| 摘要 |
The invention provides an electric power steering apparatus in which a dead zone is not generated even at a low duty ratio while slow starting a switching element. When a duty ratio of a PWM control becomes more than a preset value (NO in S 14 ), a switching cycle is set to a predetermined value (a fixed value) (S 20 ). When the duty ratio becomes equal to or less than the preset value (Yes in S 14 ), the switching cycle is made longer than the predetermined value (S 16 ). It is possible to securely apply a current to a motor and it is possible to prevent a dead zone from being generated, by elongating the switching cycle even in a low duty ratio while slow starting an FET and preventing a noise from being generated.
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