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Reference.org
DC injection braking
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<p>DC injection braking is a method of slowing <a href="/facts/AC_motor/9RkMe7NV">AC electric motors</a>. <a href="/facts/Direct_current/r9MNUx84">Direct Current</a> is injected into the winding of the AC motor after the AC voltage is disconnected, providing braking force to the rotor. </p>