Great video. Can you tell me where you got the ndrive software? Cheers
@ShaqBeats
12 күн бұрын
Thanks for the video! Do you know what is the cause of the wiggle and how to stop it when you stop the motor?
@nikolaib2974
2 ай бұрын
We have a problem with the same setup, where we get error 6 (too high temperature of the motor). But the motor is not hot. We tried to overwrite it and change the limit, but when we switch to "run" the error returns. Any help for this problem?
@nalesnikdeusvult1369
3 ай бұрын
My guy u saved my life thaaaaank you ❤
@jaimeramirez6026
3 ай бұрын
Hello Chirs, a question to make run and go work on the ndrive, which pins are the ones you connected to enable that option and pin A and B of input X1, what are they connected to?
@leandrolicata9675
3 ай бұрын
Hello, I'd like to ask something about the "wiggle" thing. What are the reasons for this and did you fix it in the end?
@braulioteles3596
4 ай бұрын
Hello, I have one question regarding the initial current necessary for the motor to spin with load. If your car had 350 Kg and max output of the battery of 180 A on full battery, is that enough for him to spin? I´m sorry if the question is to basic but it´s my first project with an axial flux motor.
@chrisuustal
4 ай бұрын
A few questions. 1) can your motor spin without a load attached? We want to ensure that adding the load is what is causing the issue. 2) when you bolt your motor into the vehicle, can the vehicle roll freely without any resistance from the motor? No scraping or similar sounds of rubbing? I had issues with our 228 where the mounting bolts would scrape against the rotor on the inside of the motor if they were too long. 3) if you spin the motor without a load at low speeds and attempt to manually slow it (eg. With your hands, a dyno, etc.), does the motor torque increase and hold at a consistent value? Or do you get a kind of "rippling torque" type of feeling? If your motor is setup in open loop mode or improperly configured in closed loop mode, you will get inconsistent torque production which may be causing the motor to struggle to move the vehicle 4) the maximum current of the battery is not particularly important at low speeds. As a reminder, this is the job of the DC link capacitor within the inverter. While the power flowing into and out of the inverter will be the same (+ some heating losses), the voltage at the input is the battery voltage (eg. 600V) meanwhile the voltage at the output is linearly related to the motor speed (eg. Near 0 RPM the voltage is near 0V, near max RPM the voltage is near the max motor voltage). The current flowing through the motor is linearly related to the torque production. This means that, at low speeds, the motor will require a moderate amount of current to produce the torque needed to start the vehicle rolling, but this current will be at a low voltage because the motor speed is low. Because the voltage is low, the overall power consumption of the motor will be relatively low, in the range of a few kW should be more than enough to get the car rolling. Since power in = power out, assuming your battery voltage is around 600V, this should only require a few amps of current from your battery. The maximum current capability of your battery should only be important when you are drawing high amounts of power into the motor, and this happens at high speed and high torque scenarios. In short, yes, your battery is definitely capable of moving your vehicle. I assume there is an issue with either your inverter configuration or mechanical setup which is causing the issue. I recommend testing each part of the system individually, then slowly combining them to make the tester more representative of the whole vehicle to isolate where exactly the issue is coming from. Feel free to reach out if you have any further questions.
@SelmonBhai-fd6cc
5 ай бұрын
Hello, We're currently facing an issue while operating in test mode with dig commands, where the motor is not under any heavy load. Despite setting the N-100% to limit the RPM to 1800, with N-Lim % = 100%, N-lim+ = 100%, N-lim- = 100%, and restricting the current to 5% (approximately 21A), the RPM exceeds 1800, likely reaching the maximum RPM achievable at that current level. However, the display screen continues to indicate the maximum RPM set at N-100% (in this case, 1800 RPM, represented as 32767 at 0xa8), and the RPM keeps rising. We've also tried the same setup for 1000 RPM and 500 RPM, but the behavior persists. As I'm relatively new to this experience, could you please advise if you've encountered this issue before, or provide any assistance in resolving it? Your help would be greatly appreciated! Thank you!!
