Electric Motor Braking via Winding Resistance Control
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Solution Overview
Problem
Existing assemblies with movable parts driven by electric motors face challenges in safely braking the movement when the motor loses power, particularly during transport, as traditional braking methods like manual or electrical locks increase cost and weight, and existing motor-based braking methods require additional components and complex control.
Innovation Solution
The solution involves using the electric motor itself to provide resistance by disconnecting the galvanic connection and applying a predetermined resistance between the motor windings, allowing the motor to brake the movable part, with multiple motors being controlled to prevent undesired movements and protect against impacts by adapting resistance based on motor type and movement velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional braking means such as manual or electrical locks are used, then the movable part can be braked when the motor loses power, but the cost and weight of the assembly increase
Solution Approach 1:
The motor is made multi-functional by enabling it to perform both its primary function of driving the movable part and its secondary function of braking the movable part when power is lost. The controller achieves this by detecting motor power status and automatically switching between drive mode and brake mode, eliminating the need for separate braking components.
Solution Approach 2:
The motor serves itself by using its own electromagnetic structure to generate braking force when power is interrupted. The controller detects the power loss and reconfigures the motor winding connections to create electromagnetic resistance that automatically brakes the movable part without requiring external braking systems.
2Reliability
If additional braking means such as manual or electrical locks are used, then the movable part can be braked when the motor loses power, but the cost of the assembly increases
Solution Approach 1:
The motor is made multi-functional by enabling it to perform both its primary function of driving the movable part and its secondary function of braking the movable part when power is lost. The controller achieves this by detecting motor power status and automatically switching between drive mode and brake mode, eliminating the need for separate braking components.
Solution Approach 2:
The motor serves itself by using its own electromagnetic structure to generate braking force when power is interrupted. The controller detects the power loss and reconfigures the motor winding connections to create electromagnetic resistance that automatically brakes the movable part without requiring external braking systems.
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 approach effectively brakes the movable part without additional weight or cost, ensuring safe movement and protection during power loss, allowing for efficient and controlled movement when power is restored, and preventing damage from undesired positions or impacts.
Implementation Method 1
a first braking element... adapted to determine whether power and/or signals are provided to a first motor... by applying a predetermined resistance between inputs of a coil of the first motor... so that rotation of a motor shaft will meet a rotation resistance
Data Source
Figure 1~2
AI summary
An assembly comprising a movable element being movable in relation to a base, a first electric motor for moving the element in relation to the base, the motor having one or more first windings each having at least two inputs, a first braking element being adapted to determine whether power and/or signals are provided to the first motor and being adapted to alter between at least two modes wherein, in a first of the modes, no power/signals is/are provided to the first motor and a first galvanic connection is provided between the inputs of at least one of the first windings and a first element having a predetermined resistance and wherein in a second of the modes, power/signals is/are provided to the first motor and the first galvanic connection is disconnected.