초록 ▼

A dynamoelectric machine having a multiple of three poles and a corresponding multiple of three brushes is disclosed. Each of the poles are wound poles, two of each group of three poles being excited with a constant excitation during normal operation, the third of each group of poles being a control

A dynamoelectric machine having a multiple of three poles and a corresponding multiple of three brushes is disclosed. Each of the poles are wound poles, two of each group of three poles being excited with a constant excitation during normal operation, the third of each group of poles being a control pole, excited so as to produce a flux that both varies in magnitude and reverses in polarity. With an input voltage connected to first and second brushes of each group of three, an output voltage may be derived from first and third brushes in a magnitude determined by the polarity and intensity of the field of the control pole. The machine is also adapted to provide mechanical output power from its rotating shaft, and also to accept input power from its rotating shaft. The output voltage obtainable may be varied between zero and the value of the input voltage, and also increased above the input voltage, and decreased below zero, reversing polarity. Means are also disclosed for providing regenerative braking of a motor driven by the output voltage of the machine and returning power to a battery power supply without increasing shaft speed of the machine, by augmenting the flux of a pole to increase the input voltage while maintaining the output voltage constant.

대표청구항 ▼

1. Electrical control equipment for controlling the power supplied to a load, said equipment comprising in combination a field structure and an armature concentrically related and mounted for relative rotation one with respect to the other, said field structure including one or more sets of poles wi

1. Electrical control equipment for controlling the power supplied to a load, said equipment comprising in combination a field structure and an armature concentrically related and mounted for relative rotation one with respect to the other, said field structure including one or more sets of poles with each set consisting of a first, a second and a third pole, all of said poles being equidistantly spaced circumferentially around said field structure, a commutator connected to said armature and engaged by sets of brushes, with each set consisting of a first, a second and a third brush, corresponding respectively to said first, second and third pole, there being a set of brushes for each set of poles, said brushes being equidistantly spaced circumferentially with respect to said commutator, said first and second brushes being provided with means for establishing connection with respective terminals of a source of electrical power, said first and third brushes being provided with means for establishing connection to respective terminals of said load for furnishing electrical power thereto, there being at least one excitation winding on each of said poles, means connected to said excitation windings on said first and second poles for coupling said last mentioned windings to a source of energization for establishing first and second poles of fixed and opposite magnetic polarity, and said windings on said third poles are provided with means for changing the field current in said windings from excitation of one polarity to excitation of the opposite polarity and through all excitation levels inbetween, to change the voltage delivered to said load. 2. Electrical control equipment according to claim 1, characterized in that said poles in each set of poles are spaced 120 electrical degrees apart. 3. Electrical control equipment according to claim 1, characterized in that said second poles are provided with additional windings, and means are provided coupled to said additional windings for supplying a current thereto in a direction to augment the magnetic field established by said second poles as a function of the current flowing through said third brushes. 4. Electrical control equipment according to claim 3, characterized in that said third poles are provided with additional windings, and means are provided coupled to said additional windings on said third poles for supplying a current thereto in a direction to diminish the magnetic field established by said third poles as a function of the current flowing through said second brushes. 5. Electrical control equipment according to claim 1, characterized in that said first poles are provided with additional windings, means are provided coupled to said additional windings on said first poles for supporting a current thereto in a direction to diminish the magnetic field established by said first poles as a function of the current flowing through said third brushes, said third poles are provided with additional windings, and means are provided coupled to said additional windings on said third poles for supplying a current thereto in a direction to augment the magnetic field established by said third poles as a function of the current flowing through said first brushes. 6. Electrical control equipment according to claim 1, characterized in that said first poles are provided with additional windings, means are provided coupled to said additional windings for supplying a current thereto in a direction to augment the magnetic field established by said first poles as a function of the current flowing through said second brushes, said second poles are provided with additional windings, and means are provided coupled to said additional windings on said second poles for supplying a current thereto in a direction to diminish the magnetic field established by said second poles as a function of the current flowing through said first brushes. 7. Electrical control equipment according to claim 1, characterized in that said equipment is provided with mechanical output means and is constructed and arranged to accept input electrical power and to convert said input power into mechanical output power furnished to said mechanical output means, and into adjustable electrical power furnished to said load. 8. Electrical control equipment according to claim 1, characterized in that said equipment is provided with mechanical input means and is constructed and arranged to convert mechanical input received from said mechanical input means into controlled electrical power supplied to said load with excess electrical power being fed back to said source of electrical power. 9. Electrical control equipment according to claim 1, characterized in that said second poles are provided with an additional winding, and means are provided for electrically exciting said additional windings on said second poles when said load feeds back electrical power to said equipment to increase the voltage across said first and second brushes to force power back into said source of electrical power for regenerative braking of said load when said load is an electromechanical device. 10. Electrical control equipment according to claim 9, characterized in that said means for electrically exciting said additional windings on said second poles includes for such additional windings first unidirectional conducting means connected to shunt said additional windings when said equipment delivers power to said load, and second unidirectional conducting means connected in series with said additional windings to permit current to flow through said windings when said load delivers power to said equipment. 11. Electrical control equipment according to claim 1, characterized in that said excitation windings on said second poles are wound with the same number of turns as said excitation windings on said first poles but with conductors of lesser resistance than the conductors of said windings of said first poles, a series resistor is disposed in series with each of said excitation windings of said second poles, and means are provided for shunting each of said series resistors when said load feeds back electrical power to said equipment to increase the voltage across said first and second brushes to force power back into said source of electrical power for regenerative braking of said load when said load is an electromechanical device. 12. Electrical control equipment according to claim 11, characterized in that said means for shunting said series resistors comprises a polarized relay actuated by electrical current flowing to and from said load, said relay being constructed and arranged to close a switch for shunting a respective resistor when current flows from said load to said equipment. 13. Electrical control equipment according to claim 12, characterized in that said polarized relay includes a yoke having two legs surrounding a conductor carrying said current to and from said load, and a relay body, said relay body including a pair of permanent magnets, each of said permanent magnets including pole shoe means, said pole shoe means defining confronting spaced apart field poles facing opposite surfaces of said two legs of said yoke, said relay body including a switch connected to at least one of said resistors and operable by said yoke, said yoke being magnetized with a first polarity when current flows through said conductor to said load and being drawn towards a first one of said magnets, and said yoke being magnetized with a second polarity opposite to said first polarity when current flows through said conductor from said load and being drawn towards the other of said magnets to actuate said switch.