Where to find motor replacement? - Page 1
Forum section: electronics / projects

author: eTimesV
author_rank: Contributor
timestamp: February 22, 2024, 11:01:35 pm
content: I picked up a small, used Inland DB-100 diamond-bladed bandsaw to cut glass for ~$20. The motor unfortunately overheated and literally blew up with a poof and puff of smoke. The replacement motor seems extraordinarily expensive ($130) for what it is and in any case out of my budget:https://inlandcraft.com/products/band-saw-motor?variant=31631567126641Can anyone suggest where I might find a suitable replacement? There is a small custom motor controller board inside, not sure how big a role that plays in finding a 100% exact match motor.It has brushes (see pic) but says 240AC on the name plate so I guess it's an AC and not a DC motor?I would think I should be able to find a little motor like this for maybe $20-30.Looks like the shaft is 8mm and sticks out ~23.5mm. Motor diameter ~76mm, length 107.5mm.Name plate on motor:Model IPPM9801-240Volts 240ACRPM 3000Amps 0.5Torque 0.213NmNo. 32CY990502-265Made in ChinaGoogling "IPPM9801 motor" didn't turn up much. If I do an image search there's nothing at all, a completely empty Google results page. I tried variations thereof like with/without "-240". Also no luck searching on Alibaba or Aliexpress. Also searched IPPM9501 and IPPM9301 (two possible variations when you look at the image of the name plate where one digit is overwritten by hand) and adding the search hint "motor" or not, nada. I also tried searching based on the specs and didn't find much. It's a little strange to come up so empty. This comes close in some respectshttps://leisonmotor.en.made-in-china.com/product/sXAQqBSKSjUM/China-Small-PMDC-High-Speed-Zyt-DC-Motor-78mm-Dia-with-8mm-Shaft.htmlbut is too small and I'm not sure if it works with 240VAC and anyway I've never been able to order from Alibaba without being asked to pay $70-100 shipping.So, I thought I'd ask for advice here.

author: DTJ
author_rank: Super Contributor
timestamp: February 23, 2024, 01:23:56 pm
content: Not a direct replacement but looking at that motor I'd consider replacing it with a treadmill motor and controller.I often see them either thrown out on the verge or being given away on facebook.An added advantage would be variable speed.

author: eTimesV
author_rank: Contributor
timestamp: February 23, 2024, 05:09:13 pm
content: Thanks for the suggestion. I rarely see those being sold or disposed of where I am but I was thinking if I really can't find the equivalent to maybe try something likehttps://www.aliexpress.com/item/1005006358641757.htmlbut now that I look I see shipping makes that too expensive too, and I'd have to ditch the existing housing and design/print something new which I'd rather avoid if I can.The existing motor is variable speed, at least with the attached controller/pot.

author: eTimesV
author_rank: Contributor
timestamp: February 27, 2024, 10:31:25 pm
content: Given the lack of replies I feel like maybe I'm posting in the wrong forum. Anyone know of a better one? I can think of one, practicalmachinist, which I will try next but any other suggestions?

author: Benta
author_rank: Super Contributor
timestamp: February 27, 2024, 10:52:23 pm
content: Quote from: eTimesV on February 27, 2024, 10:31:25 pmI think it's more astonishment over "cheepness" here.You made a steal with 20 Euro bandsaw, and now you're complaining about a 130 Euro motor? If it's that bad, throw the whole thing in the trash.Concerning Practical Machinist: forget it. Anything China and you're out faster than you came in.

author: mikerj
author_rank: Super Contributor
timestamp: February 27, 2024, 11:05:35 pm
content: It's a DC motor since it has permanent magnet fields, applying AC to this would just make it hum loudly and start smoking after some time.

author: temperance
author_rank: Super Contributor
timestamp: February 27, 2024, 11:31:53 pm
content: From the looks of it seems something on the PCB went up in smoke and the motor itself might be fine.

author: eTimesV
author_rank: Contributor
timestamp: February 29, 2024, 10:07:20 am
content: Quote from: Benta on February 27, 2024, 10:52:23 pmthanks for the reply. Although the $20 was quite within my budget $130 is less so.Sorry for not having more disposable income.

author: coppercone2
author_rank: Super Contributor
timestamp: February 29, 2024, 10:11:04 am
content: it might be sealed against dust and stuff its a dirty activity aka expesnive

author: eTimesV
author_rank: Contributor
timestamp: February 29, 2024, 10:11:56 am
content: Quote from: temperance on February 27, 2024, 11:31:53 pmI forgot to add the pic but although there could be something wrong on the PCB too, the motor definitely has a problem. This came out of the motor:

author: eTimesV
author_rank: Contributor
timestamp: February 29, 2024, 10:19:20 am
content: Quote from: mikerj on February 27, 2024, 11:05:35 pmThe motor is labelled "VOLTS 240AC" and, although I'm for sure not certain, the PCB doesn't really look like it is converting AC to DC. Still, the brushes are confusing since normally you'd expect then it's a DC motor. I guess maybe it's one of thesehttps://en.wikipedia.org/wiki/Universal_motor

author: eTimesV
author_rank: Contributor
timestamp: February 29, 2024, 10:23:49 am
content: Quote from: coppercone2 on February 29, 2024, 10:11:04 amThat would make sense but having taken it apart I don't see much along those lines compared to other motors I've taken apart. I suppose there could be something else special about it though.

