Wiring for 230 volts electric motor for RUDD furnace

Started by sokkia58 in sci.electronics.basics11 years ago 8 replies

The motor on my commerical furnace (heat+air) went bad. I took the motor out. The existing motor was an Emerson motor, 3/4HP,1075...

The motor on my commerical furnace (heat+air) went bad. I took the motor out. The existing motor was an Emerson motor, 3/4HP,1075 rpm,6.3 amps,230volts with no capacitor. The existing motor is a 2 speed motor. The motor had 4 wires (brown,black,red,orange). All these wires were directly connected to same color wires from the furnace controls. I bought the replacement motor with same specifi...


A couple more motor control questions - Braking

Started by Echinos in sci.electronics.basics10 years ago 12 replies

I've been doing some research about braking a DC motor. I am building an electric model train, and I will definitely need some sort of brake or...

I've been doing some research about braking a DC motor. I am building an electric model train, and I will definitely need some sort of brake or speed limiter (or both ;). I've read that shorting the motor, or opening both of the high or low sides of an h-bridge driving the motor, will cause the motor to "work against itself" and slow it down. I understand that, but in my situation, the mot...


PWM A Dc Motor W/Seperate Supply

Started by Chris in sci.electronics.basics11 years ago 8 replies

Hi, I'm using a pic a npn resistor and diode to drive a small dc motor, everything works fine if i feed the motor the same + supply as the pic...

Hi, I'm using a pic a npn resistor and diode to drive a small dc motor, everything works fine if i feed the motor the same + supply as the pic but when i change the + supply for the motor it's always on, all the ground is the same basically i want to power the motor before my 7905...


Stepper motor question

Started by vorange in sci.electronics.basics10 years ago 6 replies

1) I have a stepper motor in mind : http://tinyurl.com/2qr4d9 I'm guessing since it has 6 wires that it has 2 coils. But should that not...

1) I have a stepper motor in mind : http://tinyurl.com/2qr4d9 I'm guessing since it has 6 wires that it has 2 coils. But should that not mean it has 4 phases. Why do they list it as a "2 phase stepper motor"? 2) The motor above is listed as a "bipolar (in series) and unipolar" as well which is kind of confusing. Is it possible to drive it as a bipolar motor (i.e. without using the ...


Help Trying to Use D.C. Motor as Generator

Started by Techmann in sci.electronics.basics9 years ago 16 replies

I have a D.C. motor that spins just fine when I apply 12V to it. The motor has a 1/4" shaft and I would like to use it as a generator. When I...

I have a D.C. motor that spins just fine when I apply 12V to it. The motor has a 1/4" shaft and I would like to use it as a generator. When I hook up a DC voltmeter to the leads and spin the shaft in the same direction with my electric drill (around 1000 RPM) the most I see out of the motor is only .24 volts. I am puzzled why I am not seeing close to 12V output on this motor. Can only cer...


Determine speed of DC motor

Started by Anonymous in sci.electronics.basics9 years ago 17 replies

I have a DC motor with the following specifications: RPM @ 0 Torque: 3500 Stall Torque : 0.01 Nm V_ss : 8V Background information: The...

I have a DC motor with the following specifications: RPM @ 0 Torque: 3500 Stall Torque : 0.01 Nm V_ss : 8V Background information: The motor will be used to drive a miniature monorail in a Tug-of-War type competition. Goal: Since this is the only motor I can use, I want to ensure it is running at it's maximum power. How do I determine what speed the motor will actually rotate at? ...


-- Magnetic motor 1, the static magnetic field 1) Motor

Started by Anonymous in sci.electronics.basics11 years ago 4 replies

-- Magnetic motor 1, the static magnetic field 1) Motor, Edison is a classic -- for the motor commutator. It gave birth to a commutator ...

-- Magnetic motor 1, the static magnetic field 1) Motor, Edison is a classic -- for the motor commutator. It gave birth to a commutator Early glory and pride of Health also has its challenges by the AC motor sad and helpless. (By his own mistakes, for To the trouble : Brush Powder, for to sparks and fire the ball, did not attain a high voltage DC not lock. ) 2) unipolar machine (...


Looking for some ideas for DC motor control

Started by Eric R Snow in sci.electronics.basics11 years ago 3 replies

Greetings All, I'm working on a device to pull wire for welding. The mechanical part is done and now I'm trying to figure out how to do the...

Greetings All, I'm working on a device to pull wire for welding. The mechanical part is done and now I'm trying to figure out how to do the motor speed control. I thought that a PWM speed control would be best because the motor torque will be close to constant. However, there are only two wires available to turn on the welder, power the motor and turn the motor on. this is because there two ...


What range should my POT be?

Started by kayvee in sci.electronics.basics9 years ago 23 replies

Okay, so I have this motor and it is powered by a 24VDC power supply, and I would like to vary the voltage going to this motor. This motor draws...

Okay, so I have this motor and it is powered by a 24VDC power supply, and I would like to vary the voltage going to this motor. This motor draws 0.4A with 24V. I understand that connecting a pot normally to this motor will burn out the pot rather quickly, so one must use a NPN transistor. I reckon in this fashion: V+ ---+---------------+ | | P /c ...


1 -- Motor magnetic field, static magnetic field 1) motor

Started by Anonymous in sci.electronics.basics11 years ago 4 replies

1 -- Motor magnetic field, static magnetic field 1) motor, a commutator Edison classics -- for the motor.Commutator is the beginning of...

