A control circuit includes: a converter configured to convert alternating current (AC) power into direct current (DC) power, an inverter configured to generate driving power of at least one motor using the converted DC power, and a first core formed by winding a coil by a number of windings determined in correspondence with an impedance of the at least one motor. The number of windings is determined such that an impedance of the first core is inversely proportional to the impedance of the at least one motor and a driving power line for driving the at least one motor passes through a center of the first core.

A stator of a rotating electrical machine has a slot-less structure. The rotating electrical machine includes a controller. The controller determines a value of a q-axis command current in accordance with requirement information and an input command value for a controlled variable of the rotating electrical machine. The requirement information includes a relationship between values of the q-axis command current and corresponding command values for the controlled variable. The controller performs a task of correcting the value of the q-axis command current to thereby restrict temperature change in a magnet unit from having an influence on the relationship between the command values for the controlled variable and the corresponding values of the q-axis command current. The controller controls an inverter to thereby adjust a value of the q-axis current flowing through an armature winding member to the corrected value of the q-axis command current.

A servo amplifier selection device includes: an amplifier group allocation section configured to allocate each of a plurality of motors to any one of a plurality of amplifier groups based on an amplifier group number; a total rated output calculation section configured to calculate, for each of the plurality of amplifier groups, a total value of rated outputs of the motors allocated to the amplifier group; a common power source selection section configured to, for each of a plurality of common power sources, selects the common power source that has a magnitude of the power source capacity satisfies a condition of being equal to or greater than the total value of each of the plurality of amplifier groups; and a display control section configured to get the selected common power source to be displayed in a display unit for each of the plurality of amplifier groups.

A multi-motor system includes motor assemblies, each including a motor, a communication circuit to receive a command transmitted from outside, a control circuit to generate a control signal that rotates the motor with a controlled variable that is designated by the command; and a motor driving circuit that causes a current to flow in the motor based on the control signal. The command includes control data indicating the controlled variable of the motor in fixed data length, the controlled variable being expressed at least with an integer, and position-designating data designating a position of the radix point in the control data. The position-designating data is independently determined for each motor assembly.

A motor assembly includes a motor, a control circuit to generate a control signal, a motor driving circuit to cause a current to flow in the motor based on the control signal, a storage to store a first identifier uniquely identifying itself and a second identifier uniquely identifying another motor assembly within the communications network, and a communication circuit. The communication circuit transmits a data frame, in which the first identifier indicates a transmitting end, the second identifier indicates a receiving end, and a request are stored. The communication circuit receives from the other motor assembly a data frame including the second identifier indicating a transmitting end, the first identifier indicating a receiving end, and a request. In response the communication circuit transmits a data frame including the second identifier indicating a receiving end added thereto and the first identifier indicating a transmitting end added thereto.

An electrical current flowing in a selected one of a plurality of electric motors (51, 52, 53) connected to and supplied from a power supply, wherein a current measuring device (46) is arranged in a connection between the power supply and the plurality of electric motors, is determined. Non-selected electric motors are controlled to be temporarily disconnected from the power supply, and then a current measurement is performed by the current measuring device, while the non-selected electric motors are temporarily disconnected from the power supply. Thus, this current measurement is indicative of the electrical current flowing in the selected electric motor. When the current measurement has been performed, the non-selected electric motors are again controlled to be reconnected to the power supply. In this way, the current drawn by individual motors can be determined with the use of only one current measuring device, so that additional costs can be avoided.

An amplifier selection device includes: a characteristic data storage configured to store a database including respective characteristic data of a plurality of motors, amplifiers, and common power sources; a motor selector configured to display a list of identification information of the motors and select a motor; an amplifier selector configured to display a list of identification information of the amplifiers and select an amplifier; a common power source selector configured to display a list of identification information of the common power sources and select a common power source; a display configured to display a combination of the motor, the amplifier, and the common power source; and a determiner configured to determine whether a relation of the characteristic data satisfies first and second conditions, and when at least one of the conditions is not satisfied, the display clarifies a combination which fails to satisfy the first or second condition.

An amplifier selection device includes: a characteristic data storage configured to store a database including respective characteristic data of a plurality of motors, amplifiers, and common power sources; a motor selector configured to display a list of identification information of the motors and select a motor; an amplifier selector configured to display a list of identification information of the amplifiers and select an amplifier; a common power source selector configured to display a list of identification information of the common power sources and select a common power source; a display configured to display a combination of the motor, the amplifier, and the common power source; and a determiner configured to determine whether a relation of the characteristic data satisfies first and second conditions, and when at least one of the conditions is not satisfied, the display clarifies a combination which fails to satisfy the first or second condition.

Aspects of the technology employ synchronized arrays of low-cost, readily available vibration actuators to emulate and outperform single actuator systems, bringing together sets of actuators to create desired control effects. This approach involves coherent phase switching and modulation of a linear actuator array. A pair of linear resonant actuators (LRAs) may be employed for improved haptic waveform synthesis performance. According to one feature, energy may stored in the mechanical inertia of the LRA via velocity and stiffness of the LRA via displacement and released through modulation of the relative phase of the LRAs. Phase switching and modulation techniques may be used to control more than two LRAs, and in other arrangements than a dual LRA, including, but not limited to architectures that have LRAs arranged in multiple directions in a array spanning, for example, the two dimensions of a plane, or three dimensions of physical space.

An aircraft power plant comprising multiple electric drivetrains combined through a single output shaft, wherein each drivetrain is completely separate from the other, containing individual power sources, motor controllers, and motors, wherein the motors could be selected to provide efficient direct drive to the propulsor at the target propulsor RPM, to facilitate combining multiple motors on the same shaft without requiring mechanical gearboxes. During normal operation, each drivetrain will be operating below their maximum output levels, extending the durability of the motor controllers and motors.