author: Zero999
author_rank: Super Contributor
timestamp: February 29, 2024, 10:48:59 am
content: Quote from: eTimesV on February 29, 2024, 10:19:20 amDoes it have field coils or permanent magnets? Going by the picture it appears to have permanent magnets, so is a DC motor.Quote from: eTimesV on February 29, 2024, 10:11:56 amThat's insulation from the windings.My advice is scrap it, if you can get a cheaper one, than the price of a motor and parts for the controller, otherwise it still might be worth repairing.I suspect the controller is also faulty. The fact it doesn't appear to be burned doesn't mean it works.It's possible the controller caused the motor to blow up, although I would suspect it's the other way round.Going by the photograph, the controller appears to be a phase controller. There will be four didoes (either discrete components or a bridge rectifier module), which converts the AC to DC for the motor, a thyristor (the three legged component), a DIAC (the blue cylinder) and a few resistors and capacitors. The TRIAC is the most likely component to fail, followed by the rectifier diodes.

author: eTimesV
author_rank: Contributor
timestamp: February 29, 2024, 03:02:58 pm
content: Quote from: Zero999 on February 29, 2024, 10:48:59 amI should have been more specific about the overheating in my original post....I was cutting a 22.5cm circle out of a 17.6mm thick piece of plate glass for a telescope mirror blank.The saw manual didn't recommend cutting thick glass but didn't say why and I thought if I did it carefully it could work. It actually worked really well, I went very slowly, lubricated the cut with a lot of water, but, 28min. into cutting the circle out the motor overheated and blew. I know, 28min., loading a small motor like that, should've been obvious it's too much...well, hindsight's 20/20 and I was so absorbed in watching and guiding the cut I didn't notice the time. If I replace the motor I will add a thermal cutoff switch attached to the motor body and a temperature sensor so I can see how it's getting as I cut.The motor was nuclear hot when I pulled it out. Even close to an hour later it was still 56°C, see thermal pic.The saw's normally $460 (https://inlandcraft.com/products/db-100-band-saw-with-diamond-blade?variant=31631547596913230V version) so I'm going to continue to try to find an alternative replacement motor or eventually I might just buy the official motor if I can manage it. I have a 750W ac motor with VFD that I could cobble onto the bandsaw drive mechanism which for sure will never overheat, but it's not ideal and I suspect it would just keep snapping blades rather than how it is now that the motor bogs down first during a slightly heavy cut, rather than the blade snaps.

author: Zero999
author_rank: Super Contributor
timestamp: February 29, 2024, 03:34:21 pm
content: It's still possible the controller is destroyed. Overloading the motor will increase the current draw, which might be too much for the controller.Another motor and a VFD is a good idea. A decent VFD will enable you to limit the current, thus torque, which should prevent it from snapping the blade.

author: pienari
author_rank: Regular Contributor
timestamp: March 01, 2024, 07:37:13 am
content: Why you just chance real ac motor.Control with Variable Frequency Drive Inverter ?.

author: eTimesV
author_rank: Contributor
timestamp: March 01, 2024, 11:55:42 am
content: Quote from: pienari on March 01, 2024, 07:37:13 amSorry, I don't understand what you're asking.

author: najrao
author_rank: Regular Contributor
timestamp: May 25, 2024, 07:53:10 am
content: Sudden death of posting does not amuse me. There should be a logical end!It is essentially a dc motor, a bridge rectifier hidesbehindthe brush board. I see the poorly made solder connections in a picture. The speed setting is just a triac in phase control, no rectifier here.You should check if the armature is blown, by dismantling the motor further. Even 150C for a few minutes should not kill it. The debris pictured may not have come from it. Some extraneous matter got into the motor somehow, or had been lurking inside all along, waiting to snag the rotor and be shredded.Given a working armature, I would repair the motor. Replacing it may not be justified.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: May 26, 2024, 10:08:06 am
content: I fully agree with mikerj. It is a DC motor. You can see the ceramic magnets on one of the photographs. It does not matter what text they print on the thing. That text is probably for the whole machine, including the speed controller.Such motors tend to be quite bad in quality. A brother of mine once bought a small milling machine with a similar motor. He had twice motors overheat and blow up (near the carbon brushes) and replaced under warranty before he had a motor that did not overheat with normal loads.You're not going to get a cheap replacement part that fits directly, except with a whole lot of luck. You could attempt to frankenstein some other motor onto it. The chance to getting that to work is mostly dependent on the motor you find and your own skill.

author: coppercone2
author_rank: Super Contributor
timestamp: May 26, 2024, 10:19:24 am
content: aliexpress served me well for a pump but it required about 2 pages of discussion and also I ended up getting something that I had to fix (with agreement of the seller). Went through about 20 cities in china to get here.the chinese can get your small electromechanical device... but it s real work for both parties lolotherwise it would have a franken chassis with a way too big pump with custom circuitry installed

author: eTimesV
author_rank: Contributor
timestamp: June 06, 2024, 09:52:10 pm
content: It seems like this brushed motor could work, either the 120W or 150W version:https://www.aliexpress.com/item/1005005544386543.htmlAbout $41.I'd just need an external 12 or 24V supply. I could add a PWM controller, externally if not enough space internally, for speed control.

author: LaserSteve
author_rank: Super Contributor
timestamp: June 07, 2024, 02:10:45 am
content: That looks remarkably looks like a 7x10 mini lathe or Sherline lathe motor in form factor.Steve

author: hneve
author_rank: Regular Contributor
timestamp: June 07, 2024, 12:11:04 pm
content: It sounds like you're in a bit of a pickle with your bandsaw motor. Finding a suitable replacement can be tricky, especially if the original model is hard to come by. Have you considered checking out local hardware or electronics stores? Sometimes they have generic motors that could work, and you might be able to find something within your budget. Another option could be to look for used motors online, like on eBay or local classified ads. Sometimes you can find a good deal on a compatible motor that way.