@chrisuustal
5 ай бұрын
Hello, I recommend re-reading the NDrive software reference manual. Particularly take a look at section 12.1.3 on page 74. N-100% is the maximum speed your motor is capable of (not the speed you want to limit it to). Since your motor has been exceeding 1800RPM in your testing, this value is set incorrectly. This max speed is captured in the motor datasheet. For example, if you're using an Emrax 228 like we were using in the video, that has a maximum speed of 6500RPM. You then put the speed you want to limit the motor to (as a percentage of N-100%) in the N-lim field. For example, if the max speed for the motor is 6500RPM and you want to limit the motor to 1800RPM for your test, then you set N-lim to 1800/6500 = 27%. As a reminder, motor speed is proportional to supply voltage, not current. If your supply is a standard 600V battery like many FS and FSAE teams use, you could expect a motor like the Emrax 228 to achieve well over 5000RPM. I recommend updating the value in the N-100% field to reflect your motor capabilities. Additionally, please refer to page 82 section 13.3 in the NDrive reference manual. As mentioned there, N-lim = 100% will disable the cruise limit and allow the motor to accelerate to whatever speed it can achieve with the supply voltage. This is what is happening in your test. As such, it is recommend to set this value to a maximum of 99% if you intend to use cruise limiting during normal operation. TL;DR - check the motor datasheet and set N-100% to the max motor speed, then set N-lim to whatever percentage of that max you want to limit to. To avoid future confusion, if you raise the speed limit in future tests on your motor, I recommend setting it to 99% so cruise will still engage at your max speed. Also, UniTek is really friendly! While these answers were in the software manual, they have been very responsive to my emails in the past, so I encourage you to reach out to them as well with questions. Let me know if the fixes above don't work!
@harshdoshi4800
4 ай бұрын
Hi Chris, While working on our fsae car, we faced a couple issues and needed some expert help. Context: We use an EMRAX228 HV motor controlled by a Bamocar D3 controller. We're currently controlling the motor via analog torque with a 0-10 volt analog signal on the AIN1+ . We haven't implemented AIN2 yet, but it's on our to-do list. We're facing a couple of challenges and hoping you might have some insights: 1: According to the Ndrive manual, the analog input should accept voltages between -11V and +11V, corresponding to digital values of -32767 to +32767. However, in our tests, the AIN reading never goes above 1200 even with a full 11V applied. We've been compensating by adjusting scaling factors to get a wider usable range, but we'd like to understand why the actual reading is limited. Additionally, do we strictly need to ground the AIN1- pin if we're only using a 0-10V signal? 2: During dynamic testing, the motor experiences shuddering when starting from a stop. We've set the peak current limit (Imax pk) to 100A and the maximum voltage to 500V, with no RPM limit applied. We're wondering if you've encountered similar shuddering behavior in your work. Any advice or troubleshooting steps you could share to address this issue would be extremely helpful. Thanks in advance for your time and assistance!
@prestonburton8504
7 ай бұрын
These motors are synchronous - but will they be damaged if we operate in V/F open loop mode and the rotor (magnets) 'slip' below the synchronous frequency? in other words, lets say we command a certain rpm, then bring up the expressed load (drive operates to maintain setpoint frequency with no feedback) and the torque cause the motor to not 'stay synchronized so it operates at a reduced RPM from normal setpoint frequency? is that something you have experimented with? I would expect that vehicle operation would have this dynamic? (i ask this because certain types of synchronous motors will demagnetize if load causes 'slip' between magnetic rotation and magnet rotation) (we are attempting to talk to Emrax but we have not received responses either email/telephone as of today)
@prestonburton8504
8 ай бұрын
can someone help me understand input phase frequency vs rpm for this motor (188)? i'm planning on running with parker vfd -which has a max frequency output of 588hz - is this enough to reach the top RPM limit of motor? 8000 rpm? thank you!!!
@colecaster0331
8 ай бұрын
Hi there! Currently in the process of ordering these very same components for our fsae project, although we are seeing that the unitek bamocar d3 manual claims it only reads 2, 4, 6, or 8 pole resolvers, not 10 pole which we were hoping to use as you are. Emrax offers 2 and 10 pole options, meaning we planned to default to using 2 pole. Was this something you contacted unitek to get clarification on, or was there any adaptations you had to make for this 10 pole resolver to be compatible? Thank you!
@jeppejuulpraastrup3355
8 ай бұрын
Hi Chris, I have my own bamocar D3 700/400, however it states that its only intended use is for battery connections; my counterargument to this is just to use a DC power supply to make it run. What are your thoughts? Best regards.
