Abstract: An electric motor includes a stator, a shaft rotatable with respect to the stator, and a lamination stack mounted on the shaft and having radially extending teeth forming slots therebetween. An end insulator is provided at an end of the lamination stack having forming slots therebetween. Motor coils are wound in the lamination stack slots and the end insulator slots. A fan having blades attached to a fan ring and mounted to an end of the lamination stack. The fan ring includes longitudinally-extending tongues arranged to be mounted at the end of the lamination stack and the end insulator includes longitudinally-extending notches corresponding to the tongues of the fan ring to allow the tongues to be in direct contact with the end of the lamination stack.

Abstract: A control system including a measurement module configured to receive motor measurements that represent operating parameters of plural traction motors of a common vehicle system as the vehicle system propels along a route. The control system also includes an analysis module configured to compare the motor measurements to an expected measurement. The expected measurement corresponds to a designated motor type. The analysis module is configured to determine that at least one of the traction motors is different from the designated motor type based on comparing the motor measurements to the expected measurement.

Abstract: An alternating current-to-direct current (AC-to-DC) power supply has a first stage providing a first DC voltage and a second stage providing a second DC voltage. The AC-to-DC power supply has a first efficiency at the first stage and a second efficiency at the second stage that is less than the first efficiency. The second DC voltage is also less than the first DC voltage. A blower is electrically connected to the first stage of the AC-to-DC power supply to receive the first DC voltage from the AC-to-DC power supply to power the blower. Electrical connection of the blower to the first stage of the AC-to-DC power supply instead of to the second stage of the AC-to-DC power supply wastes less power and is more efficient.

Abstract: The discharge control device for a power conversion system performs discharge control to discharge a capacitor parallel-connected to the input side of the power conversion system including a plurality of pairs of high-side and low-side switching elements connected in series and each controlled by a drive unit, by turning on the high-side and low-side switching elements of one of the pairs at the same time. At this time, the discharge control device inhibits an ON command from being inputted to the drive units for the high-side and low side switching elements of the other pairs.

Abstract: A discharge control device in an electric power conversion system mounted to a motor vehicle turns off a relay in order to instruct an electric power conversion circuit to supply a reactive current into a motor generator, and thereby to decrease a capacitor voltage to a diagnostic voltage. After this process, the discharge control device outputs an emergency discharging instruction signal dis in order to turn on both power switching elements at high voltage side and a low voltage side in the electric power conversion circuit. This makes a short circuit between the electrodes of the capacitor in order to discharge the capacitor, and executes a discharging control to detect whether or not an emergency discharging control is correctly executed and completed. The discharge control device detects whether or not the electric power stored in the capacitor is discharged on the basis of the voltage of a voltage sensor.

Abstract: A method for controlling a rotary electrical machine and a control and power module for a rotary electrical machine. The rotary electrical machine includes a plurality of phase windings (9), a power circuit (12, 16) which comprises a plurality of arms each formed by a bridge of switches and which is capable of supplying an electrical network at an output voltage (Vres) equal to a nominal voltage when the bridge of switches is in a nominal mode of operation, an excitation winding (11) through which flows an excitation current (I exc) which generates a magnetic flux in a magnetic excitation circuit (10), and an electronic control circuit (7) which operates the power circuit and controls the excitation current. The method includes locking the bridge in at least one arm of the power circuit in a conductive state when the output voltage exceeds a voltage threshold higher than the nominal voltage. The nominal mode of operation of the bridge is returned to independently of the output voltage.

Abstract: The present invention includes a control device capable of applying a high voltage to a motor of a fuel pump for an appropriate period of time during a low voltage operation of the motor.

Abstract: Techniques sense a back-emf voltage from a brushed permanent magnet motor. Such techniques can be used for a variety of purposes, such as to estimate the current that is being applied to the motor, to estimate the motor's velocity, position, torque, and the like. One aspect of the invention includes the deactivation of power applied to the motor, and the monitoring of the back-emf of the voltage while power is not applied.

Abstract: A motor controller comprising, a detector configured to perform a difference processing for information relating to a counter electromotive force and an induced electromotive force generated by a stepping motor, and to generate a driving control signal based on a result of the difference processing, and a driver configured to drive the stepping motor based on the driving control signal.

Abstract: In a circuit arrangement for starting a DC motor comprising at least one field winding, particularly for switching on a DC motor for driving a hydraulic fluid pump for operating hydraulic actuators of a vehicle loading platform system, means are provided for switching on at least one field winding and means activatable by the switching on of the at least one field winding for fully activating and starting the DC motor.

