Rotor assembly with balancing member
First Claim
1. A rotor assembly comprising a shaft carrying a rotor and a balancing member from which material is selectively removable, the balancing member being located in a predetermined position with respect to the rotor and comprising a main body from which material is selectively removable, a sleeve and an encoder member disposed on the sleeve so as to provide a separation between the main body and the encoder member in an axial direction of the shaft.
1 Assignment
0 Petitions
Accused Products
Abstract
A rotor assembly for an electronic machine such as a motor includes a rotor on a shaft having a bearing at each end portion, the bearings being arranged to rotatably support the rotor and shaft. The assembly further includes a balancing member, from which material may be removed for balancing the rotor assembly. The balancing member is located in a predetermined position and orientation with respect to the rotor. The balancing member includes an encoder disk, arranged to permit positioning of the rotor with respect to a stator. The provision of a balancing member having an integral encoder disk facilitates the manufacture of the rotor assembly. As the balancing member is located in a predetermined position, the encoder automatically assumes a predetermined position and hence the position of the rotor can be determined with certainty.
36 Citations
18 Claims
- 1. A rotor assembly comprising a shaft carrying a rotor and a balancing member from which material is selectively removable, the balancing member being located in a predetermined position with respect to the rotor and comprising a main body from which material is selectively removable, a sleeve and an encoder member disposed on the sleeve so as to provide a separation between the main body and the encoder member in an axial direction of the shaft.
- 12. A balancing member for a rotor assembly comprising a main body from which material is selectively removable, a sleeve, an encoder member formed integrally with the balancing member and disposed on the sleeve so as to provide a separation between the main body and the encoder member in an axial direction of the shaft, and a locating device arranged to locate the balancing member on a shaft in a predetermined position with respect to a rotor.
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14. A method of manufacture of a rotor assembly comprising:
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assembling a rotor on a shaft, introducing a balancing member onto the shaft, the balancing member comprising a main body, a sleeve and an encoder member disposed on the sleeve so as to provide a separation between the main body and the encoder member in an axial direction of the shaft and integrally formed with the balancing member onto the shaft, arranging the balancing member to occupy a predetermined position with respect to the rotor, and selectively removing material from the balancing member in order to balance the rotor assembly.
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Specification