Permanent Magnet DC Motors

We are Manufacturer, Supplier, Exporter Permanent Magnet DC Motors and our setup is situated in Pune, Maharashtra, India. Majorly we serve the customers from Delhi, Mumbai, Bangalore, Coimbatore, Hyderabad, Ahmedabad, Surat, Noida, Thane, Kolhapur, Rajkot, Hubli, Belgaum, Ambala, Chandigarh, Ludhiana, Shimla, Kolkata, Chennai, Nagpur. DC Motor is considered as an important component in area of research, industry and laboratory experiments because of its simplicity, low cost and efficiency. Any given piece of industrial equipment may have its speed change or adjusted mechanically by means of step pulley, sets of change gears, variable speed friction clutch mechanics and other mechanical devices.

The electrical speed control has much economical as well as engineering advantage over mechanical speed control. The speed of the motor can be controlled by three methods that are-
1. Terminal voltage control
2. Armature rheostat control method and
3. Flux control method.

Here in this paper, terminal voltage control method is employed. Here we are trying to control the speed and direction of permanent magnet DC motor using the interfacing devices.

Advantages

PMDC motor have some advantages over other types of DC motors. They are :

• No need of field excitation arrangement.
• No input power in consumed for excitation which improve efficiency of DC motor
• No field coil hence space for field coil is saved which reduces the overall size of the motor.
• Cheaper and economical for fractional kW rated applications

Disadvantages

• In this case, the armature reaction of DC motor cannot be compensated hence the magnetic strength of the field may get weak due to demagnetizing effect armature reaction.
• There is also a chance of getting the poles permanently demagnetized (partial) due to excessive armature current during starting, reversal and overloading condition of the motor.
• Another major disadvantage of PMDC motor is that, the field in the air gap is fixed and limited and it cannot be controlled externally. Therefore, very efficient speed control of DC motor in this type of motor is difficult.

Applications

PMDC motor is extensively used where small DC motors are required and also very effective control is not required, such as in automobiles starter, toys, wipers, washers, hot blowers, air conditioners, computer disc drives and in many more.