Very many DC motors have built-in commutation, meaning that as the motor rotates, mechanical brushes automatically commutate coils on the rotor. |
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Some linear DC motors use a brushless slider that contains an additional set of magnets which activate hall-effect sensors and solid-state switches to commutate the motor windings. |
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In line commutation, advantage of the a.c. supply going through zero value at every half-cycle is taken to commutate the thyristor. |
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The easiest way to know the correct moment to commutate the winding currents is by means of a position sensor. |
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