Abstract: A method of adjusting speed and torque of a dynamoelectric machine is disclosed. The machine includes a main winding, and a divided winding each configured to generate a plurality of poles. The method includes the steps of energizing the main winding and controlling the amount of electromagnetic flux at each pole.

Abstract: A spread adjusting motor for a ceiling fan with coils that distribute an even magnetic field for the fan rotor to eliminate the interval noises from the current. The main feature of the coils is that they use a skip or pass through winding process for the stator coils. The first step is to wind the starter coil continuously for two full slots and then skip two slots until a full round of winding upon the stator is completed. A similar skip winding process is used for each of the speed adjusting coils. Each of the speed coils is wound one full slot after skipping three slots until a full round of winding upon the stator is completed. When the skip winding process is done, the coils are evenly distributed around the stator.

Abstract: A motor control circuit provides series or compound excitation during starting and shunt excitation during normal running. A switch responsive to the motor speed, the armature current, the armature EMF, or the like, includes terminals connected to the series winding and a series winding bypass to permit switching between a compound series and a shunt configuration. In addition, a tap may be provided on the series winding for providing intermediate characteristics, and separate switches for the series and shunt field windings may also be provided.

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: The device comprises inductance coils (6) which are each allocated to one phase and which are wound around a common magnetic core in the same direction and with the same number of windings. One each of the inductance coils (6) is connected to one each of the phase leads (3,5) for supplying the multiphase load (4), the connection being made in series between the converter (1) and the load (4). The load can particularly be a multiphase asynchronous motor.The inductance coils (6) and the magnetic core can be dimensioned equivalent to a power supply transformer adjusted to the frequency and rating of the converter (1), so that deficiencies in the electromagnetic symmetry of the load (4) are balanced, or, on the other hand, they can be dimensioned equivalent to a mains filter adjusted to the frequency and rating of the spikes of converter (1), in order to remove such spikes from the respective phase (3) of the power supply.

Abstract: A novel stator assembly, D.C. electric motor, and method of controlling the speed of the motor is described. The stator assembly includes a pair of field poles, each having a field coil wound around a shank portion, a plurality of separately excitable field control coils wound individually around separate field pole leg members, and a face portion forming a bore for receiving the motor armature. The field poles also have a core portion which provides a magnetic path between the shank and face portion. This core portion permits the magnetic flux in the field poles to shift across the face portion when one or more of the field control coils are energized magnetically subtractive to the flux generated by the field coils. The speed of the motor may be controlled by energizing the field control coils and controlling their polarity with respect to the field coils. A motor controller for the motor according to the present invention is also described, and is particularly useful in an electric vehicle application.

Abstract: A field shunt operation for a chopper controlled series DC propulsion motor in the power mode is provided in response to a desired torque request, when a predicted value of the resulting shunt field motor current is determined to be no greater than the known commutation current limit of the chopper.

Abstract: A novel stator assembly, D.C. electric motor, and method of controlling the speed of the motor is described. The stator assembly includes a pair of field poles, each having a field coil wound around a shank portion, and a plurality of separately excitable field control coils wound individually around the field pole legs defining a face portion of the field poles. The field poles also have a core portion which provides a magnetic path between the shank and face portion. This core portion permits the magnetic flux in the field poles to shift across the face portion when one or more of the field control coils are energized magnetically subtractive to the flux generated by the field coils. The speed of the motor may be controlled by energizing the field control coils and controlling their polarity with respect to the field coils. A motor controller for the motor according to the present invention is also described, and is particularly useful in an electric vehicle application.

Abstract: A switch for speed control of an electric motor driven vehicle employs a combination of resistance switching, field weakening and voltage switching. A mechanical switch assembly has a speed switch and a voltage switch that are interconnected so that the voltage switch provides 36 volts when the speed switch is in neutral and fifth speed position and provides 18 volts when the speed switch is in first through fourth speed positions. The speed switch has an operator controlled rotor arm that successively engages a neutral contact and five driving speed contacts so that varying resistance is inserted in circuit with the motor armature in the first two speed positions and no external resistance is employed in the third and fifth speed positions. The motor field comprises pairs of first and second oppositely disposed series wound coils with the pairs of coils all connected and energized in series in all but the fourth speed position.