#### Mike leroy

##### Active Member

This article investigates whether Neodymium motors have the potential to double peak torque at half the cost of traditional eBike samarium cobalt motors. Neodymium is about half the cost of traditional ebike Samarium Cobalt magnets. Neodymium magnets are also lighter. See this thread about the risk of insufficient glue used in some neodymium motors.

Repeat after me, "Neodymium". A tongue twister! NeoWhat? NeoNazi? NeoJumper (EasyMotion)? NeoDummy? NeoDada? No, articulate Swahili very sloooowly and deliberately. NeoDimwit? NeoFascist? Huh? NeoDone!

I give up, pronounce for my twisted tongue, Google. I have an ear ache from straining so hard.

Oh, you don't say. More accurately, you pronounce better than me!

Currie Tech uses neodymium magnets in some of their high torque motors, 42Nm nominal, 96Nm torque from 750W, 36V. Compare with 75oW, 40Nm nominal, 50Nm peak, Polaris Aapex. The iZip Express generates almost twice the peak torque, which is a huge improvement. My rule-of-thumb is 5Nm for each percent grade at my weight (175 pounds) at wobble speed (9mph). So, I expect the iZip Express could climb the steepest hills in my area (20% grade). I estimate the Aapex could only push me up the slightest hills (10% grade) at wooble speed.

The 4000W HPC motor weighs 15.9 lbs. The 6000W neodymium motor weighs 16.9 lbs. A 50% increase in power for an 8% weight increase, or one pound. The Sm-Co 3500W Revolution Sport weighs 79 pounds, which is only suitable for local commuting.

I would buy a 50 pound, geared, 1000W neodynymiun HPC Revolution, which would allow me to take the bike on Amtrak trips.

The 79 pound Revolution has a Sm-Co motor that is seven pounds heavier than the 1000W motor. The 36V, 26Ah battery for the 1000W motor only weighs 9.5 pounds. The 78V, 26Ah battery weighs 13.5 pounds. The 11 pound battery and motor difference would bring a 1000W HPC Revolution down to 68 pounds. Without the battery, a 1000W Revolution would weigh about 58 pounds. A new motor might even bring the weight close to 55 pounds. Very close to my goal!

I like many features about the $9000 HPC Revolution. I especially like the swingarm because the rear wheel weighs about 35 pounds, or about half of the total weight. Neodymium will cut the weight significantly .

Take a look at the 68 pound, neodymium-powered iZip express; 95Nm torque for $2800! In my mind, the iZip is a better deal, pound for pound.

In passing, each Toyota Prius contains 2.2 pounds of Neodymium magnets.

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I write articles in my spare time from the comfort of my iPad and bed. I will update this post as I learn about neodymium motors. Check back frequently. The content changes daily for the first week.

Repeat after me, "Neodymium". A tongue twister! NeoWhat? NeoNazi? NeoJumper (EasyMotion)? NeoDummy? NeoDada? No, articulate Swahili very sloooowly and deliberately. NeoDimwit? NeoFascist? Huh? NeoDone!

I give up, pronounce for my twisted tongue, Google. I have an ear ache from straining so hard.

Currie Tech uses neodymium magnets in some of their high torque motors, 42Nm nominal, 96Nm torque from 750W, 36V. Compare with 75oW, 40Nm nominal, 50Nm peak, Polaris Aapex. The iZip Express generates almost twice the peak torque, which is a huge improvement. My rule-of-thumb is 5Nm for each percent grade at my weight (175 pounds) at wobble speed (9mph). So, I expect the iZip Express could climb the steepest hills in my area (20% grade). I estimate the Aapex could only push me up the slightest hills (10% grade) at wooble speed.

- MOTOR: Exclusive Currie Electro-Drive® 750W Hi-Torque DC Neodymium Magnet Motor
- MOTOR SPECIFICATIONS: 96 Nm Peak Torque, 42 Nm Rated Torque, 750 Watts
- BATTERY: EV Rated Rechargeable Lithium-ion Cells In Power Pack with Advanced Power Management System 36V20Ah 720Wh

The 4000W HPC motor weighs 15.9 lbs. The 6000W neodymium motor weighs 16.9 lbs. A 50% increase in power for an 8% weight increase, or one pound. The Sm-Co 3500W Revolution Sport weighs 79 pounds, which is only suitable for local commuting.

I would buy a 50 pound, geared, 1000W neodynymiun HPC Revolution, which would allow me to take the bike on Amtrak trips.

The 79 pound Revolution has a Sm-Co motor that is seven pounds heavier than the 1000W motor. The 36V, 26Ah battery for the 1000W motor only weighs 9.5 pounds. The 78V, 26Ah battery weighs 13.5 pounds. The 11 pound battery and motor difference would bring a 1000W HPC Revolution down to 68 pounds. Without the battery, a 1000W Revolution would weigh about 58 pounds. A new motor might even bring the weight close to 55 pounds. Very close to my goal!

I like many features about the $9000 HPC Revolution. I especially like the swingarm because the rear wheel weighs about 35 pounds, or about half of the total weight. Neodymium will cut the weight significantly .

Take a look at the 68 pound, neodymium-powered iZip express; 95Nm torque for $2800! In my mind, the iZip is a better deal, pound for pound.

In passing, each Toyota Prius contains 2.2 pounds of Neodymium magnets.

---

I write articles in my spare time from the comfort of my iPad and bed. I will update this post as I learn about neodymium motors. Check back frequently. The content changes daily for the first week.

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