Monday, February 23, 2015

Video of quickly trued Mac 7T motorized Alexrims DM18 wheel

I spent literally 5 minutes truing the wheel and it came out quite well. I did a very close up video of the wheel here:

My Park Tools Truing Stand only has one finger to measure the wheel so here it is very close to the wheel.

Friday, February 20, 2015

Lacing a MAC geared motor to an Alex Rims DM18 WHEEL

I was motivated last night, the coldest night of the year so far, to lace up the MAC geared motor to the Alexrims DM18.

The SAPIM spokes are double butted and gorgeous!

I haven't trued it yet but that's next.

Saturday, January 24, 2015

Sturdy rear rack

This rack came up for sale on

I grabbed it for the very sturdy design and build quality. It needs a custom bracket to attach it to my bikes but that's not very difficult to fabricate. It's much thicker that standard racks and has a double shelf. If I use it with the black Tidalforce in electric bike, it would make it look very much like a cargo Bike!

Spring project controller (field-oriented controller)

 I picked up an field oriented controller (FOC) a few days ago. These are highly specialized, programmable controllers that offer complete control of motors both sensored or sensorless. The first and maybe only batch of these have sold out, unfortunately. These are no longer available from the OEM as an easily customized part. They are now encased in a resin case.

I hope to be able to put this to good use with the E+ motors that I have. The E+ motors are 3 phase motors that have integrated custom/proprietary controllers that require proprietary batteries. However, they should be able to be used as generic 3 phase ebike motors if the integrated controllers can be bypassed. This controller may even be used with the 7 phase Tidalforce motors but I'm not going to touch a beautiful motor/controller combination that is the Tidalforce system! 

The BAC500 is a field-oriented controller that uses sine-waves to feed power to the motor and so is much quieter than typical square-wave controllers. The buzz that you hear from your typical eBikes is usually the square-wave noise and the resultant noise generated by the motor windings. A FOC by definition automates the phase advance process so that the motor is driven at optimal timing even at very high RPMs.

The Tidalforce and E+ systems utilize sine-wave controllers so are extraordinarily quiet. In use, they are essentially completely silent.

The BAC500 is a tiny package with a custom CNC torpedo shaped case. It's slightly thicker than a Cycle Analyst.

Monday, November 17, 2014

Picture of Tidalforce M-750X electric bike with the Auxiliary Water Bottle Battery Pack

I took the bike outside to take some clear pictures of the Tidalforce M-750X electric bike with the auxiliary water bottle mounted battery. It looks really nice and clean. I need to do a few more things. Clean up the cables some more and to add a disc brake to the front fork so that it can work with the disc wheel! :)

Completed Tidalforce Electric Bike Bottle Mount Battery Pack

I spent a few minutes last week finishing up the Tidalforce Electric Bike Bottle Mount Battery Pack.

I wrapped the case with an acrylic outer shell and overwrapped it with some very wide gaffers tape. It looks very clean and matches the frame of the Tidalforce bike very well. It's highly water resistant and the acrylic protects the cells inside.

With the battery mounted near the middle of the bike, the balance is greatly improved over a rear rack mounted pack. Also, the bike feels so much lighter to move around. I haven't measured it yet, but it has to be at least 25 lbs lighter than with the front hub battery.

Saturday, November 8, 2014

Progress on bottle mount battery for my Tidalforce electric bike

I worked on the bottle mount battery tonight. I bought some acrylic and gaffers tape and created a shell/case for the somewhat delicate LIPO battery. The battery does not have a protective case so I created one. I need to put a top on it and seal it from the elements, however, it's very stable and looks very solid. I used 3 3M Velstraps.