Motordoc Diagnoses Drivetrains From the Ground

Howard Penrose of MotorDoc joins to discuss the circulating currents killing main bearings and drivetrain checks without a climb. Reach out at [email protected] or on LinkedIn. The Uptime Wind Energy Podcast is brought to you by Weather Guard Lightning Tech, creators of the StrikeTape Ultra LPS retrofit. Subscribe to Uptime's Substack newsletter. And check out Rosemary's "Engineering with Rosie" Youtube channel. Have a question we can answer on the show? Email us! Welcome to Uptime Spotlight, shining light on wind energy's brightest innovators. This is the progress powering tomorrow. Allen Hall: Howard, welcome back to the program.  Howard Penrose: Hey, thanks for having me.  Allen Hall: It's about time everybody realizes what motorDoc can do. There's so much technology, and I've been watching- Yeah ... your Chaos and Caffeine podcast on Saturday morning, which are full of really, really good information about the motorDoc as a company, all the things you're doing out in the field, and how you're solving real-world problems, not imaginary ones- Yeah real-world problems. Oh, yeah. Yeah, and  Howard Penrose: whatever annoys me that week. Exactly. And, and whatever great coffee I'm trying out. Yes. Except for a few. We've had the ReliaSquatch down our- Yes ... um, a couple of times. Uh, yeah, no, I, I enjoy it, and we gotta get you on there sometime. I don't do- I, it- ... a lot of interviews other than an AI character we put in. Allen Hall: It's a very interesting show because you're [00:01:00] getting a little bit of comedy and humor and s- Yeah ... and a, and a coffee review, which is very helpful because I've tried some of the coffees that you have reviewed, that you've given the thumbs up to. But if you're operating wind turbines and you're trying to understand what's happening on the drivetrain side, on the generator, everything out to the blades even, main bearings, gearboxes- Yeah all those rotating heavy, expensive parts, there's a lot of ways to diagnose them-  Howard Penrose: Yes ...  Allen Hall: that are sort of like we can look at a gear, we can look at a joint, we can look at roller bearings, whatever, but motorDoc has a way to quickly diagnose all of that chain in about- Yeah ... 15 seconds.  Howard Penrose: Well, a little longer than 15 sec- more like a minute. A minute, okay. It feels like paint drying. But- Uh, in any case, yeah. Uh, uh, and, and what's kind of funny is, um, back in the '90s, uh, EPRI actually accidentally steered the technology away from its [00:02:00] core purpose, which was in 1985, um, NAVSEA, the US Navy, had done research on using current signature analysis for looking at pumps, fans, and compressors, the bearings, the belts, the components, all the rotating components using the motor as the sensor. Not too much different than we are now. I mean, mind you, we got better resolution now, we've got, uh, more powerful-- I mean, I look at my data from the '90s, and now it's completely different. Um, and then Oak Ridge National Lab, same thing, bearings and gears in motor-operated valves. So in 2003, we were the first ones to apply electrical and current signature analysis to some wind turbines in the Mojave Desert. Wow. Yeah. So, um, nobody had tried it before. Everybody said it couldn't be done. And, uh, that was a bad thing to say to me because- ... it meant I was gonna get it [00:03:00] done. Right. At that time, um, we were looking at bearing issues and some blatant conditions with the, um, with the, uh, generator using a technology called Altest, 'cause I was with Altest at the time. And, uh, I had taken an EMPath software and blended it with a, a power analyzer, and they still have that tool to this day. I was using that technology all the way through 2015. 2016, I should say. And then- And then switched over to the pure EMPath, which was more of an engineering tool. And then more recently, in 2022, uh, made the decision to ha- to take all the work we'd done on over 6,000 turbines, uh, looking at how we were looking at the data and what we were doing on the industrial side, and took a, uh, created a current signature analyzer that would do one phase of current to analyze the entire powertrain. Allen Hall: So when you tell [00:04:00] operators you can do this magic, I think a lotta times they gotta go, " Howard Penrose: What?" Oh, yeah, yeah. They don't understand it because they're used to vibration- Right ... which is a point analysis system. Right.  