Motor Definition and 1000 Threads

Homework Statement I can not understand this question: "Describe the characteristics of a three-phase induction motor?" Does it mean speed,torque,etc? Thanks Homework Equations The Attempt at a Solution

how would you calculate the resistance required for a resistor which is in series with a generator (DC motor in reverse) to achieve a certain torque from the generator? Eg, there's a torque of 30kN acting on a 100kW generator while it moves at 50RPM. The is the same mechanism as electric...

I want to design a bidirectional DC motor , so use four transistors in the H bridge circuit. I can understand the first circuit, but for the second, I can't understand why input signal , eg: A, is connected to the same side of transistors? What is the differences, which one I should...

Hi, I am working on a project that needs some rotation around a central axis. I was looking over at some Servos but I don't know how to calculate the torque required by the servo. I was thinking of doing a simple free body diagram, but as I was drawing it I realized the forces are on the Z axis...

I am working on a timelaps project so I need my motor to move very slowley, the motor I am using has a max voltage of 24V and a stall current of 1 Amp The motor I want to use is on this link: http://www.dynamicperception.com/EZ-Swap-DC-Motor-p/dp-dcm.htm This motor will need to lift...

Hi I am trying to work out the torque required to rotate an object from 0 to 1RPM in 1 second (1 second accelerate to 1RMP) , its working in time laps so very small movement is required. The diameter of the gear is 30mm and the diameter of the shaft is 10mm, the object on top weights 20kg...

Does changing the amplitude or width of these pulses do anything? I'm trying to figure out how to increase a motors speed! Thanks in advance!

Specifically, this is all to do with rotor size of brushless DC motors and how it plays a part in calculating angular velocity / volts / amps / torque. There is no single equation to be solved here. Any relating information or equations..., any and all, please jump in. I've been looking at all...

Hi! I'm stuck on a very basic problem while trying to design a product. Basically, I need to know how to calculate the gear ratios, pitch, motor specs etc for two rack and pinion mechanisms- one horizontal and one vertical. The pinion moves along the rack in both situations. Mass to be moved-...

Hi All I am asking this question as a mechanical engineer, so please bare this in mind if you have the time to post a reply... I have a basic DIY type cement mixer that has given up today. It is a AC 230V model with the most basic of drive setups (pulley and drive belt attached to the...

Hello, i'm unsure of how to complete the final part of this question; Homework Statement A motor is designed to operate at 118V and draws a current of 12A when it first starts up. At it's normal operating speed, the motor draws a current of 2A. Compute: a) the resistance of the...

I have a 1.5 hp dc motor that I am going to use water power to turn . How much power can I expect from this . It is just a summer fun project .

hi guys! i was wondering if the solid magnet part of a brushed dc motor needs to be strong in order to make a strong motor? I'm designing a motor from scratch and wondering if i should use an existing ferrite magnet that is somewhat strong or should I design a electromagnet that is stronger...

Homework Statement i need to calculate the power used up to carry a vehicle with 433mm diameter wheels,mass of 163kg up a slope of 3%. The horizontal distance of the slope is 2.9km. The surface of the slope is asphalt with rolling resistance of 0.22 From the following motor specs...

Hi, I am making a Simulink model for the drive cycle of a hybrid bus. My bus is using a gas turbine engine to power a generator which then charges the batteries. I have a motor model which I have attached a screenshot of, and I know I can use this as a generator also. I just have no idea...

Hi. Having measured an induction motor on no load and obtained a torque figure, I have noticed that when load is increased, the torque continues to decrease. How it this possible as I am observing a reduction in rotor speed and increase in rotor currents and current drawn from supply?

Hi, Does anyone know or could help me understand the reasoning for the amount of slip within an induction motor decreasing with frequency under the same load conditions? I.e. For no external load, the slip is higher at 50Hz than at 20Hz etc? Thanks

Hi, I am currently simulating a 3 phase induction motor system. One of the tests that I have run is to keep the motor parameters (reactance, resistance etc.) constant, and then change the frequency of the supply (50, 40, 30 Hz etc.) before measuring input parameters (current and power drawn...

