Motor driving control apparatus

A motor driving control apparatus comprising:

• exciting means for supplying current from a power source to a motor coil;
• first setting means for setting an exciting period to supply current from the power source to the motor coil by said exciting means;
• second setting means for setting a non-exciting period not to supply current from the power source to the motor coil by said exciting means;
• and
• PWM means for repeating alternately the current supply to the motor coil during the exciting period set by said first setting means, and the non-supply of current to the motor coil during the non-exciting period set by said second setting means, and
• said motor being driven by changing an exciting pattern of said exciting means,
• wherein said motor driving control apparatus further comprises
• third setting means for setting a short period to enable each of the feeding points of the motor coil to be short-circuited totally during said non-exciting period;
• fourth setting means for setting an open period to enable each of the feeding points of the motor coil to be totally in open status;
• fifth setting means for setting the value of current flowing in the motor;
• detecting means for detecting the motor current flowing in the motor;
• sixth setting means for setting the current target value to make the motor current a desired current value;
• comparing means for comparing the motor current detected by said detecting means, and the target value set by said sixth setting means;
• and
• controlling means for controlling the motor current set by said fifth setting means in accordance with the result of comparison of said comparing means,
• said fifth setting means being provided with changing means for changing the open period.

A motor driving control apparatus comprising:

• exciting means for supplying current from a power source to a motor coil;
• first setting means for setting an exciting period to supply current from the power source to the motor coil by said exciting means;
• second setting means for setting a non-exciting period not to supply current from the power source to the motor coil by said exciting means;
• and
• PWM means for repeating alternately the current supply to the motor coil during the exciting period set by said first setting means, and the non-supply of current to the motor coil during the non-exciting period set by said second setting means, and
• said motor being driven by changing an exciting pattern of said exciting means,
• wherein said motor driving control apparatus further comprises
• third setting means for setting a short period to enable each of the feeding points of the motor coil to be short-circuited totally during said non-exciting period;
• fourth setting means for setting an open period to enable each of the feeding points of the motor coil to be totally in open status;
• fifth setting means for setting the value of current flowing in the motor;
• detecting means for detecting the motor current flowing the motor;
• sixth setting means for setting the current target value to make the motor current a desired current value;
• comparing means for comparing the motor current detected by said detecting means, and the target value set by said sixth setting means;
• and
• controlling means for controlling the motor current set by said fifth setting means in accordance with the result of comparison of said comparing means,
• said fifth means being provided with first changing means for changing the open period,
• second changing means for changing the exciting period, and
• switching means for switching over said first changing means and said second changing means.

A motor driving control apparatus comprising:

• exciting means for supplying current from a power source to a motor coil;
• first setting means for setting an exciting period to supply current from the power source to the motor coil by said exciting means;
• second setting means for setting a non-exciting period not to supply current from the power source to the motor coil by said exciting means;
• and
• PWM means for repeating alternately the current supply to the motor coil during the exciting period set by said first setting means, and the non-supply of current to the motor coil during the non-exciting period set by said second setting means, and
• said motor being driven by changing an exciting pattern of said exciting means,
• wherein said motor driving control apparatus further comprises
• third setting means for setting a short period to enable each of the feeding points of the motor coil to be short-circuited totally during said non-exciting period;
• fourth setting means for setting an open period to enable each of the feeding points of the motor coil to be totally in open status;
• fifth setting means for setting the value of current flowing in the motor;
• detecting means for detecting the motor current flowing the motor;
• sixth setting means for setting the current target value to make the motor current a desired current value;
• comparing means for comparing the motor current detected by said detecting means, and the target value set by said sixth setting means;
• and
• controlling means for controlling the motor current set by said fifth setting means in accordance with the result of comparison of said comparing means,
• said fifth means being provided with first changing means for changing the open period,
• second changing means for changing a PWM period having said exciting period and said non-exciting period combined together, and
• switching means for switching over said first changing means and said second changing means.