An apparatus can include a fan including a control pin. The fan may receive a pulse width modulated (PWM) signal at the control pin. The fan may further control a speed of the fan based on a duty cycle of the PWM signal when the PWM signal is in a first range and, responsive to the duty cycle of the PWM signal being in a second range, transmit information corresponding to the fan to an external controller.

An apparatus can include a fan including a control pin. The fan may receive a pulse width modulated (PWM) signal at the control pin. The fan may further control a speed of the fan based on a duty cycle of the PWM signal when the PWM signal is in a first range and, responsive to the duty cycle of the PWM signal being in a second range, transmit information corresponding to the fan to an external controller.

An electric working machine in one aspect of the present disclosure includes a motor and a controller. The motor is configured to be electrically coupled to a battery pack and to be driven with electric power from the battery pack. The controller is configured to acquire an internal resistance information of the battery pack and to change control of the motor based on the internal resistance information acquired.

The invention relates to the actuation of an electric machine with a change between time-synchronous PWM clocking and angle-synchronous block clocking It is proposed to provide an angle-synchronous clocking with adjustable voltage indicator length for the transition. In this way, jumps in the operating behavior of the electric machine can be minimized or optionally prevented completely during a change between time-synchronous clocking and angle-synchronous clocking.

The purpose of the invention is a method for controlling a three-phase electrical machine from an inverter. Each sector of the complex representation of the space vector modulation being subdivided into three subsectors, comprising a central subsector centred on the active vector, a first lateral subsector associated with the first zero-sequence vector, and a second lateral subsector, opposite the first lateral subsector relative to the central subsector, associated with the second zero-sequence vector, it comprises a step of control of the voltage at the terminals of each phase of the electrical machine, measured relative to neutral, with the value defined by the control vector associated with the subsector in which the control vector is located.

A current control circuit for controlling a drive current supplied to an inductive load is provided. The current control circuit is configured to perform a first mode of controlling a duty of the drive current so as to be 100% until a current value of the drive current reaches a first target current value after a supply of the drive current is started, and a second mode of controlling the duty of the drive current to be a predetermined duty below 100% until the current value of the drive current reaches a second target current value that is greater than the first target current value after the current value of the drive current reaches the first target current value.

A power converter control device performs PWM control for power converters which respectively supply power to a plurality of winding groups of a multiplex-winding electric motor including the plurality of winding groups, the power converter control device including a PWM control unit which performs control while selectively switching among an asynchronous PWM control mode using a carrier not synchronized with voltage commands for respective winding groups and both or one of a first synchronous PWM control mode in which voltage commands for respective winding groups are subjected to PWM control using a carrier synchronized with a voltage command for a specific winding group, and a second synchronous PWM control mode in which voltage commands for respective winding groups are subjected to PWM control using respective carriers synchronized with the respective voltage commands.

An electric working machine in one aspect of the present disclosure includes a motor and a controller. The motor is configured to be electrically coupled to a battery pack and to be driven with electric power from the battery pack. The controller is configured to acquire an internal resistance information of the battery pack and to change control of the motor based on the internal resistance information acquired.

A method of controlling a drive including one respective inverter associated with each of a plurality of servomotors in a robot. The method includes providing a PWM frequency corresponding to a frequency of switching instances for respective semiconductor switches in each of the inverters, whereby for each inverter time is divided into consecutive control cycles forming a sequence of control cycles of the inverter, each control cycle containing two, and only two, of the switching instances for each of the semiconductor switches. The method also includes spreading the respective control cycle sequences of the inverters over time such that the control cycles of each inverter are time shifted in respect to the control cycles of each of the other inverters in the power converter.

Two inverters provided at both ends of each open-end winding, respectively, are appropriately controlled. A rotating electrical machine control device (1) that has at least two control schemes among pulse width modulation control, active short-circuit control, and rectangular-wave control, as control schemes for a first inverter (11) and a second inverter (12), and that can control the first inverter (11) and the second inverter (12) by control schemes which are independent of each other considers one of the plurality of control schemes as a first control scheme and one of the plurality of control schemes different than the first control scheme as a second control scheme, and has a control mode in which the first inverter (11) is controlled by the first control scheme and the second inverter (12) is controlled by the second control scheme.