Allen Hall: Vibration at this- Yeah ... particular location. Yeah. One spot- Even if it's- ... or a couple  Howard Penrose: spots triax, they're reading through material, up through a transducer. Hopefully, they put it above the bearing and not in the middle of the machine like everybody is now, because everybody's trying to sell a sensor. Right. True. They're not selling a- they're not selling accuracy. They're just selling sensors. Right. So, um- Yeah ... you know, uh, I, I'll, I'll even talk about one of the companies here. We've got Onyx here, and they do it right. I mean, they've been doing it right pretty well because we've been doing some of the same towers they're on, and we can match the data they're getting. Oh, good. Right? Yeah. Uh, so but they get it in multiple spots, and there's areas they can't quite reach, so we'll detect those areas as well. So it's a good melding of two technologies.  Allen Hall: Oh, sure. Sure,  Howard Penrose: sure. You know what I mean? Yeah, yeah, yeah. So when you have electrical signature and you have vibration, but in [00:05:00] cases if you don't have vibration, we're a direct replacement.  Allen Hall: Because the generator- I  Howard Penrose: dare say that.  Allen Hall: Yeah. Whichever--  Howard Penrose: I dare say that, um, with- Well, the  Allen Hall: generator is acting as the sensor. Howard Penrose: The air gap. The air gap in the generator s- specifically, yes. Yeah. Generator, motor, transformer. Right.  Allen Hall: Yeah. So any of those- Mm-hmm ... you can clamp onto, look at the current that's on there. Everything that's happening on the drivetrain, in the gearbox, out on the rotor- Yep ... main bearings, all of that creates vibration. Creates a torque. T- a, a torque. Yeah. Yes, more exactly a torque. Yeah. And that's seen in the generator, in the current coming out of the generator. Yes. So those signals, although minute, are still there. Yes. So if you clamp onto that current coming out of the generator, you'll see the typical AC sine wave sitting there. But on top of that- Is all the information about how that drivetrain is doing  Howard Penrose: Absolutely, and everything else. Anything electrical comes through [00:06:00] that. So what you do is just like vibration, you do a spectral analysis. So every component has a frequency associated with it, just like vibration. It's, as a matter of fact, I, I keep having to try to explain to people electrical and current signature analysis is no different than vibration analysis. It's the same concept. We use the same tools. The signature looks just a little different. It's a little noisier, um, but you need that noise in order to see everything. But we have a time waveform, and instead of, um, inches per second or millimeters per second, whatever, you know, uh, velocity, acceleration, and displacement, uh, what we end up with is decibels is the optimal method. You can look at straight voltage signatures at those points or, or current signatures, but the values are so small that you have to look at it from a logarithmic standpoint. Right. There are some benefits to it versus vibration, and there's some things that aren't as good as vibration. [00:07:00] So, you know, we, we do... You have to... Any technology is gonna have their strengths and weaknesses. Sure. So we will see everything all at once. Load doesn't matter. Right. Speed doesn't matter. It's... Only reason speed matters is the location of the frequencies. Uh, so the higher the resolution, meaning the longer you take data, the less chance you have on a lightly lo- loaded machine of blending the peaks together. Right. Um, on the flip side, if I have two bearings turning at the exact same speed, I couldn't tell you which one it is. Because they're the same. Right.  Allen Hall: And the mechanical features of that bearing is w- what creates the signal that you're measuring. Exactly. So if a bearing has five rollers versus 10, just imaginary thing. Yeah, yeah. Five rollers versus 10 has a different electrical signature, so you can determine, like, that bearing, that 10 roller bearing- Yes ... has the problem, the five is fine. Yes. Yeah. That's the magic, and I think people don't translate the mechanical world into the electrical world. That that's what's [00:08:00]happening. They,  Howard Penrose: they don't because, because what's happening is they named it wrong.  Allen Hall: Yes.  Howard Penrose: A majority of our users are mechanical folks. Sure. Our vibration analysts and stuff like, 'cause they know how to look at the signatures. Right. Everybody tries to force it on their electrical people, and electrical people go, "We don't know what this is." Yeah. And it's, it's, it's a matter of that training and, and, you know, in the electrical world, you're not taught to look at that. Right. Yeah. It doesn't matter. Mechanical world, you're taught to look at that. So our intern, we were trying to bring in electrical engineering interns and found out that just wasn't working. So last year, I brought in my first, uh, intern that's, you know, he's been with us now since I brought him in. Okay. Uh, and, uh, Amar, and, uh, you know, he's helped us develop our vi- uh, vibration software to go along with it. Guess what? It's the same thing. It's the exact same sy- system Um, but we just take in a vibration signal instead. ...