the 4.7uf 400v capacitor is overheating in the 1.2 hp.90v engine. Is that plausible? Take A Sneak Peak At The Movies Coming Out This Week (8/12) New Movie Releases This Weekend: February 12th – February 14th There was an error updating your shopping cart! 170 V - 101 V = 69 V left over to drive the motor at 3600 RPM. PWM DC Motor Speed Control: Power: Sep 21, 2006: 0: 12 Volt Battery Voltage Monitor (kit available) Power: Jun 18, 2015: 1: Battery Low Voltage Beeper: Power: Sep 21, 2006: 0: 12 Volt 15 Amp Low Voltage Disconnect (kit available) Power: Jun 18, 2015: 0: PWM Motor Speed Controller / DC Light Dimmer: Power: Jul 12, 2001: 0: PWM Motor… I applied 12V to it and it was reading well under an 1 Amp. Typically you this test would be done at ~25% rated current. Measure voltage and current and calculate R = V/I. (max 2 MiB). Check my updated question, I've included a photo of the circuit and the motor. If possible, lock the rotor and then apply a small current to the terminals. Brake NFF40 207 V DC 1m flying lead hand release lever endcover bored 72dia H7 + seal 196-00799 hub spacer hub bored 55dia H7 with 16 x 10 keyway half wave rectifier EGV500-4 supply loose 060-5251 DANFOSS CONTROL NEMA1 … There is a dynamic test, too, that can give even better results - do the same as I just said, but instead of locking the rotor, back drive the motor. Does the motor spin? A motor in idle or at low speed cannot charge the battery sufficiently. Qty: $264.55. At locked rotor, you know that \$V = R*i\$ because \$e=0\$. That is a lot for a 'small' motor, so I suspect that one of your measurements is out by a factor of 10. I don't, however, see the brushes. DC Motors,DC Motors Base Mount,DC Motors Face Mount,DC Fan Motors,Special Purpose DC Motors,Motor Speed Controllers ... 1/3 HP 90 Volt DC 1800 RPM Motor 56C WWE WPMDC13-18-90V-56CB Item Number: 10-2575 4 ... 90/180 Volt DC Non-Rev PMDC Motor Controller WWE WDCCONT Item Number: 11-3304 7 In Stock. Here's a simple PWM based motor speed controller circuit which can be used for controlling a treadmill speed right from zero to maximum. Here is a typical small permanent magnet motor designed for 120VDC:-, Click here to upload your image I went back and read the resistance, but this time I got around 39 ohms. 90v. Most motors can do at least 3600 RPM (60 Hz), so let's see how that works out. To characterize a DC motor you need to find its Kv, Rm, and Io (no-load current). ... connection cables and took a reading on 200AH battery terminals which was 13.17 V and after one hour readings was 12.90V (note there was no load on the battery, as all the cables were removed) after one more hour reading was 12.46V and after 28 hours … Repeat several times and average. FYI, the motor diameter is about 2 inches wide and the height of the motor is about 4 inches. That allows for the first pass guess as to how many Watts it can dissipate. At 5000 RPM, you'd have 140 V back EMF with 30 V left over to drive the motor at 170 V in, which would take 18 W. That could be quite plausible if the motor is at least fist-sized. Les premiers essais (+/- 2A) avec le moteur ne montrent pas de chaleur excessive, mais je ne suis pas encore à l'utilisation maximale de 4 à 5 A. Pour ce qui est de faire un hacheur moi-même, je me demande si cela … The controller is a basic triac/diac speed control with a rectifier at the end. Thanks a lot. Quick View. At that speed, the back EMF would be 101 V according to your measurements. Measure voltage and current and calculate R = V/I. Perhaps, its buried inside. https://electronics.stackexchange.com/questions/132720/how-do-i-find-the-voltage-range-for-an-unknown-dc-motor/132753#132753, https://electronics.stackexchange.com/questions/132720/how-do-i-find-the-voltage-range-for-an-unknown-dc-motor/132726#132726, https://electronics.stackexchange.com/questions/132720/how-do-i-find-the-voltage-range-for-an-unknown-dc-motor/132739#132739. And from that current, \$i\$, you can solve for the locked rotor torque at different voltages: \$T_{lr} = K_t*i = K_t*\frac{V}{R}\$. Resistance can vary on a DC motor due to brush contact. Connect the lines and you have various speed-torque curves at different voltages. Typically you this test would be done at ~25% rated current. I want to build a speed controller for a 90 V … Of course it wouldn't actually ever get that fast because