A locomotive, a first chopper circuit, and a second chopper circuit integrating a traction motor with an energy storage device are disclosed. The locomotive includes a prime mover, an energy management device, a DC power bus, a traction motor, an energy storage device, a resistor grid, and a chopper circuit. Each chopper circuit is controlled by the energy management device and includes a plurality of power semiconductors with variable switching frequency. The traction motor may be capable of operating in a motoring mode, where power is controllably supplied by either the prime mover and/or the energy storage device; and a dynamic braking mode, where generated power is controllably allocated to the energy storage device and/or the resistor grid.

A locomotive, a first chopper circuit, and a second chopper circuit integrating a traction motor with an energy storage device are disclosed. The locomotive includes a prime mover, an energy management device, a DC power bus, a traction motor, an energy storage device, a resistor grid, and a chopper circuit. Each chopper circuit is controlled by the energy management device and includes a plurality of power semiconductors with variable switching frequency. The traction motor may be capable of operating in a motoring mode, where power is controllably supplied by either the prime mover and/or the energy storage device; and a dynamic braking mode, where generated power is controllably allocated to the energy storage device and/or the resistor grid.

A command generation device according to an exemplary embodiment of the present invention includes a command receiving unit that receives a high-level command value related to motion of a motor from a host device, and an internal target generation unit that generates an internal target value of the motor, including a position target value and a rotational speed target value, based on the high-level command value. The internal target generation unit includes a feedback calculator that generates the internal target value corrected based on a difference between the high-level command value and the internal target value, and generates the internal target value corrected in a cycle shorter than a cycle of receiving the high-level command value with the command receiving unit.

The present invention relates to a structure which may include an outer housing, an inner lining, an insulation space in between, a top, an inner platform, a charging station, a wireless charging panel, power-assist wheels with intelligent torque control for transport, a storage compartment, a removable innner liner, and a handle. The structure may comprise a portable container, such as an insulated cooler for storing cooled food and beverages for social and leisure activities.

A system for regulating the power supply of the electric, motor incorporated in an airless paint spray unit so as to enhance the efficiency and performance of the airless paint spray unit. The system includes the utilization in the rector control for the electric motor driving the pump of the airless paint spray unit of an active Power Factor Correction (PFC) switching power supply adapted to regulate the electrical power supplied to the motor.

A system for regulating the power supply of the electric, motor incorporated in an airless paint spray unit so as to enhance the efficiency and performance of the airless paint spray unit. The system includes the utilization in the rector control for the electric motor driving the pump of the airless paint spray unit of an active Power Factor Correction (PFC) switching power supply adapted to regulate the electrical power supplied to the motor.

A DC motor control device includes a communication circuit configured to receive a control command specifying a target rotation amount for a DC motor, a sensor interface configured to receive a detection signal from a rotational angle sensor that outputs the detection signal every time the DC motor rotates by a certain rotational angle, a step counter that outputs a count signal every time the detection signal has been received a certain number of times, a controller that, based on the number of times the count signal received, determines a step count representing the total amount of rotation, and generates a control signal that controls the DC motor in accordance with the step count and the target rotation amount, and a drive signal generation circuit that generates a drive signal that rotates the DC motor in accordance with the control signal.

The present subject matter is directed to a system and method for improving speed control of a pitch drive system of a wind turbine. In one embodiment, the pitch drive system includes a direct current (DC) motor having an armature and a series-field winding, a battery assembly having a positive terminal and a negative terminal, and a current-controlling device configured in series between the positive terminal of the battery assembly and the series-field winding. The battery assembly is configured to supply power to the pitch drive system and the current-controlling device is configured to supply current to the series-field winding so as to ensure a field flux does not equal zero. Thus, the current-controlling device has the effect of limiting the maximum speed of the DC motor.

The present subject matter is directed to a system and method for improving speed control of a pitch drive system of a wind turbine. In one embodiment, the pitch drive system includes a direct current (DC) motor having an armature and a series-field winding, a battery assembly having a positive terminal and a negative terminal, and a current-controlling device configured in series between the positive terminal of the battery assembly and the series-field winding. The battery assembly is configured to supply power to the pitch drive system and the current-controlling device is configured to supply current to the series-field winding so as to ensure a field flux does not equal zero. Thus, the current-controlling device has the effect of limiting the maximum speed of the DC motor.

A command generation device according to an exemplary embodiment of the present invention includes a command receiving unit that receives a high-level command value related to motion of a motor from a host device, and an internal target generation unit that generates an internal target value of the motor, including a position target value and a rotational speed target value, based on the high-level command value. The internal target generation unit includes a feedback calculator that generates the internal target value corrected based on a difference between the high-level command value and the internal target value, and generates the internal target value corrected in a cycle shorter than a cycle of receiving the high-level command value with the command receiving unit.