ELECTRIC DRIVE INERTIA RATIO FOR TTT
First Claim
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1. A powertrain, comprising:
- an electric motor having an inertia; and
a driven member operatively coupled to the electric motor, the driven member having all inertia, the ratio of the motor inertia to the driven member inertia being within the range of about 1 to about 2.5.
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Accused Products
Abstract
An electric powertrain, a vehicle using an electric powertrain, and a method of manufacturing a vehicle having an electric powertrain are disclosed. The electric powertrain balances the ability of the vehicle to accept a given load, while at the same time affording the vehicle with an acceptable level of maneuverability. By selectively sizing the ratio of the inertia of the electric motor to the inertia of the vehicle, the optimum balance between these two competing concerns may be reached. Moreover, by optionally ensuring the Stemler Factor is less than or equal to the inertia ratio, the proper balance between load acceptance and maneuverability is attained as well.
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Citations
20 Claims
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1. A powertrain, comprising:
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an electric motor having an inertia; and a driven member operatively coupled to the electric motor, the driven member having all inertia, the ratio of the motor inertia to the driven member inertia being within the range of about 1 to about 2.5. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A track-type tractor, comprising:
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a main frame; an electric motor mounted to the main frame, the motor having a rotor, the rotor having a mass; a gear reduction assembly operatively coupled to the electric motor, the gear reduction assembly having an overall gear reduction ratio, the mass of the rotor multiplied by the square of the overall gear reduction ratio of the gear reduction assembly producing the inertia of the motor; and a track operatively coupled to the gear reduction assembly and having a rolling radius, the track-type tractor having a total mass, the total mass of the track-type tractor multiplied by the square of the rolling radius of the track producing an inertia of the tractor, the ratio of the inertia of the motor to the inertia of the tractor being with the range of about 1 to about 2.5. - View Dependent Claims (10, 11, 12, 13)
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14. A method of manufacturing a track-type tractor, comprising:
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operatively coupling an electric motor to a gear reduction assembly, the electric motor and gear reduction assembly having a motor inertia; operatively coupling the gear reduction assembly to a track of the track-type tractor, the track-type tractor having a tractor inertia; and sizing the electric motor relative to the track-type tractor such that the track-type tractor has a Stemler Factor less than the ratio of the motor inertia to the tractor inertia. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification