Synchronous Motor Gate Drive with Electromagnetic Braking
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Solution Overview
Problem
High-speed industrial lifting gates face risks of uncontrolled falling due to gravitational load and excessive wear on gears and brakes, particularly during power failures, as conventional asynchronous motor systems with mechanical brakes are inefficient and prone to failure.
Innovation Solution
A drive system utilizing a synchronous motor directly connected to the gate leaf, controlled to zero speed and powered by an electrical energy store, eliminating the need for counterweights and complex gear units, and enabling controlled braking and emergency operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional asynchronous motors with mechanical brakes are used, then the gate can be stopped and held in position, but the brakes are subject to high loads and excessive wear during power failures and emergency stops
Solution Approach 1:
The patent replaces the mechanical brake system with an electrical braking system using a synchronous motor. The motor provides electromagnetic braking force to stop and hold the gate leaf, eliminating the need for mechanical friction brakes. This substitution removes the wear and reliability issues associated with mechanical brakes while maintaining the ability to control the gate leaf position and stop it during power failures or emergency conditions.
Solution Approach 2:
The patent changes the operating parameters of the drive system by using a synchronous motor that can operate at zero speed with high torque output. This allows the motor to function both as a drive motor and as a brake, providing holding force without the need for separate mechanical braking components. The motor's ability to maintain torque at zero speed eliminates the high loads that would otherwise be imposed on mechanical brakes during emergency stops.
2Ease of operation
If mechanical brakes are used to hold the gate leaf, then the gate can be positioned, but the brakes require frequent maintenance and replacement due to wear
Solution Approach 1:
The patent eliminates mechanical brakes entirely by using a synchronous motor that provides electromagnetic holding force. This replacement removes the wear-prone mechanical components that require maintenance, while maintaining full capability for gate leaf positioning and holding. The motor's electromagnetic field provides continuous holding force without contact or wear, eliminating the need for brake maintenance and replacement.
3Force
If counterweights are used to balance the gate leaf weight, then the gravitational load is compensated, but the compensation cannot be maintained evenly over the service life due to changing spring characteristics
Solution Approach 1:
The patent replaces the mechanical counterweight and spring compensation system with an electrically controlled synchronous motor system. The motor directly compensates for the gravitational load through controlled electromagnetic force, eliminating the need for mechanical balance components whose characteristics change over time. This provides stable and reliable gravitational compensation throughout the entire service life of the gate system.
Solution Approach 2:
The patent changes from a passive mechanical balance system to an active electrical control system. The synchronous motor's electromagnetic parameters can be dynamically adjusted to maintain perfect balance compensation throughout the gate's operation and over its entire service life, unlike mechanical springs whose characteristics degrade and change over time.
4Productivity
If high closing speeds of up to 4 m/s are achieved, then the gate operation efficiency is improved, but the kinetic energy and loads on mechanical components increase as a quadratic function of speed
Solution Approach 1:
The patent replaces the mechanical brake system that would have to absorb the quadratic increase in kinetic energy at high speeds with an electrical braking system. The synchronous motor provides electromagnetic braking force that can be precisely controlled to decelerate the gate leaf from high speeds without imposing excessive loads on mechanical components. This substitution allows high closing speeds to be achieved while maintaining manageable stress levels on the drive 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
Reduces the risk of falling and mechanical wear, enhances safety by ensuring controlled braking and energy-efficient operation, even during power failures, and eliminates the need for frequent brake maintenance.
Implementation Method 1
a drive motor (3) that can be coupled directly, in particular without a gear, to the door leaf (2) and is set up to move the door leaf (2) vertically
Implementation Method 2
an electrical energy store (7) that can supply the drive motor (3) and the control device (6) with electrical energy in the event of a power failure
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention provides a drive unit for high-speed overhead gates, in which a drive motor, whose speed can be reduced to zero, is provided for moving the gate leaf. The drive motor is controlled by a control unit. When an emergency stop condition occurs, the drive motor is controlled so that its speed is reduced to zero in a controlled manner, thus braking the gate leaf. When the gate leaf has come to a standstill, it is held in the stopping position by the drive motor, which is energized at zero speed. An emergency power supply ensures that motorized braking of the gate leaf and emergency opening are possible even in the event of a power failure.