Hello - I have ordered a couple of Solo controllers to try out. Can you recommend a power supply that can allow 40v and 100 amps? What power supply are you using on the youtube demo?
Thanks for your order and interest on SOLO, sure we can, I'm providing you the list of suitable power supplies that can fulfill your need, but remember, the current you draw from a power supply is not necessarily the same current circulating inside your motor, as a matter of fact, the best way to select a power supply will be considering its maximum continuous power, and that power should exceed by a little margin your electric motor's rated power. So considering the continuous output power of the power supply something around 600W - 800W, The list that I recommend to you will be :
my power supply in youtube which is a laboratory power supply :
Other more economical solutions:
the mentioned power supplies are either 36V or 48V ( I believe in some of them you can trim a little bit the voltage, you should check their datasheet carefully), 40V is not a standard voltage output for the fixed output models, so you need to check this that if you can use either 36V or 48V supplies with the more economical approach as the second list options.
@milad Thanks! I am kind of new in this field. So, this is quite helpful. Quick question. Does Solo board handle the regeneration? Or Do we need a bidirectional power supply instead?
Can you also provide me the information of the PMSM motor that you are using for the demo?
-Regarding Regeneration, Yes, SOLO offers regenerative brake feature, with maximum current fed back, limited on the maximum current allowed into the motor ( you can tune this value using current Limit analog input here). As a matter of fact, regeneration is used once you are using Batteries in your system, so that the regenerated power from the Motor during braking action will be fed back into the batteries to recharge them, in your case, if you are using a power-supply, regenerative energy might cause to force the output of your power supply ( BUS voltage ) rising into higher values than it has been set for a short time, so it's better you choose a power supply with Over-Voltage Output Protection. ( The laboratory power supply above has this feature )
- To reduce the effect of BUS voltage rise due to regenerative brake, you can use big capacitance at the BUS input of SOLO ( voltage Input ), currently SOLO has 1920uF of internal capacitance, you can put your desired capacitance in the input of SOLO to reduce the effect of BUS voltage rise ( make sure your power supply supports that much of capacitance at its output, some switching power supplies might have a limitation for maximum output capacitance)
- The PMSM motor I'm using is a pretty nice servo AC brushless motor (PMSM) for experimentation purposes, and you can find it on:
- The model: teknic m-2310P-LN-04K
@milad I have reached out to teknic for a PMSM motor so that we can re-create a bench application for learning. One of the teknic representatives told me that all M-2310 motors are BLDC motor by nature (not PMSM). Can you confirm that you are getting a non-sinusoidal back emf through them?
first of all, Based on the datasheet provided by teknic you can see:
"Carefully skewed, sinewave stator/rotor design produces a smooth, uniform, sinusoidal torque constant with low harmonic content..."
the sinusoidal winding of rotor/stator is a characteristic of Brushless AC or in the other term PMSM motors, BLDC motors have concentrated windings, in the other words The main difference between an AC and a DC brushless lies in the realization of the windings, in case of AC brushless the windings are distributed and in case of Brushless DC motor the windings are concentrated. As a result in AC brushless motors, the induction distributed along the air gap is sinusoidal while In the case of a DC brushless the induction has a square wave trend.
secondly based on the following references one by Texas Instruments and one by NXP, this specific Motor is considered as a PMSM motor with sinusoidal BEMF, ( to best of my knowledge, we also observed sinusoidal BEMF in our testings long before in the beginning, but for SOLO the shape of BEMF can be either sinusoidal or triangular both for BLDC and PMSM motors)
In general, there might be some consideration for manufacturing that each company has their own perspective on how to look at these different type of motors, Some call them AC brushless and the others Permanent Magnet Synchronous Motors and some of them simply brushless motors, and also there are lots of methods for manufacturing these motors, but based on our testings and the references I've mentioned above there should be no problem for you to use these motors in your application. we will remain available for any further clarification.
@milad Thanks again for the clarification and I agree completely. While talking to the customer representative of Teknic, I pointed out the sinusoidal back emf image on M2310 spec sheet. But for some reason, he insisted on the 'BLDC' term. So, I got a little confused. Anyway, thank you! We have received your controller and can't wait to see them in action.