@chrisuustal
8 ай бұрын
You can safely run a power inverter like the bamocar D3 700/400 from a power supply, but you can never apply a negative torque during your testing. If you try to apply a negative torque to a rotating motor to slow it down, the kinetic energy of the rotating motor will be converted into electrical energy that has to flow back upwards through the power inverter and into the power supply. Most power supplies are not rated to handle power flowing back into them, so they may be permanently damaged. If you want to test active braking / deceleration of the motor, you will need to use a battery instead of a power supply. If you only plan to accelerate the motor and let it coast to a stop by friction / mechanical brake, a power supply is fine. I hope this helps!
@prestonburton8504
7 ай бұрын
we use AC to DC power supplies that are both regulated, and have 'dynamic regen capability' its just a dump resistor (sized correctly) and a switching circuit that cuts in when the bus voltage exceeds a setpoint - to dump the excess voltage/energy. they are pretty common or pretty easily produced. Its common on any inertial loads@@chrisuustal
@suntzu6122
9 ай бұрын
Is that the inverter you would use for an EV using this motor? Or is it a substitute? Im new to this sorry. Very cool!!
@markushiggins8871
Жыл бұрын
Hi, what software are you using to send CAN messages from your laptop to the motor controller?
@juanvegafuentes7589
Жыл бұрын
Hi Guys Im Juan from Chile I have a one question about the sensor for the Motor emrax 228. Context. I contacted the company Emrax and they told me that the Emrax 228 MV motor sensor they have in stock is the Tamagawa brand. I wonder if this sensor is compatible with the 700V Unitek Bamocar D3 controller or if the search another sensor, in this case wich one recomernder me Waiting for your reply, I am kindly taking my leave.
@meenalkumari3983
Жыл бұрын
Hello Sir, I like your video. I have three questions related to the EMRAX Air-cooled outer rotor motor. a) Where are the inlets for air to enter the motor and what is the recommended speed? Apart from this, there are holes on the front and rear disks of the motor. Does air enter from these holes also? b) What is the temperature that the motor body and the inner copper windings and core structure reach while running? c) Which parts of the motor rotate? Kindly reply if possible. Thank you.
@chrisuustal
Жыл бұрын
Hello, A) I'm not sure, we use the liquid cooled version only. B) The inner windings can reach up to 110C during operation. If you exceed 120C, expect your motor to be damaged. C) The entire outer shell of the motor rotates. The only part that remains stationary is the metal panel on the side shown in the video where the electrical connections and water cooling fittings are exposed.
@meenalkumari3983
Жыл бұрын
@@chrisuustal Thank you Sir for your reply. As you said the whole motor is rotating except the metal panel, so I want to mention that I am studying EMRAX 268 model. For that model, I had read somewhere that only the motor disks and outer rotor ring rotates. Copper and core parts remain stationary. a) So is it possible that different models of EMRAX outer rotor motor have different rotating parts? b) In your model, the rotation of whole motor body is taking place. So I want to know are there any wire connections inside the rotor which may get twisted when the motor rotates? I am new in the motor domain so kindly reply. Thank you.
@chrisuustal
8 ай бұрын
@@meenalkumari3983 Good question. To clarify, the motor is composed of 2 parts: a set of stationary copper windings and shell of rotating magnets. When looking from the outside, the entire black surface rotated. However, you are correct that on the inside all of the copper windings remain stationary inside the bulk of the motor. Only the outer shell rotates. Thank you for clarifying. This applies to all motors in the Emrax lineup.
@prestonburton8504
8 ай бұрын
can someone help me understand input phase frequency vs rpm for this motor (188)? i'm planning on running with parker vfd -which has a max frequency output of 588hz - is this enough to reach the top RPM limit of motor? 8000 rpm? thank you!!!
@vijaykorvekar1009
Жыл бұрын
How much did the motor cost
@chrisuustal
Жыл бұрын
The motor as-configured is about $4200, so with shipping and import fees to the US it's about $4500 total
@polyteky
10 ай бұрын
@@chrisuustal Hi, Is it just the motor or the entire setup cost?
@chrisuustal
10 ай бұрын
@@polyteky Just the motor. Inverter was about $3k and resolver was another $500
@kral5932
Жыл бұрын
Hello, I'm just wondering if you ever had any issues with the resolver? Also, when the motor is not moving, does your motor position value on the position page stay constant? Thank you!
@chrisuustal
Жыл бұрын
We did have one issue where we couldn't properly auto-calibrate our motor, but it turns out we had the sine and cosine signals from the resolver swapped--after that there were no issues. When the motor is not moving, I believe that value stays constant, but I would have to double check to confirm
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