Bench Mixer Triac Speed Control for Load-Dependent Torque Limits

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Solution Overview

Problem

Bench mixers face challenges in maintaining consistent speed and torque across various load conditions, leading to inefficiencies and potential gear damage, especially under heavy loads at low speed settings or high speed settings with normal loads.

Innovation Solution

A motor power control method using a Triac power limiting driving circuit with speed feedback, which adjusts power delivery by selectively switching the Triac at different phase angles or using Triac AC wave chop control to maintain target speed and prevent overheating, while also limiting torque and speed to prevent gear damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the bench mixer operates at low speed settings under heavy loads, then mixing capacity is improved, but motor overheating and gear damage risk increase

Engineering Contradiction:

Improvemixing capacityVSAvoidmotor and gear durability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The control system continuously monitors motor speed and load conditions, then adjusts power delivery in real-time. Speed feedback from the motor is compared against target speeds, and the Triac power controller modifies output accordingly to maintain operational parameters within safe limits while preserving mixing capacity.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically changes electrical parameters (power delivery, voltage, current) based on operating conditions. By adjusting the Triac firing angle and power limits according to speed settings and load detection, the system optimizes motor performance to prevent overheating and mechanical stress while maintaining effective mixing.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the bench mixer operates at high speed settings with normal loads, then mixing efficiency is improved, but gear damage risk increases due to excessive torque

Engineering Contradiction:

Improvemixing efficiencyVSAvoidgear durability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The control system monitors motor speed and applies power limits based on the selected speed setting. At high speeds, the system restricts maximum power delivery to prevent torque spikes that could damage gears, while still maintaining sufficient mixing efficiency through optimized power control.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically adjusts power delivery characteristics based on operating conditions. Power limits are automatically modified according to speed settings, creating a dynamic control strategy that prevents gear damage at high speeds while preserving mixing efficiency through real-time parameter optimization.

Inventive Principle:

Principle #15Dynamics

3Device complexity

If traditional speed control methods are used, then device simplicity is maintained, but consistent speed and torque control across various load conditions cannot be achieved

Engineering Contradiction:

Improvecontrol system simplicityVSAvoidspeed and torque consistency

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

Traditional mechanical speed control mechanisms are replaced with electronic control using Triac power switching and microprocessor-based control. This substitution enables precise speed and torque consistency across varying load conditions while maintaining relative system simplicity through integrated control circuitry and software algorithms.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This solution ensures consistent motor speed and torque across different load conditions, reduces the risk of gear damage, and extends motor running time by optimizing power delivery and temperature management.

Implementation Method 1

A motor power control method using a Triac power limiting driving circuit with speed feedback, which adjusts power delivery by selectively switching the Triac at different phase angles

Methodology Applied

Scientific EffectTriac phase angle switching:

Implementation Method 2

using Triac AC wave chop control to maintain target speed and prevent overheating

Methodology Applied

Scientific EffectAC wave chopping:

Implementation Method 3

A motor power control method using a Triac power limiting driving circuit with speed feedback

Methodology Applied

Scientific EffectSpeed feedback control: Feedback

Data Source

PatentUS10004359B2Bench mixer

Publication Date: 2018.06.26 BREVILLE HLDG PTY LTD

AI summary

A bench mixer has a combined whisk and scraper attachment. In preferred embodiments, the mixer has a processor configured to access data indicative of a respective power limit to be applied to a motor for each of a plurality of user selectable speed settings and monitors motor speed to compare against a user selected speed setting. The processor increases the power applied to the motor, up to a respective power limit if the current speed is lower than the user selected speed setting.