UK’s Leading Engineering Forum For Todays Engineer

Providing Regular Tips & Advice on Variable Speed Drives, Motors & Industry Related Topics

Sep
14
2017

What are the electrical characteristics of a motor?

Electrical characteristics of the motor// Electrical characteristics like voltage, frequency and phase of power supply should be consistent with the motor nameplate rating. A motor will operate satisfactorily on voltage within 10% of nameplate value, or frequency within 5%, with combined voltage and frequency variation not to exceed 10%. Voltage Common 60 hz voltages for …

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Sep
07
2017

How do direct-on-line (DOL) and star-delta motor starting compare?

Direct-on-line starting (DOL)// As the name suggests, direct-on-line starting means that the motor is started by connecting it directly to the supply at rated voltage. Direct-on-line starting, (DOL), is suitable for stable supplies and mechanically stiff and well-dimensioned shaft systems – and pumps qualify as examples of such systems. Line diagram for Direct-on-line motor starting Where: …

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Aug
31
2017

What information can be found on a motor nameplate?

Understanding motor’s nameplate A motor nameplate is normally located on all produced electric motors. Understanding nameplate information can sometimes be hard, but is essential. In most countries it is a requirement for manufacturers to display all information on the motor’s nameplate, but often this is not the case. However, when a motor has been in …

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Aug
17
2017

What are the basics of built-in motor protection?

Why is motor protection necessary? In order to avoid unexpected breakdowns, costly repairs and subsequent losses due to motor downtime, it is important that the motor is fitted with some sort of protective device. This article will deal with built-in motor protection with thermal overload protection to avoid damage and breakdown of the motor. The …

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Aug
10
2017

Which applications are best suited to variable speed drive control?

Energy saving & variable speed drives// Many industrial sectors have discovered the benefits of using variable speed drive (VSD) control in a wide variety of applications. Businesses in the commercial and public sectors can also utilise the benefits of VSDs, largely in applications involving pumps and fans, such as ventilation and air conditioning systems, combustion …

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Aug
09
2017

Quantum Golf Day 2017

Quantum’s annual seminar and golf day took place last month at Rockliffe Hall, Darlington and once again the turn out was brilliant – and the weather a significant improvement on 2016’s event! Our morning seminar covered the new ABB Ability™ Smart Sensor for motors, today’s drives and what they can do for your process, and …

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Aug
02
2017

What is the difference between switchgear and switchboard?

The application of switchgear and switchboards// One important element of good power system design is the proper selection of the distribution equipment. The choice of using either switchgear or switchboard must be based on many different criteria and the design of the power system requires thought to be given to each one. Following are insights …

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Jul
27
2017

What is motor torque and how does it work?

The rotating force that a motor develops is called torque. Due to the physical laws of inertia, where a body at rest tends to remain at rest, the amount of torque necessary to start a load (starting torque) is always much greater than the amount of torque required to maintain rotation of the load after it has achieved normal speed. …

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Jul
13
2017

What are the basic types of insulation resistance tests using the Megger tester?

Types of insulation resistance tests// You know that good insulation has high resistance and poor insulation relatively low resistance. The actual resistance values can be higher or lower, depending upon such factors as the temperature or moisture content of the insulation (resistance decreases in temperature or moisture). With a little record-keeping and common sense, however, …

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Jul
06
2017

How do motor speed control methods compare?

Why motor speed control? It is often desirable to control the motor speed, usually for process control reasons for variables such as flow or pressure. Applications such as fans and pumps often have varying output requirements, and control of the motor speed is more efficient than mechanically limiting the process output with devices such as …

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