Motor system for an electric type vehicle
First Claim
1. A motor system for an electric vehicle, said motor system comprising at least two asynchronous electric motors, each asynchronous electric motor being coupled to a respective wheel of said vehicle and comprising:
- a stator winding for producing a magnetic field turning at a stator frequency in response to an AC supply current supplied to said stator winding by electric supply means at an AC voltage defining a supply frequency;
a rotor magnetically coupled to said stator winding, said rotor rotating at a rotor frequency whose value depends on the value of said turning magnetic field;
said rotor frequency of each of said motors being measured by first measuring means and supplied to electronic measuring-signal processing means forming part of said motor system;
said electronic processing means issuing at a first output, connected to a first input of a control device, a frequency signal which represents, among said measured rotor frequencies, the maximum rotor frequency;
said control device supplying to said electric supply means a first control in response to said frequency signal applied to said control device, said first control signal determining, for each of said motors, a common value for said supply frequency;
said value of said supply frequency defining for said stator frequency of each of said motors a common resulting value; and
said control device being controlled so that said resulting value is greater than the value of said frequency signal having served to regulate said resulting value when said motor system is activated in a drive mode.
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Accused Products
Abstract
The invention concerns a motor system of an electric type vehicle, comprising at least two asynchronous electric motors (M1, M2) supplied in parallel by a central electric supply. This central electric supply is controlled by a control device supplying thereto a first control signal (SCF) determining the value of the supply frequency (FAL) and a second control signal (SCA) determining the value of the supply amplitude (UAL) of the supply voltage. These first and second control signals are regulated essentially in dependence upon a signal (SMI) which is a measurement of the principal supply current (IAL), an instruction signal (SCS) and a signal (SFMX) representing the maximum value of the rotational frequency of the rotors (R2, R2) of said motors.
27 Citations
16 Claims
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1. A motor system for an electric vehicle, said motor system comprising at least two asynchronous electric motors, each asynchronous electric motor being coupled to a respective wheel of said vehicle and comprising:
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a stator winding for producing a magnetic field turning at a stator frequency in response to an AC supply current supplied to said stator winding by electric supply means at an AC voltage defining a supply frequency; a rotor magnetically coupled to said stator winding, said rotor rotating at a rotor frequency whose value depends on the value of said turning magnetic field;
said rotor frequency of each of said motors being measured by first measuring means and supplied to electronic measuring-signal processing means forming part of said motor system;
said electronic processing means issuing at a first output, connected to a first input of a control device, a frequency signal which represents, among said measured rotor frequencies, the maximum rotor frequency;
said control device supplying to said electric supply means a first control in response to said frequency signal applied to said control device, said first control signal determining, for each of said motors, a common value for said supply frequency;
said value of said supply frequency defining for said stator frequency of each of said motors a common resulting value; and
said control device being controlled so that said resulting value is greater than the value of said frequency signal having served to regulate said resulting value when said motor system is activated in a drive mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification