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  1. K

    Apex Microtechnology SA310 IC

    Just curious if anyone has been considering using the SA310 in a motor controller design. Maybe a small team (no cost to Apex) could convince Apex that a design concept that incorporates repairable battery block technology, active balancing battery management system, FOC based motor controller...
  2. K

    serial battery block project

    I thought I would share some info on a University senior student project that is being planned for Fall 2017. My interest is specifically serial battery blocks connected in parallel as part of single passenger urban commuting vehicle technology development (fancy trikes/velomobiles). I have...
  3. K

    2017 battery architecture resolutions?

    Anyone have detailed plans for battery architectures? For example, 1. No spot welding designs so easy repair of individual cells. 2. Serial blocks that are paralleled. 3. Single active balance BMS to manage all the blocks sequentially. 4. A BMS that actually controls the motor control action...
  4. K

    Anyone have direct contact with DOE ARPA-E?

    I am curious if anyone on this forum has ever had any direct contact with ARPA-E either via direct funding or through a academic grant relative to battery management systems technology? Thank you for responding. kenkad
  5. K

    actual 18650 cell anode end dimensions

    I am wondering why Sony provides the attached JPG of their VTC5 cell dimensions and yet when I communicate with cell suppliers they say that the anode top is absolutely flush with the shrink wrap edge. Can anyone shed more light on this question?
  6. K

    Revolt motor std shipping to USA, how long?

    Hello, Anyone who has had a Revolt motor shipped standard shipping (I assume by boat container first to US), can you indicate what the length of time it took to get your motor via USPS? Thanks. Mine is on/in some container on a slow boat and it has been over 5 weeks. Still no indication that...
  7. K

    N-cell serial bat blocks connected in parallel - BMS concept

    Hello, I am curious if there are any ES members that would be interested in working with University special project EE Department students to study a possible n-cell serial battery blocks connected in parallel BMS with the goal of a system that incorporates the AS8506C Active Balancer IC. If...
  8. K

    Does your WI freewheel on a Staton adapter wobble?

    Recently, i had a need to use a WI Eno 16T freewheel on a 5/8 shaft Staton adapter. I found that checking the adapter + freewheel on a lathe showed a significant non-concentricity and wobble. I contacted both companies and explained the numbers I had gotten. When I put together the new rear...
  9. K

    any ES member have direct access to these PS units?

    Hello, Any member of ES have access to the LW7530KD power supplies. I need two units for motor testing. Original quote was $135 before they realized I was from USA. Then they said I would have to buy from Voltec at $559. So I am wondering if anyone in the Far East has direct access to these...
  10. K

    44 BCD to 74 BCD adapter

    Does anyone know of a source for a 44mm BCD disc mount to a 74mm BCD chainring (Sugino or equivalent) cog adapter that has a 2.5mm offset. I need to shift the 6 bolt disc mounting plane toward the rear hub center by 2.5mm minimum. Thanks for responding. I added a JPG of what it may look like.
  11. K

    motors equivalent to Revolt RV 100-Pro

    I am planning a student project (dynamic stability of a recumbent trike) for the fall school start. The current design is setup for the RV 100-Pro mounting scheme. Is there another motor alternative that has virtually identical mounting and dimensions? Thank you for your suggestions. I do...
  12. K

    BMS with serial interface

    Does anyone know or have experience with a serial com port based BMS, preferably RS485. Of interest is how BMW i3 is using an AMS AS8510 front end in their onboard BMS. The AS8510 has an SPI interface.
  13. K

    a magnetic rotary sensor with dynamic timing advance

    Here is some info I have referenced before. I am a proponent of using a magnetic rotary sensor instead of Hall sensors or sensorless control. This removes a computational burden from the uC in the controller running the BLDC motor. I am using the AMS AS5047D, 4-wire SPI, 24FV32KA301 on a 1x1...
  14. K

    Technology challenge - combined in/outrunner for ducted fan

    Homebuilt Aircraft Forum is wondering if anyone has ever seen a BLDC motor design that combined an inrunner and an outrunner, counterrotating, on a common shaft, output one side. Maybe the inrunner operates at twice the voltage of the outrunner so torque is roughly equivalent, etc. Need to be...
  15. K

    Regenerative braking using IPMs

    I have attached a paper that discusses regenerative braking. What I am curious about is with the use of an IPM, my assumption is that the IGBTs (or Mosfets) are simply shut down and the free-wheeling diodes route the energy back to the battery. What I do not understand is why one would want to...
  16. K

    sine wave controllers 120 or 180 degree modulation type

    I would like to encourage those members or companies discussing sine wave controllers 'to categorically state whether their controller/three-phase bridge controller are either 120 degree or 180 degree modulation'. The consequences of using a 120 degree modulation controller are significant and...
  17. K

    need astroflight 3220 motor help for graduate student projec

    Hello, I am putting this request in this section of the forum because not everyone looks into the Wanted section. I am supporting a graduate student project on developing a sine drive modular controller. I would like to be able to use a 3220 low wind (70-80Kv) motor for testing purposes. I...
  18. K

    Free PCBs for AS5048A magnetic rotation sensor

    Hello, If anyone is interested in a free PCB to be able to try out the AS5048A magnetic rotation sensor IC, I have five Ver 1 PCBs (blank, no parts on them) that are first self addressed envelope first gets. The PCB is 1x1 inch square, uses a Microchip 16F1829. I have attached a couple of JPGs...
  19. K

    carbonfiber hub/spoke assy for standard rims

    Hello, Has anyone on this forum attempted to make a carbon fiber hub/spoke assembly that can have a standard bicycle or motorcycle rim attached to the assembly? I will try to explain one possible process. For example, I can take a reasonably low cost Sette disk brake style hub (number of spoke...
  20. K

    TI LDC1000 inductive position sensor

    Those that are interested in absolute position sensing of rotor/stator relationship with having to use Hall sensors, may want to take a look at this TI new part. There is an E2E forum on inductive sensing. You have to use two coils (see brochure description). It is a bit early to know exactly...
  21. K

    LS Power Semitech IKCM15L60GA Integrated Power Module

    Hello, Has anyone used this IPM for driving a BLDC motor? If you have, could you PM me. I have some particular design questions about the bootstrap and current limiting because I need to be able to shutdown the IPM if its three-phase drive is not supposed to be operating. kenkad
  22. K

    Source for 26 ga grain oriented steel 12x12 sheets

    Hello, I looked through some of the previous threads and could not find any refernece to a source for 26 ga (0.0185 inch) thickness grain oriented steel. I need 12x12 inch sheets. Thanks for any sourcing help. I thought Miles had listed some sources in a previous thread. kenkad
  23. K

    carbon fiber rotors for an AF BLDC motor

    Hello, Has anyone on this forum or has anyone seen any discussion on making the rotors (with embedded magnets) for a dual rotor axial flux BLDC motor from carbon fiber using a combination of cloth, tube and tow materials? kenkad
  24. K

    DOE/ORNL electric vehicle interests

    I thought I would share some information with this forum about the interests of ORNL (DOE lab for electric vehicle technology development) as to what they perceive is the US mission in electric vehicle technology. Single passenger urban commuter vehicle technology is of no interest to ORNL...
  25. K

    dual rotor axial flux coil concept

    I did not want to hijack Miles thread any further, so I have posted the following coil concept I plan to use in my dual rotor axial flux motor design. I redid my original coil end flux directors so that they are easier to manufacture. I plan to use a Somoloy powdered disk as the starting point...
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