Hello everyone, I'm a bit confused about the power drawn by a motor. Since back emf reduces current when the motor is rotating at high speed, is it true that back emf reduces the power required at high speed? THX :D

A 3-phase induction motor in our factory had unequal phase currents. One of the currents was nearly normal while the other two were about twice the usual value. Somebody said that prolonged running causes increase in resistance of stator winding, and this results in increased current. But this...

hi! so I'm in secondary two, and so far in my syllabus we have covered up to work done. now this is my homework, and I'm not sure whether my answer is accurate, could you help me with this? (I haven't learned the equations yet)

I have measured some properties of four sewing machine motors for domestic use. They are all universal motors (series motors) for the public grid voltage in Europe. The four motors are: a) Singer 66K motor. Motor seems to be produced about 1930 in UK. b) Singer 201K motor. Motor seems to be...

Hi, When a load is applied to the rotor of an induction motor, the rotor speed decreases and as a result, the induced currents in the rotor and the torque produced increases due to the relative speed difference between the rotor and the rotating field within the stator. My question is...

Hello guys, i have a problem in determining a thickness of a plate. i have a motor (m = 17 kg) attached to a plate. the design can be seen in the attachment. i need to know the dimension of "t".

Can someone give me tips? I want to know the gravity effects on the electric motor's rpm. Is there or not? If there is effects on electric motor, how would it differ?

Hi, I'm new here and had a question relating to my senior design project in mechanical engineering. My project ends up involving a small DC electric motor, which needs to be able to be reversed and it would be nice to be able to have some speed variability. I'm aware of speed controllers and I...

Hi, I have a single phase ac motor system currently working at 2980rpm, 5.6 amp, 50 hz, 240v, efficiency 87% giving approx 1 horse power. Can I have a similar powered dc motor run off a 12 volt car battery. Can this be achieved inexpensively? Could I use an inverter for original system...

I'm looking for a DC Motor to power a small 50lb robotic platform with maximum speed of 10mi/hr. What should I be looking for? I've made some basic assumptions of 8" or 12" diameter wheels and so the rpm rating should 420 rpm and 300rpm respectively to attain 10mph. I plan to use at least two...

Homework Statement The coil of a DC motor has a resistance of 2.0 ohms. The motor is runned by a battery of 12 V and an internal resistance of 0.5 ohms. a) Calculate the current at the moment the motor is started b) Calculate the current when the motor is running at 600 RPM , when there is...

I have built a conveyor system but still need to power it. It is not a conveyor belt, but rather a trolley of sorts for moving materials up to the second floor. It runs parallel to stairs for about 17 or 18 feet in my garage at an angle of apx 38°. It needs to be able to move at least 500 lbs...

Homework Statement This crane lifts a 125 kg heavey motor. What is the member forces of BF and BD? Use 10 m/s^2 as accleration of gravity. https://dl.dropboxusercontent.com/u/11241083/problemtruss.png Homework Equations F=ma Sum Fx=0 Sum Fy=0 Sum M=0 The Attempt at a...

hey friends i am new to the forum so greetings to all i have a problem and need some help i will brief the problem in two lines: i need a motor to turn a wheel of inertia I, by means of sprockets and chains, the motor should reach 1280 rpm after 6 rounds so the wheel reach a given normal...

I have : Cylinder : 958,000 lbs Motor 200 HP required RPM : 5 time : 60 seconds Torque: 18,757 lbs-ft What to find ? Time required by the motor to reach that torque Doubt : Is there a chart or a graph that gives this value ? is there any eqaution / formula that helps finding...

If in the DC motor specs doc says that it can handle + - 16 Volts maximum and 3A of peak current but the nominal voltage is 6 V and the continuous current is 1A... it means that it is safe if you feed it with 3A during the time of start up? Supposedly it is only meant to be at the start...

