered why they use an AC motor which requires a power inverter instead of DC which may be powered directly from their DC battery? Introducing an ...
0
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2answers
64 views

Does frequency equal the number of steps a stepper motor will do?

http://www.thorlabs.us/thorcat/ETN/ZFS13B-Manual.pdf I am supplying a driving PWM signal to this stepper motor. However, I want to specify exactly how many steps to take with this motor. Does the ...
0
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0answers
43 views

Would there be advantage using 2 smaller motors on Tesla car's rear axle? [migrated]

Let me be clear: I am speaking about the rear wheel drive model. After I've asked https://mechanics.stackexchange.com/questions/15342/number-of-motors-rwd-tesla , it seems Tesla's rear axle has only ...
0
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1answer
20 views

Power requirements for offset motor or other forms of vibration

I need to generate vibrations to provide tactile feedback. The device has minimal power available. What type of power do offset motors require? Are there other forms of vibration that can use less ...
0
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1answer
61 views

Is there any way I can power my 120-220V AC motor from a battery

I am building a new robot, it's a little bit heavy, so it's hard to find a motor that can push it. I am thinking of a way to use machines at home (I have two options: Automatic hair drying machine and ...
0
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1answer
65 views

Motor without magnetism [duplicate]

Every electric motor I know, takes electricity and converts it over a magnetic field, for generating movement. Is it possible to generate significant movement, based only only on electrons movement? ...
0
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1answer
81 views

Desired response of PI controller in motor vector controller

In vector control (field-oriented control) of motors (specifically induction motors), a rotating reference frame is attached to the rotor flux to give "DC" values in the current controller. This ...
0
votes
2answers
86 views

How to reduce the amplitude of my PWM signal?

I'm using a PWM control signal that ranges from 0-24V to drive a stepper motor. However, the datasheet in the driver says it should range 0-5V. How can I bring down the amplitude of my PWM control ...