An inverter system for a vehicle includes: an energy storage device configured to store electrical energy, a first inverter including a plurality of first switching elements and configured to convert the electrical energy stored in the energy storage device into alternating-current (AC) electric power, a second inverter including a plurality of second switching elements different from the plurality of first switching elements, a motor configured to be driven by receiving the AC power converted by the first inverter and the second inverter, current sensors disposed between the first inverter and the motor and the second inverters and the motor, respectively, and configured to detect a current input to the motor, and a controller configured to generate a pulse width modulation (PWM) signal for controlling driving of the motor.

An open-close body driving device includes a motor configured to open and close an open-close body included in a vehicle and a controller controlling a movement speed of the open-close body driven by the motor. The controller is configured to move the open-close body at a normal speed based on a vehicle-side operating signal output by operation of an operating switch installed on the vehicle and at a speed lower than the normal speed based on a remote operating signal output by operation of a mobile device. The controller is configured so that in a shutting region having a predetermined dimension from a fully-closed position toward an open side, closing movement of the open-close body based on the remote operating signal is slower than closing movement of the open-close body based on the vehicle-side operating signal.

Gate driver circuit for driving power transistor includes: gate line to be connected to the transistor; source line to be connected to the transistor; first current source sourcing current to the gate line; and second current source sinking current from the gate line, wherein the first current source includes: first reference impedance element connected to power supply line; first reference transistor installed between the first reference impedance element and the gate line; first error amplifier having output connected to gate of the first reference transistor, one input connected to the first reference impedance element, and the other input where first reference voltage is input; and first transistor elements installed between the power supply line and the gate line, and wherein the first current source is switched between a state, in which gate of each first transistor element is connected to the output of the first error amplifier, and OFF state.

Embodiments of the present invention provide a method for controlling compressor braking, a frequency converter and a variable speed compressor. The method includes steps of: determining to brake a compressor, wherein a brake circuit includes three switching units and the three switching units are respectively electrically connected to three phases of windings of a motor of the compressor; actuating two of the three switching units to short-circuit two phases of windings of the motor. The two phases of windings of the motor are short-circuited by controlling the three switching units to generate braking torque, such that the compressor is braked without introducing a DC voltage, and thus the braking energy consumption is reduced. Besides, by turning on only two switches at a time, the switching abrasion is reduced, and the overall service life of the three switching units is effectively improved.

An overload control device for use with a floor machine having an electric motor is disclosed. The overload control device can include a power input and a power output connectable to the electric motor. The device can include a load detector, a current sensor operative to sense a current value supplied to the motor via the power output, and a cutoff relay interconnecting the power input and the power output. The cutoff relay being operative to supply power from the power input to the power output when activated, and interrupt power when deactivated. A controller receives a load present indication from the load detector and activates the cutoff relay if a load is present. The controller receives a current value from the current sensor, determines if the current value is greater than a threshold value, and deactivates the cutoff relay when the current value is greater than the threshold value.

An overload control device for use with a floor machine having an electric motor is disclosed. The overload control device can include a power input and a power output connectable to the electric motor. The device can include a load detector, a current sensor operative to sense a current value supplied to the motor via the power output, and a cutoff relay interconnecting the power input and the power output. The cutoff relay being operative to supply power from the power input to the power output when activated, and interrupt power when deactivated. A controller receives a load present indication from the load detector and activates the cutoff relay if a load is present. The controller receives a current value from the current sensor, determines if the current value is greater than a threshold value, and deactivates the cutoff relay when the current value is greater than the threshold value.

A motor driving apparatus which drives a motor including a plurality of windings corresponding to a plurality of phases, respectively, includes: a first inverter including a plurality of first switching elements and connected to a first end of each of the windings; a second inverter including a plurality of second switching elements and connected to a second end of each of the windings; and a controller obtaining a vector corresponding to a voltage command of the motor by combining switching vectors which cause difference between a common mode voltage of the first inverter and a common mode voltage of the second inverter to be zero and configured to control the plurality of first switching elements and the plurality of second switching elements in a pulse width modulation method based on the obtained vector.

Provided is a drive control device including: a DC voltage source; an inverter configured to switch a switching element, to thereby apply a drive voltage to a rotary electric machine to cause a drive current to flow through the rotary electric machine; and a control unit configured to: control an output voltage of the DC voltage source; and perform control of causing, based on a torque command value for the rotary electric machine, a drive current to flow through the switching element in a first control mode, in which a drive current having a value equal to or smaller than a first current limit value is caused to flow, and a second control mode, in which a drive current having a value larger than the first current limit value is caused to flow.

Drive having a commutated electric motor (10), having a coaxial gearing (20) which is connected to the electric motor (10) and which comprises: an internal gear with an internal toothing (5); a tooth carrier (11) in which there are received a multiplicity of teeth (7) for engagement with the internal toothing, wherein the teeth are mounted so as to be radially displaceable relative to the tooth carrier (11) in the longitudinal direction of the teeth (7); a drive-input element with a profiling (22) for the radial drive of the radially displaceably mounted teeth (7), and having a gearing rotary encoder (30) which is connected to the drive output (25) of the gearing (20), wherein the gearing rotary encoder (30) is arranged and designed to detect a drive-output angular position and to output said drive-output angular position as a drive-output angle signal ().

Drive having a commutated electric motor (10), having a coaxial gearing (20) which is connected to the electric motor (10) and which comprises: an internal gear with an internal toothing (5); a tooth carrier (11) in which there are received a multiplicity of teeth (7) for engagement with the internal toothing, wherein the teeth are mounted so as to be radially displaceable relative to the tooth carrier (11) in the longitudinal direction of the teeth (7); a drive-input element with a profiling (22) for the radial drive of the radially displaceably mounted teeth (7), and having a gearing rotary encoder (30) which is connected to the drive output (25) of the gearing (20), wherein the gearing rotary encoder (30) is arranged and designed to detect a drive-output angular position and to output said drive-output angular position as a drive-output angle signal ().