MOTOR SPECIFICATION REQUEST WITH GIVEN CONDITIONS

[Ethnan]

Hello Everyone,

Please I need recommendations for the affordable commercial motors to be used, given below specifications and required functionalities.

First Case
1. Torque of inertia weight to be driven(load) and all opposing torque will vary from 1Nm to 4Nm.
2. Constant speed of revolution required for load: 3,000RPM
3. Minimum power of motor: 1,200W
4. Speed sensor is attached to load to send feedback on speed to motor
5. Motor required to automatically adjust power to maintain load speed at 3,000RPM, as the opposing load torque keeps changing
6. It's desirable to be able to start the motor with batteries in 30 seconds, after which switchover to normal supply source is done

Second Case
1. Torque of inertia weight to be driven(load) and all opposing torque will vary from 1Nm to 4Nm.
2. Constant speed of revolution required for load: 1,500RPM
3. Minimum power of motor: 1,000W
4. Speed sensor attached to load to send feedback on speed to motor
5. Motor required to automatically adjust power to maintain load speed at 1,500RPM, as the opposing load torque keeps changing
6. It's desirable to be able to start the motor with batteries in 30 seconds, after which switchover to normal supply source is done

 

[Ethnan]

@itsmoked.
So I will need a 2HP 3phase inverter-charging system for the induction motor. I imagine the cost of this would be high.

Yes, there are lots of DIY BLDC motors, their high speed, upto 50,000RPM , can actually be managed since this depends on applied voltage. My issue with them is their low torque, typically less than 2Nm or less, except for the big and expensive ones.

Does the ESC of BLDCs allow the speed of the motors to be set at a particular value? How do you set the speed of BLDCs?

Yes, BLDCs can be quite expensive, but the cost of inverter and the simplicity of the system design may make it more desirable.

Still thinking....

 

[itsmoked]

BLDCs are run with drives that are very similar to VFDs so turn a knob, write a register, and the drive will spin the motor at that precise speed. On the hobby side the speed controllers are expecting an R/C input and are likely open-loop causing a constant speed with a constant load. If the load changes the speed will slightly change then become stable at the new power point.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[Ethnan]

......write a register, and the drive will spin the motor at that precise speed.

Thanks for the insight.

I do greatly appreciate everyone here.

From my heart, many Thanks! ❤