Cooling of motor spindles—a review

Denkena, Berend; Bergmann, Benjamin; Klemme, Heinrich

doi:10.1007/s00170-020-06069-0

“…In experimenting, we changed the coolant flux and working temperature by adjusting oil cooler (7), and the ambient temperature, shaft speed and oil/air flow rate for lubrication were regulated through the air conditioner, variable-frequency drive (6) and oil-air lubrication device (4) respectively. In order to monitor the spindle temperature change under different cooling parameters, 8 thermal resistance temperature sensors (12)(13)(14)(15)(16)(17)(18)(19) were evenly placed on the outer surface of spindle cooling sleeve and 2 built-in thermistors (10)(11) on the outer rings of front and rear spindle bearings as well. At the same time, the thermal resistances ( 8) and ( 9) are used to measure the temperature of discharged oil-air and coolant separately.…”

Section: Experiments Setupmentioning

confidence: 99%

“…Further, cooling, as an efficient way to lower the temperature, is usually needed in two locations: bearings and motor for a high-speed motorized spindle [10]. The cooling for bearings is often accompanied by lubrication, whose corresponding impact on spindle temperature has been investigated by many scholars, such as Michael et al [11].…”

Section: Introductionmentioning

confidence: 99%

“…Here are some passive/active ways to cool electric motors, for example the forced/free air cooling, the liquid cooling by oil/water, the loop thermosyphon, the evaporative cooling using liquid boiling, the additional circuit for enhanced heat transfer, etc. [10,[12][13], among which the air cooling is more suitable for small power motors and the evaporative cooling is mainly employed in super high-power applications. From the complexity of cooling units, the forced air and liquid cooling are more practical than other cooling approaches in engineering.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of a cooling unit on high-speed motorized spindle temperature with a scaling factor

Zheng

¹

,

Chen

²

2022

Int J Adv Manuf Technol

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Forced cooling, as an efficient way of heat dissipation, significantly affects the spindle temperature. Although a full cooling passage was factored into the finite element analyses by some scholars, often only the model for the front or rear half of a spindle is need for the purpose of the thermal evaluation simplification and data overhead reduction in engineering applications. So far, how the coolant passage affects the heat dissipation of the front or rear half of a spindle has not been well characterized. This paper devotes to constructing a scaling factor to represent the coolant unit effect on the thermal growth of spindles. The experiments about the effect of coolant units on spindle temperature were first implemented, and then the qualitative conclusions were got with various coolant parameter settings. To further quantify these influences, the regressive analysis was carried out. As a result, the peak temperature area was found and the scaling factors were proposed to describe the effect of the cooling system on the front or rear half of spindle temperature. In this process, the thermal equivalent convection for coolant passage was modeled based on the thermal resistance theory. In the meantime, we planned a novel thermal network of a motored spindle for contrast and validation, in which the cooling mechanism was integrated, and the structural constraints were considered by the aid of the proposed scaling factors. The result is indicative of a better agreement with real values when employing the proposed model.

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“…In experimenting, we changed the coolant flux and working temperature by adjusting oil cooler (7), and the ambient temperature, shaft speed and oil/air flow rate for lubrication were regulated through the air conditioner, variable-frequency drive (6) and oil-air lubrication device (4) respectively. In order to monitor the spindle temperature change under different cooling parameters, 8 thermal resistance temperature sensors (12)(13)(14)(15)(16)(17)(18)(19) were evenly placed on the outer surface of spindle cooling sleeve and 2 built-in thermistors (10)(11) on the outer rings of front and rear spindle bearings as well. At the same time, the thermal resistances (8) and ( 9) are used to measure the temperature of discharged oil-air and coolant separately.…”

Section: Experiments Setupmentioning

confidence: 99%

“…Further, cooling, as an efficient way to lower the temperature, is usually needed in two locations: bearings and motor for a high-speed motorized spindle [10]. The cooling for bearings is often accompanied by lubrication, whose corresponding impact on spindle temperature has been investigated by many scholars, such as Michael et al [11].…”

Section: Introductionmentioning

confidence: 99%

Effect of a Cooling Unit on High-speed Motorized Spindle Temperature With a Scaling Factor

Zheng¹,

Chen²

2021

Preprint

0

View full text Add to dashboard Cite

Forced cooling, as an efficient way of heat dissipation, significantly affects the spindle temperature. Although a full cooling passage was factored into the finite element analyses by some scholars, often only the model for the front or rear half of a spindle is need for the purpose of the thermal evaluation simplification and data overhead reduction in engineering applications. So far, how the coolant passage affects the heat dissipation of the front or rear half of a spindle has not been well characterized. This paper devotes to constructing a scaling factor to represent the coolant unit effect on the thermal growth of spindles. The experiments about the effect of coolant units on spindle temperature were first implemented, and then the qualitative conclusions were got with various coolant parameter settings. To further quantify these influences, the regressive analysis was carried out. As a result, the peak temperature area was found and the scaling factors were proposed to describe the effect of the cooling system on the front or rear half of spindle temperature. In this process, the thermal equivalent convection for coolant passage was modeled based on the thermal resistance theory. In the meantime, we planned a novel thermal network of a motored spindle for contrast and validation, in which the cooling mechanism was integrated, and the structural constraints were considered by the aid of the proposed scaling factors. The result is indicative of a better agreement with real values when employing the proposed model.

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A review on epoxy granite reinforced polymer composites in machine tool structures – Static, dynamic and thermal characteristics

Mula

¹

,

ArunRamnath

²

,

Ramasamy

³

2023

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Machine tool structures produced with Epoxy Granite reinforced polymer composites (EGPCs) have gained prominence in recent years and have replaced conventional cast iron materials and other metals due to its remarkable damping characteristics. However, machine tool structures manufactured with EGPCs tends to exhibit limited strength, stiffness and stability. Such challenges in EGPCs are resolved by incorporation of steel as additional reinforcement and enhanced mechanical properties are observed in these hybrid machine‐tool structures. Hybrid epoxy granite machine tool structures with enhanced mechanical performance are prone to thermal errors resulting in machining inaccuracies and limited performance. Thermal errors induced in machine tool structures could be attributed due to effect of temperature distribution and displacements at the Tool Center Point (TCP). This review work carried out focuses predominantly on design methods adopted in resolving the challenges identified in development of machine tool structures and further analyses results of several polymer concrete‐based machine tool structures with regard to static, dynamic and thermal characteristics. Several review works conducted earlier have discussed the results of static and dynamic characteristics, whereas this review work provides additional information on thermal based errors induced and discusses the methods adopted in compensation of thermal errors. In this review paper, research studies pertaining to static and dynamic characteristics of different machine tool structures performed in last three decades have been discussed and a wholistic information is provided in relation with static, dynamic and thermal characteristics and properties toward developing a machine tool structure with a novel, newer class or alternative materials.

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Cooling of motor spindles—a review

Cited by 30 publications

References 111 publications

Effect of a cooling unit on high-speed motorized spindle temperature with a scaling factor

Effect of a cooling unit on high-speed motorized spindle temperature with a scaling factor

Effect of a Cooling Unit on High-speed Motorized Spindle Temperature With a Scaling Factor

A review on epoxy granite reinforced polymer composites in machine tool structures – Static, dynamic and thermal characteristics

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