Electric Machine
First Claim
1. An electric machine comprising:
- a stator;
a rotor;
at least two sub-machines, each of the at least two sub-machines having a same number of phases, each of the at least two sub-machines including a portion of stator coils of the stator, each of the at least two sub-machines being configured to generate, independently of each other, a rotating magnetic field to rotate the rotor;
at least two power output stages, each of the at least two power output stages corresponding to a respective one of the at least two sub-machines; and
at least one control unit connected to the at least two power output stages, and configured to generate at least one PWM signal to actuate the at least two power output stages, the at least one control unit being configured to generate the at least one PWM signal such that PWM pulses of the at least one PWM signal for a first sub-machine of the at least two sub-machines each start at a start time of a first PWM period for the first sub-machine.
1 Assignment
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Accused Products
Abstract
An electric machine has at least two sub-machines, each having the same number of phases and being designed to generate a magnetic rotary field independently of one another to rotate the rotor. The machine has a power output stage for each sub-machine, each being designed to energize the sub-machines independently of one another. The machine also has at least one or only one control unit which is connected to the power output stages and is designed to generate a PWM signal in order to actuate the power output stages. The control unit is designed to generate the PWM signal for the sub-machines such that each of the PWM pulses for a sub-machine begins at a starting time of a PWM period and/or to generate the PWM pulses for another sub-machine such that each of the PWM pulses ends at an end time of the PWM period for the other sub-machine.
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Citations
10 Claims
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1. An electric machine comprising:
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a stator; a rotor; at least two sub-machines, each of the at least two sub-machines having a same number of phases, each of the at least two sub-machines including a portion of stator coils of the stator, each of the at least two sub-machines being configured to generate, independently of each other, a rotating magnetic field to rotate the rotor; at least two power output stages, each of the at least two power output stages corresponding to a respective one of the at least two sub-machines; and at least one control unit connected to the at least two power output stages, and configured to generate at least one PWM signal to actuate the at least two power output stages, the at least one control unit being configured to generate the at least one PWM signal such that PWM pulses of the at least one PWM signal for a first sub-machine of the at least two sub-machines each start at a start time of a first PWM period for the first sub-machine. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for actuating an electric machine including at least two sub-machines, each having a same number of stator coils, the method comprising:
generating pulse-width-modulated pulse patterns having a plurality of PWM pulses to actuate the stator coils of each of the at least two sub-machines, PWM pulses of the plurality of PWM pulses for a first sub-machine of the at least two sub-machines each starting at a start time of a first PWM period for the first sub-machine and PWM pulses of the plurality of PWM pulses for a second sub-machine of the at least two sub-machines each ending at an end time of a second PWM period for the second sub-machine. - View Dependent Claims (9, 10)
Specification