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DC Drive

DC Drive
DC Drive
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Product Code : PA-23
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Product Description
We are the recognized team of experts that is engaged in providing the high-grade of DC Drive that is made up of premium quality components, with the outstanding performance and durability. It is perfectly designed under the supervision of our diligent professionals that offers unmatched processing speed, which results in the optimum performance. Our DC Drive is widely used in the metal industry, crane industry, mining, and printing industry to fulfill the exact needs of a customer.

The current trend is to replace DC systems with new AC drives and motors to reduce maintenance overheads, however, this can often be a significant task that requires the machinery to be taken out of service for an extended period while mechanical and electrical rework is undertaken.

Utilizing the existing DC motor and upgrading the DC drive is often the most attractive option. DC motors are usually well built and capable of offering many more years of service, the project costs are usually much lower and the disruption and risks are minimized. Modern DC drives also provide many benefits,

Controlling a DC Motor:
A thyristor bridge is a technique commonly used to control the speed of a DC motor by varying the DC voltage. Examples of how a DC rectifier bridge operates are given on the next few pages. Voltage values given in these examples are used for explanation only. The actual values for a given load, speed, and motor vary.

It is important to note that the voltage applied to a DC motor be no greater than the rated nameplate. Armature windings are commonly wound to 500 VDC. The control logic in the drive must be adjusted to limit available DC voltage to 0 – 500 VDC. Likewise, the shunt field must be limited to the motor’s nameplate value.

Basic Operation:
A DC drives supplies voltage to the motor to operate at the desired speed. The motor draws current from this power source in proportion to the torque (load) applied to the motor shaft.

100% Speed, 0% Load:
In this example, an unloaded motor connected to a DC drive is being operated at 100% speed. The amount of armature current (Ia) and unloaded motor needs to operate is negligible. For the purpose of explanation, a value of 0 amps is used.

The DC drive will supply only the voltage required to operate the motor at 100% speed. We have already learned the amount of voltage is controlled by the gating angle (COSα) of the thyristors. In this example 450 VDC is sufficient. The motor accelerates until CEMF reaches a value of Va – IaRa.
Remember that Va = IaRa + CEMF. In this example IaRa is 0, therefore CEMF will be approximately 450 VDC.

100% Speed, 100% Load:
A fully loaded motor requires 100% of rated armature current at 100% speed. Current flowing through the armature circuit will cause a voltage drop across the armature resistance (Ra). Full voltage (500 VDC) must be applied to a fully loaded motor to operate at 100% speed. To accomplish this, thyristors are gated earlier in the sine wave (36.37°).

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