开云体育

BLDC Simulation

Jayal Pansuriya All Messages By This Member #128128 Hi, I am have intermediate skill for simulation, just trying to simulation BLDC motor from LTwiki example(http://ltwiki.org/files/LTspiceIV/examples/Motors\MotorTest01). I managed to simulation with default parameters but not sure, if I can change speed or commutation frequency.? Your comments would be appreciated.? Thanks, Jayal Pansuriya
Vlad All Messages By This Member #128130 Hello Jayal I am have intermediate skill for simulation, just trying to simulation BLDC motor from LTwiki example( http://ltwiki.org/files/LTspiceIV/examples/Motors\MotorTest01). I managed to simulation with default parameters but not sure, if I can change speed or commutation frequency. The speed of the simulation is given (mostly) by the models. As for the parameters, they are there, as long as you know what you're changing, nobody is stopping you from testing. -- Vlad ______________________ ltspicegoodies.ltwiki.org v2: quite universal analog/digital filter, power electronics, signal processing, easy to work with math functions, digital models, and rants.
Donald H Locker All Messages By This Member #128131 Did you review the content of the file which documents (as much as there is) these files? As a brushless DC motor, the speed should be [nearly] proportional to the applied voltage and the commutation frequency should proportional to the speed. Donald. Plain Text email -- it's an accessibility issue () no proprietary attachments; no html mail /\ <> toggle quoted message Show quoted text On 2021-02-23 5:13 p.m., jayalpansuriya@... wrote: Hi, I am have intermediate skill for simulation, just trying to simulation BLDC motor from LTwiki example(http://ltwiki.org/files/LTspiceIV/examples/Motors\MotorTest01). I managed to simulation with default parameters but not sure, if I can change speed or commutation frequency.? Your comments would be appreciated.? Thanks, Jayal Pansuriya
Jayal Pansuriya All Messages By This Member #128152 Hi Gents, Thanks for your comments, Initially, my thought was motor will spin faster by changing commutation frequency. Anyways, I have managed to change motor speed by increasing input voltage as it is function of Back EMF.? Appreciate for your comments.? Kind Regards, Jayal Pansuriya toggle quoted message Show quoted text On Tue, 23 Feb 2021 at 23:51, Vlad <imbvlad@...> wrote: Hello Jayal > I am have intermediate skill for simulation, just trying to simulation BLDC > motor from LTwiki example( > ). I managed to > simulation with default parameters but not sure, if I can change speed or > commutation frequency. The speed of the simulation is given (mostly) by the models. As for the parameters, they are there, as long as you know what you're changing, nobody is stopping you from testing. -- Vlad ______________________ v2: quite universal analog/digital filter, power electronics, signal processing, easy to work with math functions, digital models, and rants.
Donald H Locker All Messages By This Member #128153 Again, increasing the supply voltage (the V source labelled VHV near the top right of the schematic; it is set to 24V) will increase the motor speed (and, consequently, the commutation frequency.) Changing it to 12V will slow the motor to about half speed; increasing it to 48V will approximately double the motor speed. It is a brushless DC motor - speed is controlled primarily by the supply voltage. Commutation frequency is a function of speed; speed is NOT a function of commutation frequency. The way to change speed is to change the supply voltage; commutation frequency will then also change. Did I mention to change the supply voltage (change it from 24V) to change the motor's speed? Donald. -- Plain Text email -- it's an accessibility issue () no proprietary attachments; no html mail /\ <> toggle quoted message Show quoted text On 2021-02-25 1:02 p.m., Jayal Pansuriya wrote: Hi Gents, Thanks for your comments, Initially, my thought was motor will spin faster by changing commutation frequency. Anyways, I have managed to change motor speed by increasing input voltage as it is function of Back EMF.? Appreciate for your comments.? Kind Regards, Jayal Pansuriya On Tue, 23 Feb 2021 at 23:51, Vlad <imbvlad@... <mailto:imbvlad@...>> wrote: Hello Jayal > I am have intermediate skill for simulation, just trying to simulation BLDC > motor from LTwiki example( > http://ltwiki.org/files/LTspiceIV/examples/Motors\MotorTest01 <>). I managed to > simulation with default parameters but not sure, if I can change speed or > commutation frequency. The speed of the simulation is given (mostly) by the models. As for the parameters, they are there, as long as you know what you're changing, nobody is stopping you from testing. -- Vlad
