Why the outrunner motors have higher torque than the inrunner motors?
Differences between an outrunner motor vs inrunner motor Additionally the torque arm is longer for an outrunner motor, as the force is generated further from the centre of rotation. Consequently a larger air gap surface area and a longer torque arm both lead to higher torque.
How is Kv calculated?
The unit for Kv is RPM/V and it can be estimated by dividing the rotation speed of the unloaded motor with the applied voltage.
How do you calculate Kv to RPM?
Kv – RPM Constant To estimate the RPM of a motor, simply multiply the Kv value by the battery voltage. Kv is in units of RPM/Volt.
How many Poles does an outrunner motor have?
Common in runner motors have 2 or 4 magnetic poles. There are some motors containing 6 poles as well. Outrunner motors may have in excess of 6 magnetic poles.
How do brushless outrunner motors work?
A brushless DC motor is essentially flipped inside out, eliminating the need for brushes to flip the electromagnetic field. In brushless DC motors, the permanent magnets are on the rotor, and the electromagnets are on the stator.
Is higher or lower Kv better?
If Kv is like horsepower, then Turns is the physical attribute of a motor. The number of turns indicates how much wire is wrapped inside the motor. A higher turn number means more wire and thus more resistance, resulting in a slower motor. So turns with a lower number means a faster motor.
How is Bldc Kv calculated?
The formula to calculate Kv for a brushed DC motor is to just divide the speed by the generated DC voltage that you measure using your multimeter. Another option for brushless motors is to buy a BL motor tester that will calculate Kv for you.
How do you calculate Bldc RPM?
A reasonable full-load speed for a 60 Hz, four-pole motor would be 1,725 RPM. The slip is the difference between the no-load speed and the full-load speed….Motor RPM Calculation Examples
- (Hz x 60 x 2) / number of poles = no-load RPM.
- (60 x 60 x 2) / 4.
- 7,200 / 4 = 1,800 RPM.
What is Kv electric motor?
Kv describes the RPM (revolutions per minute) a motor does per Volt that is put into it. Generally speaking the more Kv a motor has, the more RPM and more power. For example, a 9000Kv motor would be faster than a 2200Kv motor. If Kv is like horsepower, then Turns is the physical attribute of a motor.
What is a inrunner motor?
The term inrunner refers to an electric motor where the rotor (runner) is inside the stator. The term is in particular used for brushless motors to differentiate them from outrunners that have their rotor outside the stator. The vast majority of electric motors are inrunners.
What is the difference between an inrunner and outrunner motor?
An inrunner motor of equal size to a brushless outrunner motor will have higher Kv. Although different motor wind selections (same size motor with Kv options) provides a decent range, outrunner motors will typically have a lower Kv value. This is key in your selection of a brushless motor to directly fit your application.
Do brushless motors generate more torque than inrunner Motors?
Therefore the brushless motor will generate more torque as a general comparison against an inrunner motor. The relationship ties in with the fact that outrunners do have a lower RPM per volt. The relationship with Kv and torque are inversely proportional. As RPM per volt (Kv) increases, torque of the motor decreases.
What is the advantage of a larger can diameter outrunner?
The larger can diameter of the outrunner allows a higher quantity of magnets to be used in the outer case. More magnets alternating magnetic poles forces the ESC to switch more rapidly slowing down the overall speed as there is more work to be done by the ESC.
Do outrunner motors have a lower kV?
Although different motor wind selections (same size motor with Kv options) provides a decent range, outrunner motors will typically have a lower Kv value. This is key in your selection of a brushless motor to directly fit your application. How does an outrunner produce lower Kv? Well, we already did speak about physical size difference.