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Lecture

Components: Ball-bearings (continued), Actuators

In course

EE-580: Introduction to the design of space mechanisms

Space environment is different from what we can experience on Earth, requiring specific design approaches in order to achieve reliable operations. Engineers must hence face new challenges stimulating their creativity to tackle those particular constraints. ...

Description

This lecture covers the thermal conductivity, torque noise, and lubrication of ball bearings, as well as the working principles and classification of electrical motors and actuators. It delves into the materials, Lundberg-Palmgren life evaluation, assembly, preload, and torque noise of ball bearings. The lecture also discusses the various types of components, including mechanical and electrical components, according to ECSS-Q-ST-60C Rev.2 and ECSS-Q-ST-60-13C. Furthermore, it explores the force generation mechanisms of motors and actuators, such as electromagnetic, brushed, reluctance, and brushless motors, as well as other actuator principles like paraffin, shape memory alloys, and piezo-electric actuators.

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Electrical engineering

Electronic engineering: Power electronics

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Biophysics: Biomechanics

Related concepts (32)

Electric motor

An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. An electric generator is mechanically identical to an electric motor, but operates with a reversed flow of power, converting mechanical energy into electrical energy.

Rolling-element bearing

In mechanical engineering, a rolling-element bearing, also known as a rolling bearing, is a bearing which carries a load by placing rolling elements (such as balls or rollers) between two concentric, grooved rings called races. The relative motion of the races causes the rolling elements to roll with very little rolling resistance and with little sliding. One of the earliest and best-known rolling-element bearings are sets of logs laid on the ground with a large stone block on top.

Bearing (mechanical)

A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts. The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts. Most bearings facilitate the desired motion by minimizing friction.

Brushless DC electric motor

A brushless DC electric motor (BLDC), also known as an electronically commutated motor, is a synchronous motor using a direct current (DC) electric power supply. It uses an electronic controller to switch DC currents to the motor windings producing magnetic fields that effectively rotate in space and which the permanent magnet rotor follows. The controller adjusts the phase and amplitude of the DC current pulses to control the speed and torque of the motor.

AC motor

An AC motor is an electric motor driven by an alternating current (AC). The AC motor commonly consists of two basic parts, an outside stator having coils supplied with alternating current to produce a rotating magnetic field, and an inside rotor attached to the output shaft producing a second rotating magnetic field. The rotor magnetic field may be produced by permanent magnets, reluctance saliency, or DC or AC electrical windings.

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