Abstract: A motor braking circuit arrangement, for use with a series/universal motor and a power supply for supplying power to the motor, including two separately actuable switches electrically interconnecting a separate braking winding with the motor to effect braking when either of the two switches are deactuated. The circuit arrangement includes a field winding wound about the motor stator and electrically connected in series with the motor armature winding. The separate brake winding is wound about the stator. The two switches are series-connected, and each switch is capable of assuming a first position associated with normal motor operation and a second position associated with motor braking wherein the separate brake winding is electrically connected in parallel with the motor armature. The switches may be single-pole, double-pole or combinations thereof.

Abstract: Disclosed is an improvement to the stability of D.C. motor brushes mounted in brush boxes with wings is improved by angling the wings toward the commutator such that the brush spring contacts the brush at one or more points intermediate the ends of the brush. Improved cooling is provided by utilizing an end plate with apertures and a brush plate which in combination with the commutator, provides a brush plate aperture for cooling air flow. In a preferred embodiment, speed variations of the motor can be achieved by selectively disconnecting one or more brushes in a four brush embodiment reducing the torque and rotating speed of the motor. In a preferred embodiment, the use of a diode to interconnect same polarity brushes permits a speed change to be accomplished by selectively connecting one or the other end of the diode.

Abstract: An improved driving circuit of a series or compound motor includes at least two series excitation field windings, one end of each of the series excitation windings being jointly connected, with the same polarity, to the armature, and at least one set of the series excitation field winding is isolated by means of diodes so as to receive power from different power sources.

Abstract: A compound series motor includes a series field winding, armature, and auxiliary power supply connected in parallel with the series winding. The drop in armature current through the series field winding may be reduced by connecting an auxiliary field winding having the same polarity as the series field winding between the auxiliary power supply and the main power supply connection to the series field winding so as to prevent an excessive rise in running speed during idle load conditions, while a diode may be connected between the auxiliary power supply and the series field winding connection to the armature to prevent armature current losses. The power supply can be operated to supply continuous excitation current to the series field winding, or be controlled relative to the input voltage, the loading current value, or both the voltage and loading current values to provide an assist-type supplemental excitation current to the series field winding.

Abstract: A speed control device for a DC motor includes a voltage maintaining circuit connected between the DC motor and a comparator circuit for maintaining the voltage corresponding to an electromotive force when a pulse wave outputted from a pulse-width extension circuit is at a level for off-operation of a switch element. Additionally, an average voltage maintaining circuit is connected between the DC motor and the comparator circuit and maintains in average the voltage corresponding to the back electromotive force produced in the DC motor during the time when the control pulse signal outputted from the control pulse signal output circuit is not at a level for on-operation of the switch element.

Abstract: A method of controlling and a controller for controlling at least one series motor is provided. Rectifier means is connected in series with the motor so that current through a field winding of the motor is always in the same direction irrespective of the polarity of the input voltage while the current direction through an armature of the motor reverses in accordance with the polarity of the input voltage. An energizing current is applied to the field winding by a bias power supply to ensure that the field winding always produces some flux during operation of the motor.

Abstract: An electric work vehicle with a battery powered traction motor and pump motor is provided with an auxiliary power supply for a load circuit requiring voltage lower than that of the battery. The pump motor is provided with an auxiliary brush at a location between a pair of motor brushes and the auxiliary load circuit is connected between the auxiliary brush and one of the motor brushes. The auxiliary brush is positioned relative to the motor brush so that it supplies the voltage required by the auxiliary load circuit.

Abstract: An automatic speed controller for a universal, series-wound, electrical motor, is part of a system whereby the motor is energized by a A.C. supply from control means including a triac, in turn, controlled by the speed controller. Within the controller signals are derived comprising solutions of the equation: ##EQU1## or a derivative thereof, or an approximation thereof, where N is the armature speed, R.sub.a is the resistance of the armature, K is a constant dependent upon the motor design, (V.sub.a -I.sub.a R.sub.a) is the true average of the alternating quantity (v.sub.a -i.sub.a R.sub.a), where v.sub.a and i.sub.a are, respectively, the instantaneous armature voltage and current, and .0..sub.AV is the true average flux in the magnetic circuit of the motor, both true averages being obtainable when the motor is operating under steady state conditions.

Abstract: In the propulsion system of an electric locomotive, a-c wayside power is converted to direct current for the traction motors by a plurality of phase-controlled rectifying circuits having serially connected outputs. To improve power factor, forced commutation means is provided for turning off the controllable valves in one of the circuits at a desired "extinction angle." This angle is varied with motor speed, but its effective range of variation is restricted so as to avoid undesired leading power factor at low speeds, to optimize power factor when the locomotive is running at full power, and to prevent misoperation when the level of load current is low.

Abstract: An improved electric motor for use in battery powered vehicles wherein the motor is adapted for production of a secondary voltage to sequentially charge batteries used as the power source for powering the vehicle, which motors are adapted to be carried aboard the vehicle and to cyclically function as a means to drive the wheels of the vehicle and then to recharge the batteries used as the power source to drive the motors in operative relationship.