Resistance can vary on a DC motor due to brush contact. sur la carcasse. Resistance can vary on a DC motor due to brush contact. There are a lot of assumptions in what I wrote above. 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. Repeat several times and average. 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There's no transformer so I guess it's probably operating at full 120V. 50 RPM would be sufficient. Measure voltage and current and calculate R = V/I. Repeat several times and average. Once you have the stall torque at different voltages and the maximum speed at different voltages, you can plot them on a graph with speed on one axis and torque on the other axis. The motor resistance is 39 ohms (was reading 50 before). I went back and read the resistance but this time I got around 39 ohms. Typically you this test would be done at ~25% rated current. the 4.7uf 400v capacitor is overheating in the 1.2 hp.90v engine. The 2 main assumptions you should be aware of are 1) that the motor stays relatively cool (so the resistance doesn't change) and 2) that the no-load current is zero (in reality it won't be). 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. I went back and read the resistance, but this time I got around 39 ohms. FYI, the motor diameter is about 2 inches wide and the height of the motor is about 4 inches. Perhaps, its buried inside. Click to see our best Video content. 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}\$. 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. If you solve for \$i = \frac{V}{R}\$, you can find the current when the rotor is locked at different voltages. 170 V - 101 V = 69 V left over to drive the motor at 3600 RPM. My guess is that it needs to operate at high torque. I can see what looks like a brush holder, in the vent at the mount end of the motor. If possible, lock the rotor and then apply a small current to the terminals. Here's a simple PWM based motor speed controller circuit which can be used for controlling a treadmill speed right from zero to maximum. How do I find the voltage range for an unknown DC motor. Most motors can do at least 3600 RPM (60 Hz), so let's see how that works out. 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 … Does the motor spin? Thanks. 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. I don't, however, see the brushes. ... the engine will work with 1.4hp. If possible, lock the rotor and then apply a small current to the terminals. Does the massager have a label or nameplate, and if so what does it say (model number, Amps, Watts etc.)? There's no name plate and there's a number but it's meaningless. 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 … Measure voltage and current and calculate R = V/I. The motor has a plastic worm gear attached to it and was used as a neck massager. The best way to measure resistance is to take several measurements and average. 10A 4000RPM. ©Copyright 2021 Surplus Center, All Rights Reserved. A motor in idle or at low speed cannot charge the battery sufficiently. \$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\$. 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. The motor looks awefully similar to my motor. There's also a bunch of resistors and capacitors which is probably uses for PWM. 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. Connect the lines and you have various speed-torque curves at different voltages. Merci NINA67, J'ai placé le TIP142 et la diode RL sur un radiateur que j'ai fixé dans le boîtier de l'alim. There's writing that says made in China. Typically you this test would be done at ~25% rated current. The motor has a plastic worm gear attached to it and was used as a neck massager. 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 want to find out what is the maximum voltage range for the motor, but it is proving difficult. For a PMDC motor, Kt (torque constant) is the inverse of Kv. Quick View. To characterize a DC motor you need to find its Kv, Rm, and Io (no-load current). At locked rotor, you know that \$V = R*i\$ because \$e=0\$. For the back EMF to be 170 V would require 6000 RPM (100 Hz). Please refresh the page and try again! 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 board appears to have a triac and perhaps a diac or some diode. For a given strength, you can make a high-current, low-voltage electromagnet or a low-current, high-voltage electromagnet. That is a lot for a 'small' motor, so I suspect that one of your measurements is out by a factor of 10. That would deliver 95 W to the motor, which is a lot unless it's at least maybe 6 inches across. 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 How much do you get? Hook the motor across a 12V car battery and measure the current draw (multimeter on 10~20A range). You can also provide a link from the web. 90v. 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. Please see my updated answer along with a photo. I have a small unmarked motor with a burned out speed controller board. Therefore on 120V it should do about 4300rpm. Qty: $264.55. At that speed, the back EMF would be 101 V according to your measurements. Motor Hall - JST-SM: The hall plug is a 5 pin female JST connector using the same pinout standard we adopted since 2008. Take A Sneak Peak At The Movies Coming Out This Week (8/12) New Movie Releases This Weekend: February 12th – February 14th Let's look at it another way. Motor Phase - MT60: The 3 motor phases are terminated with a male MT60 bullet connector.This compact plug supports high phase amperages in a very small connector size.