Electric control system for driving an electric vehicle including first and second converters

• US 3,889,127 A
• Filed: 03/22/1974
• Issued: 06/10/1975
• Est. Priority Date: 06/19/1971
• Status: Expired due to Term

• Current Assignee: Fukuo Shibata
• Original Assignee: Fukuo Shibata
• Inventors: Shibata, Fukuo
• Primary Examiner(s): Simmon, G. R.
• Application Number:
  US05/453,892
• Time in Patent Office: 445 Days
• Field of Search: 290/14,17,50 318/49,139,197 307/47 321/31,28 180/65
• US Class Current: 290/14
• CPC Class Codes: B60L 50/00 Electric propulsion with power supplied within the vehicle with power supply from force of nature, e.g. sun or wind, B60L8/00; for monorail vehicles, suspension vehicles or rack railways B60L13/00
• CPC Class Codes: H02P 7/34 using Ward-Leonard arrangements
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility

Abstract

An electric motor for driving a wheel of a vehicle is arranged to be supplied with electric power from an electric source of an electric battery group in series with an alternating current generator driven by a prime mover. The output terminals of the alternating current generator are connected with two sets of converters one of which is connected in series with the series connection of the electric battery group and the electric motor and the other of which is connected in parallel with the electric battery group. The electric motor can thereby be controlled easily over a wide speed range.

Claims

1. An electric control system for driving an electric vehicle having at least one wheel, said system comprising:

a. alternating current electric generator means which has output terminals;

b. prime mover means for driving said electric generator means;

c. first electric motor means, having input terminals, for driving said wheel of the vehicle;

d. an electric battery which has output terminals connected electrically with the input terminals of said first electric motor means and with the output terminals of said electric generator means;

e. a first converter composed of controlled rectifiers and having A.C. side terminals connected electrically with the output terminals of said electric generator and D.C. side terminals connected electrically in series with the input terminal of said first electric motor and the output terminals of said electric battery;

f. control means connected to vary the turn on point of said controlled rectifiers to operate said first converter as a converter converting A.C. power into D.C. power or as an inverter converting D.C. power into A.C. power thereby controlling the electric generator voltage connected in said circuit with said first electric motor means; and

g. second converter having A.C. side terminals connected electrically with the output terminals of said electric generator and D.C. side terminals connected electrically with the output terminals of the said electric battery;

whereby said first electric motor means is variably supplied with electric power From said electric battery and said electric generator means permitting control of said first electric motor means over a wide speed range.

2. An electric control system as claimed in claim 1 wherein said first electric motor means is a direct current motor;

and wherein the input terminals of said first electric motor, the output terminals of said electric battery means, and the D.C. terminals of said first converter are connected in series circuit.

3. An electric control system as claimed in claim 1 wherein said first electric motor means is an alternating current motor;

said system further comprising a D.C. to A.C. inverter having A.C. terminals connected to the input terminals of said first electric motor means and having D.C. terminals connected in series circuit with the D.C. terminals of said first converter and the output terminals of said electric battery.

4. An electric control system as claimed in claim 1 further comprising a transformer means connected between the output terminals of said alternating current electric generator means and the A.C. terminals of said second converter.

5. An electric control system as claimed in claim 1 wherein said first electric motor means is a wound rotor type induction motor having primary and secondary windings;

said system further comprising a D.C. to A.C. inverter having A.C. and D.C. terminals;

said primary windings being connected to the output of said alternating current generator;

said secondary windings being connected to the A.C. terminals of said inverter; and

a series circuit connection between the D.C. terminals of said inverter, the D.C. terminals of said first converter and the output terminals of said electric battery means.

6. An electric control system as claimed in claim 5 wherein said vehicle has at least a second wheel and wherein said system further comprises a second wound rotor type induction motor for driving said second wheel, said second induction motor having primary and secondary windings;

a second D.C. to A.C. inverter having D.C. and A.C. terminals;

the primary windings of said second induction motor being connected to the output terminals of said alternating current generator;

the secondary windings of said second induction motor being connected to the A.C. terminals of said second inverter; and

the D.C. terminals of said second inverter being connected in parallel with the D.C. terminals of said first inverter.

7. An electric control system as claimed in claim 2 wherein said vehicle has at least a second wheel and wherein said system further comprises a second direct current motor for driving said second wheel, said second direct current motor having input terminals connected in parallel with the input terminals of said first direct current motor.