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# Measuring Riddle No.4 – Measuring the winding length of a bldc motor

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• #653
Rizwana Bernard

How we measure the winding length of a bldc motor from a given torque?
How we measure the winding length of a bldc motor from a given torque?

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• #2336
Hamid

It seems your means of measuring is computation, however Brushless direct-current motors (BLDCs) are so named because they have a straight-line speed-torque curve like their mechanically commutated counterparts, permanent-magnet direct-current (PMDC) motors. In PMDC motors, the magnets are stationary and the current-carrying coils rotate. Current direction is changed through the mechanical commutation process. These motors are generally used where relatively high rotor inertia is beneficial to system performance. Common applications are computer disk drives and cooling fans. Construction is shown in Figures below. The rotor assembly consists of a flexible magnet with four poles magnetized on it. It is enclosed by a magnetically soft steel cup or housing. A shaft which allows the rotor to turn with respect to the stator is attached to the center of the steel housing. The stator assembly consists of a lamination stack with coils of wire wrapped around the pole pieces. This is supported by a mounting base which also contains a bearing support and a control circuit. This motor

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