An embodiment relates to a method for operating a three-phase machine including a rotor and a stator connected to a three-phase network. The stator is connected to the three-phase network via a first semiconductor circuit arrangement for forming a first rotational field rotating in a first direction of rotation in the stator and via a second semiconductor circuit arrangement for forming a second rotational field rotating in a direction of rotation opposite to the first direction of rotation in the stator. The three-phase machine further includes a controller. The method includes controlling, via the controller, semiconductors of the first and second semiconductor circuit arrangement to accelerate the rotor by current pulses of both the first rotational field and second rotational field in the first direction of rotation.

A boat lift controller may include a digital switch, a power-isolation relay, and a motor-direction-select relay, together which control a motor. The digital switch may provide power to the power-isolation relay. The power-isolation relay may provide power to the motor-direction-select relay and to the motor. The motor-direction-select relay may control the direction in which the shaft of the motor turns.

A boat lift controller may include a digital switch, a power-isolation relay, and a motor-direction-select relay, together which control a motor. The digital switch may provide power to the power-isolation relay. The power-isolation relay may provide power to the motor-direction-select relay and to the motor. The motor-direction-select relay may control the direction in which the shaft of the motor turns.

A motor includes a stator comprising windings configured to be energized, and a rotor electromagnetically coupled to the stator and configured to turn relative thereto when the stator is energized. The motor also includes a motor controller configured to measure a speed at which the rotor turns, and energize said stator to generate a first torque output at the rotor when the measured speed is below a first threshold. The motor controller is also configured to energize the stator to generate a second torque output at the rotor when the measured speed is at least the first threshold, wherein the second torque output is greater than the first torque output.

A motor includes a stator comprising windings configured to be energized, and a rotor electromagnetically coupled to the stator and configured to turn relative thereto when the stator is energized. The motor also includes a motor controller configured to measure a speed at which the rotor turns, and energize said stator to generate a first torque output at the rotor when the measured speed is below a first threshold. The motor controller is also configured to energize the stator to generate a second torque output at the rotor when the measured speed is at least the first threshold, wherein the second torque output is greater than the first torque output.

A motor includes a stator comprising windings configured to be energized, and a rotor electromagnetically coupled to the stator and configured to turn relative thereto when the stator is energized. The motor also includes a motor controller configured to measure a speed at which the rotor turns, and energize said stator to generate a first torque output at the rotor when the measured speed is below a first threshold. The motor controller is also configured to energize the stator to generate a second torque output at the rotor when the measured speed is at least the first threshold, wherein the second torque output is greater than the first torque output.

A motor includes a stator comprising windings configured to be energized, and a rotor electromagnetically coupled to the stator and configured to turn relative thereto when the stator is energized. The motor also includes a motor controller configured to measure a speed at which the rotor turns, and energize said stator to generate a first torque output at the rotor when the measured speed is below a first threshold. The motor controller is also configured to energize the stator to generate a second torque output at the rotor when the measured speed is at least the first threshold, wherein the second torque output is greater than the first torque output.

To provide a motor control device capable of causing a motor to rotate in any rotation direction, even when leaving the connection state of the motor of a machine tool as standard. A motor control device (10) includes: a coordinate converter (36) as a voltage command output unit that outputs voltage command data instructing a voltage to be applied to a motor (14) based on an external instruction; a voltage command data interchanging unit (38) that outputs by interchanging or not interchanging the voltage command data, based on a setting for interchanging of a phase rotation of the voltage command data; a PWM output unit (40) as an amplifier that drives the motor (14) based on the voltage command data outputted by the voltage command data interchanging unit (38); a current detection unit (42) that detects the electric current flowing through the motor (14) and outputs current feedback data; and a current feedback data interchanging unit (44) that outputs by interchanging or not interchanging the current feedback data based on a setting for interchanging.

To provide a motor control device capable of causing a motor to rotate in any rotation direction, even when leaving the connection state of the motor of a machine tool as standard. A motor control device (10) includes: a coordinate converter (36) as a voltage command output unit that outputs voltage command data instructing a voltage to be applied to a motor (14) based on an external instruction; a voltage command data interchanging unit (38) that outputs by interchanging or not interchanging the voltage command data, based on a setting for interchanging of a phase rotation of the voltage command data; a PWM output unit (40) as an amplifier that drives the motor (14) based on the voltage command data outputted by the voltage command data interchanging unit (38); a current detection unit (42) that detects the electric current flowing through the motor (14) and outputs current feedback data; and a current feedback data interchanging unit (44) that outputs by interchanging or not interchanging the current feedback data based on a setting for interchanging.

To provide a motor control device capable of causing a motor to rotate in any rotation direction, even when leaving the connection state of the motor of a machine tool as standard. A motor control device (10) includes: a coordinate converter (36) as a voltage command output unit that outputs voltage command data instructing a voltage to be applied to a motor (14) based on an external instruction; a voltage command data interchanging unit (38) that outputs by interchanging or not interchanging the voltage command data, based on a setting for interchanging of a phase rotation of the voltage command data; a PWM output unit (40) as an amplifier that drives the motor (14) based on the voltage command data outputted by the voltage command data interchanging unit (38); a current detection unit (42) that detects the electric current flowing through the motor (14) and outputs current feedback data; and a current feedback data interchanging unit (44) that outputs by interchanging or not interchanging the current feedback data based on a setting for interchanging.