HI, please help me... I am thirsty for any insights to my problem. I have a motor: Output: 60W VOLT:12V DC AMP: 7.5A RPM:1800 TORQUE: 3.5kgcm I have a motor reducer: for converting rotation movement of motor to up and down motion(for lifting heavy load) look like this...

I have a Geared DC Motor rated 12V, 0.6A, 180RPM, 3kg.cm, 66% Efficiency. I measured the impedance of the disconnected motor at 45 Ohm. I want to use it with a with a simple 12V 1A DC Power Supply in a Field Current Control Circuit to be able to dial in variable speeds. Will the circuit in...

People of physics forum i have come here to ask for help. i am trying to model a armature controlled dc motor with no load but and opposite force in the form of frictional damping the expression i have raised and am assuming it to be right is ωout/Vin = k/(L(s)+R)(I(s)+C)+ kt.k...

I bought a Savox servo motor (http://www.savoxusa.com/Savox_SB2272MG_Digital_Servo_p/savsb2272mg.htm) I'm planning on using the motor to generate a pitching motion sinusoidally from 0 to 60 degrees back to 0 and so on... Do you guys think this motor is precise enough to generate the...

hey, So I am working on this project where I am trying to come up with a motor set up to drive two wheels of a trolley. The entire trolley weighs 650 kgs and i require a motor with a torque of about 400Nm. I want to set it up in such a way that i want to be able to apply very little force to...

I am looking for a DC Motor with the given specifications: Power: 2HP Torque: 400 Nm Voltage: 12V/24V Current: 120 A Number of Drive Wheels: 2 Diameter of drive wheels: .435m Gear Reduction set up: Worm drive arrangement Total weight being driven: 650kgs Speed at motor: 1500rpm...

Hello Everybody, Can anyone explain, what is thee difference between 'electrical spped' and 'mechanical speed' of rotor in an induction motor? what do they signify? Many literatures say that electrical speed is no of pole pairs times mechanical speed, if somebody can explain... Thanks

Homework Statement in a real time scenario, when we buy a dc geared motor.could we run it as generator ? how much current would a dc geared motor produce when run as generator? could anyone please provide me the equation to find the generated voltage in case the said motor is bought with the...

The link to the motor is here: http://www.savoxusa.com/Savox_SC1256TG_Digital_Servo_p/savsc1256tg.htm In the description tab, it lists all the specs. My question is in regards to the speed specs. e.g., "Speed(@4.8V sec/60): .18" I don't understand what that is saying. 0.18 what? 0.18 sec per...

Is the same torque required at any freq in order to overcome these losses?

I have recently pulled apart two old RC helicopters for their parts and built an RC car out of it. It is pretty basic, and uses the servo motors, motors and the receiver from the helicopter, and I control it with the controller that came with it. It works fine, except for an excessive heat...

Hello I'm doing a question in induction motor now. formula for Induced torque is Pgap / Ws. i have found the Pgap, but in order to find Ws, i need frequency to find ns.. so my question is, how to find frequency with only given 10hp and four pole

Often I'm reading on other sites that if a 2 pole 3600RPm (synchronous speed) motor were connected so that the ratio would lower the speed to the same as a 4 pole (2X) and so on with 6 pole (3x) the output HP will remain the same. However the larger the number of poles the larger the motor and...

I am planning a build on a simple 4-wheel-drive cart for hauling equipment for my business up/down yards with grade. 4 wheel cart will have weight capacity 1500 lb with potential of crossing up to 35 degree slope (slow RPM/high torque/motor brake necesary.) This will implement a 110V AC...

Which equation is correct I have seen both- F=N/60*P Or F=N/120*P This is Frequency, N=RPM P=Poles

Hello all, So I am confused about a a scenario and I hope you guys can hook me up with some explanation. So I am trying to find the initial force needed for an electric motor to turn. I am not looking for torque or energy just the Newtons just to start from scratch and keep going with the...