I have a electric motor and want to slow the speed down. do i reduce the volts or the amps. it is 240v 0.22A. if i reduce the volts to 110v will this do what i want and will it damage the motor or cause it to over heat.
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the speed feed rheostat(control) is shorted or you've got a short on the board if it has one. Hopefully just your switch. Check for a short from the switch to the drive motor. Remember, electricity can and will kill you. Be safe Bryan
If You are wanting to avoid the high price of an official replacement, you can use an exhaust fan motor from an inexpensive exhaust fan from a home center- but you will need to locate a 24 volt transformer of about 1 Amp capacity -24 Volt Amps. These are used in furnaces so one pulled from a scrapped furnace will also save some cash.
It is a matter of locating the transformer out of the way, then clipping the wires that go from the control board to the old fan motor, Locations on the PC board of 12 and 13 and making those connections. Then running the primary leads and the new fan leads together to the AC power coming in. On 220, you are only going from one hot to return, so your nominal votlage for fan and transformer remain at 115 volts. Terminals 11 and 15 on the Control board.
Since the original was a nominal 24 volts, using a discrete transformer may leave you with a faster than expected feed rate you cannot slow down significantly. If that happens,either put resistance in series with the transformer output, 1,2 or 4 Ohms will slow it down some, as will changing the speed control potentiometer itself.
Miller used a 2500 Ohm linear taper potentiometer in most cases. Raisng the resistance to 5000 Ohms will also slow down the feed rate and using a 1000 ohm linear taper potentiometer will speed it up as well.
You can't just run it on the 240 Volt supply. Check the motor nameplate. If it says it is rated for 110/220 or 115/230, or 120/240 Volts, then it is capable of running at 240V. This will require a wiring change, and you may need a larger size power cord.
The electrical diagram should be on the motor name plate or under the cover to the electrical terminals on the motor.
Use only a single-outlet surge suppressor that is UL 1449 listed as a transient voltage surge suppressor (TVSS). The surge suppressor must have a UL suppressed voltage rating of 400 volts or less and a minimum surge dissipation of 450 joules. The surge suppressor must be electrically rated for 120 volts AC and 15 amps. There must be a monitoring light on the surge suppressor to indicate whether it is functioning properly. Failure to use a properly functioning surge suppressor could result in damage to the control system of the treadmill. If the control system is damaged, the walking belt may change speed or stop unexpectedly, which may result in a fall and serious injury.
I'm assuming you have 3 phase electricity, usually for farms or industrial buildings only. It sounds as if you may be out of sequence with you three phases. It may be a power supplier problem. If you are in a house with normal 120 and 240volt electicity then a 480 volt appliance won't work properly.
Motor speed needs to be regulated by PWM. Reducing the current (with a resistor) actually lowers the torque - which, with a given load, does result in reduced speed - however, different length tapes (60min vs 90min), as well as different quality, and even current position in the tape, will change the load and hence the speed.
You need to regulate the speed via PWM. It's sometimes done on a small board built into the motor, in which case you'd have a round hole into which you could insert an INSULATED screwdriver (tiny flathead wrapped most of the way in electrical tape works).
It may be done on the main board, in which case you could find a pot conveniently labeled "motor speed", or perhaps "pulse width" or "pwm" or something to that effect. Find it, mark its current position just in case, and turn it to see if it gets the effect you're after.
And there are some tape decks in the world with no speed adjust - they are designed with a specific speed motor and the sizes of the wheels and gears are calculated for that speed.
Also there may be a mechanical fault/malfunction causing the speed problem.
An initial check and thorough cleaning of the capstan and pinch roller should be done. If there is a buildup of tape oxide or a piece of a broken tape wrapped around the capstan, the tape travel will be too fast (do to the effective increase in capstan shaft diameter).
If the pinch roller isn't fully engaging, the tape can be getting pulled onto the takeup spool at a speed faster than the capstan control.
A different source of trouble might be a slip clutch (possibly an
idler/clutch assembly)which is binding, or otherwise not functioning the way it should.
Another type of motor doesn't have it's speed controlled by an internal or external voltage.. instead, the motor has an internal centrifugal speed controller. This type of motor can be found on older tape decks, and might not have been utilized more recently.
Good luck
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