>>920852 depends what you mean by "hoverboard". if you're thinking about something on wheels, then it would be pretty easy. building something that would bend the laws of physics on the other hand would be difficult
There's places on aliexpress that sell all the parts you'd need. The gyro could just be a arduino + 9DOF board. I know there are guides online for making balancing arduino "segway" style robots (with only two lateral wheels)
Pic related: found these motorized skateboard wheels while browsing once. I don't know if these are the same motors used for the hoverboards or not.
>>921167 it's kind of just a hobby off to the side to keep me busy between classes. im an EE student in ieee so the electrical stuff isn't too bad for me. was just wondering if anybody actually has done it before/knows what it would cost.
>>921859 >electric skate board Five years ago my neighbor wanted to make a motorized skate board.
I helped him with the circuitry and everything. He of course wanted it to go insanely fast.
Three weeks after he finished it he was out riding it around flying down the street and hit a rock. Wasn't wearing a helmet and slammed the back of his head into a curb.
Now he has an electric wheelchair and a drool rag. I kept scolding him to wear his fucking helmet but never did. I had even told his wife to hound him about, she told me he'd be fine. Now that she divorced him, his mother moved in to change his diapers and bedpans.
I get so infuriated when I see people not wearing their helmets.
>>920852 You'll need to drive 2 BLDC motors independently with Hall sensors for proper commutation sequence. You need an MCU that can drive 2 BLDC interface chips which in turn drives 2 three phase inverters. The original used an ST F1xx series ARM to interface to the BLDC drivers and read the LSM330 IMU. You'll also want to look into LiFePO batteries and really understand their characteristics. We upgraded the microcontroller to an ST Cortex-M4 but I don't know what made it into production.
>>923122 Honestly, the simple answer is: the entire project is built around a reference design and software provide for free by ST Microelectronics on their website.
It's a couple of PID loops monitoring the lean angle of both footpads and the rate of change in lean angle. The commutation pattern of the BLDC is handled by a special driver chip and the MCU. You do need Hall effect sensors to detect when to switch phases on the BLDC however. RPM isn't really a relevant quantity since the output of the final PID loop generates a term that translates to a torque vector. I'm other words, the controller doesn't care how fast the motor is turning and doesn't seek to directly control RPM. Rather, it modulates the field strength from coil to coil as the motor turns. The application and outcome is deceptively simple for how complex the math is.
Look up BLDC drivers on ST's site and be prepared for really interesting math.
>>923131 The knock offs and, unfortunately, the original all have a couple main issues with the battery. First, in the original, it's a lithium iron phosphate battery which is unlike lithium metal hydride or lithium polymer. LiFePO can handle 100s of amps of pulse current discharge but it must be kept within strict operating temperature limits for charge and discharge. So one issue is that the pack has no charge or discharge limit by design because the motors can draw huge amounts of current. What happens is the pack generates gas (not hydrogen) and blows its safety vent. This is not harmful in itself but without temperature monitoring the external charger will eventually overcharge the batteries and the loss of electrolyte causes cell failure. Second, the manufacturers cheap out on battery packs and aren't using matched cells or a charger for LiFePO and the required cell balancing method. If I remember it is a LiMH charger which has a very different charge curve than LiFPO. So the combination of cheap cells and POS charger cause premature cell aging and excess heat generation. I can't confirm this but I suspect that the Chinese copies are not using LiFePO cells but the cheaper LiMH or LiPo cells which absolutely can't handle the 50 or 75 amps of surge current under heavy acceleration. They also aren't suited for regenerative braking.
>>923141 Yes, to put it simply. Lithium chemistry batteries are tough if charge and discharge are handled properly. LiFePO is still fairly new so there aren't a lot of charger topologies to support the various implementations like LiMH or LiPo.
>>923159 They are fairly simple. The primary board consists of a STM32F1 MCU, 2 BLDC motor control circuits. Secondary boards consist of a cheap MCU, MP6050 6 axis gyro and a pressure sensor for each side. The two control boards send gyro and pressure sensor data to the main STM32F1 board.
>>920865 10 fucking kilowatts in something 10CM in diameter. What in the fucking shit would use something like this? A fucking smartcar? Seriously though, you could build a fucking go kart out of that shit. A go kart with 10% the go of a fucking car
>>920865 A hoverboards' rate of acceleration is determined by the rider's lean angle:
tan <lean angle> = <acceleration> / <gravity>
The rider would have to lean to a ridiculous angle to make use of a 10kW motor's power! Practically, you would be limited by rider's skill in their ability to lean in a controlled manner. Most hoverboards use 150W motors which are adequate for most riders' skill. How much power could a pro rider use? 500W? No where near 10kW.
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