A master device (10) of a drive system (1) transmits identification information of each first period and a first transmission synchronization signal for each first period of a reference period including a plurality of first periods or transmits identification information of each first period, a first transmission synchronization signal, and a second transmission synchronization signal for each first period of the reference period. A first controller (31) adjusts a phase of each first control period such that the first control period is synchronized with a timing associated with a specific first synchronization signal out of a plurality of first synchronization signals which are acquired by reception of the first transmission synchronization signal a plurality of times using the identification information and controls a first power converter. A second controller (32) adjusts a phase of each second control period such that the second control period is synchronized with a timing associated with a specific second synchronization signal out of a plurality of second synchronization signals which are acquired by one of reception of the first transmission synchronization signal a plurality of times and reception of the second transmission synchronization signal a plurality of times using the identification information and controls a second power converter.

A master device (10) of a drive system (1) transmits identification information of each first period and a first transmission synchronization signal for each first period of a reference period including a plurality of first periods or transmits identification information of each first period, a first transmission synchronization signal, and a second transmission synchronization signal for each first period of the reference period. A first controller (31) adjusts a phase of each first control period such that the first control period is synchronized with a timing associated with a specific first synchronization signal out of a plurality of first synchronization signals which are acquired by reception of the first transmission synchronization signal a plurality of times using the identification information and controls a first power converter. A second controller (32) adjusts a phase of each second control period such that the second control period is synchronized with a timing associated with a specific second synchronization signal out of a plurality of second synchronization signals which are acquired by one of reception of the first transmission synchronization signal a plurality of times and reception of the second transmission synchronization signal a plurality of times using the identification information and controls a second power converter.

Electric machine drive systems, and related electric machine embodiments, include technologies for providing redundancy of shaft information of one or more electric machines between converter controllers of the corresponding system. The converter controllers are configured to control operation of power converters, which control one or more electric machines. The disclosed technologies include establishing one or more communication buses between the converter controllers to share the shaft information, which may be based on analog signals from a single, common resolver and/or from different, redundant resolvers depending on the embodiment. For example, in some embodiments, converter controllers communicatively connected to the same resolver may include separate resolver-to-digital converters (RDCs) to provide redundancy of the RDCs.

A first input coupling and a second input coupling are coupled to rotatably drive an output coupling at the same time. In one embodiment, the output coupling rotates a robotic surgery endoscope about a longitudinal axis of the output coupling. A first motor drives the first input coupling while being assisted by a second motor that is driving the second input coupling. A first compensator produces a first motor input based on a position error and in accordance with a position control law, and a second compensator produces a second motor input based on the position error and in accordance with an impedance control law. In another embodiment, the second compensator receives a measured torque of the first motor. Other embodiments are also described and claimed.

A first input coupling and a second input coupling are coupled to rotatably drive an output coupling at the same time. In one embodiment, the output coupling rotates a robotic surgery endoscope about a longitudinal axis of the output coupling. A first motor drives the first input coupling while being assisted by a second motor that is driving the second input coupling. A first compensator produces a first motor input based on a position error and in accordance with a position control law, and a second compensator produces a second motor input based on the position error and in accordance with an impedance control law. In another embodiment, the second compensator receives a measured torque of the first motor. Other embodiments are also described and claimed.

Electric machine drive systems, and related electric machine embodiments, include technologies for providing redundancy of shaft information of one or more electric machines between converter controllers of the corresponding system. The converter controllers are configured to control operation of power converters, which control one or more electric machines. The disclosed technologies include establishing one or more communication buses between the converter controllers to share the shaft information, which may be based on analog signals from a single, common resolver and/or from different, redundant resolvers depending on the embodiment. For example, in some embodiments, converter controllers communicatively connected to the same resolver may include separate resolver-to-digital converters (RDCs) to provide redundancy of the RDCs.

A control device (2) for controlling power supply to a continuous-rotation motor, of the horological, DC type, is arranged to generate electrical pulses with a lower supply voltage to drive the rotor. The number of pulses per time interval is a function of the load applied to the motor. A voltage divider is arranged to supply the lower supply voltage with a plurality of different values and thus the electrical pulses with a variable voltage. A logic circuit counts the numbers of electrical pulses in successive time periods; to periodically select a voltage value, from among a plurality of different values, as a function of a counted number of electrical pulses or of a succession of counted numbers of electrical pulses; and to control the voltage divider so that the latter supplies the lower supply voltage with the selected voltage value after the selection of this voltage value.

A control device (2) for controlling power supply to a continuous-rotation motor, of the horological, DC type, is arranged to generate electrical pulses with a lower supply voltage to drive the rotor. The number of pulses per time interval is a function of the load applied to the motor. A voltage divider is arranged to supply the lower supply voltage with a plurality of different values and thus the electrical pulses with a variable voltage. A logic circuit counts the numbers of electrical pulses in successive time periods; to periodically select a voltage value, from among a plurality of different values, as a function of a counted number of electrical pulses or of a succession of counted numbers of electrical pulses; and to control the voltage divider so that the latter supplies the lower supply voltage with the selected voltage value after the selection of this voltage value.

The disclosure relates to an unmanned aerial vehicle, a motor control device and method for controlling the same. The motor control method includes: acquiring current attitude information of a load, target attitude information of the load and current operation parameter information of one or more motors on the load, and obtaining control information for controlling the one or more motors in accordance with the acquired information above; transmitting the control information to a shared memory for storage; reading the control information from the shared memory, and controlling operation of the one or more motors in accordance with the control information. In one embodiment, the motor control device does not require cable or PCB wiring to connect a main control unit and an execution unit, reducing the size of hardware. Moreover, with the shared memory, the speed and stability of data interaction between the main control unit and the execution unit may be improved.

The disclosure relates to an unmanned aerial vehicle, a motor control device and method for controlling the same. The motor control method includes: acquiring current attitude information of a load, target attitude information of the load and current operation parameter information of one or more motors on the load, and obtaining control information for controlling the one or more motors in accordance with the acquired information above; transmitting the control information to a shared memory for storage; reading the control information from the shared memory, and controlling operation of the one or more motors in accordance with the control information. In one embodiment, the motor control device does not require cable or PCB wiring to connect a main control unit and an execution unit, reducing the size of hardware. Moreover, with the shared memory, the speed and stability of data interaction between the main control unit and the execution unit may be improved.