Method for driving motors and apparatus for driving motors
AssigneeSankyo Seiki Mfg. Co., Ltd.
InventorHayato Naito
Life of this patent
Estimating the term…
Abstract
A method is provided for driving a motor apparatus having a first motor, a second motor, and a motor power supply commonly used for the first motor and the second motor. The first motor is a brushless motor. An electrical power is supplied from the motor power supply to driving circuits of the first motor and the second motor through a common motor power supply line. The first motor is driven by a direct PWM driving method, and the second motor is driven by a method different from the direct PWM driving method. A reverse regeneration current generated in the first motor is flown to the second motor through the common motor power supply line.
Claims14
A method for driving a motor apparatus having a first motor, at least one second motor, a motor power supply commonly used for the first motor and the second motor, wherein the first motor is a brushless motor, the method comprising:
- supplying electrical power from the motor power supply to driving circuits of the first motor and the second motor through a common motor power supply line;
- driving the first motor by a direct PWM driving method;
- driving the second motor by a method different from the direct PWM driving method;
- and
- flowing a regeneration current generated in the first motor to the second motor through the common motor power supply line;
- wherein the direct PWM driving method comprises:
- turning on and off a power transistor for the first motor that switches a current conducting through a driving coil of the first motor for each phase in a cycle shorter than a current conduction switching cycle;
- and
- directing the regeneration current caused by a back electromotive force generated by the driving coil of the first motor daring an off-period when the power transistor is turned off to a driving circuit of the second motor.
A method for driving a motor apparatus having a first motor, at least one second motor, a motor power supply commonly used for the first motor and the second motor, wherein the first motor is a brushless motor, the method comprising:
- supplying electrical power from the motor power supply to driving circuits of the first motor and the second motor through a common motor power supply line;
- driving the first motor by a direct PWM driving method;
- driving the second motor by a method different from the direct PWM driving method;
- and
- flowing a regeneration current generated in the first motor to the second motor through the common motor power supply line;
- wherein, when the first motor undergoes a shift to a reverse brake mode when the second motor is stopped, the second motor is started in synchronism with the shift to the reverse brake mode.
A motor driving apparatus for driving a first motor and at least one second motor wherein the first motor is a brushless motor, the motor driving apparatus comprising:
- a motor power supply commonly used for the first motor and the at least one second motor;
- a first motor driving circuit that drives the first motor by a direct PWM driving method;
- a second motor driving circuit that drives the at least one second motor by a driving method different from the direct PWM driving method;
- and
- a control circuit that directs a regeneration current generated in the first motor to the second motor driving circuit through the common motor power supply line;
- wherein the control circuit directs the regeneration current generated in the first motor during an off-period when a power transistor for the first motor is turned off.
A motor driving apparatus for driving a first motor and at least one second motor wherein the first motor is a brushless motor, the motor driving apparatus comprising:
- a motor power supply commonly used for the first motor and the at least one second motor;
- a first motor driving circuit that drives the first motor by a direct PWM driving method;
- a second motor driving circuit that drives the at least one second motor by a driving method different from the direct PWM driving method;
- and
- a control circuit that directs a regeneration current generated in the first motor to the second motor driving circuit through the common motor power supply line;
- wherein, when the first motor undergoes a shift to a reverse brake mode while the second motor is stopped, the control device forcefully starts the second motor in synchronism with the shift to the reverse brake mode.
Dependencies are inferred from the claim text.