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Motor speed control circuit

A speed control, speed voltage technology, applied in the direction of DC motor speed/torque control, single-phase motor control, AC motor control, etc., to achieve the effect of improving accuracy

Inactive Publication Date: 2007-03-07
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, based on the logic shown in FIG. 11 , although the motor drive circuit 11 has received the command to run the motor 1 at full speed, it has a defect that it operates in the direction of stopping the motor 1.

Method used

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Embodiment Construction

[0027]

[0028] Referring to FIGS. 2 to 9 as appropriate, a configuration example of the motor speed control system of the present invention will be described based on FIG. 1 .

[0029] The motor speed control system shown in FIG. 1 includes: a motor 100 to be controlled, a motor driver IC 200 ("first circuit" of the present invention), and a motor speed control IC 300 ("second circuit" of the present invention). That is, the "motor speed control circuit" of the present invention is a case of a two-chip structure in which the motor driver IC 200 and the motor speed control IC 300 are respectively integrated on one chip. In addition, the "motor speed control circuit" of the present invention may be a case where the motor driver IC 200 and the motor speed control IC 300 are integrated on one chip.

[0030] The motor 100 is a so-called single-phase motor having a single-phase drive coil, and a so-called Hall motor in which a Hall element 110 is fixed to a stator. In addition, ...

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Abstract

The invention provides a motor speed control circuit which improves the speed control precision of the motor. A motor speed control circuit that controls the rotational speed of the motor by controlling the amount of current flowing through the drive coil of the motor includes a reference voltage circuit to which a speed command signal for commanding the rotational speed of the motor is input, and based on the speed command a signal generating reference voltage; a speed voltage circuit that generates a speed voltage corresponding to the actual rotational speed of the motor; a clamp circuit that limits the level of the speed voltage generated in the speed voltage circuit; a comparison circuit that is applied to the reference voltage generated in the reference voltage circuit and the speed voltage whose level is limited in the clamp circuit, and compare the two; and a control signal generation circuit based on the comparison circuit As a result of the comparison, a control signal for controlling the amount of current flowing in the drive coil is generated and output.

Description

technical field [0001] The present invention relates to motor speed control circuits. Background technique [0002] Various electronic devices have a heat generating body that generates heat when the electronic device is in operation, and a fan motor is generally provided to cool the heat generating body. For example, in personal computers, servers, etc., the operating frequency of the CPU is increasing year by year, and the amount of heat generated by the CPU is increasing accordingly. Therefore, in a personal computer, a server, or the like, a fan motor for cooling the CPU and a motor drive circuit for driving the fan motor are generally provided. [0003] In addition, as a speed control method of the fan motor, for example, a speed servo control method combined with a PWM drive method as shown in FIG. 10 has been proposed (see, for example, Patent Document 1 below). [0004] More specifically, the rotational speed detection signal obtained from the pulse generator PG of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P23/14H02P27/00H02P6/06H02P6/08H02P6/17H02P6/26
CPCH02P7/2913H02P7/282H02P6/06
Inventor 扇野广一郎原岛崇
Owner SANYO ELECTRIC CO LTD
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