Method for controlling a brushless electric motor
AssigneeMinebea Co., Ltd.
InventorsAndrás Lelkes, Michael Bufe
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for controlling a brushless electric motor for operation within a specified supply voltage range, a motor control controlling the winding voltage by means of pulse width modulation (PWM) and regulating the rotational speed to a specified speed. According to the invention, the motor is so rated that the nominal rotational speed is just achieved at the nominal operating point at the nominal supply voltage and at the maximum PWM ratio.
Claims11
A method for controlling a brushless electric motor for operation within a specified supply voltage range, comprising:
- controlling the winding voltage by means of pulse width modulation (PWM) and regulating the rotational speed of the motor to a specified given value;
- the motor being so rated that a nominal rotational speed is achieved at a nominal operating point at a nominal supply voltage and at a maximum PWM ratio;
- if the supply voltage falls below the nominal voltage, operating the motor at the maximum PWM ratio;
- and
- if the supply voltage exceeds the nominal voltage, regulating the rotational speed to the given value and causing the input power to the motor and the rotational speed to remain constant.
A brushless electric motor for operation within a specified voltage range, comprising:
- a motor control controlling winding voltage by means of pulse width modulation (PWM) and regulating rotational speed of the motor to a given maximum speed;
- the motor being so rated that a nominal rotational speed is achieved at a nominal operating point at a nominal supply voltage and at a maximum PWM ratio;
- if the supply voltage falls below the nominal voltage, the control operating the motor at the maximum PWM ratio;
- and
- if the supply voltage exceeds the nominal voltage, the control regulating the rotational speed to the given value and causing input power to the motor and the rotational speed to remain constant.
Dependencies are inferred from the claim text.