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# DC Motor Control Method Considering Overheat Protection and Performance

IP.com Disclosure Number: IPCOM000103725D
Original Publication Date: 1993-Jan-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 2 page(s) / 79K

IBM

## Related People

Kamijoh, T: AUTHOR [+2]

## Abstract

Disclosed is a new DC motor control method considering overheat protection and minimization of down performance. By adopting a new method, controlled root mean square current of motor coil protects the motor coil from overheating and can minimize down performance.

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DC Motor Control Method Considering Overheat Protection and Performance

Disclosed is a new DC motor control method considering
overheat protection and minimization of down performance.  By
adopting a new method, controlled root mean square current of motor
coil protects the motor coil from overheating and can minimize down
performance.

A program decides the basic motion of the DC motor before the
motor starts to rotate.  The basic motion is divided into
acceleration/degree ration period, fixed speed period, and stop
period from a motor's standpoint.  Then, a program calculates root
mean square current considering the above basic motion for the next
movement and in the previous fixed period.

Next, a program compares the result to a standard and puts in a
wait as necessary.  The standard is a value that permitted maximum
root mean square current in continuous motor movement without wait
insertion.  When there is no motion period or wait insertion, a
program calculates as the same.

By properly setting a standard and wait time, a program is
surely able to protect motor coil from overheating.  The flow chart
of the new method is shown in Fig. 1.  To calculate root mean square
current I, a program uses parameters shown in Fig. 2.  T0, T3, I1,
I2, I3 are constants obtained by measurement, and a program has T1
and T2 as constant values according to fixed speed in the table.

To avoid down performance by calculation, a program calculates
IxI using the following expression.  In this expression, the initial
value of I0 is 0, and in t...