# US 4,395,666 A · D.C. Series excited traction motor capable of operating with a continuous current power supply

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- Number: US 4,395,666 A
- Document ID: US4395666A
- Status: Granted
- Kind: A
- Application number: 06/247,341
- Filed: 1981-03-25
- Granted: 1983-07-26
- Earliest claimed: 1980-03-26
- Assignees: Societe CEM Compagnie Electro-Mecanique & Cie SNC
- Inventors: N'Guyen U. Thuy
- Web page: https://patentgrep.com/patent/US4395666A

## CPC

- H02P 7/298: controlling armature and field supplies
- B60L 2200/26: Rail vehicles
- Y02T 10/64: Electric machine technologies in electromobility
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

This invention pertains to a direct current, series excited traction motor, the armature coil of which is connected in series with the field coil and a smoothing coil, and the power supply of which is adjusted by a current chopper. The inductor includes, in addition, a shunting device for reduction of excitation, and a free wheeling diode is in parallel with the motor and the smoothing coil. This device is unique in that the field coil is divided into at least two series connected partial coils to generate additive flux, one of them only being provided with the shunting device. The chopper is advantageously of a type which may operate in a continuous conduction mode.

## Claims

### Claim 1

A direct current, series excited traction motor circuit, comprising:
an armature coil;
first and second field coils connected in series with said armature coil and with each other to generate additive magnetic flux;
a smoothing coil connected in series with said armature and field coils;
a diode connected in parallel with the series connection of said armature, field and smoothing coils;
a current shunting device connected in parallel with said first field coil for controlling a shunt current to progressively reduce the field flux generated by said first field coil; and
a current chopper for controlling the supply of direct current to said coils.

### Claim 2 (depends on 1)

The motor circuit of claim 1 wherein said current chopper is capable of operating in a continuous conduction mode.

### Claim 3 (depends on 2)

The motor circuit of claim 2 wherein said current shunting device includes means for regulating the total field flux.

### Claim 4 (depends on 6)

The motor circuit of claim 6 wherein said regulating means is a thyristor connected in series with said current chopper.

### Claim 5 (depends on 3)

The motor circuit of claim 3 wherein said regulating means operates independently of said current chopper.

### Claim 6

A direct current, series excited traction motor circuit, comprising:
an armature coil;
first and second field coils connected in series with said armature coil and with each other to generate additive magnetic flux;
a smoothing coil connected in series with said armature and field coils;
a diode connected in parallel with the series connection of said armature, field and smoothing coils;
a current chopper for controlling the supply of direct current to said coils; and
a current shunting device connected in parallel with said first field coil to regulate the total field flux, said shunting device operating to conduct current with the same operating frequency as said current chopper and to block shunt current when said current chopper is not conducting.

### Claim 7

A direct current, series excited traction motor circuit, comprising:
an armature coil;
first and second field coils connected in series with said armature coil and with each other to generate additive magnetic flux;
a smoothing coil connected in series with said armature and field coils;
a diode connected in parallel with the series connection of said armature, field and smoothing coils;
a current chopper connected in parallel with said first field coil; and
a current chopper for controlling the supply of direct current to said coils.

### Claim 8

A direct current, series excited traction motor circuit, comprising:
an armature coil;
first and second field coils connected in series with said armature coil and with each other to generate additive magnetic flux;
a smoothing coil connected in series with said armature and field coils;
a diode connected in parallel with the series connection of said armature, field and smoothing coils;
a plurality of resistances connected in parallel with said first field coil and one another, each resistance being provided with a series connected switch; and
a current chopper for controlling the supply of direct current to said coils.