Jayal Pansuriya All Messages By This Member #128154 Hi Donald, Agree with you, it performing as expected. Regarding increasing voltage, I have bit knowledge of BLDC motor so I thought lets change supply voltage instead of Back EMF for quick check.? Kind Regards, Jayal Pansuriya? toggle quoted message Show quoted text On Thu, 25 Feb 2021 at 18:38, Donald H Locker <dhlocker@...> wrote: Again, increasing the supply voltage (the V source labelled VHV near the top right of the schematic; it is set to 24V) will increase the motor speed (and, consequently, the commutation frequency.) Changing it to 12V will slow the motor to about half speed; increasing it to 48V will approximately double the motor speed. It is a brushless DC motor - speed is controlled primarily by the supply voltage. Commutation frequency is a function of speed; speed is NOT a function of commutation frequency. The way to change speed is to change the supply voltage; commutation frequency will then also change. Did I mention to change the supply voltage (change it from 24V) to change the motor's speed? Donald. -- Plain Text email -- it's an accessibility issue () no proprietary attachments; no html mail /\ <> On 2021-02-25 1:02 p.m., Jayal Pansuriya wrote: > Hi Gents, > > Thanks for your comments, > > Initially, my thought was motor will spin faster by changing commutation > frequency. Anyways, I have managed to change motor speed by increasing > input voltage as it is function of Back EMF.? > > Appreciate for your comments.? > > > Kind Regards, > Jayal Pansuriya > > On Tue, 23 Feb 2021 at 23:51, Vlad <imbvlad@... > <mailto:imbvlad@...>> wrote: > >? ? ?Hello Jayal > >? ? ?> I am have intermediate skill for simulation, just trying to >? ? ?simulation BLDC >? ? ?> motor from LTwiki example( >? ? ?> >? ? ?<>). >? ? ?I managed to >? ? ?> simulation with default parameters but not sure, if I can change >? ? ?speed or >? ? ?> commutation frequency. > >? ? ?The speed of the simulation is given (mostly) by the models. As for >? ? ?the parameters, they are there, as long as you know what you're >? ? ?changing, nobody is stopping you from testing. > >? ? ?-- >? ? ?Vlad
Richard Damon All Messages By This Member #128156 On 2/25/21 1:36 PM, Donald H Locker wrote: Again, increasing the supply voltage (the V source labelled VHV near the top right of the schematic; it is set to 24V) will increase the motor speed (and, consequently, the commutation frequency.) Changing it to 12V will slow the motor to about half speed; increasing it to 48V will approximately double the motor speed. It is a brushless DC motor - speed is controlled primarily by the supply voltage. Commutation frequency is a function of speed; speed is NOT a function of commutation frequency. The way to change speed is to change the supply voltage; commutation frequency will then also change. Did I mention to change the supply voltage (change it from 24V) to change the motor's speed? Donald. Actually, you CAN control speed with commutation frequency, but only downwards, if you disengage that automatic commutation system normally being used, you can get very tight speed control by using a fixed frequency commutation. You do need to monitor the speed the motor is going because if something does cause it to drop you may need to adjust the commutation to keep it from loosing lock. -- Richard Damon
Donald H Locker All Messages By This Member #128158 Good point. The OP asked about increasing speed, so I was thinking in that direction. In the provided models, I didn't see any means to modify commutation frequency (though I admit to not looking very hard.) Donald. -- toggle quoted message Show quoted text On 2021-02-25 2:42 p.m., Richard Damon wrote: On 2/25/21 1:36 PM, Donald H Locker wrote: Again, increasing the supply voltage (the V source labelled VHV near the top right of the schematic; it is set to 24V) will increase the motor speed (and, consequently, the commutation frequency.) Changing it to 12V will slow the motor to about half speed; increasing it to 48V will approximately double the motor speed. It is a brushless DC motor - speed is controlled primarily by the supply voltage. Commutation frequency is a function of speed; speed is NOT a function of commutation frequency. The way to change speed is to change the supply voltage; commutation frequency will then also change. Did I mention to change the supply voltage (change it from 24V) to change the motor's speed? Donald. Actually, you CAN control speed with commutation frequency, but only downwards, if you disengage that automatic commutation system normally being used, you can get very tight speed control by using a fixed frequency commutation. You do need to monitor the speed the motor is going because if something does cause it to drop you may need to adjust the commutation to keep it from loosing lock.

Previous Topic Next Topic