What is the controller’s output voltage at the time of starting the BLDC motor? Similar to a conventional DC motor does these motors require additional starters to limit the starting current?
1. In any motor Vapplied = speed voltage + transformer voltage(transient mainly)+vimpedance drop.
2 At starting ,usually to limit current, reduced voltage is applied keeping flux constant. . The important intuition is Torque = K *Iarmature*airgapFlux , both have to be limited as per rated/permissible conditions.
3.So at starting (speed=0 ) in above eqn 1. Consequently speed voltage component is zero but other two are needed.
4. Please see attached pdf ...might help you
Good Luck
Cheers
Cheers
Hi Pavithra,
You can find accessible informations in this related Wikipedia page, especially on reduced voltage starters:
https://en.wikipedia.org/wiki/Motor_controller#Types_of_motor_controller
What level of details do you need? Ask for more if necessary.
Dear Pavitra
In almost all the motors it is the back EMF produced by the motor that decides the armature current apart from load.Hence small motors does not need starters because, they can pickup speed instantly due to their less shaft and armature weight but,as the motor size increases it needs additional starters to limit the current .
Best regards
vasanth
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