In-wheel motor system
First Claim
Patent Images
1. An in-wheel motor system comprising:
- a power transmitter that utilizes a resonance phenomenon using a magnetic field;
a communication interface configured to communicate between a vehicle body and a wheel;
a in-wheel motor;
a motor conversion unit configured to convert a first DC voltage into a motor AC voltage that drives the in-wheel motor during powering;
a wheel side capacitor configured to smooth the first DC voltage during powering;
a wheel side conversion unit configured to convert a first AC voltage from a wheel side coil into the first DC voltage during powering; and
a wheel side controller configured to control, with a first control signal, switching of a switch provided in the wheel side conversion unit;
whereinthe power transmitter comprises;
the wheel side coil, configured to receive wirelessly transmitted power at the wheel side during powering; and
a wheel side resonance capacitor inserted in series between the wheel side conversion unit and the wheel side coil;
the power transmitter transmits power wirelessly from the vehicle body to the in-wheel motor mounted in the wheel;
the communication interface wirelessly transmits a control signal for driving the in-wheel motor; and
the wheel side controller generates the first control signal with the timing at a zero cross point of a current of the wheel side coil as a reference, so as to control the first DC voltage to be constant.
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Abstract
An in-wheel motor system can drive an in-wheel motor stably, and also allows power feeding from the road surface, even when transmission and reception coils are misaligned. An in-wheel motor system (1) includes a power transmitter (100) that utilizes a resonance phenomenon using a magnetic field. The power transmitter (100) transmits power (P) wirelessly from the vehicle body to an in-wheel motor (10) mounted in a wheel. The in-wheel motor system (1) may also include a communication interface (110) that communicates between the vehicle body and the wheel, and the communication interface (110) may transmit a control signal (CTL) for driving the in-wheel motor.
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Citations
11 Claims
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1. An in-wheel motor system comprising:
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a power transmitter that utilizes a resonance phenomenon using a magnetic field; a communication interface configured to communicate between a vehicle body and a wheel; a in-wheel motor; a motor conversion unit configured to convert a first DC voltage into a motor AC voltage that drives the in-wheel motor during powering; a wheel side capacitor configured to smooth the first DC voltage during powering; a wheel side conversion unit configured to convert a first AC voltage from a wheel side coil into the first DC voltage during powering; and a wheel side controller configured to control, with a first control signal, switching of a switch provided in the wheel side conversion unit;
whereinthe power transmitter comprises; the wheel side coil, configured to receive wirelessly transmitted power at the wheel side during powering; and a wheel side resonance capacitor inserted in series between the wheel side conversion unit and the wheel side coil; the power transmitter transmits power wirelessly from the vehicle body to the in-wheel motor mounted in the wheel; the communication interface wirelessly transmits a control signal for driving the in-wheel motor; and the wheel side controller generates the first control signal with the timing at a zero cross point of a current of the wheel side coil as a reference, so as to control the first DC voltage to be constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification