The device (30) for braking an electric motor comprises a rotor (54) provided with two brushes (50, 51) and a stator comprising at least two half-coils (48, 49) connected in series to the brushes while the motor is nominally activated.

Said device comprises a means (30) for underpowering, e.g. freewheeling, the motor, a means (41, 42, 46) for connecting in series a single half-coil (49) to the rotor brushes and a means for controlling the braking by underpowering the motor until at least one value of a physical quantity reaches a predetermined value and the single half-coil is connected in series to the rotor brushes when the value of a physical quantity reaches the predetermined value.

The device (30) for braking an electric motor comprises a rotor (54) provided with two brushes (50, 51) and a stator comprising at least two half-coils (48, 49) connected in series to the brushes while the motor is nominally activated.

Said device comprises a means (30) for underpowering, e.g. freewheeling, the motor, a means (41, 42, 46) for connecting in series a single half-coil (49) to the rotor brushes and a means for controlling the braking by underpowering the motor until at least one value of a physical quantity reaches a predetermined value and the single half-coil is connected in series to the rotor brushes when the value of a physical quantity reaches the predetermined value.

A drive control device includes: a driver including a circuit and configured to drive a motor; and a controller configured to control the driver. The controller is configured to: in a period other than a stop period during driving of the motor, control the driver by a PWM control of a synchronous rectification type, the stop period lasting for a specified time or longer during the driving of the motor; and in the stop period during the driving of the motor, suspend the PWM control of the synchronous rectification type and control the driver such that the motor is set to a short-circuit brake state or a disconnected state.

A drive control device includes: a driver including a circuit and configured to drive a motor; and a controller configured to control the driver. The controller is configured to: in a period other than a stop period during driving of the motor, control the driver by a PWM control of a synchronous rectification type, the stop period lasting for a specified time or longer during the driving of the motor; and in the stop period during the driving of the motor, suspend the PWM control of the synchronous rectification type and control the driver such that the motor is set to a short-circuit brake state or a disconnected state.

A torque system includes a DC power device, a polyphase electric machine, a contactor pair, a power inverter module (PIM), and a controller. The PIM connects to the power device via the contactor pair and directly connects to the electric machine. The controller executes a method to control a fault response under a fault condition resulting in opening of the contactor pair and a polyphase short condition. The controller calculates a back EMF of the electric machine and transmits switching control signals to semiconductor switches of the PIM to transition from the polyphase short condition to a polyphase open condition only when the calculated back EMF is less than a calibrated value and a voltage rise on a DC side of the PIM is less than a calibrated voltage rise. A vehicle includes the DC power device, road wheels, electric machine, PIM, and controller.

A torque system includes a DC power device, a polyphase electric machine, a contactor pair, a power inverter module (PIM), and a controller. The PIM connects to the power device via the contactor pair and directly connects to the electric machine. The controller executes a method to control a fault response under a fault condition resulting in opening of the contactor pair and a polyphase short condition. The controller calculates a back EMF of the electric machine and transmits switching control signals to semiconductor switches of the PIM to transition from the polyphase short condition to a polyphase open condition only when the calculated back EMF is less than a calibrated value and a voltage rise on a DC side of the PIM is less than a calibrated voltage rise. A vehicle includes the DC power device, road wheels, electric machine, PIM, and controller.

A control device that controls an inverter interposed between a DC power source and an AC rotary electric machine to perform power conversion between DC power and AC power, wherein the inverter includes a plurality of sets of an upper switching element and a lower switching element connected in series with each other between positive and negative electrodes on the DC side and controlled so as to be turned on and off in a complementary manner; and the control device executes short-circuiting processing, in which all the upper switching elements or all the lower switching elements are controlled so as to be turned on, while the AC rotary electric machine is stationary.

An electric working machine comprises a motor, a switch, a drive device, a brake device, and a failure determiner. The switch is configured for operation by a user, has an on-state and an off-state. The drive device is configured to drive the motor in response to the switch being placed in the on-state. The brake device is configured to control deceleration of the motor to a stopped state in response to the switch being placed in the off-state. The failure determiner is configured to monitor deceleration of the motor during controlled deceleration and to determine whether the brake device has failed based on the monitored deceleration.

An electronic device has a method capable of automatically executing angle rotation. A second body is rotatably connected to a first body of the electronic device. A hinge mechanism is disposed between the first body and the second body. The hinge mechanism includes a hinge component, a motor unit, a coupling component and an angle detecting unit. The first body and the second body are connected to the hinge component. The motor unit is electrically connected to a controller of the electronic device. The coupling component is connected between the hinge component and the motor unit. The angle detecting unit is connected to the hinge component or the coupling component to read its rotary angle. The controller drives the motor unit to rotate the hinge component via the coupling component, and the second body can be moved relative to the first body and be fixed at a predetermined position.

A comminuting machine includes a frame, a comminuting rotor coupled to the frame, and a rotary drive coupled to the rotor. The rotary drive including a controller, a multi-phase motor connected to the controller, a set of contactors disposed between the controller and the multi-phase motor for selectively providing driving motive force to the multi-phase motor, and at least one rheostat disposed between the controller and the multi-phase motor, in parallel with the first set of contactors, for selectively providing a stopping resistance to the multi-phase motor to effect frictionless braking of the comminuting rotor, wherein the controller is configured to operate the set of contactors and the at least one rheostat to single phase lines of the multi-phase motor for providing the stopping resistance.