What will happen if the series field of a cumulative compound motor is short circuited?
What will happen if the series field of a cumulative compound motor is short circuited?
Hence, applications with low starting torque are called in differentially compound DC motor. 2. Which DC motor is more preferred for elevators? Explanation: Cumulative wound DC motors give high starting torque like a series motor and reasonable good speed regulation at high speeds like a shunt dc motor.
What is PMDC motor?
A Permanent Magnet DC motor (PMDC motor) is a type of DC motor that uses a permanent magnet to create the magnetic field required for the operation of a DC motor. Have you ever used a battery operated toy? The motor that drives these toys is nothing but a permanent magnet DC motor or PMDC motor.
How do DC motors prevent short circuits?
5 Ways to Prevent Short Circuits
- Check Outlets Before Use. Behind every outlet is a box with attached wires.
- Check Appliances Before Use.
- Reduce Electrical Usage During Storms.
- Perform Basic Circuit Breaker Maintenance.
- Schedule an Electrical Inspection at Least Once a Year.
What will happen if shunt field resistance is too large?
Answer: n d.c shunt motor if field winding supply is removed the motor back emf will drop to zero, hence the armature will draw more current to make up the emf. this results in blowing up of fuse.
What will happen if the field circuit is opened during experiment?
As mentioned above if the field circuit is opened, the back emf will drop to zero. With full armature voltage applied this will cause a very large armature current to flow which should normally blow the fuses. While the field current decays the motor will speed up as if in a field weakening mode.
Why speed decreases as load increases in cumulative compound motor?
In the cumulative compound motor, the field produced by the series winding aids the field produced by the shunt winding. The speed of this motor falls more rapidly with increasing current than does that of the shunt motor because the field increases. The field flux, therefore, decreases with increasing load current.