there would be no EMF left to actually drive it, and no torque left to drive anything else. Is there a chart or formula for the voltage vs speed and or voltage vs torque for a DC motor? As somebody else mentioned, the torque constant of a motor is equivalent to the back-emf constant, so \$K_t = 0.268 \frac{Nm}{A}\$. I made the circuit and tested it. This single-phase asynchronous motor speed controller can be used for 24V, 36V, 90V DC motors The controller uses high quality electronic circuit and integrated components for durability It has small size, high precision, wide speed controlling range, low power consumption and long service life If possible, lock the rotor and then apply a small current to the terminals. You may also include a mechanical load of some kind and measure torque, like a dynamometer. Does the massager have a label or nameplate, and if so what does it say (model number, Amps, Watts etc.)? If you think it might be intended to run from rectified 120 V AC, then let's see what 170 V does, since that's what you'd get if there is a capacitor after the rectifier. If you solve for \$i = \frac{V}{R}\$, you can find the current when the rotor is locked at different voltages. I want to find out what is the maximum voltage range for the motor, but it is proving difficult. ... the engine will work with 1.4hp. D&D Motor Systems is the premier go kart electric motor manufacturer in the U.S. for electric go karts.Our electric go kart motors offer higher performance than the pancake motors that are out there. Depending on how critical it is for the motor to work after testing and what equipment you have, you might slowly increase the voltage into it while keeping an eye on temperature, speed, and current. Resistance can vary on a DC motor due to brush contact. It's basically a set of electromagnets that interact with a set of permanent magnets and are mechanically switched at the appropriate times to keep it running in the same direction. You can also provide a link from the web. Are you sure that it was 50Ω and not 500Ω? I have a small unmarked motor with a burned out speed controller board. Repeat several times and average. That's not out of line for a DC motor, not knowing anything else about it. Therefore on 120V it should do about 4300rpm. A simple model for a DC motor is \$V= R*i + e\$, where \$V\$ is the terminal voltage, \$R\$ is the motor resistance, and \$e\$ is the back-emf voltage. The motor resistance is 39 ohms (was reading 50 before). Merci NINA67, J'ai placé le TIP142 et la diode RL sur un radiateur que j'ai fixé dans le boîtier de l'alim. With a resistance of 50Ω the stall current would be 120/50 = 2.4A, so stall torque should be about 0.268*2.4 = 0.643N-m or 91oz-in. How much do you get? If you assume \$i=0\$ when there is no load, that equation becomes \$V=e\$, which becomes \$V= K_b* \omega\$, which becomes \$\omega = \frac{V}{K_b}\$. That would deliver 95 W to the motor, which is a lot unless it's at least maybe 6 inches across. Your measurements give us some idea, but it would be additionally helpful to know the physical size of this motor. Here's a photo of the motor and a snap shot of the circuit: It's mostly about how much power the motor can safely dissipate without getting too hot. And that's only one of many parameters. The point that you're comfortable with is up to you. Please see my updated answer along with a photo. 10A 4000RPM. Assuming that it is a permanent magnet DC motor (and not a synchronous, induction, or 'universal' motor) your generator test indicates that the Kv (velocity constant) is 3.73rad/s/V or 36rpm/Volt. Our electric go kart motor has: higher torque, better thermal capabilities and a competitive price.In addition, we offer a U.S. made go cart speed controller … For a given strength, you can make a high-current, low-voltage electromagnet or a low-current, high-voltage electromagnet. The motor has a plastic worm gear attached to it and was used as a neck massager. That would be the absolute maximum speed. I can see what looks like a brush holder, in the vent at the mount end of the motor. 50 RPM would be sufficient. \$e\$ can be determined from \$e = K_b* \omega\$, where \$K_b\$ is the back-emf constant (units of V/(rad/sec) or V/RPM) and \$\omega\$ is the speed in the same units as \$K_b\$.

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