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Rotary actuator

A rotor and stator technology, applied in the field of actuators, can solve problems such as difficult to build stacks

Active Publication Date: 2019-03-15
GENESIS ROBOTICS & MOTION TECH CANADA ULC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The challenge is that high pole count axial motors have a very thin profile (if the torque-to-weight ratio potential is to be exploited) making it difficult to build the stack

Method used

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Embodiment Construction

[0015] A rotary actuator is disclosed that uses a dual rotor configuration with a stator positioned between the two rotors. The advantage of this configuration is that the magnetic force on the stator is always reasonably equal in both axial directions of each post. This reduces the load on each post and reduces the stress on each glue line in the stator assembly. The tangential forces on each column can also be very high at full power, but these forces are also balanced on each column so that the glue line is not under great stress at any time.

[0016] In this configuration with high structural strength and stiffness, and high thermal conductivity, it is desirable to use a "back iron" that does not actually become part of the flux path like a conventional single stator. Aluminum would be an excellent choice in terms of high strength to weight ratio and high thermal conductivity, but aluminum also has high electrical conductivity and therefore high eddy currents, especially ...

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Abstract

An actuator for high rotational speed applications using a stator which utilizes laminated features to reduce Eddy current losses in the stator. This construction allows high pole counts while providing the efficiency and high speed benefits of a laminated construction. Laminated construction is very challenging for a high pole count lightweight motor, but embodiments of the device provide structural strength, and rigidity, as well as other benefits such as low manufacturing cost, high heat dissipation, integrated cooling channels, and light weight construction. Many of these benefits result from the use of a laminate sandwich of non-magnetic, heat conductive material, such as anodized aluminum, as a structural member of the stator.

Description

technical field [0001] The present invention relates to actuators. Background technique [0002] High pole count motors offer many advantages such as high torque and light weight potential. WIPO published patent application WO2017024409A1 shows that solid stators can provide sufficient performance in minimizing eddy currents at relatively low speeds, such as when used in robotics. For high speed applications, lamination is preferred to reduce eddy current losses. The challenge is that high pole count axial motors have a very thin profile (if the torque-to-weight potential is to be exploited), making it difficult to build the stack. For example, if a single-rotor and single-stator configuration is used, the force pulling the stator and rotor together across the air gap is expected to shear the glue lines holding the laminate structure together so that the air gap is maintained. Contents of the invention [0003] Rotary actuators solve this problem in a number of ways inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/16H02K16/00H02K7/08
CPCH02K1/146H02K1/20H02K7/088H02K16/02H02K21/24H02K2201/03
Inventor 詹姆斯·B·克拉森布兰得利·克里斯多夫·蒲柏
Owner GENESIS ROBOTICS & MOTION TECH CANADA ULC