Disclosed herein is an apparatus for controlling an inverter. The apparatus determines the phase of an command voltage in a restart section taking into account the frequency of an input voltage to an electric motor when an input power is reduced below a rated power, the frequency of the input voltage into the electric motor at the time of restarting, a time period for generating a torque, and the phase of the input voltage to the electric motor at the time of the restarting.

Systems and techniques detecting a reverse current are disclosed. An apparatus comprises a switching circuit coupled to a load and a reference node. The switching circuit may be capable of conducting a reverse current from the reference node to the load when a voltage at the load is lower than a voltage at the reference node. A voltage source has a first terminal coupled to the load, a second terminal configured to follow a voltage at the load, and produces a voltage proportional to a voltage drop across the switching circuit. A comparator circuit is coupled to compare a voltage at the second terminal of the voltage source to the voltage at the reference node and configured to indicate when the reverse current has a magnitude greater than a predetermined threshold.

The present invention advantageously provides a motorized roller shade that includes a shade tube, a motor/controller unit and a power supply unit. The motor/controller unit is disposed within the shade tube, and includes a bearing, rotatably coupled to a support shaft, and a DC gear motor. The output shaft of the DC gear motor is coupled to the support shaft such that the output shaft and the support shaft do not rotate when the support shaft is attached to the mounting bracket.

A roll shade system is disclosed. The roll shade system includes a motor configured to remain stationary during operation of the motor, a support shaft supporting the motor wherein the support shaft is configured to remain stationary during operation of the motor, and a roll shade tube configured to be rotatable about the motor and the support shaft during operation of the motor. The roll shade system further includes stationary components including a wiring connector, an input wiring system, a bearing, an antenna, a coaxial cable, a motor controller, a counterbalance spring. The roll shade system also includes rotatable components including a bearing housing and one or more O-rings.

Embodiments of a gas turbine engine actuation system are provided, as are embodiments of a high temperature actuator and methods for the manufacture thereof. In one embodiment, the gas turbine engine actuation system includes an actuated gas turbine engine component and a high temperature actuator, which has a rotor mechanically linked to the actuated gas turbine engine component and a stator surrounding at least a portion of the rotor. The stator includes, in turn, a coil support structure having a plurality of spokes extending radially therefrom. A plurality of pre-formed electromagnetic coils is circumferentially distributed about the coil support structure. Each of the plurality of pre-formed electromagnetic coils is inserted over at least one of the plurality of spokes in a radial direction. The stator further includes an inorganic dielectric material in which each of the plurality of pre-formed electromagnetic coils is at least partially embedded.

An electronic switch controller, an electronic switch control method, an electronic switch and an electronic device are disclosed. The processor comprises voltage-stabilized power supplies, a processor and a driving circuit; the processor is connected between the voltage-stabilized power supplies and a measurement device to receive working parameters of the power supply, a load and the electronic switch measured by the measurement device, read duty cycle parameters matching with the working parameters, calculate a new duty cycle with the duty cycle parameters and the working parameters, adjust the current control signal to a PWM signal having the new duty cycle, and send the PWM signal to the driving circuit; and the driving circuit is connected between the voltage-stabilized power supplies and the load to control the rotation speed of the motor in the load. By reducing the volume of an electronic switch and achieving a long low-speed travel, the disclosure enables the user to work at an accurate working point with an electronic device.

The present disclosure discloses a linear motor system. The system includes a linear motor and a drive module which drives the linear motor to vibrate. The linear motor includes a housing having an accommodating space, a vibrating module accommodated in the accommodating space and an elastic part for supporting the vibrating module in the accommodating space elastically. The drive module includes a drive unit for driving the vibrating module to vibrate and a tuning unit for regulating the resonant frequency of the vibrating module. Moreover, the linear motor system of the present disclosure can meet vibration requirements of various application programs and scenes.

A motor parameter tracking method, which can dynamically track motor parameters includes: exciting, with a voltage excitation signal, a motor to operate, and acquiring at least one actual voltage across two terminals of the motor and an actual current flowing through the motor in an operating state; modelling a voltage error of the motor based on the at least one actual voltage and the actual current to obtain a voltage error function of the motor; and performing iteration on at least one motor parameter based on the voltage error function and a preset iterative step. With the method, the difference between different batches of motors can be adaptively adjusted, and parameter changes caused by a motor temperature, a motor posture and the like can be dynamically tracked. All motor parameters are provided with a same step, which reduces the difficulty of parameter adjustment and the sensitivity of algorithms to parameters.

A motor drive utilizes redundant current feedback to monitor force being produced by a motor and to provide safe limited force producing operation of the motor. A first set of current sensors provides a first current measurement, and a second set of current sensors provides a second current measurement. The two current measurements are provided to two diverse force producing calculations, where each force producing calculation provides a value of the force produced by the motor. The motor drive compares the output of the two algorithms to each other. If the output of the two force producing calculations is the same, within an acceptable band, the controller continues operating as commanded. If the output of the two force producing calculations differs beyond the acceptable band, then the controller may generate a fault message provided back to a central controller, stop operation of the motor, or a combination thereof.

A motor drive utilizes redundant current feedback to monitor force being produced by a motor and to provide safe limited force producing operation of the motor. A first set of current sensors provides a first current measurement, and a second set of current sensors provides a second current measurement. The two current measurements are provided to two diverse force producing calculations, where each force producing calculation provides a value of the force produced by the motor. The motor drive compares the output of the two algorithms to each other. If the output of the two force producing calculations is the same, within an acceptable band, the controller continues operating as commanded. If the output of the two force producing calculations differs beyond the acceptable band, then the controller may generate a fault message provided back to a central controller, stop operation of the motor, or a combination thereof.