1 -- Motor magnetic field, static magnetic field 1) motor, a commutator Edison classics -- for the motor.Commutator is the beginning of glory and pride of its birth, has its challenges by the AC motor sad and helpless.(By his own shortcomings, for the trouble to : Brush Powder, for sparks to the ball of fire, achieved high voltage,DC not lock. ) 2) unipolar machine (single-pole, low volta...


ac induction motor speed control problem

Started by mike theodore in sci.electronics.basics10 years ago 2 replies

Hi I'm experimenting with a single phase ac 220V ac induction motor. I want to regulate speed and for this i'm using a triac together with an...

Hi I'm experimenting with a single phase ac 220V ac induction motor. I want to regulate speed and for this i'm using a triac together with an optocoupler to drive it. I'm using PWM to control firing angle and hence the speed of the motor . I see two strange things as speed is reduced 1. Motor overheats. Is this normal ? 2. I hear a buzzing sound coming from the motor .From what is it? ...


Extend length of DC motor wires?

Started by John Doe in sci.electronics.basics7 years ago 14 replies

An 18 V cordless drill motor. Can the wire be extended to about 3 feet from the battery to the controller and from the controller back to the...

An 18 V cordless drill motor. Can the wire be extended to about 3 feet from the battery to the controller and from the controller back to the motor without degrading motor performance? Would larger (or smaller) diameter wire make any positive difference? Thanks.


BLDC motor questions

Started by Anonymous in sci.electronics.basics9 months ago 19 replies

Awright youse motor folks, I need info. I have, over the last couple years goofed around with BLDC motors made for RC hobbies. I even made a...

Awright youse motor folks, I need info. I have, over the last couple years goofed around with BLDC motors made for RC hobbies. I even made a couple just to learn winding techniques. The motors are rated in part by the kv of the motor, which is how fast it will spin when powered at a given voltage. The kv stands for thousand revolutions per volt. A hand wound motor, or any motor for that matte...


Need help wiring a breadmaker motor.

Started by Anonymous in sci.electronics.basics11 years ago 7 replies

I have a reversable motor removed from an Oster breadmaker. I want to use it on a project because the motor runs very quiet. The motor is a 60Hz...

I have a reversable motor removed from an Oster breadmaker. I want to use it on a project because the motor runs very quiet. The motor is a 60Hz 120V motor that has three wire. Red, white and blue. The white wire goes to nuetral on the AC outlet. The other two wires goes to a circuit which has two transistors, capacitors and more. When I measure these two wires they show 120V AC (forward spin...


Measuring torque

Started by lerameur in sci.electronics.basics11 years ago 4 replies

Hello, I have a small DC motor. i want to measure the torque. NO datasheet of any kind. I used 15lbs (6.8Kg) weight attached to 1.1 cm of the...

Hello, I have a small DC motor. i want to measure the torque. NO datasheet of any kind. I used 15lbs (6.8Kg) weight attached to 1.1 cm of the shaft (motor geared at 1/720 so it turns about 8 rpm). Can we say that the motor has a torque of at least 7.48Kg/cm ? The torque is as high as the motor can rotate at the specific voltage? in my case 12v. Ken


What passes as Pulse Width Modulation in DC Motor Control?

Started by Rich in sci.electronics.basics9 years ago 70 replies

Can anyone please tell me what passes as PWM in Motor Control? Is it limited to supplying the motor with a square wave, where a set...

Can anyone please tell me what passes as PWM in Motor Control? Is it limited to supplying the motor with a square wave, where a set and constant level of voltage is switched on or off to the motor? Or can other waveforms consitutute PWM control of a dc motor? Such as where voltage does not drop to zero, but has periodic peaks having square, triangular, sawtooth or some other waveform? ...


Can all DC motors be reversed?

Started by John Doe in sci.electronics.basics10 years ago 9 replies

Can all DC motor leads be reversed so the motor runs in the other direction equally well? I have a 36 V DeWalt cordless drill motor that...

Can all DC motor leads be reversed so the motor runs in the other direction equally well? I have a 36 V DeWalt cordless drill motor that has a casing with a molded plus sign on it. Clearly they very much want the positive motor speed control lead to be attached at that terminal. But maybe that plus sign is just so that the worker will connect the wire to the right terminal so that ...


Stepper motor controller help please

Started by Anonymous in sci.electronics.basics5 years ago 7 replies

I recently acquired a programmable stepper motor controller. It was made by Richmill Manufacturing Company Ltd. around 1982. It is designed to...

I recently acquired a programmable stepper motor controller. It was made by Richmill Manufacturing Company Ltd. around 1982. It is designed to drive a unipolar stepper motor. The guy I got it from said it worked fine when he put it away and then upon trying it about a year later it only works intermittently. I did discover one wire in the cable that goes to the motor does not have continui...


how to turn a universal motor into a generator

Started by gearhead in sci.electronics.basics10 years ago 4 replies

I took apart an old vacuum cleaner with 12 amp motor, made for U.S. 60 Hz AC household use so I could experiment with turning the...

I took apart an old vacuum cleaner with 12 amp motor, made for U.S. 60 Hz AC household use so I could experiment with turning the universal motor into a generator. I know it's a universal motor because applying 12 volts from a battery will get the motor to turn, same direction regardless of battery polarity. I wanted to experiment with it as a generator, so I used an electric hand drill to ...


DC motor to microcontroller electrical problems

Started by joshc in sci.electronics.basics11 years ago 9 replies

Hi, I'm trying to get a closed loop motor controller running using a Freescale PowerPC MPC5554 microcontroller and a brushless DC motor....

Hi, I'm trying to get a closed loop motor controller running using a Freescale PowerPC MPC5554 microcontroller and a brushless DC motor. The motor has 2 quadrature encoder outputs that I am reading with my microcontroller to determine speed and direction. The problem I am running into is that when I wire everything up, and with the evaluation board not connected to power, as soon as I turn...