Brushless motor control device and brushless motor control method
AssigneeHitachi Astemo, Ltd.
InventorMasaki Hano
Life of this patent
Estimating the term…
Abstract
There are provided a brushless motor control device and a brushless motor control method that can suppress occurrence of step-out caused by reverse rotation, in low-speed sensorless control of a brushless motor. The brushless motor control device applies, to a brushless motor, a positive pulse generating torque in a rotation direction of the brushless motor and a negative pulse generating torque in a reverse rotation direction, and detects a rotation direction by using a magnetic saturation voltage generated when the positive and negative pulses are applied. The control device sets an upper limit value to a motor application duty represented by a value obtained by subtracting an application duty of the negative pulse from an application duty of the positive pulse.
Claims17
An apparatus comprising:
- a brushless motor control device applying, to a brushless motor, a positive pulse generating torque in a rotation direction of the brushless motor and a negative pulse generating torque in a reverse rotation direction, and determining a rotation direction by using a magnetic saturation voltage generated when the positive and negative pulses are applied, wherein
- the brushless motor control device sets an upper limit value to a motor application duty represented by a value obtained by subtracting an application duty of the negative pulse applied to the brushless motor, from an application duty of the positive pulse.
A method for controlling a brushless motor, comprising:
- applying, to the brushless motor, a positive pulse generating torque in a rotation direction of a brushless motor and a negative pulse generating torque in a reverse rotation direction, and determining a rotation direction by using a magnetic saturation voltage generated when the positive and negative pulses are applied, the method comprising setting an upper limit value to a motor application duty represented by a value obtained by subtracting an application duty of the negative pulse from an application duty of the positive pulse.
An apparatus comprising:
- a brushless motor control device applying, to a brushless motor, a positive pulse generating torque in a rotation direction of the brushless motor and a negative pulse generating torque in a reverse rotation direction, and determining a rotation direction by using a magnetic saturation voltage generated when the positive and negative pulses are applied, wherein
- the brushless motor control device sets an upper limit value to a motor application duty represented by a value obtained by subtracting an application duty of the negative pulse applied to the brushless motor, from an application duty of the positive pulse,
- in a case of reverse rotation due to load torque the motor application duty is held as the upper limit value,
- during processing of the upper limit value, a calculation value is held by an integrator that is a component of a rotation speed feedback control, and
- in a case that the motor application duty is greater than or equal to the set duty, the motor application duty is determined based on the rotation speed.
Dependencies are inferred from the claim text.