Solution for balancing loads between motors in a synchronous system

Solution for balancing loads between motors in a synchronous system

1. Make a problem

• For loads with rigidly connected or interlinked motors, the motors have different load-bearing levels during operation.
• In practice we encounter a lot of single-load drive systems pulled by multiple motors. At this time, the load balancing between the motors is necessary to avoid having the motor run overloaded, the motor running under load causing damage to the mechanical structure and not ensuring the control requirements.

2. Solution

• Use the magnetic starter to close the motors at the same time.
• Use one inverter to start multiple motors.
• Use load balancing.
• Use torque control mode.

2.1 Using magnetic starter to start motors at the same time

• With this system has the advantages of simplicity, low cost, easy repair and installation.
• However, the starting current will be high, easily causing mechanical damage due to load shock.
• This system does not regulate engine speed.

2.2 Using one inverter to start multiple motors

• In this system the motors must be the same.
• The inverter can only operate in V/F mode at this time.
• The inverter will not protect the motor.
• All engines are started and stopped at the same time.

2.3 Using a load balancing solution

• Droop control solution automatically balances the load between 2 motors driving the same load, the inverter in Droop control mode automatically transfers the load from motor A to motor B or vice versa by changing the frequency of the inverter. when the torque value changes unbalanced.
• Simple control system.

2.4 Using torque control mode

• Precise load balancing, working over a wide speed range.
• Control the speed limit when the motor is unloaded.
• The control system is more complex, there is a link between two inverters.
• The selected inverter must have torque control function.

3. Contact Solution for balancing loads between motors in a synchronous system

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