When did this tread switch from BLDC to servo motors? That said how exactly does a bldc power supply of a higher rating hurt the bldc motor? If you don't know @MisterBill2 , just say you don't know, no shame in that.

 

When did this tread switch from BLDC to servo motors? That said how exactly does a bldc power supply of a higher rating hurt the bldc motor? If you don't know @MisterBill2 , just say you don't know, no shame in that.

Heating in motors is a challenge in all motors that are driven beyond their ratings. Thus the requirement for accurate evaluation in advance is still in effect.

 

Heating in motors is a challenge in all motors that are driven beyond their ratings.

Again your totally missing the point. A higher rated(amps) power supply has no effect on the heat in the motor. That comes from over loading the motor, any electric motor. Stop and think about it instead of just arguing.

Think about in a car. You have a battery with 800 more or less amps available to the whole car. You then have many small motors in it most drawing under 20 amps. By your reckoning you would need a battery for each motor matching the amps the motors need. Or take another idea, you have an electric drill that draws 5 amps, do you mean it can't be plugged into a 20 amp socket?

 

SB is ignoring the point that a motor controlled by a driver is fed the power that the driver is commanded to deliver, not the power that the motor decides to draw. That means that it is entirely possible to drive the motor far beyond it's ratings with a higher powered driver. So the driver is what determines what the voltage applied to the motor will be, what the drive power will be. And a 1500 watt driver can feed that 45 volt motor over 100 volts, if it is commanded to by the external command signal. It is not one bit like connecting a 5 watt light bulb to a 800 watt battery.

 

You win, I bow to your greater knowledge. Even though you wrong about this when using a BLDC motor, or any motor for that matter.

 

You win, I bow to your greater knowledge. Even though you wrong about this when using a BLDC motor, or any motor for that matter.

If you drive a motor with an electronic driver, the maximum power that the driver can deliver can be applied to the motor. That is the same as connecting a speaker to an audio amplifier. The 200 watt amplifier is easily able to overheat the 10 watt speaker it was connected to.
The 1500 watt BLDC driver system is indeed able to supply 1500 watts to whatever is connected to it, because it can usually provide both a higher output voltage and moore output current to any load connected. Usually a lower power rated motor is set up for less voltage and less current, but if a higher voltage is applied then more current will flow, AND the motor will deliver more mechanical power while it overheats. A bit like plugging a 120 volt drill motor into a 240 volt outlet. The current will be excessive.

 

Normally, any bdsm motor controller uses one or another Hall effect sensor with specified IC. Just look citcuit into the PC fan under the skin.

 

If you drive a motor with an electronic driver, the maximum power that the driver can deliver can be applied to the motor. That is the same as connecting a speaker to an audio amplifier. The 200 watt amplifier is easily able to overheat the 10 watt speaker it was connected to.
The 1500 watt BLDC driver system is indeed able to supply 1500 watts to whatever is connected to it, because it can usually provide both a higher output voltage and moore output current to any load connected. Usually a lower power rated motor is set up for less voltage and less current, but if a higher voltage is applied then more current will flow, AND the motor will deliver more mechanical power while it overheats. A bit like plugging a 120 volt drill motor into a 240 volt outlet. The current will be excessive.

Sure, if you run the controller from a higher voltage than the motor can handle.

But if you run a 48V 500W motor from a 1500W speed controller fed by 48V, not so.

 

Sure, if you run the controller from a higher voltage than the motor can handle.

But if you run a 48V 500W motor from a 1500W speed controller fed by 48V, not so.

Maybe he will believe you, he didn't believe me. There is only one type of motor that doesn't follow the same rules as other motors, and that is the stepper motor. And the reason is that it isn't meant to continuously rotate(though it can). So there is little or no BEMF in the stepper motor, unlike any other electric motor.

 

This is an open source speed controller. Everything you need... HW and SW. http://vedder.se/2015/01/vesc-open-source-esc/