Control.com - Nerds in Control

My son's razor E100 scooter stopped working and I believe it's the motor controller. The scooter stopped moving, I checked the motor and fuses and they all work. So that leaves the throttle cable and motor controller. You cannot purchase the motor controller any more so I wanted to just build the circuit myself. Anyone have suggestions on circuit layout or recommended sites with circuit diagrams I could use as templates? The throttle I believe works like a linear POT to adjust the resistance on the controller which controls the speed. Maybe it's the throttle cable, any suggestions?

If you simply by-pass the Pot - make sure the back wheel is off the ground - that will tell you if that part of the circuit is working.

I would highly recommend you look on eBay - there is a very good chance you will find it there.

Bob Hogg

It may be a simple PWM amplifier if the motor is a DC brush motor. You could buy one that takes a linear (Potentiometer) input signal. If its a brushless DC, you will have to have provisions for commutating it such as Hall switches in the motor.

~Ken

search cheap dc motor control with or with out pulse width modulation and you might find any number of small circuits that might work, or there are small dc drives called kbic. they work with a veriety of dc supplies, i.e. 12 and possibly 24 volt and also other voltages. full control and config settings are common with all drives now. mounting and hiding the dc drive might be the problem, and you might need to check out how the drive might as the battery goes flat will this affect the drive. you might have to do somthing special like use the 12 volt version on a 24 volt supply with a regulator circuit. while the batteries are going flat the regulator constantly supplies the pc board with 12 volts while the controlled motor voltage runs between max output and min output. good luck and happy
building or should i say rebuilding.

Did u ever get a resolution to this problem? I have a similar problem.

It appears that the throttle isn't adjusting the speed. I have the whole unit apart. I start the wheel and it runs wide open, no throttle adjustment allowed, the only way to stop it is to engage the brake which appears to disengage the voltage to the motor?

any schematics or ideas?

One of my nephews has the same scooter/problem. First of all, no mfr. is going to produce a proportional FET controller for a $130 scooter..... the circuit is a simple time-varied relay circuit that applies the full 24V to the motor at interval on/off times which are varied by the speed control. It is the cheapest implementation of speed control I have ever seen. If I can't get Razor to send me a schematic, I may draw one myself for possible repair. The relay is a $3 part; its demise is suspect based on its use in the circuit. The best way to test the relay is to open the controller circuit and poke a hole in the relay at the point where you can manually activate the relay to check the contacts. If the motor runs, then the relay contacts are probably good; the timer circuit could be bad. It is a two-transistor astable multivibrator whose duty cycle is varied with the speed control. One of the transistors could be bad, etc. If Razor does not help, I will definitely publish my findings to the general public with details on a simple repair. I've found that knowledge can be a great motivator in may cases.

Any help with schematics would be appreciated. THanks.........

We had a E100 scooter in the shop last week. Firt of all these little scooters dont have PWM control, the circuit simply wont start the motor until you manually push it to 3Km/h to prevent the motor from burning out. The simplest way to fix this board, if the relay and throttle switch(not a variable switch) are still good, is to simply bypass this circuit. You still have to push start the scooter so the motor won't burn out, but the motor can now be switched on at any speed. First locate the two inputs from the throttle and brake on the circuit board and jump it to the + relay so when the throttle is pushed current flows from possitive through both throttle and brake switches and into the relay. Cut the original link to this post by cutting into the board with a knife to prevent smoking. Then connect the other side of the relay to - Battery. Now when you hit the throttle the relay simply turns on and the scooter works again. A simple fix to an expensive repair.

I bought one at a yard sale and had to replace the batteries but it still wouldn't work until I read this article as I tried to have it start from a standing stop.

i have the same problem i have tested the battery but when i try to turn my scooter on NO power comes through to the switch or to the batery life i cannot find a BLDC motor driver and am not sure now what to do?