News — Motor

What is the difference between brushless Inrunner and outrunner motor?

Posted by Christina Zhang on

What is the difference between brushless Inrunner and outrunner motor?

Outrunner: The permanent magnets on the outrunner are placed on the rotor and the rotor spins on the outside case. On the inside of the motor are the stator windings which do not rotate, they are fixed in position. For example:  Outrunner Black Sealed Sensored Motors Outrunner Open Cover Sensored Motors Outrunner Sensorless Motors Inrunner: On the outer side of the motor is the case. The case in this situation does not rotate and is fixed. The stator windings are placed on the inside face of the case. When you spin the motor shaft of an inrunner, you are spinning...

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How to test motor KV? Why my tested motor KV is different from the specification?

Posted by Christina Zhang on

How to test motor KV? Why my tested motor KV is different from the specification?

Some notices when test motor KV with VESC? KV must be tested without load. To compatible with different kinds motors,  VESC default parameters for motors are more conservative in the design. If test by VESC, test value would be lower about 5% than actual value. Tested KV will be different under different modes and parameters. Tested value will be higher when test in following situations: with hall sensor, high angle, FOC higher than BLDC, V6 higher than V4.   What is KV? Does higher KV mean faster motor? The KV rating (not to be confused with kilo-volt) is the RPM of the motor (k)...

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